Patent Publication Number: US-2005129725-A1

Title: Method of controlling pest and pest control agent

Description:
TECHNICAL FIELD  
      The present invention relates to a method of controlling pests, which comprises filling a space where the presence of pests is not intended with a vapor of a compound having the following formula (I):  
                 
 
 wherein  
                 
 
 is a single bond or a double bond, at a particular concentration for a long time, thereby creating an environment pests do not like, which presses the pests to leave the space and simultaneously prevents new invasion, an apparatus to be used therefor, and a pest control agent containing the compound. 
 
     BACKGROUND ART  
      Pests are well known to cause damage to agricultural products, give uncomfortable feeling and blood-sucking damage to human, mediate severe diseases such as Japanese B encephalitis, malaria, dysentery, plague and the like, and mediate diseases in livestock. Recent increase in the amount of food import and globalization of plane passengers have increased the danger of pest invasion. Combined with the global warming and higher average temperature in houses, it is considered that the pests can pass the winter. Furthermore, the possibility is becoming higher that pests of agricultural products specific to a particular area are transmitted to different areas, and that tropical pests such as malaria mosquitoes, West Nile fever mosquitoes etc. come on shore of temperate regions. In regards to the pests of domestic species, moreover, the ability to naturally balance the numbers of individual pests by food chain in nature has been lost due to the conventional pesticided control, and as the trend in these days towards low levels of pesticides used and no pesticide prevails into the field of insect repellents for home use, excessive breeding has become unrestrainable, and there is a high possibility that pests may be infested heavily. It has been predicted that pests of alien species once landed will increase explosively in a short time and damage human, livestock and agricultural products due to the natural enemy-free environment and their high fecundity, and measures to deal with such situation are desired.  
      Conventionally, agents having an insecticidal effect, such as organophosphates, carbamates and the like, have been widely used as pest control agents. However, these are associated with the problem of damage to human and livestock. While a number of low toxic pyrethroid agents have appeared in recent years, as long as their effectiveness expression mechanism is based on the biocidal activity, concerns about the health of human and livestock as well as influence on the environment cannot be eliminated.  
      On the other hand, pest control agents based not on insecticidal activity but on repellent effect are known. Repellents free of biocidal activity are expected to simultaneously provide high safety and pest controllability. As a conventional agent exhibiting a repelling action against broad kinds of pests such as mosquitoes, ants, horseflys, cockroaches and the like, DEET (N,N-diethyl-m-tolamide) is known. However, since DEET is volatilized in the air in a comparatively short time, it is difficult to maintain its repellent effect for a long time. While terpenoid compounds such as menthol, p-menthane-3,8-diol and the like are known to have a repellent effect against mosquitoes and terpenoid compounds such as linalool, geraniol and the like are known to have a repellent effect against cockroaches, they do not necessarily retain practical effectiveness from the aspects of “long effective period” and “effectiveness with a small amount” [See Masato NOMURA et al., Nippon Nôgeikagaku kaishi vol. 67, pp. 693-700 (1993).].  
      The present inventors have found that a compound having the following structure  
                 
 
 has Acarina repellency and proposed an Acarina control agent containing this compound (see JP-A-10-316507.). This Acarina control agent has more advantages as compared to conventionally known organophosphate-, pyrethroid- and carbamate-type and other types of acaricides in that (1) it has lower acaricidal activity, and Acarina can be removed without leaving Acarina cadaver, which is a potent allergen, in the environment, (2) Acarina do not acquire resistance easily, (3) it is highly safe to human and livestock, and the like. 
 
      The above-mentioned publication discloses that farnesylacetone can be used for controlling Acarina. However, it does not disclose that the Acarina control agent can be used for repellence of pests other than Acarina and that a particularly remarkable repellent effect can be obtained by maintaining farnesylacetone in an effective concentration range in a space where the presence of pests is not desired.  
     DISCLOSURE OF THE INVENTION  
      The present inventors have conducted intensive studies and found that pests other than Acarina can be particularly effectively controlled by allowing gaseous farnesylacetone to be present at a particular concentration of 0.001-20,000 μg/L in a space where pest repellence is intended, further that such effect can be achieved when not only farnesylacetone but also a compound having the formula (I)  
                 
 
 wherein  
                 
 
 is a single bond or a double bond, (hereinafter to be also referred to as compound (I)) is used, and that sustention of the action for a long time can be achieved by continuous vaporization of an agent comprising compound (I) (e.g., liquid compound (I) or a diluent thereof) by a vaporization enhancing means, which resulted in the completion of the present invention. 
 
      Accordingly, the present invention provides a method of effectively controlling pests, which comprises maintaining the concentration of compound (I) within a repellence effective concentration range for a long time in a space where pest repellence is intended, a method and an apparatus for efficiently achieving such effective concentration, and a pest control agent containing compound (I) as an active ingredient. Thus, the present invention provides the following.  
      [1] A method of controlling a pest, which comprises maintaining a gaseous compound having the formula (I)  
                 
 
 wherein  
                 
 
 is a single bond or a double bond, at a concentration of 0.001-20,000 μg/L in a space where pest repellence is intended. 
 
      [2] The method of the above-mentioned [1], wherein the aforementioned concentration is achieved by vaporizing a compound having the formula (I) by a vaporization enhancing means.  
      [3] The method of the above-mentioned [1] or [2], wherein the aforementioned concentration is achieved by vaporizing a compound having the formula (I) by a vaporization area expanding means.  
      [4] The method of the above-mentioned [2] or [3], wherein the vaporization enhancing means is a heating means.  
      [5] The method of the above-mentioned [2] or [3], wherein the vaporization enhancing means is an air blowing means.  
      [6] An apparatus for controlling a pest, which comprises a reservoir means for an agent containing a compound having the following formula (I)  
                 
 
 wherein  
                 
 
 is a single bond or a double bond, and a means for enhancing vaporization of the compound having the formula (I). 
 
      [7] The apparatus of the above-mentioned [6], further comprising a vaporization area expanding means for the compound having the formula (I).  
      [8] The apparatus of the above-mentioned [6] or [7], wherein the vaporization enhancing means is a heating means.  
      [9] The apparatus of the above-mentioned [6] or [7], wherein the vaporization enhancing means is an air blowing means.  
      [10] A pest control agent comprising a compound having the following formula (I)  
                 
 
 wherein  
                 
 
 is a single bond or a double bond, as an active ingredient.
 
    
    
     DETAILED DESCRIPTION OF THE INVENTION  
      The compound (I) is a known compound and is chemically synthesized at a large scale as a starting material for synthesizing, for example, a side chain of vitamin E and vitamin K 2 . When  
                 
 
 is a double bond, compound (I) includes plural kinds of geometrical isomers based on different connection sites to the double bond (cis, trans). The compound (I) to be used for the present invention may be any of these geometrical isomers, or a mixture of two or more kinds of these geometrical isomers, where the mixing ratio is not particularly limited. 
 
      The “gaseous” of the gaseous compound (I) of the present invention includes a mist state depending on the vaporization conditions, surrounding environmental conditions, and the like.  
      The concentration of gaseous compound (I) in a space where pest repellence is intended is at least not less than 0.001 μg/L, preferably not less than 0.01 μg/L and not more than 20,000 μg/L at most, preferably not more than 2,000 μg/L. When the concentration is less than 0.001 μg/L, a pest controlling effect is not found and when it exceeds 20,000 μg/L, the odor compound (I) generates becomes unpleasantly strong and is not practical.  
      The space where pest repellence is intended is free of any particular limitation as regards size, shape and the like, because the amount of use and method of use of compound (I) can be adjusted so that the above-mentioned concentration can be achieved.  
      The agent comprising compound (I) in the context of the present specification refers to a single compound of compound (I) and a dilute solution obtained by diluting compound (I) with a diluent, or one containing other carriers, including not only a liquid but a solid. As the diluent, any inorganic or organic diluent can be used as long as it does not exert an adverse influence on compound (I). As the diluent, a solvent, an aroma retention agent, a moisturizer and the like can be used. Of these, those having high safety, which are used as starting materials for cosmetics, are preferable, and, for example, alcohols such as ethyl alcohol, isopropyl alcohol and the like, ketones such as acetone and the like, esters (low boiling point) such as ethyl acetate and the like; silicone oil, polyethylene glycol, polypropylene glycol, jojoba oil, squalane, liquid paraffin, rape seed oil, cotton seed oil, tung oil, camellia oil, other vegetable oil (high boiling point oil) and the like can be mentioned. It is also possible to add an additive such as emulsifier and the like to a diluent for compound (I) and use the mixture as a water dispersible agent. As the additive, for example, alkylbenzenesulfonates, α-olefinesulfonates, alkanesulfonates, tetraammonium salts having long-chain alkyl groups, aliphatic mono- or di-ethanolamide, (poly)ethylene glycol ester or ether of fatty acid, glycerin ester of mono-fatty acid, sorbitan esters of fatty acid, polyoxyethylene sorbitan fatty acid ester, alkylphenyl polyoxyethylene ether, N-alkyl betaine-type or sulfobetain-type surfactants and the like can be mentioned. Of these, those having high safety, which are used as starting materials for cosmetics, such as sodium octylsulfosuccinate, polyoxyethylensorbitan monolaurate and the like are preferable. In addition, the agent comprising compound (I) can further contain auxiliary agent, stabilizer, thickener, coloring agent, flavor and the like, as necessary.  
      As a method of vaporizing a sufficient amount of a liquid agent comprising compound (I) to achieve the concentration of gaseous compound (I) in the aforementioned space where pest repellence is intended, any method capable of achieving the object can be used without a particular limitation. Such method and an apparatus to achieve the method are concretely and exemplarily shown in the following.  
      A method comprising placing an agent comprising compound (I) in a container having a porous wall, such as unglazed pottery, sintered metal and the like, and allowing compound (I) to vaporize from the about entire outer surface upon oozing of the agent comprising compound (I) out on the outer surface of the container. The container having a porous wall in this method corresponds to the reservoir means for an agent comprising compound (I) in the apparatus of the present invention, and is also a vaporization area expanding means. The reservoir means for an agent comprising compound (I) is not limited to the above-mentioned container and is not particularly limited as long as it can reserve an agent comprising compound (I) until vaporization. For example, the means may be a reservoir means embodied by preserving an agent comprising compound (I) in a container such as a glass or plastic bottle and the like, distributing the agent in the container closed tightly and cutting open a part of the container when in use, or opening the lid and transferring the contents into vaporization area expanding means or a container, and a vaporization area expanding means to be explained in the following also can be a reservoir means depending on the embodiment thereof.  
      As a different method, a method comprising immersing one end of a cloth, string or sponge like vaporization area expanding means having a wide surface area in a reservoir means for an agent comprising compound (I), thereby allowing the vaporization area expanding means to absorb the agent comprising compound (I) by a capillary phenomenon, or continuously supplying an agent comprising compound (I) from the reservoir means for the agent comprising compound (I) to the vaporization area expanding means, thereby allowing the agent to be absorbed, and vaporizing compound (I) from the surface of the vaporization area expanding means can be mentioned. Examples of the vaporization area expanding means used for this method include natural fibers such as pulp, cotton, hemp and the like; synthetic fibers such as polyester and the like; paper, fabric, knitted product, felt and non-woven fabric produced from glassfiber and the like; a sponge formed article which is a porous structure made from a synthetic resin or glass; and further, a strand, knitted product, fabric of hollow fiber produced from synthetic resin or glass, and the like can be mentioned. These are not particularly limited as long as they can expand the vaporization area of an agent comprising compound (I). While it is difficult to give a specific figure of the wide surface area necessary for its vaporization, because it varies depending on the conditions such as materials of the vaporization area expanding means and the like, the wider the surface area is, it is more possible to promote efficient vaporization. It is extremely difficult to measure the surface area of porous substances and the surface area of fiber products, but a surface area of at least 50 cm 2 , preferably not less than 100 cm 2 , is practical. In the case of a wide surface area, the concentration of compound (I) in a space where pest repellence is intended can be adjusted to fall within the above-mentioned range by reducing the concentration of compound (I) contained in the agent, and in the case of a small surface area, the concentration of compound (I) in the space can be adjusted to fall within the above-mentioned range by increasing the concentration of compound (I) contained in the agent.  
      As a different method for achieving the object mentioned in the foregoing paragraph, a method comprising coating or spraying an agent comprising compound (I) on a vaporization area expanding means having a wide surface area can be mentioned. In this case, a vaporization area expanding means corresponds to a reservoir means for an agent comprising compound (I). As examples of such coating or spray means, a brush, a spray, direct spraying from a bottle container, dropwise addition using a dropper, spraying using a sprinkling pot and the like can be mentioned.  
      Coating and spraying on a vaporization area expanding means may be performed once or plural times, and coating and spraying may be appropriately combined. For plural times of coating or spraying, the interval between respective coatings and sprayings is calculated based on actual measurement of disappearance time of compound (I) or theoretical assumption thereof, and before the interval period expires or when it has expired, the coating or spraying is preferably applied. It is recommended that a use manual should be attached, which describes such manner.  
      As mentioned above, vaporization of compound (I) can be also accelerated by increasing the surface area of a vaporization area expanding means. Since compound (I) has a high boiling point, it is more preferable to use a vaporization enhancing means to forcibly vaporize compound (I). Thus, in another embodiment of the present invention, the aforementioned concentration is preferably achieved by forcibly vaporizing compound (I) using a vaporization enhancing means via or not via a vaporization area expanding means, which means is explained now.  
      Since the vaporization enhancing means is not particularly limited as long as it can forcibly vaporize compound (I), any means can be used. It may intend to vaporize compound (I) alone or it may vaporize compound (I) when vaporizing other substances contained along with compound (I) in an agent comprising compound (I).  
      As such means, a heating means and an air blowing means can be mentioned. For example, when a heating means is used as an enhancing means to vaporize compound (I), as one embodiment to achieve the object of the present invention, one using an apparatus equipped with a heating means (preferably further equipped with a temperature control means), which heats an agent comprising compound (I) included in the inside of the apparatus to a suitable temperature by a heating means and a temperature control means, and vaporizes compound (I) from the inner and outer surfaces and/or outer surface of the apparatus can be mentioned. In another embodiment, an apparatus is used, wherein this apparatus is combined with the aforementioned vaporization area expanding means having a wide surface area, one end of the vaporization area expanding means is immersed in a reservoir containing an agent comprising compound (I) to allow absorption by a capillary phenomenon, or the agent comprising compound (I) is continuously supplied to a vaporization area expanding means to allow absorption, and a reservoir means or a vaporization area expanding means for the agent comprising compound (I) are heated to an appropriate temperature by a heating means and a temperature control means to forcibly evaporate compound (I). As the above-mentioned heating means, heat generation by heating wires such as nichrome wire and the like, low energy light sources such as a pilot lamp, and the like can be mentioned. As the above-mentioned temperature control means, a bimetal is most convenient, but one controlling an electric power to be supplied to a heating wire by inputting a temperature detected by a thermo couple, a thermistor and the like into a CPU may be used.  
      When an air blowing means is used as a vaporization enhancing means, use of an apparatus that forcibly vaporizes compound (I) by blowing an air by an air blowing means against a vaporization area expanding means that has absorbed an agent comprising compound (I) can be mentioned. As such air blowing means, fans such as a propeller fan, a sirocco fan and the like, a pump having a film and a valve (e.g., a pump used for bubbling an air into a water tank when raising goldfish) and the like can be mentioned. As a different embodiment, an apparatus wherein a heating means is incorporated in pair with an air blowing means, an agent comprising compound (I) is heated to an appropriate temperature by sending a warm air to a vaporization area expanding means to forcibly vaporize compound (I) can be mentioned.  
      A flash point of compound (I) is as low as about 110° C. and as high as about 160° C., and the heating temperature of a heating means is preferably a temperature not less than 10° C. lower than the flash point. This temperature needs to be appropriately adjusted in accord with the properties of the diluent and the like to be used alongside. For example, it is 50-110° C., preferably 60-100° C. In addition, the wind speed of the air blowing means is preferably 0.001-5 m/sec, and the air quantity is preferably 0.001-10 L/sec.  
      It is possible to have gaseous compound (I) present at a concentration of 0.001-20,000 μg/L in a space where pest repellence is intended, by regularly coating or spraying an agent comprising compound (I) on items placed in a house. As such items, for example, carpet, tatami mat, bedding, stuffed toy, floral tube, vase, decorative figurine, artificial flower, and other items generally set in a house can be mentioned. In one embodiment of the present invention, a method comprising adding an agent comprising compound (I) to a flooring wax or other polishing agents, impregnating a disposable mop, a reusable mop and the like therewith and coating a windowsill, a doorsill, a screen window and the like can be mentioned, and according to such method, invasion of pests can be prevented and pests can be forced out by evaporating compound (I) from a wide surface area and filling the vapor of compound (I) in the room or near the coated surface. An item to which an agent comprising compound (I) has been applied corresponds to a reservoir means for the agent comprising compound (I) and a vaporization area expanding means.  
      An agent comprising compound (I) can take any dosage form such as tablet, pellet, capsule, cream, ointment, aerosol, powder, liquid, emulsion, suspension and the like. An agent comprising compound (I) used for the method of the present invention can be used as a pest control agent containing compound (I) as an active ingredient (hereinafter to be simply referred to as an agent of the present invention). While the agent of the present invention can be used alone, it may be used concurrently with other pest control agents. In addition, other components effective for pest control may be added to ive a single preparation.  
      To facilitate use of the agent of the present invention, it is preferable to add, besides compound (I), a solvent, a carrier, an emulsifier, a stabilizer and the like to give a preparation and use the preparation by processing as necessary into a dilute solution and the like. Where necessary, other components, such as an antioxidant, a sustaining substance, a paint, a carrier, a flavor, a coloring agent and the like may be added or combined. It is preferable to make a flavor or a coloring agent function as an indicator informing the timing of replacing the item for controlling pests using the agent of the present invention. For example, a flavor having a lower boiling point than that of compound (I), which loses fragrance the item for controlling pest had when use was started, before disappearance of compound (I) or which clearly indicates the change of fragrance, is preferably added.  
      Of compounds (I), those having a double bond are gradually oxidized in the air. To prevent this, an antioxidant is preferably added or concurrently used. As the antioxidant, for example, phenol type antioxidants such as vitamin E, butylhydroxytoluene, Irganox 1010, Irganox 1076 and the like; polyphenol type antioxidants such as tannic acid, gellic acid and the like are used. The amount of use thereof is preferably in the range of 0.001-10 wt %, more preferably in the range of 0.1-5 wt %, relative to compound (I).  
      As a pest controlling ingredient that can be added besides compound (I), for example, compounds having a repellent effect against pests such as diethyltoluamide, 2,3,4,5-bis(Δ2-butylene)-tatrahydrofurfural, di-n-propyl isocinchomeronate di-n-butylsuccinate, 2-hydroxyethyloctylsulfide, 2-t-butyl-4-hydroxyanisole, 3-t-butyl-4-hydroxyanisole, 1-ethynyl-2-methyl-pentenyl 2,2,3,3-tetramethylcyclopropanecarboxylate, N-hexyl-3,4-dichloromaleimide and the like can be mentioned. A pest control agent containing these components can be used concurrently with the agent of the present invention.  
      As the above-mentioned solvent, any solvent can be used as long as it does not exert an adverse influence on compound (I). As such solvent, for example, alcohols such as ethyl alcohol, isopropyl alcohol and the like; silicone oil, polyethylene glycol, polypropylene glycol, jojoba oil, squalane, liquid paraffin; rape seed oil, cotton seed oil, tung oil, camellia oil, other vegetable oils and the like can be mentioned. The amount of use thereof is preferably in the range of 10-99 wt %, more preferably in the range of 50-95 wt %, of the entire preparation.  
      As the above-mentioned carrier, any carrier can be used as long as it does not exert an adverse influence on compound (I). As such carrier, for example, silica, active charcoal, porous zirconium phosphate, porous alumina, diatomaceous earth, perlite, vermiculite, zeolite, galleon earth, wood powder, wood chip and the like can be mentioned. As the above-mentioned emulsifier, any emulsifier can be used as long as it does not exert an adverse influence on compound (I). As such emulsifier, for example, alkylbenzenesulfonates, α-olefinesulfonates, alkanesulfonates, tetraammonium salts having long-chain alkyl groups, aliphatic mono- or di-ethanolamide, (poly)ethylene glycol ester or ether of fatty acid, glycerin ester of mono-fatty acid, sorbitan esters of fatty acid, polyoxyethylene sorbitan fatty acid ester, alkylphenyl polyoxyethylene ether and the like can be mentioned. The amount of use thereof is preferably in the range of 5-90 wt %, more preferably in the range of 10-50 wt %, of the entire preparation.  
      As the above-mentioned stabilizer, any stabilizer can be used as long as it does not exert an adverse influence on compound (I). As such stabilizer, for example, polyvinyl alcohol, gelatin, carboxymethylcellulose, polyvinylpyrrolidone, polyethylene glycol, macrogol, acacia, starch and the like can be mentioned.  
      As the above-mentioned sustaining substance, any sustaining substance can be used as long as it does not exert an adverse influence on compound (I), and includes thermoplastic resins, waxes, gels, various microcapsules and the like.  
      The agent comprising compound (I) may be a solid. As a sustaining substance to be added to give a solid, for example, thermoplastic resins, waxes, gels, microcapsules, porous inorganic particles and the like can be mentioned.  
      The agent comprising compound (I) to be used for the method of the present invention may be a formed solid. The formed solid may take any form of granule, pellet, rod, sheet, bulk, flake, sponge and the like, and may be used as a closet dusting powder, an under floor dusting powder and the like, or as an interior decoration, such as a decorative figurine for an alcove ornament, a vase, a calendar, a tapestry, a candle and the like. In addition, a formed product can be used in a container that permits easy vaporization of compound (I) at important points in the house. By taking the form of a formed product, compound (I) can be vaporized for a longer period as compared to the use as the aforementioned liquid.  
      With regard to the thermoplastic resin, use of a resin having a markedly high molding temperature results in vaporization of compound (I) and the like and marked generation of white smoke upon kneading compound (I) or a dilute solution thereof during molding. Therefore, a thermoplastic resin having a molding temperature of less than 200° C., preferably not more than 160° C., more preferably not more than 140° C., is preferably used. In contrast, use of a resin having a markedly low molding temperature results in a limited use due to high stickiness of the resin. Thus, a resin having a molding temperature of not less than 50° C. is preferably used. As the preferable thermoplastic resin, for example, low melting point resins such as a soft acrylic resin comprising (meth)acrylic ester-copolymer, a soft acrylic resin prepared to have a core-shell structure consisting of a rubber part and a hard resin part, an ethylene-vinyl acetate copolymeric resin, a poly(trans-isoprene) resin, a thermoplastic elastomer prepared by block polymerization of styrene-butadiene or isoprene and the like, poly-e-caprolactone, poly-D,L-decalactone, polydioxinone, urethane resins and the like can be mentioned. The amount of compound (I) to be added to a thermoplastic resin is preferably determined for prolonging the effective period by empirically setting an upper limit amount free of bleeding of compound (I) from the resin and choosing the highest possible amount within the limits. For example, when a soft acrylic resin is used as a thermoplastic resin, the amount of compound (I) to be added is preferably within the range of 10-50 wt %.  
      As the waxes, for example, higher alcohol, candelilla wax, rice wax, carbawax, Japan wax, yellow beeswax, microcrystalline wax, polyethylene wax, stearic acid, paraffin wax, vaseline, whale oil, beef tallow and the like can be mentioned. The amount of compound (I) to be added to these waxes is preferably determined for prolonging the effective period by empirically setting an upper limit amount free of bleeding of compound (I) from the wax and choosing the highest possible amount within the limits. For example, when stearic acid is used as a wax, the amount of compound (I) to be added is preferably within the range of 10-60 wt %.  
      As the gels, one that can become an oil gel is preferable for containing a large amount of compound (I). For example, a gelling component such as sodium stearate, aluminum stearate, aluminum 2-ethylhexanoate, dibenzylidene sorbitol and the like is added to compound (I), and a small amount of alcohol or water is used to prepare a gel product. The amount of compound (I) to be added to such gel is preferably 10-60 wt %.  
      As the above-mentioned paint, any paint can be used as long as it does not exert an adverse influence on compound (I). As such paint, for example, varnish; enamel; acetylcellulose lacquer; ethylcellulose lacquer; alkyd resin enamels and varnishes; vinyl resin enamels and varnishes such as vinyl chlorides, vinyl acetate-methacrylates, styrene-butadienes and the like; pigment oil paste paint and the like can be mentioned. When compound (I) is added to these paints, an amount is preferably determined for prolonging the effective period by empirically setting an upper limit amount free of stickiness of paint after drying and choosing the highest possible amount within the limits. When it is added to, for example, varnish, the amount of compound (I) to be added to the paint is preferably within the range of 1-10%.  
      As the above-mentioned flavor, any of natural flavors and synthetic flavors can be used as long as it does not exert an adverse influence on compound (I) and does not prevent the pest repellent effect of compound (I). When the agent of the present invention is used in the living space, use of highly safe flavor is particularly preferable. As the natural flavor, for example, bergamot oil, mentha oil, lemongrass oil, eucalyptus oil, Japanese cypress oil, citronella oil and the like can be mentioned, and as the synthetic flavor, for example, terpenoid flavors such as linalool, lynalyl acetate, geraniol, nerolidol, citral and the like can be mentioned.  
      The porous inorganic particles mean porous particles made from hardly soluble or insoluble inorganic powder, having an average particle size of from 1 μm to 10 mm, more preferably from 2 μm to 5 mm, and having a BET surface area of not less than 50 m 2 /g, more preferably not less than 100 m 2 /g.  
      The porous inorganic particles comprise silica; metal oxides such as alumina, zinc oxides, magnesium oxides, titanium oxides, zirconium oxides and the like; metal hydroxides such as aluminum hydroxides, magnesium hydroxides and the like; metal silicates such as calcium silicates, magnesium silicates, aluminum silicates and the like; metal carbonates such as calcium carbonate, magnesium carbonate and the like; metal sulfates such as calcium sulfate, magnesium sulfate and the like; clay minerals such as montmorillonite, talc, pyrophyllite, zeolite and the like; and the like.  
      The porous inorganic particles may be synthesized by a sol-gel method using metal alkoxide and the like, an ion exchange method using a soluble salt of a metal and the like, or naturally occurring ones may be used as they are or after purification. When the synthesized or naturally occurring inorganic material itself is an already substantial porous solid, this porous solid may be appropriately adjusted to an easy-to-use size by a means such as pulverization, sieving and the like and used as a carrier to absorb compound (I). When such method is not directly available, the synthesized or naturally occurring inorganic material may be suspended in a solvent such as water and the like and granulated by a spray-dry method, or granulated to a desired particle size in a granulator that rotates a slurry or a powder while drying and the like, adjusted in size, and where necessary, and sintered and the like to secure stability of the particles, which are then used as a carrier. As a modified method, a clay mineral having enlarged layer-to-layer spacing by a treatment with tetraammonium salts may be used as a carrier; a binder made from an organic polymer substance that improves binding of inorganic powders and compound (I) may be granulated simultaneously to introduce compound (I) at once into the inorganic carrier; and an organic polymer substance containing compound (I) as a binder may be mixed with these inorganic powders and the powder mixture can be granulated together.  
      The agent of the present invention can be prepared into any dosage form, such as an aerosol, an oil agent, a fumigant, a sheet, a powder, a microcapsule, a water dispersible agent and the like by a known method. The agent of the present invention in these dosage forms is applied to various materials such as woven cloth, knitted cloth, wet type non-woven fabric (paper), dry type non-woven fabric, plywood, synthetic resin sheet, synthetic resin plate, wood and the like by the operations of spraying, coating, impregnation, spreading and the like.  
      When compound (I), which is the active ingredient in the agent of the present invention, is added to various resins and processed into molded objects such as fiber, film, sheet, plate and the like, and these molded objects are used as starting materials for production of commodities for living in a house where pests inhabit, such as various building materials, tatami mat, bedding, carpet, batting and the like, and the molded objects are used as members for controlling pests, the aforementioned molded objects, commodities for living and various members that express a pest controlling effect are also encompassed in the present invention. When a preparation is formed, the content of compound (I) in the agent of the present invention is preferably in the range of 0.1-99 wt %, more preferably in the range of 5-99 wt %.  
      The amount of the agent of the present invention to be used is not particularly limited as long as a pest controlling effect is expressed, but it is, for example, preferably in the range of about 0.01-10 g, more preferably in the range of about 0.1-3 g, based on compound (I), per unit area 1 m 2  of a target object for the operation of spraying, coating, impregnation, spreading and the like. When compound (I) is added to various resins and processed into molded objects such as fiber, film, sheet, plate and the like, moreover, the content of compound (I) in the molded object is preferably in the range of about 1-60 wt %, more preferably in the range of about 10-50 wt %. In addition, the agent of the present invention can be formed into microcapsules. As the microcapsule, microcapsules prepared by surface polymerization, in situ polymerization, submerged curing coating, core salvation, physical and mechanical production method or a combination of these known methods are used. As the wall materials of microcapsules, for example, polyester, polyamide, polyurethane, polyurea, epoxy resin, polystyrene resin, ethylene-vinyl acetate copolymer, polylactic acid resin, acrylic resin, cellulose resin, sodium alginate, acacia, polyvinyl alcohol, gelatin, albumin and the like can be mentioned, with preference given to polylactic acid resin.  
      While the average particle size of the microcapsule is not particularly limited, but it is preferably in the range of 10 μm-1 mm, more preferably in the range of 20 μm-500 μm. The reason therefor is that, when the particles of microcapsules are too fine, compound (I) inside is released in a short time, oxidized, and the effective period of microcapsules becomes short. On the other hand, when the particles of microcapsules are too coarse, kneading into molded objects and the like becomes difficult and the kinds of objects capable of containing the particles are limited. For example, when microcapsules are adhered to a fiber product using a binder, the microcapsules are regarded clearly as a foreign substance and artificially eliminated, or intentionally crushed to stain the fiber products.  
      The amount of the microcapsules used to achieve the aforementioned pest repellence concentration is preferably not less than 3 g, more preferably not less than 5 g, per 1 m 2  of the space where repellence is intended, such as inside a room and the like. The release of compound (I) from the microcapsules is limited to a very low level, and even if a large amount is used, no problem occurs in terms of living environment. In consideration of economical aspect, and those who are highly sensitive to smell and do not like the smell of compound (I), however, it is preferably not more than 100 g, more preferably not more than 50 g, per 1 m 2 .  
      By kneading the agent of the present invention with the aforementioned thermoplastic resins and then molding, a tape, a film, a sheet, a fiber, or other molded objects, having pest controllability, can be obtained. By processing these molded objects, closet spread materials, placement materials, clothing spreads, furniture back placement materials, under tatami mat spreads, floor sheets, carpet sheets, automobile interior aterials, bed mats, mattresses, animal pest control bands (collars), pet animal clothings, pet animal spread and the like with pest controllability can be obtained. In addition, by attaching the agent of the present invention to a fiber product using a binder, a broad range of fiber products can have pest controllability, which may then be processed into pest controllable fiber products such as bedding, coverlet for kotatsu and the like. The agent of the present invention can be added to a paint, a paste agent and a spraying agent, which can be used as a paint or an adhesive for building materials, or sprayed on kennels and furnishings for pets and animals, or sprayed onto the body of an animal, whereby pests attached to kennels and animal bodies can be forced out.  
      The pests to be the target for the method for controlling pest and the control agent of the present invention are those belonging to the class Insecta, the class Arachnida, the class Chilopoda, the class Symphyla, the class Diplopoda, the class Pauropodra, the class Gastropoda or the class Hirudinea. They include, for example, 
      pests belonging to the class Insecta such as pests belonging to the Isoptera such as Rhinotermitidae, Termitidae and the like,     pests belonging to the Orthoptera such as Blattellidae, Blattidae, Acrididae, Tettigoniidae, Gryllidae, Gryllotalpidae and the like,     pests belonging to the Hemiptera such as Aphididae, Delphacidae, Cicadellidae, Typhlocybidae, Pentatomidae, Cydnidae, Plataspidae, Acanthosomatidae, Coreidae, Lygaeidae, Meridae, Pseudococcidae, Coccidae, Diaspidiae, Aleyrodidae, Psyllidae and the like,     pests belonging to the Coleoptera such as Dermestidae, Scarabaeidae, Coccinellidae, Cerambycidae, Chrysomelidia, Scolytidae, Curculionidae, Rhynchophoridae, Bruchidae and the like,     pests belonging to the Hymenoptera such as Formicidae, Tenthredinidae, Vespidae, Siricidae, Cynipidae and the like,     pests belonging to the Diptera such as Culicidae, Muscidae, Cecidomyiidae, Chloropidae, Tephritidae, Agromyzidae, Chironomidae, Anthomyiidae and the like,     pests belonging to the Lepidoptera such as Yponomeutidae, Noctuidae, Tineidae, Lyonetiidae, Gracillariidae, Phyllocnistidae, Sphingidae, Sesiidae, Tortricidae, Pyralidae, Lymantriidae, Sphingidae, Papilionidae, Lycaenidae and the like, and the like;     pests belonging to the class Arachnida such as pests belonging to Araneina (e.g., Araneidea, Theridiidae, Linyphiidae, Liphistiidae, Lycosidae, Thomisidae and the like),     pests belonging to Scorpionida (e.g., Butnus and the like), and the like;     pests belonging to the class Gastropoda such as Philomycidae and the like;     pests belonging to the class Hirudinea; 
 
 and the like can be mentioned. 
   

      More specifically, for example, the following can be mentioned.  
      I. class Insecta  
     
         
         
           
              Rhinotermitidae 
             Reticulitermes speratus, Coptotermes formosanus  etc.    
         
              Blattellidae 
             Blattella germanica, Blattella lituricollis  etc.    
         
              Blattidae 
             Periplaneta fuliginosa, Periplaneta americana  etc.    
         
              Acridiae 
             Mecostethus magister, Patanga japonica  etc.    
         
              Aphididae 
             Acyrthosiphon pisum, Aphis pomonella, Brevicoryne brassicae  etc.    
         
              Delphacidae 
             Laodelphax stratella  etc.    
         
              Cicadellidae 
             Recilia oryzae, Orientus ishidae  etc.    
         
              Pentatomidae 
             Nezara antennata, Lagynotomus elongatus  etc.    
         
              Pseudococcidae 
             Geococcus oryzae, Planococcus citri  etc.    
         
              Aleyrodidae 
             Trialeurodes packardi, Trialeurodes vaporariorum  etc.    
         
              Psyllidae 
             Psylla mali, Psylla pyrisuga  forst etc.    
         
              Dermestidae 
             Anthrenus verbasci, Attagenus japonicus  etc.    
         
              Scarabaeidae 
             Rhomborrhina japonica, Holotrichia kiotoensis , Cetoniine beetles etc.    
         
              Coccinellidae 
             Epilachna boisduvali, Epilachna vigintioctopunctata  etc.    
         
              Cerambycidae 
             Anoplophora malasiaca, Oberea japonica, Prionus insularis  etc.    
         
              Chrysomelidae 
             Aulacophora femoralis, Galerucella grisescens, Donacia provosti  Fairmaire etc.    
         
              Scolytidae 
             Scolytus japonicus  Chapuis,  Tomicus piniperda, Xyleborus sobrinus  etc.    
         
              Formicidae 
             Camponotus japonicus, Camponotus kiusiuensis, Formica japonica  etc.    
         
              Tenthredinidae 
             Allantus albicinctus, Caliroa matsumotonis  etc.    
         
              Vespidae 
             Vespa mandarinia, Vespa simillima  etc.    
         
              Culicidae 
             Culex pipiens, Culex tritaeniorhynchus  Giles etc.    
         
              Muscidae 
             Musca domestica, Musca bezzii, Muscina stabulans  etc.    
         
              Cecidomyiidae 
             Contarinia okadai  Miyoshi,  Contarinia mali  etc.    
         
              Chloropidae 
             Chlorops oryzae, Meromyza nigriventris  etc.    
         
              Tephritidae 
             Dacus tsuneonis, Zeugodacus cucurbitae, Dacus depressus  etc.    
         
              Agromyzidae 
             Agromyza oryzae, L. brassicae  etc.    
         
              Chironomidae 
             Chironomus oryzae  etc.    
         
              Yponomeutidae 
             Plutella xylostella, Yponomeuta malinellus  etc.    
         
              Noctuidae 
             Autographa nigrisigna, Sesamia uiferens  etc.    
         
              Tineidae 
             Nemapogon granellus, Tinea translucens  etc.    
         
              Lyonetiidae 
             Lyonetia clerkella  etc.    
         
              Gracillariidae 
             Caloptilia zachrysa, Acrocercops astaurota  etc.    
         
              Phyllocnistidae 
             Phyllocnistis citrella, Phyllocnistis toparca  etc.    
         
              Sphingidae 
             Acosmeryx castanea, Marumba gaschkewitschii  etc.    
         
              Sesiidae 
             Synanthedon hector, Paranthrene regalis  etc.    
         
              Tortricidae 
             Archips breviplicanus, Cornicacoecia lafauryana  etc.    
         
              Pyralidae 
             Conogethes punctiferalis, Chilo suppressalis  etc.    
         
              Lymantriidae 
             Lymantria dispar, Calliteara pseudabietis  etc.    
         
              Sphingidae 
             Marumba gaschkewitschii  etc.    
         
              Lycaenidae 
             Pieris rapae, Colias erate  etc.    
         
              Papilionidae 
             Papilio xuthus, Papilio protenor  etc. 
 
 II. class Arachnida 
   
         
              Araneidea 
             Araneus ventricosus, Gasteracantha kuhlii  etc.    
         
              Theridiidae 
             Achaearanea tepidariorum, Achaearanea culcivora  etc.    
         
              Linyphiidae 
             Linyphia  etc.    
         
              Liphistiidae 
             Carrhotus xanthogramma  etc.    
         
              Lycosidae 
             Lycosa coelestis, Lycosa ishikariana  etc.    
         
              Thomisidae 
             Xysticus audax, Oxytate striatipes, Misumenops tricuspidatus  etc. 
 
 III. class Latigastra 
   
         
               Pandinus imperator  etc. 
 
 IV. class Chilopoda 
 
               Scolopendra subspinipes multidens  Newport,  Bothropolys rugosus, Thereuonema tuberculata, Pleurogeophilus  etc. 
 
 V. class Symphyla 
 
               Hanseniella, Scutigerella nodicerca, Symphylella vulgaris  etc. 
 
 VI. class Diplopoda 
 
               Parafontaria laminata , Julida,  Diplomaragna, Tokyosoma takakuwai  Verhoeff etc. 
 
 VII. class Pauropodra 
 
              Pauropodra etc. 
 
 VIII. class Gastropoda 
 
               Limax marginatus, Incilaria, Limax flavus  etc. 
 
 IX. class Hirudinea 
 
               Hirudo nipponia, Erpobdella lineata  etc.  
           
         
       
    
      Being applicable to a broad range of pests as shown above, the agent of the present invention is effectively utilized for protection of agricultural products, preserved grain and the like from various pests, improvement in the safety and hygiene of the living environment and the like, and the like.  
     EXAMPLES  
      The present invention is explained in detail by referring to the following Examples, which are not to be construed as limitative.  
     Reference Example 1  
     Measurement of Farnesylacetone Concentration in the Air  
      Farnesylacetone (1 mL) was placed in a 50 mL sample bottle, and a large magnetic stirring bar capable of rotating the air as well was placed therein. The bottle was placed neck-deep in an oil bath at 130° C. with rotation, and heated for 1 hr to saturate the inside of the sample bottle with farnesylacetone vapor. Thereafter, the gas in the sample bottle was taken by 5 mL with a gas tight syringe, and using gas chromatography with an FID detector, the concentration of farnesylacetone was measured by the absolute calibration method. As a result, 20,000 μg/L of farnesylacetone was found to be contained in this 5 mL gas. This sampled gas somewhat contained a white mist, had a strong odor, caused cough when inhaled in a large amount, and provoked uncomfortable feeling in human.  
      Farnesylacetone (1 mL) was placed in a 50 mL sample bottle, and a large magnetic stirring bar capable of rotating the air as well was placed therein The bottle was placed neck-deep in a water bath at 60° C. with rotation, and heated for 1 hr to fill the inside of the sample bottle with farnesylacetone vapor. Thereafter, the gas in the sample bottle was taken by 5 mL with a gas tight syringe, and using gas chromatography with an FID detector, the concentration of farnesylacetone was measured by an absolute calibration method. As a result, 20 μg/L of farnesylacetone was found to be contained in this 5 mL gas. Almost simultaneously, the gas (5 mL) in the sample bottle was taken again, a propeller was set in a 10 L beaker, the gas was added into the sealed beaker, the air in the beaker was stirred with the propeller for 10 min to dilute the gas 2,000-fold, whereby gas containing 0.01 μg/L farnesylacetone was obtained. The diluted gas (200 mL) was sampled with a syringe, a propeller was set in a 2 L flask, the gas was added into the sealed flask, the air in the beaker was stirred with the propeller for 10 min to further dilute the gas 10-fold, whereby gas containing 0.01 μg/L farnesylacetone was obtained. This sampled gas scarcely had an odor detected by human.  
     Examples 1 and 2 and Comparative Example 1  
      A 20-mesh soft wire net was cut into 15×16 cm, folded into two, and open two sides (longitudinal and transverse sides) were folded to give a bag. Four of these bags were prepared. Farnesylacetone (mixing ratio:cis-trans form/cis-trans form and trans-cis form/trans-trans form=15/50/35) was dissolved in ethanol at 0.2 wt % and 1 wt % and one wire net bag each was immersed in one of the obtained solutions for about 10 sec. The bag was taken out from the solution, and air-dried at room temperature for 30 min to give a farnesylacetone treated wire net bag. The wire net bag treated with farnesylacetone 0.2 wt % solution was taken as Example 1, and the wire net bag treated with farnesylacetone 1 wt % solution was taken as Example 2. In addition, DEET was dissolved in ethanol at 1 wt %, and a wire net bag treated in the same manner with the obtained solution was taken as Comparative Example 1. The wire net bags of Examples 1 and 2 and Comparative Example 1 were evaluated in Experimental Example 1 for the repellent effect on adult female  Culex pipiens  using an untreated wire net bag as a control.  
     Experimental Example 1  
      50 to 70 female adult  Culex pipiens  at 10-15 days after eclosion and having high blood sucking activity were released inside each of four adult raising cages (30×40×30 cm). One mouse was placed from the opening of each wire net bag of Example 1, Example 2, Comparative Example 1 and control and fixed as a blood source. The wire net bags were placed in the cages in which  Culex pipiens  were released. As a blood sucking result, the number of the test  Culex pipiens  with swollen abdomen was counted at a certain time intervals after the start of the test, which number was divided by the number of test  Culex pipiens  to calculate a blood sucking rate (%). The test was conducted inside a room maintained at a temperature of 23-24° C. The test results are shown in Table 1.  
                                   TABLE 1                                      mouse-           blood sucking           fixed   agent for   number   rate (%) with           wire net   treatment   of test   lapse of time                                         cage   bag   (treatment   insects   2 hr   6 hr   18 hr       No.   disposed   concentration)   (mosquitoes)   later   later   later                                                 1   Example 1   farnesylacetone   54   0   0   5.6               (0.2%)       2   Example 2   farnesylacetone   64   0   0   0                 (1%)       3   Comparative   DEET   52   0   25.0   38.5           Example 1     (1%)       4   Control   —   59   30.5   86.4   91.5                  
 
     Examples 3 and 4  
      A mixture of farnesylacetone (mixing ratio:cis-cis form/cis-trans form and trans-cis form/trans-trans form=15/50/35) and vitamin E (antioxidant) (weight ratio 99:1) was dissolved in methanol at 0.06 wt % and 0.3 wt %. The obtained solutions were coated on a 0.26 mm thick paper sheet at 167 g/l m 2 , and air-dried to evaporate methanol, whereby sheets having a farnesylacetone coating at 0.1 g/m 2  and 0.5 g/m 2  were obtained and used as Example 3 and Example 4, respectively. Both a farnesylacetone coating sheet prepared on the very day and one left open and uncontrolled by hanging in a room at a room temperature of 21-24° C. for 2 weeks, where ventilation rate was 10-15 times per 1 hour, were evaluated in Experimental Examples 2-4 for repellence performance against the larvae of  Blattella germanica, Camponotus japonicus  and  Anthrenus verbasci  using untreated paper sheet as a control.  
     Experimental Example 2  
      One box shelter (length 8 cm×side 12.5 cm×height 2 cm, made of white corrugated cardboard) having one entrance (width 1 cm×height 2 cm) and one of the test-day-made products of Example 3 and 4, the products left open and uncontrolled for 2 weeks of Example 3 and 4 and a control paper sheet, which was adhered to an interior floor surface, was prepared for each test sample. In a square tinplate container (floor area 1 m 2 , depth 17 cm) were disposed 5 kinds of box shelters on a concentric circle with the openings facing the center. In the tinplate container, feed and drinking water were placed in the center. In the container were released 25 male or 25 female  Blattella germanica  and the number of cockroaches in each lurking place was counted with the lapse of time. The test results for male  Blattella germanica  are shown in Table 2 and the test results for female  Blattella germanica  are shown in Table 3. The test was performed in a room maintained at a temperature of 23-24° C.  
                           TABLE 2                                          number of cockroaches           farnesylacetone   present (cockroaches)                                         amount for   Start                       treatment   of   1 hr   4 hr   24 hr       lurking place   (g/m 2 )   test   later   later   later                                             Outside box shelter   —   25   0   3   0       Example 3 (test-day-   0.1   0   0   0   0       made product) housing       box shelter       Example 3 (product   0.1   0   2   4   1       left open and       uncontrolled for 2       weeks) housing box       shelter       Example 4 (test-day-   0.5   0   0   0   0       made product) housing       box shelter       Example 4 (product   0.5   0   0   0   0       left open and       uncontrolled for 2       weeks)housing box       shelter       control paper sheet   0   0   23   18   24       housing box shelter                  
 
     
       
         
           
               
               
               
             
               
                   
                 TABLE 3 
               
             
            
               
                   
                   
               
               
                   
                   
               
               
                   
                   
                 number of cockroaches 
               
               
                   
                 farnesylacetone 
                 present (cockroaches) 
               
            
           
           
               
               
               
               
               
               
            
               
                   
                 amount for 
                 Start 
                   
                   
                   
               
               
                   
                 treatment 
                 of 
                 1 hr 
                 4 hr 
                 24 hr 
               
               
                 Lurking place 
                 (g/m 2 ) 
                 test 
                 later 
                 later 
                 later 
               
               
                   
               
            
           
           
               
               
               
               
               
               
            
               
                 Outside box shelter 
                 — 
                 25 
                 4 
                 8 
                 0 
               
               
                 Example 3 (test-day- 
                 0.1 
                 0 
                 0 
                 0 
                 0 
               
               
                 made product) housing 
               
               
                 box shelter 
               
               
                 Example 3 (product 
                 0.1 
                 0 
                 5 
                 3 
                 2 
               
               
                 left open and 
               
               
                 uncontrolled for 2 
               
               
                 weeks) housing box 
               
               
                 shelter 
               
               
                 Example 4 (test-day- 
                 0.5 
                 0 
                 0 
                 0 
                 0 
               
               
                 made product) housing 
               
               
                 box shelter 
               
               
                 Example 4 (product 
                 0.5 
                 0 
                 0 
                 0 
                 0 
               
               
                 left open and 
               
               
                 uncontrolled for 2 
               
               
                 weeks)housing box 
               
               
                 shelter 
               
               
                 control paper sheet 
                 0 
                 0 
                 16 
                 14 
                 23 
               
               
                 housing box shelter 
               
               
                   
               
            
           
         
       
     
     Experimental Example 3  
      During daytime of a sunny day in early summer, one mound of  Camponotus japonicus  showing lively outdoor activity was selected, the sheets of Example 3 and Example 4 prepared on the very day of the test and a control paper sheet were cut in 10 cm diameter circles and placed at a point that shares an about 50 cm diameter concentric circle into three equal pieces, with the entrance to the mound of  Camponotus japonicus  at the center, and about 1 g of powder sugar was placed at the center of each test sheet. A test was sequentially repeated 3 times by changing the positions of the sheets, wherein the ants gathered on the sugar on the test sheet 1 hr later were captured with a transparent pressure-sensitive adhesive sheet. The results of the count of the captured ants are shown in Table 4.  
                           TABLE 4                                          number of           farnesylacetone   ants captured           amount   on sheet (ants)                                         test   for treatment   First   Second   Third           sheet   (g/m 2 )   test   test   test                                                     Example 3   0.1   3   12   5           Example 4   0.5   1   3   0           Control   0   32   54   83           paper           sheet                      
 
     Experimental Example 4  
      In a paper box (length 30 cm×side 30 cm×depth 10 cm) were placed the sheets of Examples 3 and 4 prepared on the very day of the test and a control paper sheet, which had been cut into 7 cm diameter circles, such that the center of the circles came on the point that shared the circumference of a 15 cm diameter circle having the same center with the box into three equal pieces, and one 6 cm diameter circle of a thick woolen cloth was placed on the center of each test sheet. Then 30 larvae of  Anthrenus verbasci  were released at the center of the box, and the number of  Anthrenus verbasci  larvae present on the wool blanket on each test sheet was counted with the lapse of time. The results are shown in Table 5. The test was performed in a room maintained at a temperature of 23-24° C.  
                           TABLE 5                                          number of                 Anthrenus    verbasci                 larvae present on           farnesylacetone   the wool blanket on           amount   test sheet (larvae)                                             for treatment   0 hr   24 hr   48 hr           test sheet   (g/m 2 )   later   later   later                                                     Example 3   0.1   0   0   1           Example 4   0.5   0   0   0           Control   0     0   21   29           paper           sheet           Outside   —   30   9   0           sheet                      
 
     Example 5  
      Farnesylacetone (mixing ratio:cis-cis form/cis-trans form and trans-cis form/trans-trans form=15/50/35) was dissolved in ethanol at 1 wt % and 20×10×10 mm pine wood was immersed in the obtained solution for 10 min The pine wood taken out from the solution thereafter was air-dried at room temperature for one day to evaporate ethanol to give a pine wood impregnated with farnesylacetone. Based on the difference in the weight of the pine wood before and after the impregnation, about 30 mg of farnesylacetone was absorbed. A repellent effect of this farnesylacetone impregnated pine wood on  Reticulitermes speratus  was evaluated in Experimental Example 5 using a pine wood impregnated with ethanol alone and air-dried in the same manner as a control.  
     Experimental Example 5  
      A styrole container (95×60×20 mm) was partitioned into 3 sections (size of 1 section: 30×60×20 mm; farnesylacetone impregnated pine wood installed section, center section, control pine wood installed section), a 5 mm diameter hole for the passage of the termites was made at a lower center part of two partition walls, and farnesylacetone impregnated pine wood or control pine wood, which had been wetted with water, was placed in each of two sections on both ends as a feed for the termites. Fifty worker ants of  Reticulitermes speratus  were released in the center section, the outside of the container was completely covered with an aluminum foil to darken the inside, which was maintained at 23-24° C., and the number of the termites in each section was counted at a given time intervals, and whether or not farnesylacetone impregnated pine wood was repellent was observed. About 2 mm diameter ventilation hole was formed in each section of the container and water was supplied any time from the above by dropwise addition to the pine wood. The test results are shown in Table 6.  
                       TABLE 6                                      number of termites in each section                                         farnesylacetone                       impregnated               pine wood           lapse of test   installed   center   control pine wood           time   section   section   installed section                                                 Start of test   0   50   0           0.5 hr later   5   38   7             1 hr later   4   5   41             2 hr later   5   8   37            24 hr later   2   4   44            48 hr later   3   0   47                      
 
     Experimental Example 6  
      Three sets of experiment systems were prepared wherein quartz sand allowed to absorb a suitable amount of water was spread on a 90 mm diameter schale in a thickness of 1 mm, a 5 mm width groove was formed on a diameter line to divide the dish into two, three 8 mm diameter circular filters impregnated with a suitable amount of a solution of farnesylacetone or phytone in acetone and air-dried were placed in one test section, and three untreated circular filters were placed in the control section.  
      In each experiment system were each released 10 worker ants of  Coptotermes formosanus  and raised in an incubator at 28° C., humidity 70%. After a certain time, the number of  Coptotermes formosanus  in the test section and the control section was counted. The results are shown in Table 7. The repellence rate and mortality were calculated from the following formulas. 
 
Repellence rate={1−(number of the ants in the test section/number of the survived ants)}×100 (%) 
 
Mortality=number of the dead ants/30×100 (%) 
 
                           TABLE 7                                      1 day later   4 days later                                     farnesyl-       farnesyl-           agent   acetone   phytone   acetone   phytone                                                         concentration   1%    5%   10%   50%    1%    5%   10%   50%       test section   4   0   11   4   0   1   —   —       control   25    28    19   25    29    26    —   —       section       death   1   2    0   1   1   3   —   —       repellence   86%    100%   63%   86%   100%   96%   —   —       rate       mortality   3%    7%    0%    3%    3%   10%   —   —                  
 
     Example 6  
      A mixture of farnesylacetone (mixing ratio:cis-cis form/cis-trans form and trans-cis form/trans-trans form=15/50/35), butylhydroxytoluene (antioxidant) and propyleneglycol monostearate (emulsifier) (weight ratio 88:2:10) was added to water at 1 wt % and the mixture was vigorously stirred to give an emulsion liquid. The repellence performance of this emulsion liquid on  Acyrthosiphon pisum  during favabean growing was evaluated in Experimental Example 7. In addition, the control performance of this emulsion on various pests belonging to  Lepidoptera  during broccoli growing was evaluated in Experimental Example 8.  
     Experimental Example 7  
      Columns (height 2 m) were built at the four corners of a 2 m×4 m area in a field free of insecticide including the neighboring fields, and insect screens were set all around and the ceiling using the columns to isolate the area from the outside space. The patch in the net room prepared with the insect screens was divided into two equal parts and used as a test section and a control section (each 2 m×2 m), wherein 4 roots of favabean seedlings were fix planted in both sections. The test section and the control section were not partitioned, and about 500  Acyrthosiphon pisum  were released inside of the net room. The emulsion of Example 6 was sprayed on favabean in the test section at a frequency of once every two weeks at 10-50 mL per 1 root every time, according to the growth of favabean. As a result,  Acyrthosiphon pisum  survived on the top stem foliage and pods of favabean in the control section during the growing period, but  Acyrthosiphon pisum  was not observed on favabean in the test section throughout the growing period. In addition, drug-induced suffering did not occur in the favabean grown in the test section.  
     Experimental Example 8  
      A 10 m×20 m area in a field free of insecticide including the neighboring fields was divided into two equal parts and used as a test section and a control section. Broccoli seedlings were fix planted and grown in both sections at about 60 cm intervals. The emulsion of Example 6 was sprayed in the test section at a frequency of once every two weeks at about 100 mL per 1 m 2  with a spray. As a result, insect damage due to  Plutella xylostella  larvae,  Autographa nigrisigna  larvae and  Pieris rapae  larvae was found on the broccoli leaves during the growing period in the control section, but otherwise for the broccoli leaves in the test section due to these pests. In addition, drug-induced suffering did not occur in the broccoli grown in the test section.  
      As is clear from the results of Experimental Examples 1-8, farnesylacetone shows a control effect on a wide range of pests. As shown in the results of Experimental Example 1, the repellent effect of the DEET treated wire net bag on  Culex pipiens  decreases with time, but the repellent effect of the farnesylacetone treated wire net bag on the mosquitoes was maintained at a high level even after 18 hr after the start of the test. As shown in the results of Experimental Example 2, the paper sheet treated with farnesylacetone maintained a  Blattella germanica  control effect for at least 2 weeks, which indicates that the pest controlling effect of farnesylacetone is maintained for a long time. Moreover, as shown in the results of Experimental Examples 7-8, farnesylacetone does not cause a drug-induced suffering on crops.  
     Example 7  
      A dog raised in a dog kennel (vaporization area expanding means), the inside of which was sprayed every week with a 1% solution of farnesylacetone in ethanol with a spray container (reservoir means), and a dog raised in a dog kennel, the inside of which was sprayed every week with ethanol alone, were observed and compared for their behaviors for 30 min every day for one week. The dog raised in the farnesylacetone treated dog kennel scratched its body twice a day, but the dog raised in the dog kennel free of farnesylacetone treatment scratched its body 13 times a day. The concentration of farnesylacetone in the dog kennel was not more than 1 μg/L (detection limit). It is assumed that the fleas parasitic in dogs were repelled and decreased by farnesylacetone.  
     Example 8  
      A dispersion phase obtained by dissolving farnesylacetone (2 g) and polyacetate (10 g, manufactured by Cargill Dow LLC, number average molecular weight 87,000, weight average molecular weight 163,300, D/L ratio 8/92) in dichloromethane (100 mL) and a continuous phase consisting of 4% aqueous polyvinyl alcohol solution (1400 mL) and a surfactant (Q12S) (10.4 g) were mixed, stirred at a rate of 100 rpm on a propeller stirrer at 30° C. for 30 min The level of reduced pressure in the reaction vessel was raised stepwisely, and the mixture was stirred for 6 hr under reduced pressure created by an aspirator to evaporate dichloromethane. The obtained suspension was passed through a glass filter, the resultant was washed with water several times, and lyophilized for one day to give a microcapsule including farnesylacetone. The obtained microcapsule was an about spherical particle having an average particle size of 0.4 mm and showed dry flowability similar to the grain of sand.  
     Example 9  
      Polyvinyl acetate (5 g) and farnesylacetone (10 g) were dissolved in methanol (300 mL) and porous silica powder (100 g) was added to the solution. Methanol was removed with a rotary evaporator and, after outflow of methanol stopped, the rotary evaporator was operated at 40° C., 20 mmHg for 1 hr, whereby an aggregated silica solid coated with polyvinyl acetate, which contains farnesylacetone inside and surface thereof was prepared. This agglomerate was collected and pulverized, and a small amount of talc was adhered to the surface thereof to give a silica particle retaining farnesylacetone, which had a particle size of not more than 1 mm.  
     Example 10  
      By an operation similar to that in Example 9 except that phytone (10 g) was used instead of farnesylacetone (10 g), a silica particle retaining phytone, which had a particle size of not more than 1 mm was obtained.  
     Example 11  
      Monodisperse silica particles having an average particle diameter of 0.045 μm (Snowtex OL manufactured by NISSAN CHEMICAL INDUSTRIES, LTD.) were diluted with water to give a slurry (600 g) having a solid content of 17%. Thereto was added polyvinyl alcohol (PVA 117, 2 g, manufactured by KURARAY CO. LTD.) as a binder dissolved in water (20 g) and the mixture was mixed thoroughly. The obtained slurry was spray dried with a spray dryer (L-8, manufactured by Ohkawarakakouki CO., Ltd.) to give an agglomerate having a particle size of about 20 μm. This was sintered at 450° C. for 1 hr to remove the binder to give a porous agglomerate (95 g) made of silica. The solution of phytone (20 g) and ethanol (80 mL) was added into a pear-shaped flask, and the above-mentioned porous agglomerate (80 g) was added. The pear-shaped flask was set on a rotary evaporator and rotated for 5 min at normal pressure. While gradually raising the level of reduced pressure and temperature, ethanol was removed by evaporation to give sand-like silica particles retaining phytone.  
     Experimental Example 9  
      The microcapsules obtained in Example 8 or silica particles obtained in Examples 9-11 and quartz sand were uniformly mixed at 1:7 and used as a treatment test sample. In a lower dish of a set of 90 mm diameter glass schale, the treatment test sample was spread on one side and quartz sand was spread on the other side, both in the thickness of about 1 mm, such that an about 5 mm groove was formed in the center, and water was absorbed suitably to give a treatment section and an untreated section. In the treated section and the untreated section were placed 3 sheets each of 8φ filter pieces as a feed, and 10 worker  Coptotermes formosanus  were released on the schale and raised in an incubator at a temperature of 28±2° C., humidity 70%. After a given time, the location of  Coptotermes formosanus  was observed, if they are on the treated section or the untreated section. This test was repeated three times, and repellence rate was calculated based on the integrated value of the three observation results. The test results are shown in Table 8. 
 
repellence rate={1−(number of the ants in treated section/total number of the ants)}×100 (%) 
 
                       TABLE 8                                      days of observation                                         One day   2 days   4 days           sample   later   later   later                                                 Microcapsule of   87%   83%   90%           Example 8           Silica particle   100%   100%   100%           of Example 9           Silica particle   70%   73%   83%           of Example 10           Silica particle   100%   100%   100%           of Example 11                      
 
     Example 12  
      Farnesylacetone (10 g) was mixed with a soft acrylic resin powder (100 g, product name Parapet SA-N, manufactured by KURARAY CO. LTD.) and the mixture was allowed to blend at room temperature for 15 min The mixture was melt-kneaded in a twin roll kneader at 125° C. for 1 min and press-formed at 135° C. and 50 kg/cm 2  for 1 min to give a 0.5 mm thick soft rubber sheet (corresponding to the reservoir means and the vaporization area expanding means in the present invention). This sheet was cut into 1 cm wide tapes and adhered under a refrigerator and a floor-wall junction in a residence. As a result, cockroaches ceased to appear in a room containing the tape. The room containing this tape had an odor of farnesylacetone, which was smelled particularly after outing, but after getting used to it, the smell was of the level free of any particular problems.  
     Industrial Applicability  
      According to the method of the present invention, by maintaining the concentration of compound (I) within a particular concentration range in a space where pest repellence is intended, pests can be effectively controlled. Moreover, the agent of the present invention can provide a pest controlling effect on various articles.  
      This application is based on patent application Nos. 31409/2002 and 34625/2002 filed in Japan, the contents of which are all hereby incorporated by reference.