INSECTICIDAL AND MITICIDAL COMPOSITIONS

Abstract: The invention relates to an insecticidal and miticidal composition which contains as active ingredients 4-bromo-2-(4-chlorophenyl)-1-(ethoxymethyl)-5-(trifluoromethyl)pyrrole-3-carbonitrile in combination with one or more compounds selected from the group consisting of formamidine-type insecticidal and miticidal agents, organosulfur-type insecticidal and miticidal agents, thiocarbamate-type insecticidal and miticidal agents, phenisobromolate, pyrimidifen, milbemectin and dinitromethylheptylphenyl crotonate. The insecticidal and miticidal composition of the invention is effective against pests and mites having resistance to commercial insecticidal and miticidal agents.

Description: DESCRIPTION INSECTICIDAL AND MITICIDAL COMPOSITIONS FIELD OF THE INVENTION This invention relates to insecticidal and miticidal compositions which contain as active ingredi ¬ ents 4-bromo-2- (4-ch I oropheny I) -1- (ethoxymethy I) -5- (tr i fu I oro ethy I) pyr ro I e-3-carbon i tr i le (hereinafter referred to as ch I orfenapyr) in combination with a second insecticidal and miticidal i ngred i ent (s) which can be effectively applied especially in the agrohor- t i cu I tura I field. BACKGROUND OF THE INVENTION Cfolorfenapyr, which is an active ingredient of the insecticidal and miticidal composition of the inven ¬ tion, is known to be effective against insects such as Hemiptera pests such as leafhoppers {Do ltocepha I idae) , Lepidoptera pests such as diamond back moth {PI ute l la xy loste I la) , common cutworm {Spodoptera 11 tura) and apple leafminer {Phy I lonorycter ringonie l la) and Thysanoptera pests such as Thr ips pa /mi and yellow tea thrips { Sp i rtothr ips dorsa l is) and agrohort i cu I tura I pests such as mites such as two-spotted spider mite { Tetranychus urticae koch) , Kanzawa spider mite { Tetra- nychus kanzawa i kishida) and Aculops pe lekass i . The second active ingredient of the insecti ¬ cidal and miticidal composition of the invention i n- eludes one or more of the following compounds: 1) formamidine-type compounds such as 3-methy 1-1 , 5—b i s (2, 4-χy ly I) -1 , 3, 5-tr iazapenta-1 , 4—d i ene (ami traz) , N' - (2-methy l-4~ch I oropheny I ) -N, N-di ethy I- formamidine hydroch lor i de (Ch I orfenami di ne) and the like which are known as effective compounds against agro- horticultural pests such as Hemiptera insects and mites; 2) organosulfur-type compounds such as 2, 4, 5, 4' -tetrachlorodi pheny I sul fone (tet ad i fon) , p-ch I oropheny I p-ch I orobenzenesu I fonate (CPCBS) and the like which are known to be effective insecticidal and miticidal agents; 3) thi ocarbamate-type compounds such as S-4- phenoxybuty l-dimethy I thi ocarba ate (fenothi ocarb) and the like which are known to be effective against a wide spectrum of agrohort i cu I tura I pests; 4) isopropyl 4, 4' -di bromobenz i late (feniso- bromolate) which is known to be effective against insect and mite pests; 5) 5-chloro-N-{2-[2, 3-dimethy I -4- (2- ethoxyethy I) phenoxy] ethy I } -6-ethy I -4-pyr imi di nami ne (pyr imi di fen) which is known to be effective against Hemiptera and Lepidoptera insects and mites; 6) 3:7 mixture of (10E, 14E, 16E, 22Z) - (1R.4S.5' S, 6R, 6'R, 8R, 13R, 20R, 21R, 24S) -21 , 24-di hydroxy- 5' , 6' , 11, 13, 22-pentamethy I-3, 7, 19-tr ioxatetra- eye I o [15.6.1.1 8 .0 Z0 , 24]pentacosa-10, 14, 16,22- tetraene-6-sp i ro-2' -tetrahydropy an-2-one and (10E, 14E, 16E.22Z)-(1R, 4S, 5' S, 6R, 6' R, 8R, 13R, 20R, 21R, 24S) - 6'-ethyl-21, 24-d i hydroxy-5' ,11,13, 22-tetramethy I-3, 7, 19- tr i oxatetra-cyc lo[15.6.1.1 4 8 .0 , 24]pentacosa- 10, 14, 16, 22-tetraene-6-spi ro ~ 2' -tetrahydropyran-2-one (mi I bemect i n) which is known to be effective against agrohort i cu I tura I mites such as Tetranychi dae ; and 7) d i ni tropheno I -type compounds such as dinitromethylheptylphenyl crotonate [hereinafter re- ferred to as DPC (Dinocap)] which is known to be effec ¬ tive against agrohort i cu I tura I mites such as Tetra- nychidae and agrohort i cu I ura I pathogenic fungi such as powdery mi I dew. Although insecticidal and miticidal agents have been developed in order to control various pests such as agrohort i cu I tura I pests or hygienic pests and in practice have been used as a single or a mixed agent, pests which have acquired resistance against various agents have been appearing as a result of the repeated use of these agents. In particular, important economic pests in agrohort i cu I ture such as Tetranych i dae, which have a propensity to easily develop resistance against pestici- da I agents due to their ability to deposit large numbers of eggs and produce large numbers of generations which, themselves, require only a few days for development are of great concern. Resistance development in this pest family is also favored by a high mutation rate and frequent inbreeding, due to minimal migration. For these reasons, two-spotted spider mite Tetranychus urticae koch) , Kanzawa spider mite { Tetranychus kanzawa i k i shida) , Acu lops pe lekass i , and the like have acquired resistance, to some degree, against almost all existing pesticidal agents. Therefore, in order to prevent and control the damage caused by Tetranych i dae, development of a new insecticidal and miticidal agent which shows a high effect against Tetranych i dae which have acquired resistance against the conventional miticidal agents is high ly des i rab le. However, to obtain an insecticidal and miti ¬ cidal composition which shows no cross-resistance with existing insecticidal and miticidal agents, has no toxicity problems and has little negative impact on the environment, is extremely difficult. Therefore, a means to delay or prevent the development of resistant strains of pest species is always being sought. In order to apply an effective agent as long as possible, a rota ¬ tional application of agents with different mechanisms of action is adopted for good pest management practice. However, this approach does not necessarily give satisfactory pest control. Therefore, after a resistance problem has occurred, a counter easure to resistance by combining insecticidal and miticidal agents has been studied. However, a high synergistic action has not always been found. Eventhough, ch I orfenapyr , is a highly effec ¬ tive miticidal agent at present, it has been recently introduced to the agrochemi ca I market and, in time, may ultimately develop a resistance problem, as has happened with new pesticidal compounds so often in the past. Therefore, it is an object of this invention to provide an insecticidal and miticidal composition which demonstrates a high controlling effect even against Tetranychi dae which have acquired resistance against ch I orfenapyr. SUMMARY OF THE INVENTION In order to establish a countermeasure to a resistance problem in Tetrachychi dae against chlor- fenapyr before such a problem occurs, the synergistic action with the existing insecticidal, miticidal and fungicidal agents was studied using resistant species which have been artificially established in the labora ¬ tory by selecting Tetrachychi dae which have been treated with ch I orfenapyr. Thus, it has now been found that an insecticidal and miticidal composition which contains as active ingredients ch I orfenapyr in combination with one or more compounds specified in a select group of insec ¬ ticidal and miticidal ingredients shows a joint action or synergistic effect which could not be foreseen from each individual ingredient alone. Namely, the invention exists in the insecticidal and miticidal composition which contains as active ingredients chlorfenapyr in combination with one or more compounds selected from the group consisting of formamidine-type insecticidal and miticidal agents, organosulfur-type insecticidal and miticidal agents, th i ocarba ate-type insecticidal and miticidal agents, pheni sobromo I ate, pyrimidifen, milbe- ectin and dinitromethyl eptylphenyl crotonate (hereinafter referred to as Group A). DETAILED DESCRIPTION OF THE INVENTION Chlorfenapyr, which is an active ingredient of the insecticidal and miticidal composition of the inven ¬ tion, is a known compound (Japanese La id-open (Kokai) Patent Publication No. 104042/89). Compounds which are suitable for use as the second active ingredient in the composition of the invention such as one or more of the fo I I ow i ng compounds : 1) formamidine-type compounds, preferably amitraz end ch I orphena i d i ne ; 2) organosulfur-type compounds, preferably tetradifon and p-ch I oropheny I p-ch I orobenzenesu I fonate ; 3) th i ocarbamate-type compounds, preferably fenoth i ocarb ; 4) fen i sobromo I ate ; 5) pyr i m i d i fen ; 6) mi Ibemect i n and 7) dinitromethylheptylphenyl crotonate are all known compounds and are commercial products which are readily available. For the preparation of the insecticidal and miticidal composition of the invention, it is suitable to formulate as a wettable powder, aqueous concentrate, emulsion, liquid concentrate, sol (f I owab I e agent), powder, aerosol, or the like, by conventional methods such as admixing chlorfenapyr and one or more compounds of Group A with a suitable carrier and aux i I I i ar i es, such as emulsifiers, dispersants, stabilizers, suspend ¬ ing agents, penetrants, and the like. The content of the total active ingredients of the composition of the invention, expressed as weight/ weight %, is preferably in the range of about I -90% for wettable powder, aqueous concentrate, emulsion, liquid concentrate and sol formulations. The preferable con ¬ tent of total active ingredients is about 0.5-10% for powder formulations and about 0.01-2% for aerosol formu- I at ions. Carriers suitable for use in the insecticidal and miticidal compositions of the invention may be any solid or liquid carrier which is commonly used for an agrohort i cu I tura I composition. Various surfactants, stabilizers and other auxiliary ingredients may be used according to the necessity. In commercially useful formulations, the composition of the invention may also be present in a mixture with other active agents, for example various insecticidal, miticidal, fungicidal and herbicidal agents, plant growth regulators, repel lants, attractants, synergists and fertilizers and fragrances, in order to expand its applicability. The ratio of chlorfenapyr to the compound(s) of Group A in the insecticidal and miticidal composition of the invention is about 1 weight part of chlorfenapyr to about 0.01-100 weight parts, preferably about 0.1-20 weight parts, of a compound (s) of Group A. The insecticidal and miticidal composition of the invention is particularly effective for the control of Tetranych i dae such as two-spotted spider mite { Tetra ¬ nychus urt icae koch) , Tetranychus c innabar inus {bo i sduya I) , Kanzawa spider mite { Tetranychus Kanzawa / ' k ishida) , Tetran i chus vi ennens i s zacher, and the like. Advantageously, the insecticidal and miticidal composition of the invention shows not only a synergis ¬ tic miticidal effect against the above-mentioned Tetra- nychidae, but also demonstrates simultaneous control of troublesome pests such as leafroller moths { Tortri- c/ ' dae) , Carpos i ni dae, leafminer moths {Lyonet i i dae) , plant bugs {Pentatomi dae) , aphids {Aphi di dae) , leaf- hoppers {De Itoc ipha I i dae) , thrips { Thr ip / dae) , diamond back moths {Plute l la xyloste l la) , Mamestra brass icae, leaf beetles { Chrysome I i dae) , whiteflies {A leyrodi dae) and the like on important agronomic crops such as fruit trees, for example citrus, apple and pear; tea plants; vegetables and the like. Although the application amount of the compo ¬ sition of the invention may differ according to prevail ¬ ing conditions such as the population density, the kinds and cultivation form of the target crop the weather conditions, the manner of application, and the like, in general, the total amount of chlorfenapyr in combination with the compound (s) of Group A is about 0.1-1,000 g, preferably about 40-500 g, per 10 ares. In actual practice, the composition of the invention when in the form of a wettable powder, aqueous concentrate, emul ¬ sion, liquid concentrate, sol, or the like may be di ¬ luted with water and applied to the crop at an applica ¬ tion rate of about 100-700 liters per 10 ares. When the inventive composition is formulated as a powder or aerosol, the crop may be treated with the undiluted formu I at i on. The insecticidal and miticidal composition of the invention is further illustrated in the examples set forth hereinbelow. These examples are not intended to limit the scope of the invention. All parts are parts by weight. EXAMPLE 1 FORMULATION EXAMPLE 1 EMULSION Clorfenapyr 10 parts Amitraz 30 parts Xy I ene 25 parts Dimethyl formamide 20 parts Sorpol 3005X 15 parts (Polyoxyethy lene type surfactant manufactured by Toho Chemical Industry Co., Ltd., commer ¬ cial name) An emulsion is obtained by mixing homoge ¬ neously and dissolving the above-mentioned ingredients. EXAMPLE 2 FORMULATION EXAMPLE 2 WETTABLE POWDER Chlorfenapyr 10 parts Tetradifon 10 parts Carplex #80 20 parts (White carbon manufactured by Shionogi & Co., Ltd, commercial name) Zeekl i te SP 52 parts (Mixture of kaolinite and cericite manufac- tured by Zeekl ite Ind. , commercial name) Calcium I i gni nsu I fonate 8 parts A wettable powder is obtained by homogeneously mixing the above-mentioned ingredients by jet air mill. EXAMPLE 3 FORMULATION EXAMPLE 3 SOL (FLOWABLE AGENT) Chlorfenapyr 5 parts Fenothiocarb 25 parts Ethylene glycol 8 parts Sorpol AC3020 5 parts (Toho Chemical Ind. Co., Ltd., commercial name) Xanthan gum 0.1 parts Water 56.9 parts Chlorfenapyr, fenothiocarb and a previously prepared mixture of ethylene glycol, Sorpol AC3020 and xanthan gum are well mixed in water and dispersed. This slurry is then wet pulverized by Dyno ill (Shinmaru Enterprises) to obtain a sol (flowable agent). Each of the above-prepared formulations is suitable to be used as an agrochemi ca I . EXAMPLE 4 TEST EXAMPLE I In this experiment, the miticidal effect against female imagines (adults) of Kanzawa spider mite { Tetranychus kanzawa i kishida) which are registrant to chlorfenapyr is evaluated. Round leaf disks (2 cm diameter) are cut out of a first leaf of kidney bean by a leaf punch and 4 sheets of the disks are placed on wet sanitary cotton in a plastic cup (8 cm diameter). On each leaf disk, 4 female imagines of Kanzawa spider mite { Tetranychus kanzawa i kishida) which had acquired a strong resistance to chlorfenapyr are inoculated. After the inoculation, chlorfenapyr and a compound(s) selected from group A are dispersed in water containing 200 pp of an extender (Sorpol 3005X) and diluted such that a predeter ined concentration of active ingredient is obtained. Each plastic cup is sprayed with 3.5 ml of a test solution with a rotary spray tower (Mizuho Scientific Co., Ltd.) and stored in a constant temperature chamber held at 25±1°C (32 individuals are tested per concentration, 4-5 concentra- tions are evaluated per formulation, and 2 performances were repeated). Two days after treatment, the number of living and dead female imagines of Kanzawa spider mite { Tetranychus kanzawa i k ishida) which had acquired a strong resistance to chlorfenapyr is counted and the mortality (%) is calculated according the formula shown hereinbelow. Mortality (%) = Number of dead mite x 100 Number of a I i ved mite + Number of dead mite Using these data, the LC 50 values are obtained by conventional probit analysis techniques. A co-toxi ¬ city coefficient is calculated by applying Sun and Johnson's formula (J. Econ. Ent. , Vo I 53, p. 887, 1980) which is generally used to determine the degree of synergistic activity. The LC 50 value of each individual effective ingredient which constitutes the insecticidal and miti- c i da I composition of the invention is shown in Table I. The LC 50 values and the co-toxicity coefficients of the composition of the invention are shown in Table II. Co-toxicity coefficient = T c Actual toxicity index of mixture T c = 1 x 100 Theoretical toxicity index of mixture For T values greater than 100, the greater value indicates a stronger synergistic action. For a T value equal to 100, an additive action is indicated. For T values less than 100, the lesser value indicates a greater antagonistic action. A more detailed descrip- tion of the calculation of the co-toxicity coefficient using the above-referenced Sun and Johnson formula fo I I ows. The LC 50 values of Test Compound A alone and Test Compound B alone and the LC 50 value of the (A + B) mixture M is determined. Actual toxicity index of mixture M = M Each LC 50 value of effective ingredient A and effective ingredient B and the LC 50 value of the mixture of A + B are used to determine the actual toxicity index as shown in the equation below. t i LC.- n of A M t = 2 x 00 LC 50 of M Theoretical toxicity index of mixture M = Th. M Th. M = (Toxicity index of A x %A in M + Toxicity index of B x %B in M) Toxicity index of B = B Toxicity index of A = A A t! = 100 TABLE I Evaluation Of The Effect Of Test Compounds Against Female Imago Of Kanzawa Spider Mite Which Have Acquired Resistance Against Chlorfenapyr TEST COMPOUND LC 50 (ppm) Ch I orfenapyr 1500 Ami traz 200 Tetradi fon 4900 Kelthane (Dicofo I) 32 * Pheni sobroma I ate 280 Fenoth i ocarb 1000 Pyr imi di fen 10 Avermect i ns 0.13 Mi Ibemect i n 0.28 Bi napacry I 180 DPC 630 * 2, 4-d i n i tro-6-sec-buty I pheny I d i methy I- acry I ate By comparison, the LC 50 value for chlorfenapyr against a susceptible strain of Kanzawa spider mite is about 5 ppm. As can be seen from the data on Table I, the resistant strain of Kanzawa spider mite which was ob ¬ tained by a long artificial selection procedure against chlorfenapyr in a laboratory on a colony of Kanzawa spider mite which had been collected in the field, has developed about a 300-fold resistance to chlorfenapyr. In the case of amitraz, phen i sobromo late, Bi napacry I and DPC, this Kanzawa spider mite is thought to originate from a colony which had acquired resistance to these insecticidal and miticidal agents prior to the time of collection in the field. These compounds all showed low effects. The test compounds: Kelthane (dicofol), pyri ¬ midifen, avermectins and milbemectin all demonstrate a high miticidal effect in this experiment. The test compounds tetradifon and fenothiocarb demonstrate a low miticidal effect in this experiment. TABLE I I Evaluation Of The Effect Of Test Mixtures Against Female Imago Of Kanzawa Spider Mite Which Have Acquired Resistance Against Chlorfenapyr u 50 TEST MIXTURE RATIO 1 ppm) τ u Chlorfenapyr + Amitraz 5 64 370 Chlorfenapyr + Tetradifon 3.2 72 4400 Chlorfenapyr + Kelthane 5.3 34 110 Chlorfenapyr + Phen i sobromo I ate 6 97 330 Chlorfenapyr + Fenothiocarb 10 270 380 Chlorfenapyr + Pyrimidifen 4 5 4.0 450 Chlorfenapyr + Avermectins 5 1 0.56 140 Chlorfenapyr + Milbemectin 5 1 0.75 220 Chlorfenapyr + Binapacryl 1 10 150 130 Chlorfenapyr + DPC 5: 12 140 540 Chlorfenapyr : Second active Ingredient T - Co-toxicity Coefficient As can be seen from the data on Table II, the co-toxicity coefficient of each of the test mixtures containing chlorfenapyr in combination with either amitraz or tetradifon or phen i sobromo I ate or fenthiocarb or pyrimidifen or milbemectin or DPC is a value s i gn i f i - cantly greater than 100, which is indicative of strong synergistic action.

Claims: CLA I S 1. An insecticidal and miticidal composition which contains as active ingredients chlorfenapyr in combination with one or more compounds selected from the group consisting of formamidine-type compounds, organo ¬ sulfur-type compounds, th i ocarbamate-type compounds, pheni sobromolate, pyrimidifen, milbemectin and dinitromethylheptylphenyl crotonate. 2. The composition according to claim 1 wherein the active ingredients comprise chlorfenapyr in combination with one or more forma idine-type compounds. 3. The composition according to claim 2 wherein the formamidine-type compound is amitraz or chlorphen- ami d i ne. 4. The composition according to claim 1 wherein the active ingredients comprise chlorfenapyr in combination with one or more organosulfur-type compounds. 5. The composition according to claim 4 wherein the organosulfur-type compound is tetradifon or p- ch I oropheny I p-chlorobenzenesulfonate. 6. The composition according to claim 1 wherein the active ingredients comprise chlorfenapyr in combination with one or more th i ocarbamate-type compounds. 7. The composition according to claim 6 wherein th i ocarbamate-type compound is fenothiocarb. 8. The composition according to claim 1 wherein the active ingredients comprise chlorfenapyr in combination with one or more compounds selected from the group consisting of phen i sobromo I ate, pyrimidifen, milbemectin and dinitrometh lheptylphenyl crotonate. 9. The composition according to claim 1 wherein the chlorfenapyr is present in a ratio of about 1 wei ht part to about 0.01 - 100 total weight parts of one or more compounds selected from the group consisting of amitraz, ch I orphenami d i ne, tetradifon, p-ch I oropheny I p-ch I orobenzensu I fonate, fenthiocarb, pheni sobromo I ate, pyrimidifen, mi lbemectin and dinitromethylheptylphenyl crotonate. 10. A process for the preparation of a composition of claim 1 which comprises admixing the active ingredi ¬ ents with an agrohort i cu I tura I I y acceptable solid or I i qu i d car r i er.

Inventors: FUKUCHI TOSHIKI, FUKUCHI, TOSHIKI
Applicants: AMERICAN CYANAMID CO, FUKUCHI TOSHIKI, AMERICAN CYANAMID COMPANY, FUKUCHI, TOSHIKI
Application year: 1997
Main classification: A01N43
IPC codes: A01N43