PESTICIDAL ADJUVANTS

Abstract: Alkyl polyglycosides of general formula (1) are used as non-crystal-growth-promoting pesticidal adjuvants in aqueous particulate suspension pesticide formulations. The pesticide may be any pesticide which can be formulated as a particulate suspension, but is preferably a pesticide having a solubility in water of not more than 600 ppm. The invention is also particularly applicable to pesticides having a melting point of at least 55 DEG C.

Description: PESTICIDAL ADJUVANTS This invention relates to particulate suspensions of pesticides in water. It is well known to apply pesticides to crops in the form of an emulsion. However, in the preparation of pesticide emulsions, it is generally necessary to employ an organic solvent (for example, xylene) . Fears about the damage that such solvents can cause to the environment have prompted the search for other ways of formulating pesticides, which avoid or reduce the use of solvents. Additionally, some pesticides have only limited solubility in the solvenrs which are generally employed, so have to be formulated in another way. One way in which the use of organic solvents can be reduced, is by formulating pesticides as particulate suspensions, for example in an aqueous phase. However, in many cases, the biological efficacy of particulate suspensions of pesticidal actives is very low. It is conventional in order to raise the biological efficacy of such particulate suspensions to employ an adjuvant, which is thought to increase the biological availability of the pesticide. Typical adjuvants used for such purposes are surface active materials, such as alcohol ethoxylates, amine ethoxylates, ethylene oxide/propylene oxide block copolymers, alcohol sulphates, alkylaryl sulphonates, alkylsulphonates, alkylphenol ethoxylates, ester ethoxylates, castor oil ethoxylates or alkanolamides . Although the use of adjuvants is very effective in increasing the biological efficacy of pesticidal actives, their use in pesticidal formulations which are "one-pack" particulate suspensions generally gives rise to crystal growth (e.g., by means of Ostwald ripening) . Crystal growth can occur over the relatively short period of time for which a particulate suspension is stored before use. 2 Crystal growth by Ostwald ripening generally occurs when smaller crystals (which have a greater total area than larger crystals) dissolve in the continuous phase, and the active material is transported througn the continuous phase, to nucleation sites fsuch as the larger crystals) . In addition, aggregation effects can compound sedimentation m and non-homogeneity of the formulation, i.e., the crystals can "clump" together. Stability problems can also occur in a particulate suspension of a pesticide which does not require an ad uvant, if the formulation also comprises a second pesticide, and an adjuvant is added m order to increase the biological efficacy of the second pesticide. The second pesticide may be dissolved in an aqueous phase and/or dispersed in a non-aqueous phase, or present as a partic late suspension itself. The inherent instability to storage of particulate suspensions of pesticides formulated with adjuvants has meant that such particulate suspensions have to be used very soon after formulation, which is commercially unsatisfactory. Alternatively, the product and an adjuvant have to be provided separately in a twin-pack, or the use of commercial adjuvant in addition to the product has to be recommended, in orαer that the adjuvant can be mixed into the particulate suspension or spray tank shortly before it is used. However, it would be more convenient if a storage-stable one-pack formulation of adjuvant and product could be provided. It has now been discovered that when alkyl polyglycosides are employed as adjuvants for pesticidal compositions which are particulate suspensions, surprisingly their use does not cause significant crystal growth. By "alkylpolyglycoside" is meant a cnam of one or more saccharide units linked by σlycoside bonds whicn terminates m an alkyl group joined to the terminal saccharide unit by a glycoside - bonα. 3 WO-A-9803065 (Dow AgroSciences) discloses a process for preparing a storage-stable aqueous dispersion of microcapsules comprising a supersaturated solution or a supercooled melt of a water-insoluble material (such as a pesticide) . The dispersion is stabilised with a non-micellising surfactant, that is a surfactant which does not form micelles under the conditions used tc store the stabilised dispersion. There is no suggestion in the reference of the use of alkyl polyglycoside adjuvants. It has previously been known to use alkyl polyglycosides as adjuvants in the agricultural industry. For example, Henkel supplies alkyl polyglycoside adjuvants under the trade name Agrimul™, and Unque a supplies alkyl polyglycoside adjuvants under the trade name Atplus™. A number of references disclose the use of alkyl polyglycosides as adjuvants (or dispersing agents) for pesticides, for example US 4888325 (Henkel KgaA) and US Statutory Invention Regulation H224 (Malik et al . ) . DE-A-4229442 (Henkel KgaA) discloses the use of alkyl polyglycosides as biodegradable dispersants in the preparation of dye and pigment compositions. WO 93/22917 (Henkel Corp.) describes the addition of fatty alcohols to alkyl polyglycosides in order to improve wetting ability and the use of aliphatic monoglucosides as adjuvants. WO 98/09518 (Henkel Corp.) relates to the use of additives to improve the tactile and aesthetic properties of alkyl polyglycosides and to prevent their crystallising. However, it has not previously been realised that, alkyl polyglycosides can be employed as adjuvants without causing significant crystal growth of the product formulation. In accordance with the invention , there is provided the use of an alkyl polyglycoside of general formula [ 1 ] [1] in a formulation comprising an aqueous particulate suspension of at least one pesticide, as a non-crystal-growth-promotmg pesticidal adjuvant, wherein R is a C4-C 2 0 alkyl group n is from 1 to 10, and Y is H, C,-C 2 n alkyl, or a group of the formula (C α H 2α 0) 2 X, -S0 3 M, -P0 3 X 2 , -COCH 2 CH[S0 3 M]COOX, -COX, -(CH : ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycerol residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or C.-C 20 alkyl. R is preferably a C 8 -C.„ alkyl group, and n is preferably from 1 to 3. M may be, for example, H or an ammonium, substituted ammonium (e.g., ammonium substituted with from 1 to 4 Cι-C 6 alkyl groups) ammonium, sodium, potassium, or magnesium ion. Preferably, Y in formula 1 is H. The term "pesticide" as used herein means any substance which destroys or protects against pests, ( __.. e , harmful organisms, particularly organisms which are harmful to crops or plants) The term "pesticide" therefore encompasses insecticides, herbicides, fungicides and acaricioes. The pesticide may oe any pesticide which can be formulated as a particulate suspension. The invention is particularly applicable to pesticides having a solubility m water of not more tnan 600ppm, rore particularly not more tnan 150ppm, and most particularly not more tnan 50ppm. The invention s also particularly applicable to pesticides having a melting point of at least 55°C, more particularly at least 77°C, and most particularly at least 100°C. Suitable fungicidal, herbicidal and msecticidal materials having a melting point of at least 55°C and a solubility in water of not more than 600ppm are listed below. In the tables, the names and identifiers are taken from the Pesticide Manual, 11 th edition. Suitable fungicidal materials having a melting point of at least 55°C and a solubility m water of not more than 600ppm include the following: Fungicides amitroie (<ph4.2) azaconazole (<ph3) azoxystrobm benalaxvl benomyl bitertanol bromocunazole captafol captan carbenoazim carboxm chmomethionate chlorothalonil chlozo mate copper oxychloride cuprous oxide cyproconazoie cyprodmil dichlofluanid dichloroonen diclomezme dicloran diethofencarb difenoconazole dimethomorph diniconazole dmobuton dithianon dodemorph epoxiconazole ethirimol famoxaoone fenarimol fenbuconazole fenfuram fenpicloml fentin ferbam ferimzone fluazmam fludioxonil fluoroimide fluαumconazole flusulfamioe flutolanil flutriafol folpet fuberidazole furalaxvl hexacniorooenzene hexaconazole imibenconazole ipeonazole lprooione kresoxim-methyl ktu 3616 mancozeb maneb Mepaniovnm mepronn mercuric oxide Mercurcus chloride metconazoie methas ^ focarb Met rari myclobutaml nιc e Nitrctπai-isopropyl nuarimol bis (oimethyldithioc aroamate) ofurace cxme-copper Fungicides phthalide pencycuron Pentachloroonenol Promcvmidone propmeb probenazole αumoxvfe o Pyrimetha n pyriouticar m, 26 sulphur quintozene ssf-1 thiabendazoie tebuconazole Tecnazene thifluzamide Thiophanate-methyl thiram tolclofos-meth y l Tolylfluanid triadimefon triadimenol Triazoxide triforine triticonazole Vmclozolin zineb ziram and stro Di lunn analogues i.e., a compound of the formula [2] [2] where i n Rl is an aromatic or heteraromatic group, preferably a phenyl or substituted phenyl (in particular phenyl subst i tuted w i th 2-methylphenoxymethylene or 6- (2-cyanophenoxy ) pyrιmιdm-4-yloxy ) , R2 is H, or Cι-C 10 alkyl A is CH or N and B is 0 or NH. Part i cularly suitable strobilunn analogues include ( 2 [2- ( 3- tr i fluoromethyl) -5-chloro-2-pyrιdyloxymethyl ) phenyl] -2-methoxyιmmo- N-methylacetamide, kresoxim methyl, and azoxystrobm. Su i table msecticidal (or acaricidal) materials hav i ng a melt i ng po i nt of at least 55°C and a solubility m water of not more than βOOpp include the following :- Insect des/acaπcides abamectm acrmathrm (i/a) amitraz azmphos-methyl azocvclotin bensultao benzoximate (a) bifenthrm (i/a) bromopropylate buprofezin caroaryl carbofuran chmomethionat (a) chlordane chlorfenapvr (i/a) chlorfluazuron clofentezme (a) coumaphos crvolite cyfluthnn beta-cyfluthnn cyhexatm (a) cypermethrin alpha-cypermethrm beta-cypermethrin theta-cypermethrm d2341 (a) deltamethnn diafenthiuron (i/a) dicofol (a) dienochlor (a) diflubenzuron dimethylvmphos dmobuton (a) dpx-jw062/dpx- mp062 endosulfan (i/a) esfenvalerate etoxazole (a) fenazaqum (i/a) fenbutatm oxide (a) fenpyroximate (a) fentm (a) flpronil flucycloxuron (i/a) flufenoxuron (i/a) halofenozide gamma-hch heptachlor hexaflumuron hexathiazox (a) hydromethvlnon isoprocarb lufenuron (i/a) methiocarb (i/a) methoxvchlor novaluron pentachlorophenol phosmet pymetrozme pyridaben pyπdaphenthion (i/a) pyrimidifen (i/a) resmethnn rh-2485 rotenone spmosad sulfluramid szι-121 (a) tebufenozide tebufenpyrad (a) teflubenzuron tetrachlorvmohos tetradifon (a) tetramethnn thiodicarb tralomethrm triflumuron tπmethacarb xmc xylylcarb (I = insecticide A = acaricide (miticide) PGR = plant growth regulator) Suitable herbicidal materials having a melting point of at least 55°C and a solubility m water of not more than 600ppm include the following:- Herbicides ac 94,377 (pgr) aclonifen akh-7088 ametryn amioosulfuron asulam (<ph .82 ) atrazme azafenidm azimsulfuron bav foe 5043 benazolin benfluaralm bensulfuron-methvl oentazone benzcfenap bifenox biohenvl bro obutide bromofenoxim brcmoxynil butraxin butroxvdi butvlate cafenstrole chlomethoxvfen chlobomuron chloriαazon cnlonmurorn-ethvi | c -orotoiuron chlorsu ^ furon cn ^ orthai-oimethvi l cmcsu-furon cioαinaop-proparαvl SUBSTΓΓUTE SHEET (RULE 26) Herbicides clomeprop cloransuiam-methvl cyanzine cyclanilide (pgr) cyclosulfamuron 2, 4-d acid daimuron 2,4-db desmedipham desmetrvn diclobeml dichlorprop dichiorprop-p diclofop-methyl diflufemcar. dimefuron dimethmetrvn dinitramine dinoterb diphenamid dithiopyr diuron ethalfluralm ethametsulfuron- methyl ethofumesate ethoxysulfuron ethychlozate (pgr) etobenzanid fenozaprop-p-ethyl flamprop-m- isopropyl flamprop-m-methyl flumetralm (pgr) flumetsulam flumiclorac-pentyl fluometuron fluoroglycofen- ethyl flupoxam flupyrsulfuron- flurenol methvl-sodium fluridone flurochloridone fluroxypyr flurprimidol (pgr) flurtamone fluthiacet-metnvl fomesafen forchlorfenuron halosulf ron-methyl (pgr) haloxyfop imazamox lmazaqum imazosulfuron inabenfide (pgr) indanofan 4-indol-3-ylbutyrιc ioxynil isoproturon acid (pgr) isouron isoxaben isoxaflutole lenacil linuron mcpa mcpb mecoprop mefenacet mefluidide metazachlor methabenzthiazuron methasulfocarb methylαymron metobenzurcn (pgr) metobromuron metosula metsulfuron-methvl 2-(l- 2-(l- (2-naphthoxy) acetic naphthyl ) acetamide naphthyl ) acetic acid (pgr) (pgr) acid (pgr) naproanilide napropamide naptalam neburon norflurazon oryzalin oxadiargyl oxadiazon oxasulfuron oxyfluorfen paclobutrazol (pgr) pendimethalm pentachlorophenol pentancchlor pentoxazone phenmedipham n-phenylphthlamic picloram acid primisuluron-methyl prooiair. ne prohexaoione- calcium (pgr; prometon prometryr. propachlor propanil propaqu zafop propazme propnaπ. propyzamice prosulfuron pyraf lu en-ethyl pyrazcynate pyrazosulfuron- ethvl pyriput carb qumclorac αummerac αuizalcf OD-C rimsύl rcn si our or. sima me SUBSTΓΓUTE SHEET (RULE 26) Herbicides sulfentrazone simetryn sulcotrione sulfosulfuron terbumeton suifometuron-methyl thenylchlor terbuthylazme terbutrvn thifensulfuron- thiazopyr thidiazuron (pgr) methvl tribenuron-methyl tralkoxydim tπasulfuron trisulfuron-methyl triclopyr trietazme uniconazole florasulam Part i culary suitable fungicides are azoles or tr i azoles wh i ch contain a 1, 2, 4-trιazole group. In a particularly preferred embodiment, the pest i c i de i s qumoxyfen, cyproconazole, epoxiconazole, florasulam, fenazaqu , oryzal , i soxaben, glyphosate, (2 [2- (3-trιfluoromethyl ) -5-chloro-2- pyr i dyloxymethyl ) phenyl] -2-methoxyιmmo-N-methylacetamιde, ( N- [2- 3, 5-dιmethylphenoxy) -1-methylethyl] -6- (tertiary butyl ) -1,3,5- trιazme-2, 4-dιamme or a mixture of two or more thereof. Part i cularly preferred mixtures are mixtures of qumoxyfen and cyproconazole, mixtures of qumoxyfen and epox i conazole, and m i xtures of oryzalm, isoxaben and glyphosate. By "ad j uvant", is meant a substance which, when added to a formulat i on of a pesticide, increases its pestic i dal eff i cacy, for example by improving its biological availab i l i ty. Whether or not a substance is an adjuvant can eas i ly be determ i ned by one skilled in the art, by using known methods for test i ng b i ological efficacy of a pesticide. If the add i t i on of a substance to a pesticidal formulation increases the b i olog i cal eff i cacy of the pesticide, then that substance i s an ad j uvant. Part i cularly preferred ad j uvants in accordance with the present i nvent i on are those known by tne following trade names: Atplus 435, Atplus 263, At p lus 264, Atplus 450, Atplus 460, Atplus 469, Atplus * 473, Atplus ^ , agrimul PG2067 and Agrimul PG2069, or a m i xture of two or more thereof. 10 Agrimul PG2067 is a mixture of compounds of formula A and B where m is from 7 to 9. Agrimul PG2069 is a mixture of compounds of formula A and B where m is from 8 to 10. CH 2 (CH 2 )m CH, O [B] The Atplus surfactants are alkylpolysaccharide blends. In one embodiment, the adjuvant is present to enhance the biological efficacy of the pesticide which is in particulate form. However, the adjuvant may be present to enhance the activity of a further pesticide in the dispersion, which may not be a particulate suspension. Accordingly, in an alternative embodiment, said formulation additionally comprises a further pesticide, wherein said adjuvant is an adjuvant for said further pesticide. The further pesticide may be dispersed or dissolved in an aqueous cr non-aqueous phase, or itself formulated as a particulate suspension. The amount of adjuvant to be employed is generally from 0.5 to 10 parts by weight based on the total weight cf pesticide and 11 preferably from 1 to 3 parts by weight based the total we i ght of the pesticide component (s) of the composition. The amount of the pesticide for which the alkylpolyglycoside is an ad j uvan t is generally from 25 to 400 g/litre, preferably from 50 to 300 g/litre, based on the whole composition. The amount of add i t i onal pesticide present will generally be from 0 to 300 g/litre, preferably from 0 to 200 g/litre. The amount of ad j uvant to be employed based on the total compos i t i on is generally from 10 to 600 g/litre, preferably from 200 to 400 g/litre. Conditions for storage may be any conditions appropriate to the formulation, but will generally be ambient cond i t i ons. The formulation may include any suitable additives known in the art, for example, for example, antifreeze agents, surfactants e.g. an i on i c and nonionic surfactants, suspension aids ( e.g. cellulos i c suspens i on aids or xanthum gum suspensions ) , antifoams and b i oc i des. A number of preferred embodiments of the invention are described in the following Examples. Example 1 A particulate suspension of qumoxyfen and epoxiconazole was prepared as the following millbase: Millbase Product g/L Qu oxyfen 75.0 Epoxiconazole 125.0 Morwet D425 (anionic surfactant blend ) 10.0 5% Avicel CL611 (aq) (suspending aid ) 40.0 Foamas t er UDB (antifoam) 0.8 Water and erts in a.i.s 149.2 400.0 Atp l us 435 was t hen added the following postmill aαoition: 12 Postmill Additions Product g/L 5% Avicel CL611 (aq) 100.0 Atplus 435 375.0 2% Kelzan S (Xanthum gum suspension) + 1% Proxel GXL (biocide) _ 50.0 Propylene glycol (antifreeze) 75.0 Proxel GXL 0.5 Water Balance 1 litre Accordingly, the nominal composition was: g/L Quinoxyfen 75.0 Epoxiconazole 125.0 Morwet D425 10.0 Avicel CL611 7.0 Foamaster UDB 0, Atplus 435 375.0 Kelzan S 1.0 Proxel glycol 1.0 Propylene glycol 75.0 Water and inerts in a.i.s Balance 1 litre Samples of the formulation were stored in glass at various temperatures for up to 24 weeks. Particle size parameters were measured initially, at 4 weeks and at 24 weeks. The results are shown below in Table I: 13 TABLE I Storage Storage Particle Size Parameters Time Temp 10%< (μm) Median (μm) 90%< (μm) Span Sp SA (°C) (sq.m/g) Initial Ambient 0.39 1.73 6.79 3.70 6.5100 4 Weeks -10 0.34 1.78 8.28 4.45 7.0367 Daily -20/+5 0.35 1.69 8.15 4.61 7.0248 cycle Daily -5/+30 0.32 1.64 7.58 4.43 7.5011 cycle Ambient 0.36 1.74 7.98 4.38 6.8367 40 0.32 1.72 7.96 4.44 7.3592 24 Weeks -10 0.35 1.83 7.87 4.10 6.8840 Ambient 0.32 1.70 8.72 4.93 7.3639 30 0.34 1.79 12.26 6.67 6.9693 40 0.35 2.06 19.10 9.12 6.6016 S p S A = specific surface area It was found that no significant crystal growth took place. Example 2 A particulate suspension of quinoxyfen and epoxiconazole was prepared as in Example 1 with various surfactants employed as adjuvants, namely Atlox 4991, Ethomeen C-25, Pluronic 10500 and Atplus 435. Initial median particle size was 1.24 μm. Samples of the formulations were stored for two weeks at a - 5/30° C d aily cycle and at 40°C. The samples were inspected for signs of crystal growth after two weeks, and results are shown in Table II below: 1 4 TABLE I I Chemical Class Trade Name Supplier Microscope (x50) after storage (for 2 weeks) at -5/+30°C 40°C daily cycle Alcohol ethoxylate Atlox 4991 ICI 40um+ No growth needles Amine ethoxylate Etho een C-25 Akzo 40um+ 150um Ethylene oxide/ Pluronic 10500 BASF 40-50um hint of propylene oxide needles growth copolymer Alkylpolyglucoside Atplus 435 ICI No change No growth from initial particle size distribution The sample prepared with Atplus 435 was the only sample in which there was no crystal growth. Example 3 Samples of an epoxiconazole 500g/l suspension concentrate were separately tank mixed with Pluronic 10500 and Atplus 435 and were applied to wheat plants (Cv. Galahad) inoculated with Erysiphe graminis infection. The disease level was tested after 10 days treatment, and the results are shown in Table III below: TABLE III Epoxiconazole SC+ Disease level (%) No adjuvant 19 Pluronic 10500 <1.0 Atplus 435 <1.0 It can be seen that the biological efficacy of the formulation which included an adjuvant was significantly better than the formulation with no adjuvant. Furthermore, the alkyl polyglucoside adjuvant was found to be as effective as Pluronic 10500. 15 Example 4 The effect of various alkyl polyglucoside adjuvants was measured on the biological efficacy of epoxiconazole against Erysiphe graminis. A formulation comprising 500g/l epoxiconazole as a suspension concentrate was tank mixed with adjuvant at a ratio of 1:3 epoxiconazole : adjuvant . The disease level was measured 5 days after treatment. Results are shown in Table IV below: TABLE IV Epoxiconazole Disease level (%) SC + Atplus 435 3.1 Atplus 263 1.9 Atplus 264 2.9 Atplus 450 3.8 Atplus 460 3 Atplus 469 2.7 Atplus 473 4 Atplus 474 3.85 Agrimul PG2067 9.25 Agrimul PG2069 6.8 In the absence of adjuvant infection levels of 32% were obtained. Untreated plants showed infection levels of 37% five days after treatment. Example 5 Aqueous dispersion formulations of quinoxyfen, florasulam and fenazaquin were prepared with Atlox 4991 and Atplus 435 as surfactants as shown below: 1 6 % /w %w/ Quinoxyfen 53.5% suspension 12.5 12.5 Atlox 4991 27.0 0 Atplus 435 Water 45.6 45.6 1.5%w/w Kelzan + 0.2%w/w Proxel GXL ( aq ) 15.0 15.0 % / %w/w Florasulam 45% suspension 14.8 14.8 27.0 Atlox 4991 27.0 Atplus 435 43.2 43.2 Water 1.5%w/w Kelzan + 0.2%w/w ~ Proxel GXL ( aq ) 15.0 15.0 %w/ % / Fenazaquin 43% suspension 15.5 15.5 27.0 Atlox 4991 27.0 Atplus 435 42.5 42.5 Water 1.5%w/w Kelzan + 0.2%w/w Proxel GXL ( aq ) 15.0 15.0 The suspension levels were adjusted to give 6.67 %w/w active ingredient in each mixture. These samples were checked by microscopy after four weeks storage at various conditions. The results are shown in Table V below: 17 TABLE V Active Surfactant Microscope Appearance (x50) after 4 ingredient Weeks Storage at -5/+30 u C 40°C daily cycle Quinoxyfen Atlox 4991 Growth up to 40μm No growth Quinoxyfen Atplus 435 No growth No growth Florasulam Atlox 4991 Growth up to 12μm Growth up to 12μm Florasulam Atplus 435 No growth Trace of growth* Fenazaquin Atlox 4991 Growth up to 12μm Growth up to 12μm Fenazaquin Atplus 435 No growth Some growth up to 12μm - less than with Atlox 4991. Biological efficacy tests were not carried out. However, the use of Atplus 435 allows the above actives to be formulated with another active which is not readily biologically available without the use of an adjuvant, without promoting significant crystal growth. Example 6 A formulation of a mixture of oryzalin (240g/l) , isoxaben (40g/l) and glyphosate (120g/l) was prepared, with Agrimul PG2067 (lOOg/l) as an adjuvant for glyphosate (oryzalin and isoxaben do not require an adjuvant) . Oryzalin and isoxaben are present as aqueous particulate dispersions (and therefore are vulnerable to crystal growth) , and glyphosate is dissolved in the aqueous continuous phase (as its triisopropylamine salt) . Particle size analysis was carried out after 24 weeks at various conditions, and the results are shown below in Table VI: SUBSTΓΓUTE SHEET (RULE 26) TABLE VI Particle size (micron) Storage Storage Period Temperature Median 90%< 10%< °C Initial Ambient 1.31 3.93 0.24 24 Weeks -10 1.27 4.14 0.20 30 2.21 6.51 0.22 40 2.45 7.52 0.21 Example 7 A 10% formulation of (2 [2- (3-trifluoromethyl) -5-chloro-2- pyridyloxymethyl) phenyl] -2-methoxyimino-N-methylacetamide (referred to as Compound 3 below) was prepared as an emulsifiable concentrate and its activity against powdery mildew on cereals was compared with the activity of a 10% suspension concentrate of Compound [3] . The suspension concentrate formulation was significantly less active, although its activity was restored by the addition of a wetting adjuvant. It has been found in various screening tests that Pluronic 10500 gives an excellent adjuvant effect, and this was therefore used as a comparator. Example 8 Field trials were carried out using a one-pack probe suspension concentrate formulation containing 50g/l of Compound 3 and 150g/l Pluronic 10500. This formulation was compared with an emulsion concentrate formulation of compound 3, and with a suspension concentrate containing Atplus 435 as a direct replacement for Pluronic 10500. Compositions are shown in Table VII below. SUBSTΓΓUTE SHEET (RULE 26) 19 TABLE VII (amounts in grams) SC (no SC (10500) SC (Atp_us EC adjuvant) 435) Compound 3 50 50 50 100 Morwet D425 5 5 5 Pluronic 10500 5 5 5 Foamaster UDB 1.5 1.5 1.5 Propylene glycol 80 ~ Pluronic 10500 - 150 Atplus 435 - — 150 Kelzan 1.6 1.6 1.6 Avicel 9 9 9 Water to 1030 to 1030 to 1030 Solvesso 200 423 (aromatic solvent) N-methyl pyrrolidone 423 (solvent) Tensiofix B7453 — 54 It was found that all three formulations performed well in the f i eld, but storage at 40°C caused unacceptable crystal growth with the Pluronic 10500 formulations. Example 9 0 The formulations prepared in Example 8 were also tested for curat i ve and protective activity against Rust ( Puccinia recondita ) on w i nter wheat. The formulations comprising At p lus 435 and Pluron i c 10500 gave efficacy similar to the emulsion concentrate _-o formulation. Example 10 Small sub-samples of the field trial samples prepared for Example 8 were stored in glass vials at 40°C and at -10°C. The samples were evaluate d after three months storage using a Malvern Masters i zer to determine the median size, and by v i sual SUBSTΓΓUTE SHEET (RULE 26) 20 characterisation under the microscope. Results are shown in Table VII below: TABLE VII 3m at - 10 ° C 3m at 40 ° C 1 . 20μm 1 . 35μm 50g/l SC (no small angular crystals adjuvant) 1 . 43μm 16.14μm (ϋ) 50g/l SC large rhomboid + Pluronic 10500 or lozenge crystals 1 . 35μm 1.73μm ( iii ) 50g/l SC small angular crystals with + Atplus 435 a few larger crystals Example 11 Three formulations of the pesticide of N- [2-3,5- dimethylphenoxy) -1-methylethyl] -6- (tertiary butyl ) -1,3, 5-triazine- 2,4-diamine ( referred to below as Compound 6 ) as suspension concentrates in water were prepared with no added surfactant, 40 parts of Atplus 435 to 1 part Compound 6, and 40 parts of Tensiofix D03 ( an alcohol alkoxylate adjuvant) to 1 part Compound 6 respectively. The formulations had the following composition: SC concentrate: Compound 6 52g technical Morwet D-425 5g Morwet EFW ig Water to lOOg This was milled to approximately 1.5μm median. This concentrate was then mixed with adjuvants in following proportions and stored: SUBSTΓΓUTE SHEET (RULE 26) 21 Compounα 6 concentrate 5g Adjuvant 20g Water to lOOg Samples of the formulations were stored for 1 month at ambient temperature, 40°C and 54°C, and then tested for particle size change. Results are shown in Table IX below: TABLE IX Sample Storage Particle Size (μm) Microscopy Reference Temperature (°C) Median 90% Span < Initial SC 1.50 5.61 3.49 sample Ambient 1.55 4.98 2.96 OK. No significant crystal growth No added 40 1.56 5.26 3.13 OK. No significant surfactant crystal growth 54 1.41 4.07 2.60 OK. No significant crystal growth Ambient 1.36 3.88 2.58 OK. No significant crystal growth With Atplus 435 40 1.56 4.16 2.39 OK. No significant crystal growth 54 1.63 4.60 2.52 OK. No significant crystal growth Ambient 1.51 4.30 2.51 OK. No significant crystal growth with Tensiofix 40 2.03 5.65 2.48 OK. Larger crystals D03 (an alcohol apparent alkoxylate) 54 3.47 8.94 2.39 Very few agglomerates but larger crystals 22 Example 12 The formulations prepared m Example 11 were sprayed onto veronica persica (VERPE) veronica hederifolia (VERHE) and viola arvensis (VIOAR) at 0.8 and 3.2 g/ha with x % v/v adjuvant added to the spray tank water (sprayed at 2001/ha). The plants were assessed after 15 days for control of the weeds (expressed as % kill). Results are shown m Table X below: TABLE X Compound Rate of rate a.i Control Control Control /aα uvant adjuvant per ha of VERHE of VERPE of VIOAR Atplus 435 0.125% 0.8 13 1 26 0.25 0.8 10.5 0 19.5 0.375 0.8 8 6.5 40.5 0.125 3.2 21.5 6 46.5 0.25 3.2 13 4 48 0.375 3.2 14.5 9.8 52 Tensiofix 0.125% 0.8 7 0 24.5 D03 0.25 0.8 10 .5 27 0.375 0.8 6.5 0 31 0.125 3.2 16.5 3.5 58.5 0.25 3.2 16.5 16.5 57 0.375 3.2 14.5 18.5 53.5 It was found that Atplus 435 had a similar effect on biological efficacy as Tensiofix D03. No significant biological effect was coserved in the absence of aαjuvant at the rates snown in Table X. SUBSTΓΓUTE SHEET (RULE 26) 23 Example 13 Concentrates (suspensions in water) of cyproconazole and quinoxyfen were prepared separately as set out in (a) and (b) below via a wet milling (bead milling) process. These were then blended with the adjuvant (Atplus 435) and other components as set out in (c) below. (a) Cyproconazole concentrate 0 % / Water 33.6 5%w/w Avicel CL611 gel (+ 0.1% Proxel GXL) 10.0 Morwet D425 5.9 10%w/w Foamaster UDB 0.5 Propylene Glycol 5.0 Cyproconazole technical 45.0 (b) Quinoxyfen concentrate Ingredient %w/ Quinoxyfen 53.50 Propylene Glycol 5.30 Avicel CL611 0.53 Foamaster UDB 0.13 Kelzan S 0.08 Proxel GXL 0.12 Morwet D425 2.12 Water plus inerts in Quinoxyfen technical 38.22 5 (c) Concentration: 75g/l Quinoxyfen + 80g/l Cyproconazole Final composition %w/w Water 24.04 Propylene αlvcol 5.50 1.5%w/w Kelzan S qel (+ 0.2% Proxel GXL) 8.00 5%w/w Avicel CL-611 qel (+ 0.1% Proxel GXL) 10.00 Atplus 435 22.10 Foamaster UDB 1.00 53.5%w/w Quinoxyfen manufacturer's concentrate 12.96 45%w/w Cyproconazole post mill 16.40 Samples of the formulation were stored at various storage temperatures, and particle size parameters were measured, after two :0 and 16 weeks storage. Results are shown below in Table I: SUBSTΓΓUTE SHEET (RULE 26) 24 Table XI Storage Storage Temp Particle size parameters Time (°C) (weeks) d(v, 0.5) d(v, 0.1) d(v, 0.9) Span (μm) μm μm Initial Ambient 2.41 0.31 11.95 4.82 2 -10 1.59 0.28 6.39 3.85 daily -5/30 2.10 0.30 8.23 3.78 cycle daily -20/5 2.02 0.30 7.93 3.78 cycle 16 -10 2.04 0.29 8.9 4.22 30 1.84 0.28 8.46 4.45 40 1.98 0.29 8.61 4.20 Example 14 Formulations of cyproconazole (200g/l) were prepared as suspension concentrates in water, with and without Atplus 435 as an adjuvant. The biological activity of the formulations was tested against Erysiphe graminis tritici infection, and results are shown in Table XII below: % infection Cyproconazole SC alone 19.85 1:1 Cyproconazole SC + Atplus 435 0.90 1:3 Cyproconazole SC + Atplus 435 0.55 Untreated plants 20.00 It should be noted that biological activity of a suspension concentrate of quinoxyfen is not significantly increased by the addition of an adjuvant. Accordingly, the effect on the biological activity of cyproconazole only was tested. SUBSTΓΠΠΈ SHEET (RULE 26)

Claims: 25 CLAIMS 1. The use of an alkyl polyglycoside of general formula [1] [1] in a formulation comprising a particulate aqueous suspension of at least one pesticide, as a non-crystal-growth-promoting pesticidal adjuvant, wherein R is a C_)-C 2 o alkyl group n is from 1 to 10, and Y is H, C ! -C 2 o alkyl, or a group of the formula (C q H 2q O) z X, -S0 3 M, -P0 3 X 2 , -COCH 2 CH[S0 3 M]COOX, -COX, -(CH 2 ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycerol residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or Cι-C 2 o alkyl. 2. The use as claimed in claim 1, wherein the pesticide has a solubility in water of not more than 600ppm. 3. The use as claimed in claim 2, wherein the pesticide has a solubility in water of not more than 150ppm. 4. The use as claimed in claim 3, wherein the pesticide has a solubility in water of not more than 50ppm. SUBSTΓΓUTE SHEET (RULE 26) 2 6 5. The use as claimed in any one of the preceding claims, wherein the pesticide has a melting point of at least 55°C. 6. The use as claimed in any one of the preceding claims, wherein the pesticide has a melting point of at least 77°c. 7. The use as claimed in any one of the preceding claims, wherein the pesticide has a melting point of at least 100°C 8. The use as claimed in Claim 1, wherein the pesticide contains a 1, 2, -triazole group. 9. The use as claimed in any one of the preceding claims, wherein the pesticide is a compound of the formula [2] : [2] wherein Rl is an aromatic or heteraromatic group, R2 is H, or Ci-C-.o alkyl A is CH or N and B is 0 or NH. 10. The use as claimed in Claim 9, wherein Rl is phenyl or substituted phenyl. 11. The use as claimed in Claim 9, wherein the pesticide is (2 [2- (3-trifluoromethyl) -5-chloro-2-pyridyloxymethyl) phenyl] -2- methoxyimino-N-methylacetamide, kresoxim methyl, or azoxystrobin. 12. The use as claimed in Claim 1, wherein the pesticide is quinoxyfen, cyproconazole, epoxiconazole, florasulam, fenazaquin, oryzalin, isoxaben, glyphosate, (2 [2- (3- trifluoromethyl ) -5-chloro-2-pyridyloxymethyl ) phenyl] -2- SUBSTΓΓUTE SHEET (RULE 26) 27 methoxy i mmo-N-methylacetamide, N- [2-3, 5-dιmethylpnenoxy) -1- methylethyl] -6- (tertiary butyl) -1, 3, 5-trιazme-2, 4-dιamme, or a mixture of two or more thereof. 13. The use as claimed in Claim 12, wherein the pest i c i de i s a m i xture of quinoxyfen and epoxiconazole, a mixture of qu i noxyfen and cyproconazole, or a mixture of oryzalm, isoxaben and glyphosate. 14. The use as claimed in any one of the preceding claims, wherein sa i d formulation additionally comprises a further pesticide, wherein said ad j uvant is an adjuvant for said further pesticide. 15. The use as claimed in any one of the preceding claims, wherein n is from 1 to 3. 16. The use as claimed in any one of the preceding claims, wherein R is a C B -C 18 alkyl group. 17. The use as claimed in any one of the preceding claims, wherein Y is H. 18. The use as claimed in any one of the preceding claims, where i n the alkyl polyglucoside is Atplus 435, Atplus 263, Atplus 264, Atplus 450, Atplus 460, Atplus 469, Atplus 473, Atplus 474, Agr i mul PG2067 and Agrimul PG2069, or a mixture of two or more thereof. 19. The use as claimed in any one of the preceding claims, where i n the amount of said adjuvant is from 0.5 to 10 parts by weight per part by weight of the total pesticide in the composition. 20. The use as claimed in Claim 19, wherein the amount of sa i d ad j uvant is from 1 to 3 parts by weight per part by weight of- the total pesticide in the composition. 21. The use of an alkyl polyglycosiαe of general formula [1] [1] as a non-crystal-growth-promotmg pesticidal adjuvant in an aqueous particulate suspension pesticide formulation, comprising quinoxyfen; epoxiconazole; florasulam; fenazaquin; oryzalm, isoxaben glyphosate; (2 [2- (3-trιfluoromethyl) -5- chloro-2-pyrιdyloxymethyl ) phenyl ] -2-methoxyιmmo-N- methylacetamide; (N- [2-3, 5-dιmethylphenoxy) -1-methylethyl] -6- (tertiary butyl) -1, 3, 5-trιazme-2, 4-dιamιne, or a mixture of two or more thereof :- wherein R is a C<-C 2 o alkyl group n is from 1 to 10, and Y is H, C.-C 20 alkyl, or a group of the formula (C α H 2α O) z X, -S0 3 M, -P0 3 X : , -COCH 2 CH[SO,M]COOX, -COX, -(CH 2 ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycero residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or C!-C 20 alkyl. 22 The use of an al kyl polyglycoside of general formula [ 1 ] 29 tl] as a non-crystal-growth-promoting fungicidal adjuvant, in an aqueous particulate suspension formulation comprising quinoxyfen and cyproconazole, wherein R is a C_j-C 20 alkyl group n is from 1 to 10, and Y is H, Cι-C 20 alkyl, or a group of the formula (C q H 2q O) z X, -S0 3 M, -P0 3 X 2 , -COCH 2 CH[S0 3 M]COOX, -COX, -(CH 2 ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycerol residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or Cι-C 20 alkyl. 30 23. The use of an alkyl polyglycoside of general formula [1] [1] in a formulation comprising a particulate aqueous suspension of at least one pesticide, as a non-crystal-growth-promoting pesticidal adjuvant, wherein R is a C 4 -C 20 alkyl group n is from 1 to 10, and Y is H, Cι-C 20 alkyl, or a group of the formula (C q H 2q O) z X, -S0 3 M, -PO 3 .X 2 , -COCH 2 CH[S0 3 M]COOX, -COX, -(CH 2 ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycerol residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or Cι-C 20 alkyl but wherein said pesticide is not a mixture of quinoxyfen and cyproconazole . 24. A method of increasing the biological efficacy of a pesticidal active composition comprising a particulate aqueous suspension of at least one pesticide, whilst preventing unacceptable crystal growth in the composition, which method comprises incorporating in the composition an alkyl polyglycoside of general formula [1] 31 [1] as a non-crystal-growth-promoting pesticidal adjuvant, wherein R is a C<-C 20 alkyl group n is from 1 to 10 , and Y is H, C:-C 20 alkyl, or a group of the formula (C q H 2q O) z X, -S0 3 M, -P0 3 X 2 , -COCH 2 CH[SO 3 M]CO0X, -COX, -(CH 2 ) p COOX, -CH 2 CH 2 S0 3 M, -COOX, a quaternary ammonium derivative, or a glycerol residue, wherein z is from 1 to 50 p is from 1 to 20 q is from 2 to 4 M is H or a suitable counter-ion, and each X independently is H or Cι~C 20 alkyl. SUBSTΓΓUTE SHEET (RULE 26)

Inventors: BANKS GRAHAM, DIXON KEITH RODERICK, FOWLES ANDREW MARK, MULQUEEN PATRICK JOSEPH, BANKS, GRAHAM, DIXON, KEITH, RODERICK, FOWLES, ANDREW, MARK, MULQUEEN, PATRICK, JOSEPH
Applicants: BANKS GRAHAM, DIXON KEITH RODERICK, DOW AGROSCIENCES LLC, FOWLES ANDREW MARK, MULQUEEN PATRICK JOSEPH, BANKS, GRAHAM, DIXON, KEITH, RODERICK, FOWLES, ANDREW, MARK, MULQUEEN, PATRICK, JOSEPH
Application year: 1999
Main classification: A01N25
IPC codes: A01N25, A01N43