OA10486A - Insecticidal composition comprising a pyrethroid type compound - Google Patents

Description

010486 1

An insecticidal composition comprising a pyrrolidoid compound.

The present invention relates to an insecticidal composition comprising a pyrethroid type compound and a method employing this composition and intended to protect, as a curative or preventive, crops against insect attack.

All kinds of insecticidal compositions based on pyrethroids are known. Despite all the existing compositions, the control of cotton parasites, and particularly against the heliothis parasite, remains a difficult problem requiring large quantities of insecticides. However, it is undesirable, for all sorts of reasons and in particular for the protection of the environment, to lower the doses of insecticides to be used.

An object of the present invention is to provide active insecticidal compositions, especially on cotton pests.

Another object of the present invention is to provide high activity insecticidal compositions.

Another object of the present invention is to provide insecticidal compositions which make it possible to reduce the doses used, in particular reducing the doses of the constituents compared to those used when these constituents are used alone.

Another object of the present invention is to provide synergistic insecticidal compositions.

Another object of the present invention is to provide insecticidal compositions with reduced risks to the appearance of resistance to insects.

It has now been found that one (or more) of the above objectives can be achieved by the insecticidal composition according to the present invention.

The present invention therefore relates to an insecticidal composition comprising cypermethrin, triazophos and dimethoate. 010486 2

The present invention further relates to an insecticidal composition comprising cypermethrin, triazophos and dimethoate in synergistic proportions.

In the following, the various percentages given are percentages by weight unless otherwise indicated.

The present invention further relates to an insecticidal composition comprising cypermethrin, triazophos and dimethoate containing from 2 to 15% cypermethrin, preferably 5 to 10%, 25 to 45% triazophos, preferably 30 to 40%, at 65% of dimethoate, preferably 54 to 60%, these various percentages being percentages by weight with respect to all the insecticidal active substances.

Cypermethrin, triazophos and dimethoate are insecticidal materials that are well known in the literature, as regards their formula, their preparation process and their physicochemical properties.

The insecticidal compositions according to the invention comprise the active substances indicated above as well as solid or liquid substrates acceptable in agriculture and surfactants also acceptable in agriculture. In particular, it is possible to use the inert and conventional supports and the usual surfactants. These compositions cover not only the compositions ready to be applied to the crop to be treated by means of a suitable device, such as a spraying device, but also the commercial concentrated compositions which must be diluted before application to the crop. Abbreviation for Active Ingredient is the combination of the three activecypermethrin and triazophos and dimethoate materials.

The compositions of the invention may also contain any other ingredients such as, for example, protective colloids, adhesives, thickeners, thixotropic agents, penetrating agents, stabilizers, sequestering agents, etc. More generally Active Material can be combined with all solid or liquid additives corresponding to the usual techniques of formulation. In general, the compositions according to the invention usually contain from 0.05 to 95% (by weight) of Active Matter, one or more solid or liquid carriers and, optionally, one or more surfactants.

The term "carrier" in this specification refers to an organic or inorganic material, natural or synthetic, with which the Active Matter is combined to facilitate its application to the aerial parts of the plant.This carrier is therefore generally inert and must be acceptable. in agriculture, especially on the treated plant.The support can be solid (clays, natural or synthetic silicates, silica, resins, waxes, solid fertilizers, etc.) or liquid (water, alcohols, especially butanol etc ...). The surfactant may be an emulsifier, dispersant or wetting agent of ionic or nonionic type or a mixture of such surfactants, for example salts of polyacrylic acids, lignosulfonic acid desalts, salts of phenolsulphonic or naphthalenesulphonic acids, polycondensates of ethylene oxide with fatty alcohols or fatty acids or with fatty amines, substituted phenols (especially alkylphenols or arylphenols), salts of sulfosuccinic acid esters, taurine derivatives (especially alkyltaurates), phosphoric esters of polyoxyethylated alcohols or phenols, esters of fatty acids and polyols, functional derivatives sulfates, sulfonates and phosphates of the foregoing compounds. The presence of at least one surfactant is generally essential when the Active Matter and / or the inert carrier are not soluble in water and the application carrier is water.

Thus, the compositions for agricultural use according to the invention may contain the Active Material within very wide limits, ranging from 0.05% to 95% (by weight). Their surfactant content is advantageously between 5% and 40% by weight.

These compositions according to the invention are themselves in fairly diverse forms, solid or liquid.

As forms of solid compositions, mention may be made of granules, in particular those obtained by extrusion, by compacting, by impregnation of a granulated support, by granulation from a powder (the carbon content of the granules).

Active material in these granules being between 0.5 and 80% for thesecas), tablets or effervescent tablets.

The insecticidal composition according to the invention can also be used in the form of dusting powders; it is also possible to use a composition comprising 50 g of Active Matter and 950 g of talc; a composition comprising 20 g of active material, 10 g of finely divided silica and 970 g of talc can also be used; these constituents are mixed and ground and the mixture is applied by dusting.

As liquid compositions or compositions intended to constitute liquid compositions during application, mention may be made of solutions, in particular water-soluble concentrates, emulsions, concen- trated suspensions, aerosols, wettable powders (or powder for spraying). , pasta, gels.

The concentrated suspensions, applicable as sprays, areprepared in order to obtain a stable fluid product that does not deposit and usually contain from 10 to 75% of active matter, from 0.5 to 15% of surfactants, from 0.1 to 10% thixotropic agents, from 0 to 10% of suitable additives, such as antifoams, corrosion inhibitors, stabilizers, penetrating agents and adhesives and, as a carrier, water or a liquid organic in which the Active Matter is little or passoluble: some organic solids or mineral salts can be dissolved in the support to help prevent sedimentation or as antifreezes for water. For example, here is a concentrated suspension composition:

Example SC 1: - Active material - polyethoxylated tristyrylphenol phosphate - polyethoxylated alkylphenol polyphenoxylate - sodium polycarboxylate 500 g50 g50 g20 g50 g 010486 - organopolysiloxane oil (antifoam) - polysaccharide - water 1 g 1.5 g 316.5 g

Wettable powders (or spray powder) are usually prepared to contain 20 to 95% Active Matte, and usually contain, in addition to the solid carriers, from 0 to 30% of a wetting agent, from 3 to 20% a dispersing agent, and, when necessary, from 0.1 to 10% of one or more stabilizers and / or other additives, such as penetrating agents, adhesives, or conditioners, dyes, etc. .

In order to obtain the spraying powders or wettable powders, the active ingredients are intimately mixed in the appropriate mixers with the additional substances and milled with suitable mills or other crushers. Spray powders are thus obtained, the wettability and suspension of which are advantageous; they can be suspended with water at any desired concentration and these suspensions can be used very advantageously particularly for application to the leaves of plants. In place of the wettable powders, pasta can be made. The conditions and methods of production and use of these pastes are similar to those of wettable powders or spray powders. By way of example, here are various compositions of wettable powders (or powders for spraying):

Example PM 1 - Active material 50% - ethoxylated fatty alcohol (wetting agent) 2.5% - ethoxylated phenylethylphenol (dispersing agent) 5% - chalk (inert carrier) 42.5%

EXAMPLE PM 2: Active Ingredient 10% - oxo synthetic alcohol of branched type, in 6 010486 C13 ethoxylated with 8 to 10 ethylene oxide (wetting agent) - neutral calcium lignosulfonate (dispersing agent) - calcium carbonate (inert filler) 0.75% 12% qs 100%

Example PM 3:

This wettable powder contains the same ingredients as in the preceding example, in the following proportions: active material 75% wetting agent 1.50% dispersing agent 8% calcium carbonate (inert filler) q.s. 100%

Example PM 4: - 90% active matter - ethoxylated fatty alcohol (wetting agent) 4% - ethoxylated phenylethylphenol (dispersing agent) 6%

Example PM 5: - Active material 50% - mixture of anionic and nonionic surfactants (wetting agent) 2.5% - sodium lignosulfonate (dispersing agent) 5% - kaolinic clay (inert support) 42.5%

The aqueous dispersions and emulsions, for example the compositions obtained by diluting with water an emulsifiable wettable powder or concentrate according to the invention, are included in the regregénéral of the present invention. The emulsions may be of the water-in-oil or oil-in-water type and may have a thick consistency such as that of a "mayonnaise". 010486 7

The insecticidal compositions according to the invention may be formulated in the form of water-dispersible granules also included within the scope of the invention.

These dispersible granules, whose bulk density is generally between about 0.3 and 0.6, have a particle size of generally between about 150 and 2000 and preferably between 300 and 1500 microns.

The active material content of these granules is generally between about 1% and 90%, and preferably between 25% and 90%.

The remainder of the granule is essentially composed of a solid filler and possibly surfactant adjuvants imparting to the granule properties of dispersibility in water. These granules can essentially be of two distinct types depending on whether the retained filler is soluble or not in water. When the filler is water soluble, it may be mineral or, preferably, organic. Excellent results have been obtained with urea. In the case of an insoluble filler, it is preferably mineral, such as kaolin or bentonite. It is then advantageously accompanied by surfactants (in a proportion of 2 to 20% by weight of the granule) of which more than half is, for example, constituted by at least one dispersing agent, essentially anionic, such as an alkaline or alkaline polynaphthalenesulphonate. earth or an alkaline or alkaline-earth lignosulfonate, the remainder being constituted by non-ionic or anionic acid wetting agents, such as an alkaline or alkaline earth alkyl naphthalene sulphonate.

On the other hand, although not essential, other adjuvants such as antifoam agents may be added.

The granulate according to the invention can be prepared by mixing the necessary ingredients and then granulating according to several techniques in soionnues (dredger, fluid bed, atomizer, extrusion, etc ...). It is generally completed by crushing followed by sieving to the selected particle size within the limits mentioned above. Granules obtained as above and then impregnated with a composition containing the Active Matter can be further processed.

Preferably, it is obtained by extrusion, operating as indicated in the examples below. 8 010486

GDI Example: Dispersible granules

In a mixer, 90% by weight of material is mixed

Active and 10% urea beads. The mixture is then milled in a pin mill. A powder is obtained which is moistened with about 8% by weight of water. The wet powder is extruded in a perforated roll extruder. A granule is obtained which is dried, then crushed and sieved, so as to keep only the granules of a size between 150 and 2000 microns respectively.

Example GD2: Dispersible granules

In a mixer, the following constituents are mixed: - Active material 75% - wetting agent (sodium alkylnaphthalenesulphonate) 2% - dispersing agent (sodium polynaphthalenesulphonate) 8% - inert load insoluble in water (kaolin) 15%

This mixture is granulated in a fluid bed, in the presence of water, then dried, crushed and sieved so as to obtain granules with a size between 0.15 and 0.80 mm.

These granules can be used alone, in solution or dispersion in water so as to obtain the desired dose. They can also be used to prepare combinations with other active ingredients, especially insecticides, the latter being in the form of wettable powders, or aqueous granules or suspensions.

As regards the compositions suitable for storage and other transport, they more preferably contain from 0.5 to 95% (by weight) of Active Matter. The invention finally relates to a method of controlling, as a curative orpreventive, against insects injurious to cotton, characterized in that itappliques on the aerial parts of the plants an effective and nonphytotoxic amount of an insecticidal composition according to the invention. 010486 9

The insecticidal composition which is the subject of the invention is applied by means of various treatment methods such as the spraying on the aerial parts of the cultures to be treated with a liquid comprising the said composition.

By "effective and non-phytotoxic amount" is meant a quantity of composition according to the invention sufficient to allow the control or destruction of insects present or likely to appear on crops, and causing for said cultures no symptoms of phytotoxicity. Such a quantity is likely to vary within wide limits depending on the insect to be combated, the type of culture, the climatic conditions, and the compounds included in the insecticidal composition according to the invention. This quantity can be determined by systematic field tests, within the scope of the person skilled in the art.

The doses of use during the implementation of the process according to the invention will then, on cotton: * 10 to 50 g / ha of cypermethrin, preferably 20 to 40 g / ha and more preferably still 30 g / ha, * 100 at 200 g / ha of triazophos, preferably 120 to 180 g / ha and more preferably 150 g / ha, 200 to 300 g / ha of dimethoate, preferably 220 to 270 g / ha and more preferably 240 g / ha. The following example is given purely by way of illustration of the invention, and does not limit it in any way.

Example 1

On cotton leaves, larvae of Heliothis armigera are placed in the stadeconnu under the name of second stage.

Before putting these insects, the leaves are soaked in a solution comprising 4 g / l of a mixture in 1/5/8 weight proportions of the three active ingredients cypermethrin + triazophos + dimethoate, and then the leaves are dried. The larvae then being placed on the leaves, the larval mortality is observed after 48 hours. This mortality is 5% on the control leaves (which have been immersed in a solution without Active Matter) The treated leaves give rise to a mortality of 98%.

Claims (9)

11 010486 CLAIMS An insecticidal composition comprising a pyrrolidoid compound, triazophos and dimethoate. 2. An insecticidal composition according to claim 1 comprising cypermethrin, triazophos and dimethoate. 3. Composition according to claim 2 comprising lacypermethrin, triazophos and dimethoate in a proportion of 2 to 15% of cypermethrin, preferably 5 to 10%, 25 to 45% of triazophos, preferably 30 to 40%, 50 to 65%. % of dimethoate, preferably 54 to 60%, these various percentages being percentages by weight with respect to all the insecticidal active substances. 4. Composition according to one of the preceding claimscomprenant other ingredients such as, protective colloids, adhesives, thickeners, thixotropic agents, penetration agents, stabilizers, sequestering agents. 5. Composition according to one of the preceding claimscomprenant of 0.05 to 95% of active ingredients. 6. A method of protecting crops against insects comprising applying a composition according to one of the preceding claims. 7. Method according to one of the preceding claims wherein the insecticidal composition is applied to a cotton crop. 8. Method according to one of the preceding claims wherein the insecticidal composition is applied to an infested cotton crop or susceptible to be infested with the Heliothis parasite. 9. Method according to one of the preceding claims wherein the insecticidal composition is applied at a dose of: * 10 to 50 g / ha for cypermethrin, preferably 20 to 40 g / ha and more preferably still 30 g / ha, * 100 at 200 g / ha for triazophos, preferably 120 to 180 g / ha and even more preferably 150 g / ha, * 200 to 300 g / ha for dimethoate, preferably 220 to 270 g / ha and more preferably still 240 g / ha Ha.