LU85123A1 - PHOSPHITE-BASED FUNGICIDAL COMPOSITIONS - Google Patents

Description

t. J

The present invention relates to new compositions for the protection of plants against fungal diseases and in particular these compositions containing as active materials a fungicide of the phosphite type and 5 l (2-cyano-2 methoxyiminoacetyl) -3-ethyl urea.

It is known to use systemic fungicides to protect plants from fungal diseases. There is in particular phosethyl-Al, common name for tris ", aluminum O-ethylphosphonate or aluminum ethyl phosphite, used for the protection of the vine and other plants against Phycomycetes. This product has a remarkable action in preventive treatment and a curative activity secondary to its normal dose of use. It is usually used in admixture with contact fungicides.

In addition, another fungicide is used, 1- (2-cyano-2-methoxyiminoacetyl) -3-ethylurle or cymoxanil of limited systemic action and having a secondary curative action. This product is generally used on.

20 Phycomycetes mixed with a contact fungicide to improve its persistence.

It has now surprisingly been found that · if phosethyl Al or certain of its homologous derivatives are combined with cymoxanil, the mixtures have a remarkable synergistic, in particular curative, action which allows a new application of these active materials.

* · More particularly the invention concerned a fungicidal composition based on a mixture of active ingredients, one of which is of the phosphite type, characterized in that it contains at least; -A) a compound of formula:

H

f - n +

(R - P - 0) M

U n 0 35 in which: / 7 1. 2 R is an OH or an alkyl of 2 to 4 carbon atoms, or an alkoxyl of 2 to 4 carbon atoms.

H is a hydrogen atom (only when R is itself a hydroxyl radical) or an alkali or alkaline earth metal or aluminum atom, * -and B) la 1 (2-cyano-2-methoxyiminoacetyl) - 3-ethylurea.

Among the compounds A, mono and disodium phosphites, sodium, calcium and aluminum ethyl phosphites are preferred. In addition, the B / A weight ratio is advantageously between 1/100 and 20/100 and preferably between 2/100 and 10/100; the compositions according to the invention can also comprise other active ingredients, in general from one to three contact fungicides chosen from the group comprising antimicrobial agents such as cap-tafol, folpel, maneb, zineb, mancozeb, mietiram zinc (complex of zineb and polyethylene thiuram disulphide) or even fungicides active against other diseases such as botrytis, excoriosis etc ...

The mixtures according to the invention can be prepared in ready-to-use formula or mixed extemporaneously.

The following example, given without limitation, illustrates the invention and shows how it can be put into practice.

25 SaefflÉi®

A mixture of phosethyl-Al and cymoxanil is prepared in a B / A ratio = 6/100

This mixture thus formulated is used ^ t \ on on Vine Plants in a greenhouse <£ * £! & £ - 3 0 ffle.n.t ... curative).

Vine plants (Chardonay grape), grown in pots are treated on both sides of their leaves by spraying with an aqueous suspension, at the desired dilution, containing active ingredients to be tested, respectively phosethyl-Al alone , in the form of a wettable powder at 80% by weight of active material, cymoxanil alone in powder // *. »3 wettable, ready to use, 50% by weight of active material, and the mixture of the two wettable powders.

This suspension thus formed is diluted, respectively once and twice, with water to obtain three spray emulsions of desired concentration of active ingredients to be tested. Spraying is carried out. under conditions such that the spraying of a suspension of concentration equal to 1 g / 1 corresponds to the application of approximately 2 micrograms of active ingredients per 2 10 cm of leaf surface of the plant.

Two suspensions are prepared in the same way in each case, each containing one of the active materials A and B at the concentration at which they are in the mixture.

15 A few (n = 1 to 3 days) days before the spraying of active ingredients, the plants were contaminated by spraying, on the underside of the 3 leaves, an aqueous suspension of approximately 80,000 units / cm of spores responsible for 20 downy mildew in the vine. Then, the pots were placed for 48 hours in an incubation cell at 100% relative humidity and at 20 ° C.

The plants are checked 9 days after contamination. The control is carried out by measuring the sporulated surfaces as a percentage relative to the control, the surface of which is completely sporulated.

The results are recorded in the following table: y 4

CURATIVE EFFECTIVENESS WITH PRODUCT TREATMENT DOSE n DAY (S) AFTER CONTAMINATION

9/1 ------------------------------------ 12 3 5 -------- ---------------------------------------------------------- 0.5 0 0 0 PHOSETHYL 1000 AL ----------------------------------------- ---- 10 2 70 35 0 0.03 15 15 0 CYMOXÄNIL 0.06 75 75 0 15 --------------------------- ------------------ 0.12 100 80 25 0.5 PHOSETHYL + 0.03 90 75 75 2 0 AL + ----------- ---------------------------------- CYMOXANIL 1 + 0.06 97 95 85 2 '25 0.12 100 97 85 * 4 '

This table clearly shows that the curative activity of mixtures I three separate doses is greater than 30 much greater than the sum of that of phosethyl Al and cymoxanil taken separately. Cn obtains almost total protection again after 2 days and still good after 3 days, the constituents being in the latter case inactive when used separately.

This example shows the excellent fungicidal activity of the compositions according to the invention which can be used on different families of phytopathogenic fungi such as, for example, Phycomycetes, as a preventive or curative treatment.

For their use in practice, the mixtures according to the invention are generally not used alone.

Most often they are used in compositions which generally comprise, in addition to the active material, an inert support (or diluent) and / or a surfactant compatible with the active material.

These compositions are also part of the present invention. They usually contain from 0.001 to 95% by weight of active ingredient. Their surfactant content is generally between 0.1% and 20% by weight.

By the term "support", in the present description, on% - denotes an organic or mineral, natural or synthetic material, with which the active material is associated to facilitate its application on the plant, on seeds or on the ground. This support is therefore generally inert and it must be acceptable in agriculture, in particular on the treated plant. The support can be solid (clays, natural or synthetic silicates, silica, chalks, resins, waxes, solid fertilizers, etc.) or liquid (water, alcohols, ketones, petroleum fractions, aromatic or paraffinic hydrocarbons , chlorinated hydrocarbons, liquefied gases, etc.).

The surfactant can be an emulsifying, dispersing or wetting agent of ionic or nonionic type. Mention may be made, for example, of polyacrylic acid salts; salts of lignosulphonic acids, salts of phenolsulfonic or naphthalenesulfonic acids, polycondensates of ethylene oxide on fatty alcohols or, on fatty acids, on fatty amines or on substituted phenols (in particular alkylphenolrf or aryl - l '' · '· phenols or styrylphenol); salts of esters of 11 6 sulfosuccinic acids; derivatives of taurine (in particular alkyltaurates); phosphoric esters of polyoxyethylated alcohols or phenols. at least one surfactant is generally essential especially when the inert support is not soluble in water, and the vector agent for the application is water.

The compositions used in the invention can be in fairly diverse forms, solid or liquid.

As forms of solid compositions, mention may be made of powders for dusting or dispersion (with active ingredient content of up to 100%).

As forms of liquid compositions or intended to constitute liquid compositions during application, mention may be made of solutions, in particular water-soluble concentrates, emulsifiable concentrates, emulsions, concentrated suspensions, aerosols , wettable powders (or spray powder), pastes.

The emulsifiable or soluble emulsified concentrates most often comprise 10 to 80% of active material, the emulsions-2C ions or solutions ready for application containing, for their part, 0.001 to 20% of active material. In addition to the solvent, emulsifiable concentrates can contain, when necessary, 2 to 20% of suitable additives, such as stabilizers, surfactants, penetrating agents, corrosion inhibitors, colorants , adhesives.

From these concentrates, emulsions of any desired concentration can be obtained by dilution with water, which are particularly suitable for application to the leaves.

The concentrated suspensions, also applicable in spraying, are prepared so as to obtain a stable fluid product which does not deposit and they usually contain from 10 to 75% of active ingredients, from 0.5 to 15% of surfactants. s, from 0.1 to 10 "“% of thixotropic agents, from 0 to 10% of suitable additives, such as anti-foam agents, corrosion inhibitors, stabilizers, penetrating agents and adhesives and , as a carrier, water or an organic liquid in which the active ingredient is sparingly or not soluble: certain organic solids or mineral salts may be dissolved in the carrier to help prevent sedimentation. 'water.

Wettable powders (or spray powder) * are usually prepared so that they contain 20 to 95% of active ingredients, and they usually contain, in addition to the solid support, from 0 to 5% of an agent wetting, from 3 to 10% of a dispersing agent, and, when necessary, from 0 to 10% of one or more stabilizers and / or other additives, such as penetration agents, adhesives, or anti-caking agents, dyes, etc. ..

As an example, here are various compositions of wettable powders: - active material (mixture B / A at 6.5 / 100) 50% 20 - ethoxylated fatty alcohol (wetting agent) 2.5% - ethoxylated styrylphenol (dispersing agent) 5% - chalk (inert support) 42.5%

Another example of wettable powder has the following composition: • 25 - active ingredient (mixture 3 / A to 6.6 / 100) phosethyl-Al 50% * · cymoxanil 3.3% folpel 25% - ethoxylated fatty alcohol (wetting agent ) 5.7% „30 - ethoxylated styrylphenol (dispersing agent) 6%

In order to obtain these sprayable powders or wettable powders, the active material is intimately mixed in suitable mixers with the additional substances and is ground with mills or other suitable grinders. This gives spray powders whose wettability and suspension are advantageous Λ 8 can be suspended with water at any desired concentration and this suspension is usable - very advantageously in particular for application on plant leaves.

As has already been said, aqueous dispersions and emulsions, for example compositions obtained by diluting with water a wettable powder or an emulsifiable concentrate according to the invention, are included within the general scope of the present invention. The emulsions can be of the water-in-oil or oil-in-water type and can have a thick consistency like that of a "mayonnaise".

The granules intended to be placed on the ground are usually prepared so that they have dimensions of between 0.1 and 2 mm and they can be produced by agglomeration or impregnation. In general, the granules contain 0.5 to 25% of active ingredient and 0 to 10% of additives as stabilizers, slow release modifiers, binders and solvents.

2.0 The mixture according to the invention can also be used in the form of a powder for dusting, it is thus possible to use a composition comprising 50 g of active material and 950 g of talc; it is also possible to use a composition comprising 2 μg of active material, 10 g of finely divided silica and 70 g of talc; these constituents are mixed and ground and the mixture is applied by dusting.

The invention further relates to a method of treating plants that center phytopathogenic fungi.

This process is characterized in that it consists in applying to these plants an effective amount of a composition containing as active material a mixture according to the invention. By "effective amount" is meant an amount sufficient to allow control and destruction fungi present on these plants. The doses of use can however vary within wide limits according to the fungus to be combated, the type of crop, and the climatic conditions. zi ê

Claims (2)

1. Fungicidal composition based on a mixture of active material • one of which is of the phosphite type, characterized in that it contains at least: - A) a compound of formula; 10 H * - n + (R - P - 0) i-I M n 0 in which: R is an OH or an alkyl of 2 to 4 carbon atoms, or an alkoxyl of 2 to 4 carbon atoms. * M is a hydrogen atom (only when R is itself a hydroxyl radical) or an alkali or alkaline earth metal or aluminum-20 minium atom. n is an integer from 1 to 3 - and û) 1 (2-cyano-2-methoxyiminoacetyl) -3-ethylurea 2} -Composition according to claim 1, characterized in that the weight ratio of ß / A is between 1/100 and * 25 20/100, preferably between 2/100 and 10/100. 3) -Composition according to claim 1, characterized in ► that the compound A is aluminum tris-O-ethylphosphonate. 4) -Composition according to one of claims 1 S 3, characterized in that it further comprises a fungicide - 30 antimildi contact. 5) -Composition according to claim 4, characterized in that the contact fungicide is folpel. 6) -Composition according to claim 4, characterized in that the contact fungicide is captafol. 7) -Composition according to claim 4, characterized in that the contact fungicide is mancozëbe. S) -Composition according to claim 4, characterized in that the contact fungicide is based on copper. 9) -Proced! for treating plants against fungal diseases, characterized in that a composition according to one of claims 1 to 8 is applied to them. * 10) -Treatment method according to claim 9) f characterized in that it is applied after contamination of »plants with the fungus. Drawings: ........ pages pages of which ...... A ....... cover page ........ d ...... description pages .. ....... X ..... claim pages ........ A ...... descriptive abstract Luxembourg, le -g DEC. 1083 The agent: Me Ala ^^ k ^ ina ^ ^% * »