CH657505A5 - FUNGICIDAL COMPOSITION BASED ON A MIXTURE OF ACTIVE MATERIAL. - Google Patents

Description

The present invention relates to new compositions for the protection of plants against fungal diseases and in particular to compositions containing as active materials a fungicide of the phosphite type and the 1- (2-cyano-2-methoxyiminoacetyl) -3 ~ ethylurea.

It is known to use systemic fungicides to protect plants from fungal diseases. There is in particular phosethyl-Al, common name for aluminum tris-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.

Furthermore, another fungicide is used, 1- (2-cyano-2-meth-oxyiminoacetyl) -3-ethylurea or cymoxanil of limited systemic action and having a secondary curative action. This product is generally used on Phycomycetes in mixture with a contact fungicide to improve its persistence.

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

The object of the present invention is therefore the fungicidal composition defined in claim 1.

Among 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 antimildiou such as capta-fol, folpel, maneb, zinèbe, mancozeb , mietiram zinc (complex of zineb and polyethylene thiuram disulfide) or even fungicides active against other diseases such as bo-trytis, excoriosis, etc.

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

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

Example

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

This mixture thus formulated is used in vivo on Plasmopara viticola on vine plants in the greenhouse (curative treatment).

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, phosethyl Al alone, in powder form, respectively wettable to 80% by weight of active material, cymoxanil alone in wettable powder, ready to use, to 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 emulsions to be sprayed with the desired concentration of active materials to be tested. The 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 materials per cm 2 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.

A few (n = 1 to 3 days) days before spraying with active ingredients, the plants were contaminated by spraying, on the underside of the leaves, an aqueous suspension of approximately 80,000 units / cm 3 of Plasmopara spores viticola responsible for 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 spoiled.

The results are recorded in the following table:

Product

Dose g / 1

Curative efficacy with treatment n day (s) after contamination

1

2

3

Phosethyl AI

0.5

0

0

0

1

0

0

0

2

70

35

0

Cymoxanil

0.03

15

15

0

0.06

75

75

0

0.12.

100

80

25

Phosethyl AI +

Cymoxanil

0.5 +0.03

90

75

75

I

+0.06

97

95

85

2

0.12

100

97

85

5

10

15

20

25

30

35

40

45

50

55

60

65

3

657,505

This table clearly shows that the curative activity of mixtures with three separate doses is greater than very much greater than the sum of those of phosethyl Al and cymoxanil taken separately. Almost total protection is obtained 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 mixture according to the invention is generally not used alone. Most often it is 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, is meant an organic or mineral, natural or synthetic material, with which the active material is associated to facilitate its application to the plant, to seeds or to the soil. 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 salts of polyacrylic acids: salts of lignosulfonic acids, salts of phenosulfonic or naphthalene sulfonic acids, polycondensates of ethylene oxide on fatty alcohols or on fatty acids or on fatty amines or on substituted phenols (in particular alkylphenols or arylphenols or styryl-phenol); ester salts of sulfosuccinic acids; taurine derivatives (especially alkyltaurates); phosphoric esters of polyoxyethylated alcohols or phenols. The presence of 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 (to be kept in active materials 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, powders wettable (or spray powder), pasta.

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

From these concentrates, emulsions with 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 materials, from 0.5 to 15% of surfactants, from 0 , 1 to 10% of thixotropic agents, 0 to 10% of suitable additives, such as defoamers, corrosion inhibitors, stabilizers, penetrating agents and adhesives and, as support, water or 5 an organic liquid in which the active ingredient is sparingly or not very soluble: certain organic solids or mineral salts can be dissolved in the support to help prevent sedimentation or as antifreezes for water.

Wettable powders (or spray powder) are usually prepared in such a way that they contain 20 to 95% of active ingredients, and they usually contain, in addition to the solid support, 0 to 5% of a wetting agent , 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 penetrating agents, adhesives, or anti-caking agents , dyes, etc.

As an example, here are various compositions of wettable powders:

- active ingredient (mixture B / A at 6.5 / 100) 20 - ethoxylated fatty alcohol (wetting agent)

25

50% 2.5%

- ethoxylated styrylphenol (dispersing agent) 5%

- chalk (inert support) 42.5% Another example of a wettable powder with the following composition:

- active ingredient (mixture B / A at 6.6 / 100)

phosethyl Al 50%

cymoxanyl 3.3%

folpel 25%

- ethoxylated fatty alcohol (wetting agent) 5.7% 30 - ethoxylated styrylphenol (dispersing agent) 6%

To obtain these sprayable powders or wettable powders, the active material is intimately mixed in suitable mixers with the additional substances and ground with mills or other suitable crushers. This gives powders to be pul-veriser whose wettability and suspension are advantageous: they can be suspended with water at any desired concentration and this suspension can be used very advantageously in particular for the application on the leaves of plants.

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 in the general scope of the present invention . The emulsions can be of the water-in-oil or oil-in-water type and they 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 05 to 25% of active ingredient 50 and 0 to 10% of additives as stabilizers, slow release modifiers, binders and solvents.

The mixture according to the invention can also be used in the form of powder for dusting; one can thus use a composition comprising 50 g of active material and 950 g of talc; it is also possible to use a composition comprising 20 g of active material, 10 g of finely divided silica and 970 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 against phytopathogenic fungi. This process is ca-60 characterized in that it consists in applying a quantity to these plants. effective content of a composition containing as active material a mixture according to the invention. By "effective amount" means an amount sufficient to allow the control and destruction of the fungi present on these plants. The doses of use 65 can however vary within wide limits according to the fungus to be combated, the type of crop, and the climatic conditions.

R

Claims (10)

657,505 1. Fungicidal composition based on a mixture of active materials, one of which is a phosphite, characterized in that it contains at least: A) a compound of formula: H (R-P-0) „M" + W II 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 atom, n is an integer from I to 3, and B) 1- (2-cyano-2-methoxyiminoacetyl) -3-ethylurea. 2. Composition according to claim 1, characterized in that the weight ratio of B / A is between 1/100 and 20/100, preferably between 2/100 and 10/100. 2 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 to 3, characterized in that it further comprises an anti-mildew contact fungicide. 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 mancozeb. 8. Composition according to claim 4, characterized in that the contact fungicide is based on copper. 9. A method of treating plants against fungal diseases, characterized in that a composition is applied to them according to one of claims 1 to 8. 10. Treatment method according to claim 9, characterized in that it is applied after the contamination of the plants by the fungus or fungi.