FR2537395A1 - FUNGICIDAL COMPOSITIONS BASED ON PHOSPHITE - Google Patents

Abstract

1. FUNGICIDE COMPOSITION. 2. IT IS BASED ON A SYNERGIC MIXTURE OF ACTIVE MATERIALS INCLUDING AT LEAST: - A COMPOUND OF FORMULA: (CF DRAWING IN BOPI) WITH R OH, ALCOHOL (CC), ALCOXYL (CC), MH (SI R OH) , ALKALINE, ALKALINOTERREOUS METAL OR ALUMINUM, N 1 TO 3 - CYMOXANIL. 3. THIS COMPOSITION CAN BE USED FOR THE PROTECTION OF PLANTS AGAINST DISEASES, AS A PREVENTIVE OR CURATIVE TREATMENT.

Description

The present invention relates to novel compositions for

  plant protection against fungal diseases and in particular compositions containing as active ingredients a phosphite fungicide and 1 (2-cyano-2-methoxyiminoacetyl) -3-ethyl urea. It is known to use systemic fungicides to protect plants against fungal diseases. In particular, there is phosethyl-Al, a nonmal for aluminum tris-0-ethylphosphonate or aluminum ethylphosphite, used for the protection of the vine. and other plants against Phycomycetes This product has a remarkable action in preventive treatment and a secondary healing activity at its normal dose of use It is usually used in mixture with contact fungicides. In addition, another fungicide, 1- (2-cyano-2-methoxyiminoacetyl) -3-ethylurea or cymoxanil of limited systemic action and with a secondary curative action is used. This product is generally used on Phycomycetes mixed with a fungicide. contact for

improve its persistence.

  It has now been found, surprisingly, that if phosethyl A 1 or certain of its homologous derivatives are combined with cymoxanil, the mixtures have a remarkable synergistic action, notably a curative action which allows

  new application of these active ingredients.

  More particularly, the invention relates to a fungicidal agent 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: ## STR2 ## in which which R is an OH or an alkyl of 2 to 4 carbon atoms

  carbon, 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 metal or alkaline earth metal or aluminum atom,

  and B) 1 (2-cyano-2-methoxyiminoacetyl) -3-ethylurea.

  Among the compounds A mono and disodium phosphites, ethyl phosphites of sodium, calcium and aluminum are preferred In addition, the weight ratio B / A is preferably between 1/100 and 20/100 and preferably between 2/100 and 20/100. 100 and 10/100; the compositions according to the invention may further comprise other active ingredients, generally from one to three contact fungicides selected from the group consisting of antimildiou such as captafol, folpel, manebe, zineb, mancozeb, Zinc metiram (complex of zineb and polyethylene thiuram disulfide) or fungicides active against other diseases such as botrytis, excoriosis etc. The mixtures according to the invention can be prepared ready-to-use formula or mixed extemporaneously . The following example given by way of non-limiting example illustrates the invention and shows how it can be put

in practice.

Example

  A mixture of phosethyl-Al and cymoxanil in an E / A ratio of 6/100 is prepared. This mixture thus formulated is used in vivo on Plasmooara viticola on greenhouse vine plants.

(cure).

  Vine plants (Chardonay) grown in pots are treated on both sides of their leaves by spraying with an aqueous suspension.

2 '537395

  desired, containing active ingredients to be tested, respectivemilt the phoséthyl-Al only, in the form of wetland poultry 80% by weight of active material, cyuoxanil only in dry powder, ready for use, 30% by weight of material active, and mixing the two lockable powders. This suspension thus constituted is diluted, respectively one and two times, with water to obtain three emulsions to be sprayed with the desired concentration of active ingredients to be tested. Spraying is carried out under conditions such as the spraying of a suspension of concentration equal to 1 g / l corresponds to the application of approximately 2 micrograms of

  active per cm of leaf area of the plant.

  In the same way, two suspensions each containing one of the active ingredients A and B at the concentration at which they are found in each case are prepared in the same way.

The mixture.

  A few (n to 1 to 3 days) days before the spraying of active ingredients, the contamination of the plants was carried out by spraying, on the underside of the leaves, an aqueous suspension of 80 000 units / cm of Plasmopara viticola responsible for the downy mildew of the vine Then, the pots were placed for 48 hours in incubation cell at 100

relative humidity and at 20 C.

  The control of the plants is carried out-9 days after the contamination The control is carried out by measuring the sporulated surfaces in percentage relative to the control,

  whose surface is totally sporulated.

  The results are recorded in the following table:

  CURATIVE EFFICIENCY AVF C TRAIT 151 EZJT

  PRODUCT DOSE N JOU Rts) AFTER C O NTAIMINATION s i 2 3 PHOSETHYL i O O

2 70 35 O

0.03 15 15 O

CYM 4 OXANIL 0.06 75 75 O

ee

9.12 100 80 25

0.5

PHOSETHYL + 0.03 90 75 75.

  CYM 4 OXANIL i + 0.06 97 95 th 5 th th

2

0.12 100 97 85

  This table clearly shows that the curative activity of the mixtures with three distinct doses is greater than the sum of that of phosethyl Al and cymoxanil taken by a factor. Almost complete protection is obtained after 2 days and still good after 3 days, the constituents being in Crnier caz lnci where they are used

4 separate nt.

  This example shows the excellent fungicidal activity of the compositions according to the invention which can be used on the following families of phytouathogenic fungi such as, for example, Phyconycetes, as preventive or curative treatment. For their use in practice, the compounds

  according to the invention are generally not used alone.

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

  compatible with the active ingredient.

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

% in weight.

  By the term "support", in the present description, denotes an organic or inorganic material, natural or synthetic, with which the active ingredient is associated to facilitate its application to the plant, on seeds or on the ground This support 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, chalks, resins, waxes, solid fertilizers, etc.) or liquid (water, alcohols, ketones , petroleum fractions, aromatic or paraffinic hydrocarbons, chlorinated hydrocarbons, gases

liquefied, etc.).

  The surfactant may be an enor-

  For example, salts of polyacrylic acids may be mentioned, for example, ionic or nonionic dispersants or wetting agents; lignosulfonic acid salts, salts of phenolsulphonic or naphthalenesulphonic acids, polycondensates of ethylene oxide with fatty alcohols or aromatic acids or with substituted phenols (especially alkylphenols or arylphenols or styrylphenol); salts of sulfosuccinic acid esters; 7% rivals of taurine (especially alkyltaurates); The presence of at least one surfactant additive is generally essential, especially when the inert sulphoxide is not soluble in water.

  water, and that the agent vector of the application is water.

  The compositions used in the invention can

  to be under quite diverse, solid or liquid forests.

  As forms of solid compositions, mention may be made of powders for dusting or dispersion (with a content of

  Active ingredients up to 100%).

  As forms of liquid compositions or intended to constitute liquid compositions during application, mention may be made of the solutions, in particular

  water-soluble concentrates, emulsion concentrates

  Emulsions, concentrated suspensions, aerosols, wettable powders (or spray powder,

pasta.

  The emulsifiable or soluble concentrates most often comprise 10 to 80% active ingredient, the emulsions or solutions ready for application.

  containing, for their part, 0.001 to 20% of active ingredient.

  In addition to the solvent, the emulsifiable concentrates may contain, when necessary, 2 to 20% of suitable additives, such as stabilizers, surfactants, penetration agents,

  corrosion, dyes, adhesives.

  From these concentrates, it is possible to obtain, by dilution with water, emulsions of any desired concentration, which are particularly suitable for application

on the leaves.

  The concentrated suspensions, which are also applicable as sprays, are prepared in such a way as to obtain a stable fluid product which does not settle and usually contain from 10 to 75% of active materials, and from 3.5 to 15% of toning agents. from 0.1 to 10 thixotropic agents, from 0 to 30% of suitable additives, C 0.1, anti-foils, corrosion inhibitors, stabilizers, p-acetylation acetates; In the case of water or liquid, the active substance is little or less soluble. Organic solids or inorganic salts may be dissolved in the support to een dear

  sedimentatiorn or as antifreeze for water.

  The powders naouillablus <or powder to% spray)

  are usually prepared in such a way that

  contain 20 to 95% of active ingredients, and usually contain, in addition to the solid carrier, from 5% of a bleaching agent, from 3 to 10% of an dispersant, and when It is necessary to use one or more stabilizing agents and / or other additives, such as penetrating agents, adhesives, or cosurfactants, coaters, etc, by way of example. here are various wettable powder compositions: active ingredient (6: 5/100> 50% alcohol / ethoxylated fatty alcohol mixture (wetting agent) 2.5% styrylphinol ethoxyl 4 <dispersing agent> chalk <inert carrier) 42 Another example of a wettable powder has the following composition: - active material (B / A mixture at 6.6 / 100> phosethyl-Al 50 I cyinoxanil 3.3% folpel ethoxylated fatty alcohol <wetting agent) 5.7% * - ethoxylated styrylphenol <dispersing agent) 6% To obtain these powders for spraying or for wettable powders, the active ingredient is intimately mixed in melts. Suitable abrasives 6 S with the additional substances and grinded with mills or other suitable grinders. Thereby obtain powders for spraying whose nvibability and suspension are advantageous; they can be suspended with water at any desired concentration and this suspension can be used very advantageously especially for

  the application on the leaves of the plants.

  As already mentioned, aqueous dispersions and emulsions, for example compositions obtained by diluting with water a wettable powder or a multivolvable concentrate according to the invention, are included in the general scope of the present invention. The enzers can be of the water-in-oil or oil-in-water type and they can have a consistency

  thick 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 manufactured by agglomeration or impregnation In general, the granules contain 0.5 to 25% of active ingredient and from 0 to 10% of additives as stabilizers,

  slow release modification, binders and solvents.

  The compounds of formula (II) can also be used in the form of a dusting powder, 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 20 g of active substance, g of finely divided silica and 970 g of talc; we mix and grind these

  components and apply the mixture by dusting.

  The invention also relates to a method for treating plants against phytopathogenic fungi This method is characterized in that it consists in applying to these plants an effective amount of a composition containing as active ingredient a compound according to formula (II) By "effective amount" is meant an amount sufficient to allow the control and destruction of pre-fungi on these 6-veal plants. Doses of use may, however, vary within wide limits depending on the tank, the gear to be combated, the type of cultivation, and climatic conditions SF LV ENDICATIONS 1) Fungicidal composition consisting of a mixture of active irate material, one of which is of the phosphite type, characterized in that it contains at least one of wherein R is DE or an alkyl of 2 to 4 carbon atoms, or an alkoxyl of 2 to 4 carbon atoms M is a hydrogen atom (only lorque-A is it mime one hydroxyl radical) or an atom

  2 G O of alkaline or alkaline earth metal or aluminum.

  n is an integer of 1 to 3 and B) 1 <2-cyano-2-methoxyinincac 4 tyl) -3-ethyl Zee 2) Composition according to claim 1, characterized in that the weight ratio of B / A is between 1 / 100

and 20/100.

  3) Composition according to one of claims 1 and 2,

  characterized in that the B / A ratio is between

2/100 and 10/100.

  4> Corpos-ition according to claim 1, characterized in that

  The corpuscle A is aluminum tris-O-ethylphosphonate.

  54) Conzositien súei'on one of claims 1 to 4

  in that it also comprises a foun-

gicide and antimyroid contact.

  6) Composition according to claim 5, characterized in that

  that the contact fungicide is the folpel.

  7) Composition according to claim 5, characterized in that

  that the contact fungicide is captafol.

  8) Composition according to claim 5, characterized in that

  that the contact fungicide is mancozeb.

  9) Composition according to claim 5, characterized in

  what the contact fungicide is copper-based.

  ) A method of treating plants against fungal diseases, characterized in that they are applied to them

  Composition according to one of Claims 1 to 9.

  11) Treatment method according to claim 10, characterized in that it is applied after the

  contamination of the plants by the fungus (s).