SI9400260A - Fungicidal seeds treatmnet using phosphorous acid or its salt - Google Patents

Description

RHONE-POULENC AGROCHIMIE

Seed treatment with phosphoric acid or one of its salts and the seeds thus treated

The present invention relates to plant seeds protected against fungal disease, as well as to antifungal preparations useful for obtaining such protected seeds, and to a seed treatment process in order to obtain protected seeds.

Even more advantageously, the present invention relates to seeds of monocotyledonous plants protected against fungal disease, as well as to antifungal preparations useful for obtaining such protected seeds, and to a process for the treatment of seeds in order to obtain protected seeds.

It was known that it was possible to combat plant fungal diseases by foliar application of phosphoric acid and its derivatives (British patent 1459539), but this use did not penetrate in practice due to the phytotoxicity of the compounds containing these ingredients (European patent application 230209) .

We have now surprisingly found that preparations having a good protective effect against seeds and plants derived from the germination of these seeds can be obtained in order to protect the seeds with phosphoric acid or its derivatives without disturbing this protection by inappropriate phytotoxicity.

According to the present invention, the term seed denotes all the breeding parts (propagating material) of a plant that can be used for its propagation. This includes seed grains (seed in the narrow sense), roots, roots, fruits, tubers, bulbs, plant parts, sprouted plants, young plants originating from seed grains, cuttings, cell cultures and artificial seeds, such as. those described in patent applications FR 9305192 or PCT / FR 91/00984 (published under WO 92/10087).

The present invention relates in more detail to natural or artificial seeds, preferably seeds of monocotyledonous plants, characterized in that they contain on the grains or inside them an effective amount of the active ingredient selected from the group consisting of phosphoric acid or its salts, in the absence of triazole, 2- (4-Chlorobenzylidene) -5,5-dimethyl 1 - [- 1 H, 2,4-triazol-1-ylmethyl] -1-cyclopentanol.

Phosphoric acid, also called phosphonic acid, is a product of the formula HP (O) (OH) ₂ (abbreviated as H ₃ PO ₃ ). Its salts are called phosphites and can be mono- or di-salts, preferably alkali salts or ammonium salts, especially Na ₂ HPO ₃ , I ^ HPO ^ nh ₄ h ₂ by ₃ .

In practice, the effective amount of the retained phosphorus type active ingredient is generally between 1 g / q and 1 kg / q (q stands for quintal = 100 kg), preferably between 5 and 500 g / q.

Preferably, the seed beads are coated with 1 to 500 g of the active ingredient per quintal of grains and preferably 5 to 300 g / quintal.

The phosphorous type active substance is preferably selected such that its water solubility at 20 ° C is greater than 0.1 g / l, more preferably more than 0.5 g / l and more preferably more than 50 g / l. Substances with less solubility may also be used, but fairly reworked preparations, e.g. wettable powders or aqueous suspensions. The use of active ingredients with sufficient solubility, as we have just defined, is advantageous because it allows the seeds to be treated with simple solutions, which is most economical.

According to the first variant, the invention also relates to plants originating from the seed germination that we have just defined, these plants being in the stage of one or two leaves.

Obtaining such plants is all the more important because it would be expected that residual phosphoric acid for germinating plants would have a phytotoxic effect just as it had a phytotoxic effect on foliar treatment.

The invention is particularly advantageous for the protection of seeds corresponding to crops belonging to the group consisting of cereals, in particular cereals, wheat, barley, rye, early barley, oats, triticale; maize, rice, against fungal diseases.

The invention is particularly advantageous for the protection of seeds against * diseases belonging to the group comprising Pythium arrhenomanes, Pythium graminicola, Pythium torulosum, Pythium vanterpoolii, Pythium myriotylum, Pythium periilum, Pythium aristosporum, Pythium aphanidermatum * fungus, young root necrosis, * necrosis of the base of the stems of young plants.

The invention also relates to antifungal preparations intended for the protection of seeds, preferably seeds of monocotyledonous plants, against fungal diseases, characterized in that they contain:

* at least one active ingredient selected from the group consisting of phosphoric acid or its salts, * at least one inert, agriculturally acceptable carrier, and * optionally an agriculturally acceptable surfactant, * wherein the various constituents of these preparations are not triazole. (4-Chlorobenzylidene) -5,5-dimethyl-1- [1H, 2,4-triazol-1-ylmethyl] -1-cyclopentanol.

The compositions of the invention typically contain between 0.5 and 95% by weight of phosphorus-type active substance. Preferably, the amount of phosphorous-type active ingredient in these preparations is more than 5% by weight.

The present invention also relates to a method for the protection of seeds, preferably seeds of monocotyledonous plants, against fungal diseases, characterized in that an effective amount of an antifungal agent and / or antifungal preparation, as defined above, is applied to these seeds. According to the process of the invention, the application of the fungicidal active substance of the phosphorous type is carried out by means of preparations containing at least 5%, preferably at least 10% of the active ingredient of the phosphorous type.

In the present review, the term carrier is referred to as an organic or mineral, natural or synthetic substance with which the active substance is combined in order to facilitate its application to the seed. This carrier is therefore generally inert and must be acceptable in agriculture, in particular on the treated seed. The carrier may be solid (clays, natural or synthetic silicates, silica, resins, waxes, solid fertilizers, etc.) or, preferably, liquid (water, alcohols, ketones, petroleum fractions, aromatic or paraffinic hydrocarbons, chlorinated hydrocarbons, etc.). As previously stated, liquid carriers, in particular those in which the phosphorous substance is soluble, are particularly preferred, especially water and aqueous solutions.

The surfactant may be an emulsifying, dispersing or wetting agent of ionic or non-ionic type. As an example, salts of polyacrylic acids, salts of lignosulfonic acids, salts of phenolsulfonic or naphthalenesulfonic acids, polycondensates of ethylene oxide with fatty alcohols or with fatty acids or with fatty amines, substituted phenols (especially alkylphenols or arylphenolates), in particular alkyl esters), phosphoric acid esters of alcohols or polyoxyethylated phenols. The presence of at least one surfactant is often required.

These preparations may also contain a variety of other ingredients, such as e.g. protective colloids, adhesives, thickeners, thixotropic agents, penetrating agents, stabilizers, sequestering agents, pigments, colorants, polymers.

More generally, the compositions of the invention may be combined with any solid or liquid additives that conform to conventional formulation techniques, in particular for seed treatment applications.

In this connection, we note that in the vocabulary of experts, the term 'Seed treatment actually refers in particular to the treatment of seed grain.

The techniques of the application are known to the person skilled in the art and can be used without prejudice in the context of the present invention.

Examples include film coating or coating. Coating is advantageous in the invention because of its simplicity: it is sufficient to mix or mix the seed to be treated with the antifungal compositions of the invention.

Solid or liquid preparations may generally be referred to as preparations.

Solution forms, in particular water-soluble concentrates, emulsifiable concentrates, emulsions, concentrated suspensions, wettable powders (or spray powder), may be mentioned as forms of liquid preparations or forms intended to form liquid preparations when in use.

Emulsifiable or soluble concentrates most commonly comprise 10 to 80% of the active ingredient, while emulsions or ready-to-use solutions contain 0.01 to 20% of the active substance.

Emulsifiable concentrates may, if necessary, contain e.g. in addition to solvent 2 to 20% of suitable additives, such as stabilizers, surfactants, penetration agents, corrosion inhibitors, colorants or adhesives, as previously stated.

These concentrates can be obtained by diluting with water emulsions at any desired concentration, which are particularly suitable for application on seeds.

Moisturizing powders (or spray powder) are usually prepared to contain 20 to 95% of the active ingredient, and typically contain from 0 to 5% of a wetting agent, from 3 to 10% of a dispersant and, if necessary, from 0 to 10 % of one or more stabilizers and / or other additives, such as pigments, colorants, penetrating agents, adhesives or anti - caking agents, etc.

As previously stated, aqueous dispersions and emulsions, e.g. preparations obtained by diluting a wettable powder or emulsifiable concentrate of the invention included in the general scope of the present invention. Emulsions can be water-in-oil or oil-in-water and may have a dense consistency such as mayonnaise consistency.

Among these preparations, one skilled in the art will choose one or more suitable according to the conditions of use.

In the invention, the phosphoric acid derivative may be used alone or in admixture, especially with fungicides or insecticides, in particular captan, tyram, aspirin or its salts and esters, salicylic acid or its salts and esters, guazatin, copper oxyquinoleate, teflutrin, anthraquinone, metal also insecticides such as imidacocloprid, lindane and endosulfan, as well as mixtures of these various products.

The following examples, which are given by way of non-limitation, illustrate the invention and show how it can be used.

EXAMPLE 1

100 g of barley slurry was treated with 1.5 ml of aqueous phosphoric acid solution. The respective concentration of the treatment solution was calculated by obtaining the seed dose (in g / q) of the products listed in the following table. In the case of a dose of 100 g / q, the concentration of phosphoric acid in water was 75 g / l.

The treatment was carried out by simple stirring and stirring for 1 min to obtain seeds containing different concentrations of phosphoric acid, as shown in the following table.

This grain was placed in pots containing a mixture of peat and pozzolan. One milliliter of ground Pythium mycelia was inoculated into each crucible by spraying the soil. There were about 20 grains of seed in each pot.

The grains germinated and 15 days after sowing, the condition of the plants was examined for control grains that were not treated with phosphoric acid and for control grains that had not been inoculated with Phythium. All the sprouting plants had 2 leaves. No phytotoxicity was observed in any case.

The results are as follows:

Antifungal agent Dose in g / q Efficiency expressed as a percentage Pythium arrhenomanes Pythium myriotylum Phosphoric acid 50 60 40 100 100 60 Sodium monophosphite 100 75 20 200 100 70 400 100 100 800 100 100 Raw control 0 0 0

EXAMPLE 2

The barley grains were treated as in Example 1 with an aqueous solution of potassium diphosphite. In order to obtain a dose of 240 g / q of seed products, 100 g of seeds were treated with 1.5 ml of a solution containing 180 g / 1 K ^ HPOj.

Seeds were treated by harvesting 240 g / q of phosphite on these seeds.

The seeds so treated were sown in the open air and 72 days after sowing the condition of the crop was compared with the untreated control. In all of these cultures, fungal infection with Pythium arrhenomanes occurred.

It was observed that, compared to untreated plants, the plants that originated from the treatment according to the invention contained 2.8 times more roots and that the number of plants themselves was 24.3% higher. The dry weight of the roots of treated plants was 39% higher than that of untreated plants.

For

RHONE-POULENC AGROCHIMIE:

ΡΑΤΖΜΐϋί

L.J 'J3?> 3Ακ? ΊΑ

Claims (14)

PATENT APPLICATIONS Plant seeds, characterized in that they contain on the grains or on the inside thereof a fungicidally effective amount of the active ingredient selected from the group formed by phosphoric acid or its salts in the absence of triazole-2- (4-chlorobenzylidene) -5,5 -dimethyl-1- [1H1, 2,4triazol-1-ylmethyl] -1-cyclopentanol. 2. Seeds of monocotyledonous plants, characterized in that they contain on the grains or on the inside thereof a fungicidally effective amount of the active ingredient selected from the group consisting of phosphoric acid or its salts, in the absence of triazole 2- (4-chlorobenzylidene) -5,5- dimethyl-1- [1H1, 2,4-triazol-1-ylmethyl] -1-cyclopentanol. Seeds according to claim 1 or 2, characterized in that the phosphorous substance comprises phosphoric acid or one of its alkali or ammonium salts. Seeds according to claim 1 or 2, characterized in that the phosphorous active ingredient is selected such that its water solubility at 20 ° C is greater than 0.1 g / l, preferably more than 0.5 g / l. Seeds according to one of Claims 1 to 4, characterized in that the phosphorous substance is present in an amount between 1 g / q and 1 kg / q, preferably between 5 and 500 g / q. Seeds according to any one of claims 2 to 5, characterized in that the monocotyledonous plant is selected from the group consisting of cereals, in particular cereals, wheat, barley, rye, early barley, oats, triticale; corn, rice. Seeds according to one of Claims 1 to 6, characterized in that they are protected from the onset of disease from a group consisting of * diseases belonging to a group comprising Pythium arrhenomanes, Pythium graminicola, Pythium torulosum, Pythium vanterpoolii, Pythium myriotylum, Pythium periilum, Pythium aristosporum, Pythium aphanidermatum * fungal rot of the base of the stems of young plants, * root necrosis, * necrosis of the base of the stems of young plants. Seeds according to one of Claims 1 to 7, characterized in that they contain another active ingredient selected from the group consisting of captan, thiram, guazatin, copper oxyquinoleate, metalaxyl, as well as insecticides such as imidacloprid, lindane and endosulfan. Seeds according to one of Claims 1 to 7, characterized in that they contain another active ingredient selected from the group consisting of aspirin or its salts and esters, salicylic acid or its salts and esters. 10. Young plants originating in seed germination according to any one of claims 1 to 9. A method for protecting against fungal diseases of seeds, preferably seeds of monocotyledonous plants, characterized in that an effective amount of a phosphorous active ingredient from the group consisting of phosphoric acid and its salts is applied to these seeds. 12. Antifungal preparations for the protection of seeds, preferably seeds of monocotyledonous plants, against fungal diseases, characterized in that they contain: * at least one active ingredient selected from the group consisting of phosphoric acid or its salts, * at least one inert, agriculturally acceptable carrier, and * optionally an agriculturally acceptable surfactant, * wherein the various constituents of these preparations are not triazole -2- (4-chlorobenzylidene) 5,5-dimethyl-1- [1H, 2,4-triazol-1-ylmethyl) -1-cyclopentanol. Compositions as claimed in claim 12, characterized in that they contain between 0.5 and 95% of a phosphorous type active ingredient. Preparations according to one of Claims 12 or 13, characterized in that they are liquid and preferably aqueous.