SU471696A3 - Fungicidal composition - Google Patents

Description

(54) FUNGICIDE COMPOSITION

I

The invention relates to chemical agents for controlling plant pathogens.

The fungicidal and bactericidal action of halogen-substituted derivatives of 8-hydroxyquinoline, thiabendazole, and also quaternary ammonium halide salts is known.

However, the known fungicides are not sufficiently active against the genus of parasitic and saprophytic fungi.

In order to enhance the fungicidal activity, a composition is proposed containing three components: 8-hydroxyquinoline derivatives of the general formula:

X

where X and Y may be the same or different and represent a hydrogen atom or chlorine; Hexadecyl trimethylammonium is used as the second component, and thiabendazole is the third component.

The form of preparation of the drug is usual: in the form of a solution of dust, emulsion concentrate.

The activity of contact-active fungicides and low phytotoxicity of the proposed composition can be seen from the results of examples obtained in the laboratory, in laboratory conditions and in field experiments.

In addition, it was found that these formulations enhance the growth of germ of cereals in the first days of germination by 20-30% based on the weight of the fresh mass.

Example 1. The seeds of barley infected under drive conditions with the fungus Ustilago nuda and. Helminthosporium gramineum are treated with a composition containing 10% of a mixture of 5-chloro-5,7-dichloro-8oxyquinoline and hexadecyltrimethylammonium bromide in a ratio of 12.5: 1, 20% thiabendazole and 70% starch (composition No. 1). The composition for comparison contains 20% of a mixture of 5-chloro- and 5,7-dichloro-8-hydroxyquinoline bromide and hexadecyltrimethylammonium bromide in a ratio of 12.5: I and 80% of starch (composition No. 2).

At the onset of flowering, the number of ears infected with U / nuda is counted in five control units. Infection of plants of N. gramineum is estimated on a five-point scale: 5 - more than 75% of plants are infected; 4 - 50-75% of plants; 3 - 25-50% of plants, 2 - 10-25% of plants, 1 - less than 10% of plants, O - no infection.

3

The results are shown in Table. one.

Table I

di.my symptoms of infection (coleoptile), and healthy plants.

Valid in table. 3 results show the synergistic effect of the studied

composition (it is non-phytotoxic).

Table 3

Example 2. Healthy wheat seeds infect with spores of the fungus Tilletia tritici. Infected seeds are treated with composition No. 1 and No. 2 and for comparison with composition No. 3-8, respectively, containing 15, 18, or 20% methyl bromide 5-chloro and 5,7-dichloro-8-hydroxy IIoline + hexadecyl trimethylammonium (12.5: 1) and 80, 82, 85 or 90% of starch and the composition for comparison, containing 30 or 60% thiabendazole and 70 or 40% starch, and 100 kg seeds.

Infected and treated with a powder. C. Change is sown in medium yellow silty field land in Letri thicket so that the seeds are pressed into the ground by the hairy side. Petri boxes are placed for three days in a refrigerator at 5 ° C, then for five days at 18 ° C. After 8 days, spore germination is estimated for each seed in the place where it adjoined to the ground. The evaluation is carried out using a Micro-Microcon stereo with a 60x magnification.

The results are shown in Table. 2

table 2

Example 3. Wheat seeds infected in natural conditions with the fungus Septoria nodorum are treated with the compositions as in Example 2, and, in addition, with a composition containing 18% of composition No. 2, 20% of tiabendazole and 62% of starch.

Infected and powder-treated seeds are sown in a field that is not too heavy with 60-70% field capacity. Relative humidity in the chamber is 70-75%; temperature 15-18 ° C. 10 days after sowing, plants are evaluated with vi97, 00

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 Treatment with a composition of 34-20% 1 iabendazole.

(Example 4. Corn seeds infected under natural conditions with Fusarium graniinearum fungus are treated as in Example 3. Before being treated, seeds are immersed for 10 minutes in 0.5% sodium hypochlorite solution so that saprophytic microflora on the surface does not prevent the development of the fungus. .

Each experiment was carried out in 40 Petri dishes with 5 seeds each based on 2% potato dextrin agar. Stand in a thermostat for 7 days at 22 ° C. Estimate the percentage of seeds with developed fungus. The results are shown in Table. four.

Table 4

| P "M me r 5. Completely healthy bean seeds are treated as in example 4, and sown in flint stone with grains with a diameter of up to 1.2 mm. Every 3000 leguminous plants at the age of 7 days from each treatment are sprayed with a suspension containing 4 -.10 spores of the fungus Colletotricum lindemutianum.

Infected plants are covered with a plastic canopy, under which the relative humidity is 100%. The fungus is kept in a thermostat for 7 days at 18 ° C. The percentage of the plant with visible dark spots is estimated. The results are shown in Table. five.

Table 5 P, example 6. Bean seeds infected under natural conditions with the fungus C. lingemulianum are treated as in example 4. In addition, they are treated with compositions No. 10, 11 and 12, containing respectively 15, 25 and 50% tiabendazole , 10% of each of the mixtures of methyl 5-chloro- and 5,7-dichlo; p-8-hydroxyquinoline + hexadecyl trimethyl ammonium (12.5: 1) and respectively 75, 65 or 40% starch. After 14 days, the sowing of the plants with the symptoms of infection was evaluated by the sowing group. In tab. 6 shows the results of the experiment. Table 6 Example 7. Seeds of wheat, of which 86% are naturally infected with 1 Alternaria tenuis fungus, are treated with 40 g of powder of composition No. 8 and the same amounts of the same composition, to which 5-20 g of composition No. 3 are added ( in all cases per 100 kg of seed). Wheat seeds of the same variety are also pollinated with a preparation containing 40 g of formulation No. 3, 120 g of formulation No. 8, 40 g of formulation No. 3-M20 g, formulation No. 8, as well as 5-20 g of formulation No. 9 (per 100 kg of seed n) Infected seeds treated with powder are placed in Petri dishes on a base with 2% malt agar and kept in a thermostat for 7 days at 20 ° C. Number

seeds with a developed fungus, depending on the number of seeds with a developed fungus, for non-treated control seeds are determined and calculated as the effect of the composition. The results are shown in Table. 7

Table 7 Example 8. Barley seeds, 54% of which are infected under natural conditions with fungus and. nuda, is treated with 25 g of powder composition No. 3 and the same amount of the same component, to which 20-60 g of composition No. 8 are added (in all cases per 100 kg of seed). Barley seeds of the same variety are treated with a preparation containing 50 g of formulation No. 3, 150 g of formulation No. 8, 50 g of formulation No. 3 + 150 g of formulation No. 8, as well as 20- 60 g of formulation No. 8 (per 100 kg seed). Seeds are sown in pots containing not very desirable field soil. Plants are grown in an open greenhouse under normal environmental conditions. In the growth stage of the second and third leaves, the KOLOSOV inter-sites are treated as follows: first, they are decolorized by boiling in a 5% solution of sodium carbonate, washed in water, immersed in a solution of 0.1 g of aniline blue, 50 ml of lactic acid and 100 ml of distilled water and re-washed in water. The number of seeds with fungus-stained micell is determined relative to the number of seeds with fungal mycelium in the untreated Control seeds and is calculated as the effect of the composition. The results are shown in Table. 8. Table 8 7 RED MET OF THE INVENTION The fungicidal composition based on 8-hydroxyquinoline derivatives of the general formula: 8 where X and Y can be the same or different and represent a hydrogen or chlorine atom, characterized in that, in order to enhance the fungicidal activity Hexadecyltrimethylammonium and thiabendazole are introduced into it.