SU298100A1 - - Google Patents

Description

The invention relates to the use of a compound of the general formula as a nematocide.

OII

N-O-C-NH-R

R3-NH-C-O-N C-Ct I

Sr,

where Ri and R2, the same or different, are alkyl having from 1 to 4 carbon atoms, or alkenyl having 4 or 3 carbon atoms;

Rs and R4, which are the same or different, are hydrogen, alkyl with 1 to 4 carbon atoms, alkenyl with 3 or 4 carbon atoms, or propargyl.

These compounds can be obtained by reacting the corresponding mercaptan with dichlorodioxim in an inert solvent, for example alcohol, followed by adding sodium hydroxide to the reaction mixture to form dioctyl mercaptoglyoxime, dissolving the latter in an inert solvent, for example methylene chloride, and adding isocyanate.

plants, by introducing compounds into the soil before or after planting agricultural crops, it is also possible to process the entire field, strips of a certain width of the center

the furrow, a place located directly next to each plant or plant nest, or the area near the planting furrow. These compounds can be used alone or in combination with fertilizers.

The consumption rate of the active substance is 0.25 to 100 kg per 1 hectare of the treated area, preferably from 1 to 50 kg per 1 hectare, or for economic reasons, from 2 to 25 kg / ha.

To combat nematodes in the soil, the proposed nematocide can be successfully applied by applying it to the surface of the soil, from where it will be transferred to the root zone of the plants to be protected by rain or watering water. These compounds are harmless to plants and seeds, and therefore the plants or seeds may be in the soil during processing or they are planted in the soil after it has been processed. The amount of nematocide is the same as

when injected into the soil.

Other uses of the compounds provided by the invention in order to prevent the damaging effects of nematodes parasitizing plants include:

a) spraying aerial parts of plants; stems, leaves or buds in which nematodes are already present, or which may be damaged in the future; b) adding them to the water used during planting; c) immersion or impregnation of the seeds of the bulbs that are already infected or that can be rooted in the soil, into an aqueous suspension, solution or emulsion of the proposed compound; d) immersing the root system or the whole plant obtained from the nursery in a solution (in water or in another solvent) of the compound or in its emulsion in order to disinfect and ensure its protection against subsequent infection with nematodes.

The concentration of the nematicide with such methods applied is in the range from 5 to 5000 g / 100 l of water or other liquid, preferably from 10 to 2500 g / 100, preferably from 25 to 1500 g / 100 l of carrier.

Dry powdered compositions based on the proposed compounds can be used instead of liquid systems by all the methods described above. Such compositions contain from 1 to 60 weight. % nematocide or from 2 to 30 weight. %, preferably from 3 to 15 weight. %

An important feature of the compounds provided by the invention is their ability, under certain conditions, to penetrate the roots of plants from the soil and move along the root system. This means that even parts of the root system located outside the treated SOIL; in some cases, they may be protected from nematode damage.

Example 1. A wettable powder was prepared by offsetting 80 hours, ethyl ethyl N, N-bis (methylcarbamoyloxy) dithioloxalimidate, 2 parts of alkyl sodium naphthalene sulfonic acid sodium salt, Part 1 of partially desulfurized sodium ligninsulfonate and 17 parts of synthetic silicon oxide. This mixture was ground to a particle size of less than 50 microns and moved again. The resulting powder was easily wetted and dispersed in water.

This powder was dispersed in water at a concentration of 5 kg per 100 coal of water. The dispersion was distributed on the soil surface in an amount sufficient to provide from 2 to 25 kg of compound per 1 ha of land. After being distributed on the soil, the powder was displaced from the soil to a depth of 10-15 slg by a tillage machine.

After the soil treatment described above, cotton plants grown in soil infected with southern root nematodes developed normally and were not infected with nematodes. Cotton grown in the same, but not cultivated soil, was stunted, and the crop was poor as a result of infection with nematodes.

Wettable powders with the same satisfactory activity against nematodes can be obtained by replacing diethylN, N-6HC - (methylcarbamoyloxy) - dithioloxalimidate with one of the following compounds.

provided by this invention: dimethyl-M, K-bis - (methylcarbamoyloxy) -dithioloxalimidate, diisopropyl-N, N-bis - (methylcarbamoyloxy) -dithioloxalimidag, dimethyl-M, N-bis- (ethylcarbamioloxy) -dithioloxalimide.

Example 2. A wettable powder was prepared by the method described in Example 1 of the following ingredients (in part):

Diisopropyl-N, N-bismethylcarbamoyloxy) dithioloxalimidate 70

Condensation product of lauryl alcohol with polyethylene oxide3

Oleic isocyanate ester

rub 2

Diatom silica 25

The resulting composition is suitable for dispersion in oil or water prior to introduction into the soil.

The powder was dispersed in water at the rate of 7 kg per 100 l of water. The resulting dispersion was sprinkled (at the rate of 400 l), the experienced cases of the floor, infected with a large number of northern root nematodes, were carefully displaced from the soil to a depth of 10-15 cm using an agricultural machine. Lettuce was planted in this soil, which

grew and gave a harvest of high-quality salad. In the untreated soil, the same lettuce grew poorly, yielded unsatisfactory cabbages as a result of damage to the root system by nematodes.

Wettable powders with the same satisfactory activity can be obtained by replacing diisopropyl-M, M-bis- (methylcarbamoyloxy) -dithioloxalimidate with one of the following compounds: dimethyl-1, K-bis (methylcarbamoyloxy) -dithioloxalimidate, dimethyl-Y, M-bis- (allylcarbamoyloxy) -dithioloxalimidate, dimethyl-M, M-bis- (methylcarbamoyloxy) -dithioloxalimidate and dimethyl-N, N-6HC- (ethnlcarbamoyloxy) -dithioloxalimidate.

EXAMPLE 3 A wettable powder was prepared by the method described in Example 2, but the diiso was replaced (drew PeM-M, M-bis- (methylcarbamoyloxy) -dithioloxalimndate dimethylM, M-bis- (methylcarbamoyloxy) -dithioloxalimidate. This powder was added to the water by calculation 80 ml and used as water in an amount of 235 ml when transplanting each tobacco plant on the field, infected with the northern root nematode and smooth-headed nematodes. The treated plants had a well-developed root system, quickly grew and gave a good leaf. simultaneous combat

root nematodes and soil fungi used a wettable powder from nimer 3 in a spray liquid containing also 1,4-dichloro-2,5-dimethoxybenzene. For this purpose, 2.4 kg of the active substance, halo-2, 5-dimethoxybenzene was added to 100 l of water. This mixture was used for spraying rows of soil 25 cm wide, in which cotton was planted. Practically, 67.5 kg of active substances (22.5 kg of the compound provided by the invention and 45 kg of 1,4-dichloro-2, 5-dimethoxy-benzene) were used per 1 ha of surface. The soil was immediately treated to distribute the chemicals thoroughly. Cotton was planted in the plots. Plant shoots were not harmed by nematodes and fungi. Got a healthy cotton with a good harvest linter. In untreated soil, weak slow-growing cotton was obtained; the yield of linter was low.

Example 5 A wettable powder was prepared as described in Example 2, but using N, N-6HC- (allylcarbamoyloxy) -dithioloxalimidate as a nematocide.

This composition was dispersed in water and applied for spraying at the rate of 40 kg powder in 100 for water pas 1 for soils strongly contaminated with stinging nematodes. After spraying, the powder was deepened into the soil with water used for watering, at a rate of about 20,000 dl per hectare. Grass in cultivated soil grew rapidly and had a deep root system, while grass in untreated soil grew slowly and had a shallow root system as a result of exposure to nematodes.

Example 6 A wettable powder was prepared by the method described in Example 2, but using diethyl H, M-bis- (methylcarbamoyloxy) -dithioloxalimidate as a nematicide. The powder was added to the water at the rate of 2 g1l. Tubers of narcissus infested with stem nematodes were immersed in this solution for 30 minutes. During this period, the suspension is often stirred. Treated tubers planted in the field gave a good harvest of flowers and new tubers. Infected, untreated tubers yielded a poor crop of flowers and new tubers.

Example 7 A wettable powder was prepared as described in Example 2, but dimethyl-S, Ybis- (ethylcarbamoyloxy) dithioloxalimidate was used as a nematocide. This powder was added to water in an amount of 10 g / l. The roots and the bottom of the stems of tree seedlings from the nursery, infected with lancet-like nematodes, were immersed in this suspension, which was mixed.

OO

Iiii

NH-C-O-N C-C N-O-C-NH-R4

The treated seedlings grew well and looked good. Untreated seedlings grew slowly, had a bad appearance and in a number of cases ioghibali.

Example 8. Concentrated dust was prepared by mixing 80 parts of dimethyl-N, Nbis (allylcarbamoyloxy) -dithioloxalimidate with 20 parts of dense fibrous talc. This mixture was ground to essentially pass particles through a sieve with openings of less than 100 mesh. This concentrate can be diluted in the usual manner with talc or other diluents for field use as a dust.

Dust was applied in the field after adding a sufficient amount of fibrous talc based on its 5% active substance content. This dust was used to spray sugar into the furrows.

reed at the rate of 0.5 kg of the active substance per 1000 m of the furrow, the stream being directed to cover the lateral surface and the bottom of the furrow, then the furrow was closed. 10 weeks after planting, a stable, well-developed sugar cane grew in the furrows. The reed in the untreated grooves was short as a result of the emergence of roots by lancet-like nematodes, spiral nematodes, and nematodes that slow down

growth.

Example 9. A dry mixture containing 50% dimethyl-y, 1M-bis- (methylcarbamoyloxy) -dithioloxalimidate and 95% gypsum and ammonium sulfate was prepared. These components were mixed in a concrete mixer, spraying water until the mixture was lumpy. The mixture was dried and sieved through a sieve to separate the granules from 0.25 to 0.84 liters. The granules are easily destroyed in the water, while quickly emitted

active substance.

The granules were used for spreading on the plots of the field with a conventional fertilizer spreading machine at the rate of 40 kg of active substance per 1 ha, then the soil was treated

disc harrow. After such a treatment, the floor of tobacco, grown in soil contaminated with smooth-headed nematodes and southern root nematodes, developed normally; on untreated areas, the floor grew

slowly and gave few leaves suitable for sale.

The subject of the invention. Use of a compound of the general formula

1 I Ri-S S-R 7 R-3 and H4, either unitic or different, are hydrogen, alkyl with 1 to 4 carbon atoms, alkenyl with 3 or 4 carbon atoms, or propargyl, as a nematicide.