JPH0635362B2 - Stable paste pesticide application - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention blends an agrochemical active ingredient, monoglycols or polyglycols that are liquid at room temperature, and polyglycols that are solid at room temperature. The present invention relates to a stable pasty pesticide coating agent characterized by the following.

[Conventional technology]

Pesticide formulations are classified into powders, emulsions, wettable powders, granules and the like depending on the form. Generally, powders, emulsions, wettable powders, and other spraying agents quickly reach crops and pests to be controlled, pathogens, weeds, etc., and have a rapid-acting effect, but on the other hand, they are uniformly sprayed on the field. Therefore, most of the chemicals are wasted without reaching the crops or the control target. In addition, pesticides that are highly toxic to humans and livestock cannot be used as sprays and are used as granules.Generally, pesticides treated on the soil surface as granules are effective after being absorbed by crops and weeds. Therefore, it is slow-acting, and the amount of the drug that is not absorbed and wasted is larger than that of the spray agent. This leads to the problem of soil retention, and it is therefore desirable to minimize the amount of chemicals wasted without reaching the crops or control targets from the viewpoints of effect, soil retention and cost. .

In contrast to these pesticide formulations, pesticide coating agents that directly treat the trunks of plants have a very small amount of waste chemicals that do not reach the crops or the control target, are highly effective, and can also avoid soil residue problems. It is a pesticide formulation.

[Problems to be solved by the invention]

Conventional pesticide coating agents are usually acrylic resin, chlorinated rubber, petroleum resin, polyvinyl acetate, polyvinyl alcohol, latex emulsion, α-starch, vinyl polymer, cellulose ethers, carboxymethyl cellulose, tragacanth gum, gum arabic, etc. The film-forming agent is mixed and dispersed in water or an organic solvent together with the filler. However, when an organic solvent is used for the preparation of the coating agent, it often causes phytotoxicity to crops, and when water is used, it causes a problem in the stability of the components, and in particular, the organic solvent The stability of the phosphorus compound is extremely deteriorated.

The present invention has been made as a result of intensive studies to solve this problem.

[Means for solving problems]

The pasty pesticide coating composition of the present invention comprises a pesticide active ingredient, monoglycols or polyglycols that are liquid at room temperature, and polyglycols that are solid at room temperature, and if necessary, other An organic solvent, a surfactant, a fine powder filler or a higher alcohol, a filler such as paraffin, lanolin, petrolatum, and beeswax, and the like are blended.

The coating agent in the present invention means an agrochemical formulation for the purpose of exerting effects such as insecticidal, bactericidal, weeding, and repellent by applying the drug to the trunks of plants such as crops, trees and weeds.

The coating agent of the present invention shows no phytotoxicity to crops and has no problem with stability of the active ingredient.

The active ingredient of the pesticide that can be used in the present invention may be one that is solid or liquid at room temperature, and includes insecticides, fungicides, herbicides, plant growth regulators and repellents. Examples of the compound include the following, but the present invention is not limited thereto.

Dimethyl (E) -1-methyl-2- (methylcarbamoyl) -vinyl phosphate, (generic name: monocrotophos) 2,3-dihydro-2,2-dimethylbenzofuran-7
-Ylmethylcarbamate, (generic name: carbofuran) (±) -methyl N- (2-methoxyacetyl) -N-
(2,6-xylyl) -DL-alaninate, (generic name: metalaxyl) 1- [2- (2,4-dichlorophenyl) -n-pentyl] -1H-1,2,4-triazole, (general Name: Penconazole) DL-2-amino-4- [hydroxy (methyl) phosphoryl] butyric acid, (general name: glyphosinate) As the monoglycols used in the present invention which are liquid at room temperature, liquid or viscous monoglycols are used. Any glycol can be used, and examples thereof include ethylene glycol, propylene glycol, hexylene glycol, and glycerol. The liquid polyglycols at room temperature may be liquid or viscous polyglycols,
For example, polyethylene glycol having a low degree of polymerization, such as polyethylene glycol # 200 (degree of polymerization 200: as an average molecular weight), liquid polyethylene glycols such as # 300, # 400, and # 600, polypropylene glycols and the like can be mentioned. These alone or 2
It is also possible to use a mixture of two or more species.

Examples of the polyglycols which are solid at room temperature used in the present invention include polyethylene glycol having a high degree of polymerization, for example, polyethylene glycol # 1000 (degree of polymerization 1000:
(As average molecular weight), # 1540, # 2000, # 40
Solid polyethylene glycols such as 00, # 6000 and # 2000 can be mentioned.

The organic solvent that can be used in the present invention, as long as it has an affinity for the active ingredients of the paste base and agricultural chemicals, does not harm the crops, and does not deteriorate the stability of the active ingredient, for example, cellosolves, Carbitols, dimethylsulfoxide, dimethylformamide, organic acid esters, ketones and the like can be used.

As the surfactant, nonionic or anionic surfactants commonly used for agricultural chemicals can be used.

As the fine powdery filler, fine powders such as clay, bentonite, kaolinite, talc, calcium carbonate, gypsum, diatomaceous earth, and synthetic hydrous silicic acid which are commonly used in pesticide powders and granules can be used.

The respective proportions of the pesticide active ingredient in the present invention, the monoglycols or polyglycols which are liquid at room temperature and the polyglycols which are solid at room temperature are appropriately changed depending on the physical properties of the active ingredient and the amount of other additives. However, the ratio of pesticide active ingredient is 0.01% to 90% when expressed in% by weight based on the formulation.
From the range of 5% to 95% of the liquid-state monoglycols or polyglycols at room temperature, and from 5% to 80% of the solid polyglycols at room temperature.
% May be appropriately selected from the range, and if necessary, an organic solvent, a surfactant, a fine powder filler or a higher alcohol, a filler such as paraffin, petrolatum, lanolin and salix beeswax may be appropriately added. It may be mixed in the ratio of.

As a method for producing the pasty pesticide coating composition of the present invention, for example, liquid monoglycols or polyglycols at room temperature and polyglycols solid at room temperature, further surfactants or higher alcohols as necessary, After adding and mixing extenders such as paraffin, petrolatum, lanolin, and beeswax, and heating and melting at 40 to 100 ° C, stop heating and add active ingredients of pesticide and organic solvent, fine powder filler, etc. as necessary. A method of preparing a viscous pasty agricultural chemical coating agent by adding and mixing and gradually cooling it can be mentioned.

[Examples and effects]

Examples and test examples of the present invention will be given below, but the present invention is not limited thereto.

Example 1 14 parts of hexylene glycol was added to 12.5 parts of monocrotophos and stirred to dissolve completely. Separately, 40 parts of polyethylene glycol # 400 and polyethylene glycol # 40
33.5 parts of 00 were heated to 60 to 80 ° C. while being mixed and stirred to be melted. Stop heating when completely melted,
The above monocrotophos-hexylene glycol solution was added to this, and the mixture was gradually cooled while stirring and kneading, and the active ingredient was added.
A 12.5% pasty coating agent was obtained.

Example 2 To 12.5 parts of carbofuran was added 2.5 parts of synthetic hydrous silicic acid,
A sample mill (manufactured by Horikawa Micron Co., Ltd.) was pulverized to obtain carbofuran powder. Separately, 21 parts of polyethylene glycol # 400, polyethylene glycol # 400
While mixing and stirring 036 parts and 8 parts of hexylene glycol, the mixture was heated to 60 to 80 ° C. and melted. 20 parts of dimethyl sulfoxide was added to this and sufficiently stirred and mixed, and then 15 parts of the above carbofuran powder was added and gradually cooled while stirring and kneading to obtain a paste-like coating agent containing 12.5% of the active ingredient.

Example 3 50 parts of synthetic hydrous silicic acid was added to 50 parts of metalaxyl and pulverized with a sample mill (manufactured by Horikawa Micron Co., Ltd.) to obtain 50% metalaxyl powder. Separately, 35 parts of polyethylene glycol # 400 and polyethylene glycol #
While mixing and stirring 4000 parts, 4000 parts were heated to 60 to 80 ° C. to be melted. To this, 20 parts of dimethyl sulfoxide and 10 parts of the above metalaxyl 50% powder were added and stirred.
While kneading, the mixture was gradually cooled to obtain a pasty coating agent containing 5% of the active ingredient.

Example 4 5 parts of penconazole were dissolved in 20 parts of dimethyl sulfoxide. Separately polyethylene glycol # 400 24
Part, polyethylene glycol # 4000 43 parts, hexylene glycol 8 parts by heating and melting at 60 to 80 ° C.,
The above-mentioned dimethyl sulfoxide solution of benconazole was added thereto, and gradually cooled while stirring and kneading to obtain a pasty coating agent containing 5% of the active ingredient.

Comparative Example 1 4 parts of polyvinyl alcohol was dissolved in 65.5 parts of water, and 12.5 parts of monocrotophos was further added and stirred to dissolve. To this, 18 parts of synthetic hydrous silicic acid was added and kneaded to prepare the active ingredient 1
A 2.5% paste-like coating agent was obtained.

Comparative Example 2 2.5 parts of synthetic hydrous silicic acid was added to 12.5 parts of carbofuran and pulverized with a sample mill (manufactured by Hosokawa Micron Co., Ltd.) to obtain carbofuran powder. Separately, 4.4 parts of polyvinyl alcohol was dissolved in 66.1 parts of water, and 15 parts of the above-mentioned carbofuran powder was added thereto, and the synthetic hydrous silicic acid was stirred.
14.5 parts was added and kneaded to obtain a paste-like coating agent containing 12.5% of the active ingredient.

Comparative Example 3 42.5 parts of phenyl cellosolve was added to 10 parts of polyvinyl acetate and dissolved by stirring. 12.5 parts of monocrotophos,
35 parts of clay was added and kneaded to obtain a pasty coating agent containing 12.5% of the active ingredient.

Comparative Example 4 50 parts of synthetic hydrous silicic acid was added to 50 parts of metalaxyl and pulverized with a sample mill (manufactured by Hosokawa Micron Co., Ltd.) to obtain 50% metalaxyl powder. This metalaxyl 50
% 10 parts of powder, 10 parts of ethyl cellulose and 9 parts of synthetic hydrous silicic acid were added and mixed, and further 71 parts of diethylene glycol monoethyl ether acetate was added and kneaded to obtain a paste-like coating agent containing 5% of the active ingredient.

Test Example 1 Stability Test The paste-like coating agents of Examples 1, 2, 3 and 4 of the present invention and the paste-like coating agents of Comparative Examples 1, 2, 3 and 4 were placed in glass closed containers at 40 ° C., respectively. It was placed in an incubator for 15 days and 30 days. After that, the respective component concentrations were measured and compared with the component concentrations immediately after the adjustment to obtain the component residual rate. The results are shown in Table 1.

Test Example 2 Effect and phytotoxicity test The paste-like coating agents of Examples 1, 2, 3 and 4 of the present invention and the paste-like coating agents of Comparative Examples 1, 2, 3 and 4 were used at the fifth leaf stage eggplant (variety: 1,000 units). ) Stem part 100mg per plant
(Component amount 12.5 mg) was applied. 7 days after drug treatment and 21
One day after the inoculation, the third-instar larva of Aphis gossypii was inoculated, and one day after the inoculation, its survival was confirmed and the mortality rate was calculated. After 21 days from drug treatment, the degree of drug damage was observed and judged according to the following criteria.

+: No phytotoxicity ±: A small part of the leaf edge is browned or yellowed +: A part of the leaf edge is browned or yellowed; About half of the leaf edge is browned or yellowed; About half of the leaf edge Is brown spot or yellow spot; withered. The results are shown in Table 2.

Test Example 3 Control effect test against cucumber bean disease and tomato disease The paste-form coating composition of Example 3 of the present invention and the paste-form coating composition of Comparative Example 4 as a control were used as the fifth leaf stage of Cucumber (variety: Hokushin) and A predetermined amount was applied to the stem base of a 5-leaf stage tomato (variety: Fukuju No. 2). Seven days after the treatment with the drug, the yellow cucumber and the disease fungus (Pseudoperonospora cubensis)
Each tomato was inoculated with the tomato disease fungus (Phytophthora infestans). Seven days after the inoculation, the degree of disease was investigated and the control value was calculated. At the same time, the degree of phytotoxicity on the cucumber was observed and judged based on the same criteria as in Test Example 2. The results are shown in Table 3.

Claims (1)

[Claims] 1. A stable pasty pesticide characterized by comprising an active ingredient of pesticide, a monoglycol or a polyglycol which is liquid at room temperature, and a polyglycol which is solid at room temperature. Coating agent.