JPS61291502A - Method for controlling noxious life - Google Patents

Abstract

PURPOSE:To control pathogenic fungus and vermin in agricultural field and the mold, wood-estroying fungus, vermin, etc., under the floor of building, etc., by spraying a liquid mixture of a noxious life-controlling component and a water-based resin emulsion to the surface of soil to form a layer for the control of noxious life. CONSTITUTION:A layer for controlling noxious life is applied to the surface of soil by spraying a liquid mixture of (A) a noxious life-controlling component (e.g. organophosphorus insecticide, pyrethroidal insecticide, carbamate-type insecticide, insect repellent, etc.) and (B) a water-based resin emulsion having a minimum film-forming temperature of <=30 deg.C at the time of spraying. Pathogenic fungus and vermin in agricultural field and the mold, vermin (e.g. termite), etc., under the floor of building, etc., can be controlled by this procedure. Since the resin component maintains the noxious life-controlling component and the soil, the loss of the active component impregnated into the soil or washed off with rain can be prevented and the controlling composition can be handled easily. The resin is e.g. styrene-acrylic resin, etc., and its amount is 15-60wt% as the solid component in the emulsion.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for controlling pests by forming a pest control layer on the soil surface, and more specifically, to a method for controlling agricultural pests, and This relates to methods for controlling harmful organisms such as mold, indestructible bacteria, and pests that live under the floors of buildings.

[Conventional technology]

Conventionally, in order to control agricultural pests, etc., emulsions,
It is known to spray hydrating agents.

[Problem that the invention seeks to solve]

However, the conventional methods of spraying emulsions and hydrating powders on farm soil or under the floors of buildings, etc., have disadvantages such as easy penetration into the soil and washing away in rainwater. Also,
If the treated chemicals remain for a long time, it may be difficult to remove them, or depending on the ecology of the pest, it may be necessary to use a large amount of energy, such as mixing emulsions or wettable powders into the soil or digging and injecting them, rather than simply spraying them. It took a lot of effort. In addition, chemicals that easily volatilize lose their effectiveness in a short period of time, and those that easily decompose when they come into contact with soil often cannot be used.

Means for Solving Problem C] As a result of intensive research to improve the above-mentioned drawbacks of emulsions and wettable powders, the present inventor sprayed a liquid mixture consisting of an aqueous resin emulsion and a pest control component on the soil surface. In this case, the inventors have found that the above-mentioned drawbacks can be improved because the resin component of the emulsion retains the pest control component and the soil to form a pest control layer on the soil surface, and the present invention has been completed.

The present invention uses pest control ingredients and a minimum film-forming temperature of 30% during spraying.
This soil pest control method is characterized in that a pest control layer is formed on the soil surface by spraying a mixed solution containing an aqueous resin emulsion at a temperature of 0.degree. C. or lower onto the soil surface.

Examples of the aqueous resin emulsion used in the present invention include resin emulsions of styrene/acrylic resin, vinyl acetate/ethylene resin, vinyl acetate/malate resin, etc. alone or in combination. The resin solid content in the emulsion is preferably 15% to 60% by weight. If the resin solid content is less than 15% by weight, the migration into the soil will be large and it will be difficult to form a stable pest control layer on the soil surface, and if it exceeds 60% by weight, workability will deteriorate and the formation of This is not preferable because the amount of the resin component in the pest control layer becomes too large and the amount of the pest control component becomes relatively small. The viscosity of the aqueous resin emulsion is 100 to 2000 centiboise (20
Celsius) is preferable; if it is less than 100 centivoise, there will be a lot of runoff into the soil (if it is more than 2,000 centiboise, the dispersion efficiency will be reduced).

The minimum film forming temperature (30℃ or less) is at the time of spraying,
Even if the film-forming temperature changes due to the addition of a solvent or the like, the final film-forming temperature must be 30° C. or lower. If it exceeds this range, even if the mixture is sprayed, a continuous pest control layer will not be formed on the soil surface, and the desired effect will not be obtained. Pest control ingredients are selected from known bactericides such as organophosphorus insecticides, pyrethroid insecticides, carbamate insecticides, and repellents p) depending on the application, and are usually added in a proportion within 5% by weight in the aqueous resin emulsion. Mix and use.

In the present invention, in addition to the above-mentioned components, known carriers such as kaolin (clay), colloidal silica, and calcium carbonate can be mixed into the mixed solution.

Further, the liquid mixture of the present invention is obtained by uniformly mixing and dispersing the respective components.

The liquid mixture of the present invention can be applied to the soil surface by using a commercially available sprayer or watering can, and can be applied to the surface of the soil, etc. depending on the purpose, such as under the floors of buildings, fields, gardens, etc. Spray on the surface.

Example 1 100 parts of aqueous vinyl acetate/ethylene resin (nonvolatile content = 55%, vinyl acetate ratio 73%, viscosity 1500 centivoise, minimum film forming temperature 3°C), 10 parts chlorpyrifos, 5 parts kaolin, and a bactericide (IP- 1000: Nagase Sangyo Co., Ltd.
After adding 75 parts of water to a mixture of 10 parts of
The spray was applied at a rate of 0.00 ml to form a pest control layer over a site area of approximately 60 square meters, and to prevent termites and fungi in the building. As a result, there was no damage at all until five years later.

Example 2 Styrene/acrylic aqueous resin emulsion (Acronal YJ-1595D: non-volatile content 53%, viscosity 4000 centiboise, minimum film forming temperature 20°C, manufactured by Mitsubishi Yuka Verditzche) 100 parts, permethrin 0.5 parts, chlortalonil 5 parts, water 94.5 parts of the mixture was mixed and 200 milliliters per square meter of the mixture was sprayed on the surface of the ridges of a chrysanthemum field using a watering pot to form a pest control layer. For comparison, in which ants did not approach until after 4 weeks, water was added to an emulsion consisting of 0.5 parts of permethrin, 5 parts of chlortalonil, 5 parts of an emulsifier (Tsurpol SM200: manufactured by Toho Chemical Industry Co., Ltd.), and 69.5 parts of xylol. After adding 100 parts, I sprayed it at a rate of 200 milliliters per square meter, but after two weeks I started seeing ants.

Effects of the Invention According to the method of the present invention, a pest control layer can be formed on the soil surface and pest control components can be retained on the soil surface, thereby preventing runoff due to rainwater, making it easy to remove residual soil, and reducing volatilization. This method is suitable as a method for controlling soil pests because it can also use reactive or unstable agents.

Claims (1)

[Scope of Claims] A pest control layer is formed on the soil surface by spraying on the soil surface a liquid mixture consisting of a pest control component and an aqueous resin emulsion with a minimum film-forming temperature of 30°C or less during spraying. A pest control method characterized by: