JPS597101A - Attractant insecticide for controlling fruit fly - Google Patents

Abstract

PURPOSE:The titled insecticide, containing microcapsules containing a mixture of an attractant for fruit flies with an insecticide as a core material and a binder for adhering the microcapsules to plant bodies with a slight drift even on use in the aerial application, and having a high residual effect. CONSTITUTION:An attractant insecticide prepared by incorporating (A) flocculating type microcapsules, containing a substantially water-insoluble mixture of an attractant for fruit flies, e.g. Zeugodacus cucurbitae Coquillet, 4-(p-acetoxyphenyl)-2-butanone, with an insecticide for the fruit flies, e.g. O,O-dimethyl O-(3- methyl-4-nitrophenyl)thiophosphate, as a core material, and having a membrane material consisting essentially of gelatin and 20-150mu average particle diameter with (B) water and (D) a high polymeric emulsion or water-soluble polymer capable of forming films on evaporation of water as a binder. The insecticide may efficiently be aoplied to (1/5)-(1/15) of the area for controlling in dots, and the amount of the chemical to be applied per unit area is reduced to prevent the danger.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an insecticide attractant useful for controlling fruit flies. More specifically, the present invention provides 1) a material with an average particle size of 20 ml containing a substantially water-insoluble mixture of a fruit fly attractant and a fruit fly insecticide as an internal phase and formed of a membrane material mainly composed of gelatin. ~150μ aggregated microcapsules, 2) water, 3) a polymer emulsion or water-bathable polymer capable of forming a film by evaporation of water and fixing the microcapsules to plants (hereinafter referred to as a fixing agent). This is an attractive insecticide for controlling fruit flies consisting of the above 1) to 6).

According to the present invention, fruit flies can be effectively controlled in the following ways.

1) Since it is a microencapsulated agent containing a mixture of an attractant and an insecticide as its internal phase, it can be sprayed over an area approximately 115 to 1/15 of the area to be controlled.

++) Since it is a microcapsule suspended in water, it is suitable for aerial spraying and has little drift.

111) Since it is an agglomerated microcapsule with an average particle size of 20 to 150 μm and uses a fixing agent, it has excellent residual effect compared to emulsions.

Because of the above features and advantages, it can be used to control fruit flies such as the melon fruit fly, citrus fruit fly, and Mediterranean fruit fly, and it can be used to effectively control fruit flies.
I can do it.

As attractants and insecticides used for this purpose, commonly known agents are used, and preferably the following can be mentioned. In these, the characters in [ ] represent the chemical name, and [
The name before ] indicates the product name.

That is, as attractants for fruit flies, cuurua [4-(p-acetoxyphenyl)-2-butanone] is used for the medicinal fruit fly, methyleugenol is used for the orange fruit fly, and metrua (5ec-butyl-) is used for the Mediterranean fruit fly. 1rans-4(or5) chloro-2-methylcyclohexane-1-carboxylate], trimetroua(tert-butyl-1rans-4(or 5)
) Chloro-2-methylcyclohexane-1-carboxylate] Many insecticides for fruit flies are known, such as sumithion (0,0-dimethyl-〇-(3-methyl-4 -nitrophenyl)thiophosphate], marathon (0,0-dimethyl-8-(1,2
-dicarpoethoxymethyl)dithiophosphate, dibromo[dimethyl-1,2-dibromo-2,2-dichloroethylphosphate]sudo are commonly used.

When selecting these attractants and insecticides, in addition to being effective against fruit flies, the attractants and insecticides should be mixed uniformly in a ratio of preferably 1:9 to 9:1, and the mixture should be is substantially insoluble in water.

The mixing ratio of attractant and insecticide is the one that has the best control effect.
You just have to choose as you see fit.

If this mixing ratio is out of the above range, either the attraction or insecticidal effects will be biased, and there is a risk that an excellent pesticidal effect may not be obtained. Particularly preferably, the mixing ratio is 2:8 to 8:2.

Microcapsules containing a mixture of an attractant and an insecticide as an internal phase have a gelatin-based membrane material, and can be produced by a complex or coacervation method from an aqueous solution.

Known compounds that make gelatin and coacervate include gum arabic, carrageenan, carboxymethylcellulose, sodium polyacrylate, maleic acid copolymer, and sodium hexametaphosphate. For example, U.S.
P2,800,457, U8P2,800,458, B
Pl, 117,178, Japanese Patent Publication No. 48-17985, and the like.

In the present invention, the average particle size of 2
Agglomerated microcapsules of 0 to 150μ are used.

2 to 10% of internal phase oil, which is a mixture of attractant and insecticide.
By appropriately selecting the encapsulation conditions such as PH1 temperature, agglomerated microcapsules with an average particle size of 20 to 150 μ can be produced.

If the average particle size of the microcapsules is less than 20μ, it is undesirable because it tends to drift and has a low residual effect.If the average particle size exceeds 150μ, the localization of the pesticide reduces its efficacy. In addition, there is a risk of clogging the nozzle of the aerial spraying device. For these reasons, a range of 30 to 100 μm is particularly preferable.

The microcapsules used in the present invention produced by phase separation from an aqueous solution are in a state in which the microcapsules are suspended in water, and a polymer emulsion or water-soluble polymer, which is formed into a film by evaporation of water, is added as a fixing agent to the microcapsules. Added.

As the polymer emulsion, an acrylic emulsion or a vinyl acetate emulsion as shown in 11883/1983 can be used.

As the water bathing polymer, polyvinyl alcohol, sodium polyacrylate, polyvinylpyrrolidone, xanothane gum, etc. can be used. The appropriate amount of these fixing agents used is 5 to 30% by weight of the solid content based on the microcapsules. . This fixing agent is used to fix the microcapsules to the plant body and to prevent them from falling off due to rain and wind. Therefore, by using a fixing agent, agricultural chemicals can be used more effectively and their residual effectiveness can be increased.

Further, this fixing agent may be added in advance or may be added immediately before spraying.

The following compounds can be added to this insecticide attractant as necessary.

■ Dispersing agents such as polyacrylic soda and clay to improve the dispersibility of microcapsules ■ Surfactants to reduce the surface tension of the water layer and increase the amount of pesticides attached ■ Attracting water bath liquid The microcapsules of the present invention are agglomerated with a gelatin-based membrane, but the use of a gelatin membrane has the following advantages::) It is highly safe and naturally occurring. Easy to disassemble.

il) Gradual elution of the drug on contact with water.

II) Preventing the decomposition of pesticides by light and preventing their dispersion 1■)
The coacervation method using gelatin is an industrially established method for producing stable microcapsules.

Furthermore, being an agglomerated type has the following advantages.

I) It has a large surface area and is easily eluted, so it has high initial efficacy.

11) Better adhesion to plants than mononuclear microcapsules.

1ll) Superior residual efficacy compared to mononuclear type microcapsules with the same average particle size; +V) Microcapsules with a narrow particle size distribution are easier to produce than mononuclear type.

When actually spraying, the material can be diluted with water to a predetermined raw material concentration before being sprayed, and in the case of aerial spraying, it is usually sprayed at a liquid volume of 81 to 50 parts per hectare. In this case, since it is an attractant insecticide, it is efficient because it only needs to be sprayed pointwise over 115 to 1/15 of the area to be controlled, and the amount of sprayed per unit area is also low, which prevents damage.

Geru.

Example 1 Agglomerated microcapsules having an average particle size of 100 μm and containing Sumithion/Cuurua=+o15 [: weight ratio] as the internal phase were produced according to Example 1 of Japanese Patent Publication No. 4B-17985.

In this case, the average particle size of the internal phase oil was 8 microns, and the membrane material was 20% by weight of the internal phase.

A potted tangerine plant was placed in the outdoor rope room, and an insecticide with the following composition was sprayed on it.

Xt Chi After drying, the uriminos reared on artificial feed were released.

When the insecticidal effect was examined after 24 hours, the insecticidal effect was observed until 15 days later.

Comparative Example 1 An attracting insecticide was prepared in the same manner as in Example 1 except that it was made into mononuclear microcapsules, and the attracting insecticidal effect was examined after 24 hours. As a result, no attracting insecticidal effect was shown after 10 days.

Example 2 Sumithion/methyleugenol = 1015 [weight ratio]
Agglomerated microcapsules having an average particle size of 50 μm and having the internal phase substance were produced according to Example 1 of Japanese Patent Publication No. 17985/1983. In this case, the average particle diameter of the internal phase oil was 5 μm, and the membrane material was 10 M, the amount of the internal phase oil. The attracting insecticide with the following composition showed attracting and killing effects on Citrus fruit fly.

Weight % Example 6 Agglomerated microcapsules with an average particle size of 50 μm containing Marathon/Trimetrore = 4/6 (weight ratio) as the internal phase,
It was manufactured according to Example 1 of Japanese Patent Publication No. 4B-17985.

In this case, the average particle size of the internal phase oil was 5 μm, and the membrane material was 20% by weight of the internal phase.

The attracting insecticide having the following composition showed attracting and killing effects on the Mediterranean fruit fly.

Example 4 Agglomerated microcapsules of 20 to 80 μm containing Sumithion/Cuturua I 015 (3H1 ratio) as the internal phase were produced according to Example 1 of Japanese Patent Publication No. 17985/1985.

In this case, the oil particle size of the internal phase is 4 to 6 microns, and the membrane material is 12% by weight of the internal phase.

A medically formulated attractant and insecticide was prepared, and a 1/10-spot distribution was carried out on the melon fly habitat using a helicopter. The application rate was 81/ha.

As a result of the spraying, the sprayed area showed a decrease in the density of the fruit fly for 15 days.

Patent applicant name Toagosei Chemical Industry Co., Ltd. Agriculture, Forestry and Fisheries Aviation Association A

Claims (1)

[Scope of Claims] t. An average particle size of 20 to 20, which is formed from a film material mainly composed of gelatin, with an internal phase containing a substantially water-insoluble mixture of a fruit fly attractant and a fruit fly insecticide. Agglomerated microcapsules of 150μ, 2) water, 3) a polymer emulsion or water-soluble polymer capable of forming a film by evaporation of water and fixing the microcapsules to the plant body, and the above υ~3) are also fruit flies. Attractive insecticide for controlling insects.