JPH082767B2 - Pest repellent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a repellent for agricultural crop pests, Thrips Palmi Kany.

<Prior art and its problems> Recently, especially Thrips palmi K
Damage to agricultural crops due to any) tends to increase significantly. The main crops harmed by this pest include, for example, cucumber, eggplant, bell pepper, citrus fruit, melon, bittern,
Many crops such as pumpkins, strawberries and other vegetables and chrysanthemums (petals) are seriously damaged.

This pest is a pest that is native to Southeast Asia, and was found in southern Kyushu in Japan in 1978, then moved north from Shikoku and Chugoku regions to the Kinki region, and is now spreading to the Kanto region.

As a method for controlling this pest, a conventional sulprofos emulsion,
Pesticides such as oxamyl granules, carbosulfan granules, fosalon powder / emulsion and BPMC emulsion are used. But,
There are many problems in using such pesticides effectively. That is, since this pest has a long egg-laying period and extremely remarkably proliferates, if an adult is observed to emerge, the pesticide must be sprayed at intervals of 4 to 5 days during that period to show any effect. A large number of sprays of pesticides may not only adversely affect the health of workers but also cause environmental pollution due to residual pesticides and disturbance of natural biota. Further, this pest has a drawback that it is highly resistant to drugs.

Recently, silver poly film is used on the surface of the cultivation area,
Although a method of covering the ridges to prevent pupation and having a repellent effect has been implemented, the present situation is that a sufficient controlling effect has not yet been shown.

<Purpose of the Invention> An object of the present invention is to provide a repellent for Thrips Palmi Kany, which is the most difficult pest to control.

<Means for Solving Problems> According to the present invention, the general formula (In the formula, R ₁ and R ₂ represent hydrogen or an alkyl group, and R ₃ represents hydrogen or an alkyl group or a lower alkenyl group.)
There is provided a Thrips palmi repellent, which comprises at least one of the thiazoles represented by the formula (1) as an active ingredient.

 The present invention will be described in more detail below.

The general formula of the thiazoles used in the present invention R ₁ and R _{2 each} represent hydrogen or an alkyl group, preferably an alkyl group having 1 to 20 carbon atoms, and more preferably 1 to 10 carbon atoms.
Is an alkyl group. R ₃ represents hydrogen or an alkyl group,
It is preferably an alkyl group having 1 to 20 carbon atoms, more preferably an alkyl group having 1 to 10 carbon atoms or a lower alkenyl group, and preferable examples thereof include a vinyl group and a propenyl group. When R ₁ , R ₂ and R ₃ are alkyl groups having 21 or more carbon atoms, the production becomes difficult.

Examples of the thiazole compound represented by the above general formula that can be used in the present invention include thiazole and 2-
Methylthiazole, 2-ethylthiazole, 2-propylthiazole, 2-isopropylthiazole, 2-butylthiazole, 2-isobutylthiazole, 2-secondarybutylthiazole, 2-pentylthiazole, 2
-(2'-methylbutyl) thiazole, 2- (3'-methylbutyl) thiazole, 2-hexylthiazole, 2
-Heptyl thiazole, 2-octyl thiazole, 2-
Nonyl thiar, 2-decyl thiazole, 4-methyl thiazole, 4-ethyl thiazole, 4-propyl thiazole, 4-isopropyl thiazole, 4-butyl thiazole, 4-isobutyl thiazole, 4-secondary butyl thiazole, 5-methyl thiazole, 5- Ethylthiazole, 5-propylthiazole, 5-isopropylthiazole, 5-butylthiazole, 5-isobutylthiazole, 5-secondary butylthiazole, 2,4-dimethylthiazole, 2,5-dimethylthiazole, 4,5-dimethylthiazole, 2,4,5-trimethylthiazole, 2
-Methyl-4-ethylthiazole, 2-methyl-5-ethylthiazole, 2,4-dimethyl-5-pentylthiazole, 2,4-diethyl-5-propylthiazole, 2-
Ethyl-4-butyl-5-methylthiazole, 2,5-diethyl-4-propylthiazole, 2-propyl-4-
Ethyl-5-methylthiazole, 2-isopropyl-4
-Methylthiazole, 2-isopropyl-4-methyl-
5-methylthiazole, 2-butyl-4-methyl-5-
Ethylthiazole, 2-butyl-4-propylthiazole, 2-isobutyl-5-methylthiazole, 2-pentylthiazole, 5-pentylthiazole, 2-pentyl-4-methylthiazole, 2-pentyl-5-methylthiazole, 2 -Pentyl-4-ethylthiazole, 2
-Pentyl-4-propylthiazole, 2-pentyl-
4-methyl-5-ethylthiazole, 2-hexyl-4
-Ethylthiazole, 2-heptyl-4,5-dimethylthiazole, 2-heptyl-4-ethylthiazole, 2-
Heptyl-4-ethyl-5-methylthiazole, 2-octyl-4,5-dimethylthiazole, 2-octyl-4
-Ethylthiazole, 2-octyl-4-propylthiazole, 2-methyl-5-vinylthiazole, 4-methyl-5-vinylthiazole, 2,4-dimethyl-5-vinylthiazole and the like can be mentioned.

In the present invention, the thiazoles in many foods,
For example baked poteto, roasted peanuts, roasted beef
beef), cocoa butter, fried bacon, fried chick
However, since thiazoles have various characteristic aromas, many synthetic products are marketed as flavor materials and they can also be used. It is possible.

As a synthetic method, a synthetic method in which thioamide is reacted with α-bromoketone or α-bromoaldehyde by the method of Kurkjy and Brown (J. Amer. Chem. Soc. 74 , 5778, 1952) can be mentioned as an example. .

The repellent of the present invention may be used alone or in combination of two or more selected from the group consisting of the thiazole compounds. Further, it is dissolved, mixed or adsorbed in a suitable carrier (liquid or solid), and if necessary, an auxiliary agent such as a stocking agent or a dispersant is added to make an oil, emulsion, wettable powder, granule, tablet. Also, it can be used in a dosage form such as an aerosol.

Examples of the solvent used for the formulation include alcohols such as ethyl alcohol, isopropyl alcohol, ethylene glycol and propylene glycol, ketones such as acetone and methyl ethyl ketone, dioxane, tetrahydrofuran, ethers such as methyl selve, hexane, kerosene and paraffin. And aliphatic hydrocarbons such as petroleum benzine, α- and β-pinene and limonene; aromatic hydrocarbons such as benzene and toluene, and esters such as ethyl acetate, butyl acetate and amyl.

Examples of the solid carrier include silicate, calcium silicate, kaolin, bentonite, talc, acid clay, calcium carbonate, mineral powder such as alumina, activated carbon, starch, vegetable powder such as soybean powder and cyclodextrin. An inclusion compound etc. can be mentioned.

Examples of the emulsifiers and dispersants include polyoxyethyl alkyl ethers, polyoxyethylene alkyl allyl ethers, polyoxyethylene fatty acid esters, fatty acid glycerides, sorbitan fatty acid esters, higher alcohol sulfates, and casein. ,
Vegetable-based natural resins such as gelatin, agar, CMC and gum arabic can be used. Furthermore, as the aerosol propellant, for example, liquefied petroleum gas, dimethyl ether, fluorocarbon and the like can be used.

In addition, the pest repellent of the present invention may also contain a potentiator, an antioxidant, an insecticide, a flavoring agent, a coloring agent and the like.

The method of using the repellent of the present invention may be such that a scent (smell) drifts around the area of a crop to be protected from Thrips Palmi Kany by spraying it or applying it to a sheet substrate, etc. For example, any method can be used.

The application amount of the active ingredient represented by the general formula contained in the repellent of the present invention can be appropriately determined according to the dosage form, application method, application site, etc., and is not necessarily limited. For example, when it is used in the form of a liquid phase such as a dispersant or a wettable powder, it is desirable to contain the active ingredient in an amount of 0.1 to 30% by weight, preferably 1 to 10% by weight. Further, in the case of a solid form such as powder or granules, it is desirable to contain the active ingredient in an amount of 0.1 to 30% by weight, preferably 1 to 20% by weight, and when it is held on a sheet base material (synthetic resin, nonwoven fabric, etc.) Is preferably impregnated in an amount of about 1/3 of the saturated impregnation amount of the sheet base material.

Further, the minimum effective concentration of the pest repellent obtained by the present invention, for example, spraying, when applied, 0.1 mg / m ² or more, when used in the form of a solid or sheet substrate or the like, 0 in the application space .
It is appropriate to volatilize at 1 ppm or more.

<Effects of the Invention> By using the pest repellent of the present invention, a very excellent repellent effect on Thrips Palmi Kany can be obtained.

<Example> The present invention will be described in more detail with reference to Examples and Comparative Examples.

Outline of test equipment Figure 1 shows the test equipment used for this test. The reaction measuring chamber (made of glass) 1 is a container having a length of 20 cm, a height of 4 cm, and a width of 15 cm (internal volume of about 1200 cm ³ ), and a partition wall 2 for dividing the container into equal parts is provided, but it is equally divided. Both chambers 3 and 4 communicate with each other below the partition wall 2. The one chamber 3
Has a wide-mouth glass bottle 6 containing a sample (pest repellent) 5 and a glass tube 7 connected by a glass tube, and the other chamber 4 is connected by a glass tube 8 to an empty wide-mouth glass bottle 9. The flow of air passes through the air purifier (filled with activated carbon) 12, part of which flows from one wide-mouth glass bottle 6 into one chamber 3, and the rest flows from the other wide-mouth glass bottle 9 into the other chamber 4, Both chambers 3 and 4 are connected to a flow meter 13, a flow rate adjusting cock 4 and a water flow pump 11 through bifurcated glass tubes.

Test method Using the above-mentioned apparatus, 50 Southern Thrips thrips (adults) were placed in the reaction measurement chamber 1, then the sample 5 was placed in the wide-mouth glass bottle 6, and then the water flow pump 11 was operated (air flow rate).
300 ml / min).

In this case, the sample in one sample bottle 6 evaporates and flows into the chamber 3 together with air. Therefore, if the odor of the sample has a repellent effect on Thrips palmi thrips, the Thrips palmi thrombosis exhibits repellent behavior and escapes to the other chamber 4. There will be approximately equal numbers in chambers 3 and 4.

To determine the effect, observe and record the number of transfers of Thrips palmi thrips immediately after sample introduction and 10 minutes after that (average of 3 times in total)
As a result, the number of Thrips palmi thrombus present in the odor airflow chamber 3 of the sample was shown by the following evaluation method.

Display ++++ ・ 4 or less (with strong repellant effect) ++ ・ ・ ・ 5-9 animals (with repellant effect) ＋ ・ ・ ・ 10-14 animals (with some repellent effect) ± ・ ・ ・ ・ 15-19 animals (Almost no repellent effect) --- 20 or more animals (no repellent effect) <Example 1> Using the test apparatus, commercially available thiazole, 2
-Methylthiazole, 2-isopropylthiazole, 2
-Isobutylthiazole, 2-secondary butylthiazole, 2- (2'-methylbutyl) thiazole, 2-
(3'-methylbutyl) thiazole, 2-heptylthiazole, 2-octylthiazole, 4-methylthiazole, 4-propylthiazole, 4-isobutylthiazole, 5-methylthiazole, 5-isopropylthiazole, 5-isobutylthiazole, 2, 4-dimethylthiazole, 4,5-dimethylthiazole, 2,4,5-trimethylthiazole, 2,4-dimethyl-5-pentylthiazole,
2-ethyl-4-butyl-5-methylthiazole, 2-
Propyl-4-ethyl-5-methylthiazole, 2-isopropyl-4-methylthiazole, 2-butyl-4-
Methyl-5-ethylthiazole, 2-isobutyl-5-
Methylthiazole, 2-heptyl-4,5-dimethylthiazole, 2-octyl-4,5-dimethylthiazole, 2
-Methyl-5-vinylthiazole, 4-methyl-5-vinylthiazole and 2,4-dimethyl-5-vinylthiazole were added to propylene glycol in an amount of 10% by weight, and the total amount was 100 mg. The experiment was conducted according to the test method. The results are shown in Table I.

<Comparative Example 1> Propylene glycol (P.
G) 100 mg was put in a wide-mouth glass bottle 6 and an experiment was conducted according to the above-mentioned test method. The results are shown in Table I.

As is clear from Table I, the repellents of the present invention repelled Thrips palmi thrips.

Preparation of Granules 2-Isopropylthiazole 0.3% 2-Isobutylthiazole 0.5% 2-Isobutyl-5-methylthiazole 0.2% Limonene (solvent) 99.0% 100 (wt%) <Example 2> Prepared with the above formulation Impregnate the repellent plastic material into calcium silicate granules (Florite RM: Tokuyama Soda Co., Ltd.) (2
60 g of the repellent agent prepared above was placed in the vinyl house in the repellent area in two greenhouses (a repellent agent area and a control area) in the same area. (Battery motor, fan system), 10 aroma units were placed at equal intervals, and the arrival of Thrips palmi was observed.

To determine the effect, hang 10 adhesive tapes in each vinyl house (repellent area, control area) at appropriate intervals, and after 2 weeks, fly to the vinyl house and capture it on an adhesive tape. Surveyed the number of. The results are shown in Table II.

As is clear from Table II, the repellent of the present invention showed an excellent repellent effect against Thrips palmi thrombosis (adult).

[Brief description of drawings]

FIG. 1 is a schematic view showing the experimental apparatus used in Example 1.

Claims (1)

[Claims] 1. A general formula (In the formula, R ₁ and R ₂ represent hydrogen or an alkyl group, and R ₃ represents hydrogen or an alkyl group or a lower alkenyl group.)
And a repellent of Thrips palmi Thrips, which comprises at least one of the thiazoles represented by as an active ingredient.