JPH0749367B2 - Termite termite repellent - Google Patents

Description

TECHNICAL FIELD The present invention relates to termite termite repellents.

[Conventional technology and its problems] The damage to households and trees by termites has been increasing in recent years, and it is said that the damage amount to several tens of billion yen per year in Japan alone. Therefore, various studies have been conducted on the termite control agent, and a considerable number of termite termite control agents are actually put to practical use. However, there are many habitats for termites, and therefore, a large amount of termite repellent may be used so as to be as complete as possible in one application and to keep the termite control effect for a long time. In such cases, on the one hand, vertebrate safety issues arise. That is, if the termite termite repellent is applied to the base or soil of a house or livestock, it must be highly safe against vertebrates. However, the termite termite control agents currently used are mainly halogen compounds, arsenic compounds, mercury compounds, organic tin compounds, etc., but these compounds are extremely toxic and pollute the environment, so toxicity and environmental pollution. There has been a strong desire in the past for non-functional alternatives.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a termite termite control agent having a high termite control effect against termites and a high safety against vertebrates.

[Means for Solving Problems] As a result of searching various plants in order to achieve the above-mentioned object, the present inventors have found that the horseradish extract has termite-preventing activity and completed the present invention. .

The present invention is characterized by using, as an active ingredient, a horseradish extract extracted from a Polygonaceae plant with an organic solvent.

Some of the Polygonaceae plants used for the termite termite repellent of the present invention are harmless to the human body, as some are commonly eaten on sashimi sushi and the like. Any of the soybeans may be used as long as it has a spicy taste, but anagidade having a strong spicy taste is preferable, and cultivars such as benitade, murasakitade and hirohamrasakitade are also selected. In addition, the soup stock may be fresh soup stock immediately after being cut or may be dried. In this case, the drying may be natural drying or forced drying by heating to about 70 ° C. This extraction can be performed by immersing the leaves or whole plants of such polygonum in a hydrophilic organic solvent. The extraction can be performed using another organic solvent, but a hydrophilic organic solvent is preferable in consideration of the subsequent treatment. Examples of the hydrophilic organic solvent include methanol,
Lower alcohols such as ethanol and isopropanol or ketones such as acetone and methyl elker ketone can be used. Of these, methanol is most suitable in terms of extraction efficiency concentration operation. Extraction is performed by immersing the raw materials such as the Japanese cedar leaves or whole grass or a part thereof in the above organic solvent and heating under reflux for a predetermined time. Using dried willow radish as a raw material and heating and refluxing for 7 hours with about 10 times the amount of methanol as the raw material, a solvent-free polyphenol extract can be obtained with a yield of about 10% (w / w). it can.

The soybean extract thus obtained is a dark green viscous substance that smells like grass, and has a pungent taste when contained in the mouth. And this polygonum extract is hardly soluble in water, and this property is very convenient for wood termite repellents and the like. In addition, since the termite termite repellent is applied under the floor in general households, the dark green color of the Japanese soybean extract does not become a problem and does not cause a problem in soil treatment. If the color is too dark, it is possible to decolorize it using activated carbon for decolorization, but even if it is done, the termite activity of the Japanese horse mackerel extract is not lost.

The termite termite repellent of the present invention is used for treating wood or woody materials or soil, etc., and is a preparation such as oil, emulsion, granule, powder, pasty wettable powder, foam smear, and paint depending on the purpose of use. Adjusted to. An organic solvent can be used if necessary, and examples of the organic solvent that can be used include aromatic hydrocarbons, alicyclic hydrocarbons, aliphatic hydrocarbons, alcohols, glycol ethers, ketones, and esters. Examples of such solvents include those commonly used for dilution, and these solvents may be used alone or in combination.

The content of the horse mackerel extract in the termite termite control agent and the application amount of the termite termite control agent may be appropriately determined according to the dosage form, application method, application site, etc. Even in the case of powders and other solid agents, add 0.05%
90% by weight, preferably 0.1 to 50% by weight.

Further, the termite termite control agent of the present invention may be blended with a wood preservative or a wood fungicide which is usually used, or may be blended with a penetration aid, a fixing agent, a surfactant, a colorant and the like.

[Working] Polygonum soybean extract, which is extracted from the Polygonaceae plant with an organic solvent, is harmless to vertebrates and has a repellent action against termites.

In addition, since the above-mentioned Japanese horse mackerel extract is insoluble in water, it shows a high residue on the application site and maintains termite ant-controlling ability for a long period of time.

[Examples] Hereinafter, the present invention will be described with reference to specific examples.

Production Example: First, a Japanese horse mackerel extract was obtained as follows.

50 g of dried whole soybean soup was heated and refluxed with 500 ml of methanol for 1 hour, the plant residue was filtered off, and the resulting methanol extract was concentrated to obtain 5 g of a solvent-free soy sauce extract.

Comparative test: Next, the potency test of the Japanese horse mackerel extract obtained above was carried out as follows by using a blank without the termite control agent and a commercially available tin-based termite control agent.

Normal American pine and Toga sapwood (5 cm × 5 cm × 1.5 cm rectangular parallelepiped), each of which had a planer smoothed on each side, were dried at 60 ± 2 ° C for 24 hours, and the weight was measured. Weight before absorption). Each sapwood was impregnated with a 3% methanolic solution of the horse mackerel extract at normal pressure for 24 hours, and the weight was measured again (weight after drug absorption). Then, the sample was dried again at 60 ± 2 ° C. for 24 hours, left in a desiccator for about 30 minutes, and weighed (W ₁ ) to give a test sample. As a breeding container, a glass container having a diameter of 8 cm and a height of 6 cm was used, and soil was put thereinto in a thickness of about 4 cm in advance. Yamato termite worker ants randomly removed from the nest in the above container
150 heads and 2 ants were put in, and one treated test piece was placed horizontally. After the container was left to stand for 31 days for breeding, the test specimen was taken out from the breeding container, adhered to the surface of the specimen was removed, dried at a temperature of 60 ± 2 ° C. for 24 hours, left in a desiccator for about 30 minutes, and then weighed. (W ₂ ).

The weight reduction of the test body was calculated by the following formula.

Weight reduction rate = {100 × (W ₁ −W ₂ ) / W ₁ } In addition, a blank with the sapwood itself, which does not use any termite proof, as a test body, and a commercially available tin-based termite control agent are used in the same manner as above. A commercial termite control agent treated with a drug or a sample was tested in the same manner as above to measure the weight reduction rate. The result is first
Shown in the table.

According to Table 1, it can be understood from the comparison with the blank that the horseradish extract according to the present invention has a remarkable termite-controlling ability against termites. Understand that it is also excellent.

Next, a specific example of actually using the Japanese horse mackerel extract obtained by the above means is shown.

Example 1 (Direct Application of Solution) A xylene solution of Polygonum soybean extract was applied to the surface of a 30 mm × 30 mm × 350 mm test pile (sapwood of Japanese red pine) and dried to obtain a treated test body. At the field test site in Kiyoshin, Sagamihara City, Kanagawa Prefecture, the above-mentioned treated specimen and the untreated specimen of the same material and the same size were tested for the termites. The test method was based on the field test method of the termite efficacy test method No. 1 of the Japanese termite countermeasures association.

As a result, the test body treated with the termite control agent of the present invention showed no food damage even after one year and no decay. On the other hand, the untreated test body suffered from feeding damage and had to be replaced with a new test body every six months.

Example 2 (Soil Treatment with Emulsion) Tade extract 20.0 parts by weight Dimethylformamide 35.0 Acetophenone 35.0 Alkylbenzene sulfonic acid 3.0 Polyoxyalkylene alkyl ether 7.0 20% by weight of the Tade extract was prepared by uniformly mixing and dissolving the compounds shown in the above formulation. A containing solution was prepared. This solution was uniformly emulsified when diluted with water, and this diluted solution (10% by weight of the Japanese radish extract) was used as a soil treatment agent and tested in accordance with Japan Termite Countermeasures efficacy test method No. 9. That is, an emulsion obtained by diluting the above-mentioned solution 10 times with water using a test pile having the same specifications as those of Example 1 and a test pile having the same specifications and a termite of the same type was 2 / m ^2.
The soil treated by addition was used as a soil treatment group, and a test pile was driven into each of the soil-untreated control groups and observed. As a result, the piles driven into the treated area were not found to be damaged by termites one year later, but the piles in the control area reached a weight reduction rate of 80% in one year, and the original shape was hardly stopped.

Example 3 (Soil treatment with powder or granules) Polygonum extract 10.0 parts by weight Silicic anhydride (fine powder) 0.5 Talc 89.5 The above ingredients are uniformly pulverized and mixed to obtain the active ingredient (polygonum extract).
A powder containing 10% was obtained.

Polygonum extract 10.0 parts by weight Clay 67.0 Alkylbenzenesulfonic acid 10.0 α-starch 3.0 Water 20.0 The above formulations were uniformly mixed, granulated and dried to obtain granules containing 20% of the active ingredient (polygonum extract).

These powders and granules were treated in the same manner as in Example 2. As a result, the same result as in Example 2 was obtained.

From the results of Examples 1 to 3 described above, it was confirmed that the termite control agent of the present invention has not only an effect of controlling termites but also a remarkable sustainability of the effect.

[Effects of the Invention] As described above, according to the present invention, since the extract of Polygonaceae plants that is also used for food is used as an active ingredient,
The active ingredient itself has no toxicity to vertebrates and has no adverse effect on the natural environment, and can be safely used.

In addition, because the termite extract has a remarkable termite-preventing effect on termites and its sustainability is remarkable, a long-term termite-preventing effect can be obtained with a single specification, and the number of times of application and the amount of application can be reduced.

Claims (1)

[Claims] 1. A termite ant-preventing agent, which comprises a Japanese soybean extract extracted from a Polygonaceae plant with an organic solvent as an active ingredient.