JPH04208208A - Mite repellent in agricultural greenhouse and system therefor - Google Patents

Abstract

PURPOSE:To obtain the title sustained release repellent of long-term sustainability and system therefor, by adsorbing peppermint oil to a silica gel carrier or by combining the resultant carrier with a styrene-based resin compatible with the peppermint oil. CONSTITUTION:Peppermint oil, a natural extract low toxic to human health, is adsorbed to a silica gel carrier to ensure the active ingredient to be controlled so as to transpire only when needed. The resulting composition is then made into such a form as to be moorable or applicable in an agricultural greenhouse, thus obtaining the objective mite repellent. Also, it is preferable that said composition be used in a liquid form by mixing it with styrene-based resin powder, paste, an alcoholic solvent etc. And it is preferable to use such a system that said repellent composition 1 is packed in a chamber 2 equipped with a window fitted with a netty filter and a member 3 moorable in a greenhouse or settable on a ridge.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tick repellent and a tick repellent device installed in an agricultural greenhouse.

Conventional technology Insecticides have traditionally been used to combat harmful spider mites, two-spotted spider mites, and red mites that damage agricultural crops.
In addition, greenhouses and greenhouses are prone to dry conditions during the day, causing frequent damage to mites in particular. In these greenhouses and greenhouses, fumigants are often used to exterminate pests by filling the interior with a gas that has an insecticidal effect by taking advantage of the airtight nature of the greenhouse.

Problems to be Solved by the Invention However, conventional insecticides and fumigants contain many substances that are harmful to the human body, including organic phosphorus compounds, and residual pesticides after crops are harvested have become a problem. Recently, the resistance of ticks to the above pesticides has increased, making it difficult to exterminate them inside greenhouses. Therefore, even more powerful pesticides are being developed. On the other hand, as pesticides have become more powerful as mentioned above, there are concerns that they may cause problems due to respiratory inhalation and skin contact during pesticide spraying work, and have even become a social problem from the health perspective of pesticide sprayers. Nevertheless, these remain unresolved issues to date.

The present invention solves the above-mentioned problems, and aims to provide an excellent tick repellent and tick repellent device that has low toxicity when imprinted on the human body and exhibits a sustained pest repellent effect.

Means for Solving the Problems The present invention is directed to achieving the above objects. Mint oil, a natural extract with less toxicity to the human body, is used as a pest repellent (\ its active ingredients can be diffused at the required time). Specifically, the mite repellent is made by using silica gel as a carrier and carrying peppermint oil on it.

Function: Mint oil, a naturally occurring substance with low toxicity to the human body, is used as a repellent, so it is highly safe. Further, by appropriately selecting the pore size and the actual bore depth of the silica gel used as a carrier, the gas evaporation rate depending on the ambient environmental humidity can be adjusted.

FIG. 2 is a diagram showing changes in gas evaporation due to changes in ambient environmental humidity of silica gel suitable for this application. For example, in the case of a repellent using silica gel as a carrier and impregnated with peppermint oil and having the characteristics shown in the figure, the evaporation of the drug is suppressed at higher humidity than 60% R1H, whereas it is accelerated at low humidity.

From this, the repellent impregnated with peppermint oil releases peppermint oil slowly in low humidity areas, and in high humidity areas, transpiration of peppermint oil slows down due to the hygroscopicity of silica gel, resulting in increased activity of ticks. By slowly releasing peppermint oil during the day and suppressing the transpiration of peppermint oil during the night, it is possible to efficiently control the transpiration of peppermint oil and extend its medicinal efficacy.

Furthermore, by combining it with a styrene resin that is compatible with mint oil, it is possible to maintain sustainability for an even longer period of time.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 and 2.

Example 1 FIG. 2 shows the moisture absorption and release state of silica gel suitable for the use of the present invention when the ambient environmental humidity changes.

In Figure 1, 1 is a repellent composition, which is made of silica gel with a particle size of 2 to 3 mm having the characteristics shown in Figure 2 as a carrier, dried at 180°C for 4 hours, sufficiently impregnated with peppermint oil, and air-dried. It was prepared using

On the other hand, the housing 2 is made of a paper box with a mesh affixed to the four sides to prevent the silica gel from escaping, or a bag-like housing (not shown) made of a material with low mint oil diffusion resistance such as Japanese paper. Prepare and fill it with the repellent composition 1.

A suspension member 3 that can be moored from the ridge beam of the greenhouse plastic house is provided on the upper part of the housing 2 to facilitate gas diffusion into the greenhouse plastic house.

Example 2: The repellent composition of this example with the above structure impregnated with 100 ml of mint oil was installed in a glass greenhouse at intervals of 2 to 4 m, and the repellent effect on mites was observed for about half a year. Silica gel having the same characteristics as in Example 1 above was prepared with a particle size of 0.
．． A repellent composition is prepared by impregnating a carrier crushed to 1 mm or less with peppermint oil in the same manner as in Example 1 above. This includes a liquid agent containing styrene resin powder such as AS, ABS, and styrene resin, which are compatible with peppermint oil, a sizing agent that improves the applicability on agricultural films, and an alcohol-based solvent that does not easily affect agricultural crops. Prepared and used as a repellent.

The above-mentioned repellent exhibits a repellent effect against mites when sprayed or applied to the structural members of greenhouses, greenhouses, agricultural materials such as mulch film, etc.

Example 3 Silica gel having the same characteristics as in Example 1 above was prepared with a particle size of 1
A composition is prepared by impregnating a carrier pulverized to a size of 0 to 100 microns with peppermint oil in the same manner as in Example 1. For this purpose, a repellent is prepared by coating the surface of the composition with fine powder of a styrene resin such as AS, ABS, or styrene resin, which is compatible with peppermint oil, by a method such as hybridization.

This material can have a long-term repellent effect by suspending it in a greenhouse or plastic greenhouse in the same manner as in Example 1, or by spraying it in areas that are not directly exposed to water.

It goes without saying that the peppermint oil used as a repellent has the same effect whether it is natural peppermint oil or synthetic peppermint oil with the same components. As such, the tick repellent of the present invention
It is a silica gel carrier impregnated with peppermint oil that suppresses the transpiration and slow release of peppermint oil depending on the humidity changes in the environment in which it is used.This allows the peppermint oil's effectiveness against mites to be maintained over a long period of time when needed. It can be released in a sustained manner. Furthermore, the sustained release property can be extended for an even longer period of time by combining mint oil with a styrene-based resin that is compatible with it.

Since greenhouses and greenhouses are highly closed facilities, such transpiration repellents are extremely effective. Furthermore, since the temperature and humidity of the cultivation environment in greenhouses and greenhouses vary greatly, using silica gel as a carrier, which changes gas transpiration performance depending on the environmental humidity, allows the necessary evaporative gases to be evaporated into the greenhouse or greenhouse when needed. The effect against pests is permanent.

Repellents using mint oil, which is naturally occurring and has low toxicity, remain in the crop after harvest and are safe if contacted by the sprayer during the field or spraying process.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional perspective view of an embodiment of the present invention. FIG. 2 is a diagram showing the moisture absorption and release state of silica gel suitable for use in the present invention when the ambient environmental humidity changes. ■... Repellent composition 2... Housing 3... Suspension member.

Claims (4)

[Claims] (1) A mite repellent for use in agricultural greenhouses, which has a repellent composition in which natural or synthetic mint oil is adsorbed on a silica gel carrier and is shaped so that it can be moored or sprayed in agricultural greenhouses. (2) The mite repellent for use in agricultural greenhouses according to claim 1, wherein the surface of the repellent composition is coated with fine styrene resin powder. (3) A repellent composition in which natural or synthetic mint oil is adsorbed onto a finely powdered silica gel carrier is mixed with styrene resin powder, glue, alcohol solvent, etc., and made into a liquid form that can be sprayed inside agricultural greenhouses. Mite repellent in agricultural greenhouses. (4) A mite repellent device for use in an agricultural greenhouse, wherein the repellent composition according to claim 1 is filled in a housing having a window with a mesh filter and a member that can be moored in the greenhouse or installed on a ridge.