JP2001158711A - Insect pest repellent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an insect pest repellant which is a chemical product capable of suppressing the growth of various insect pests and cultivating organic field crops without using agrochemicals having toxicity. SOLUTION: This insect pest repellent is obtained by diluting a stock solution prepared by fermenting a stevia extract liquid extracted from a plant tissue of the stevia, preferably a boiled extract liquid to a lower ratio than a conventional does. The resultant insect pest repellent is capable of removing the insect pests of the field crops, exterminating and preventing usual insect pests by spraying thereof on leaf surfaces of the field crops. Furthermore, the insect pest repellent is formulated with other insect repellent substances derived from natural products such as pyroligneous acid, a garlic extract liquid, a red pepper extract liquid, a potato extract liquid, cow's milk, a Japanese cypress extract or a white-cedar leaf extract.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a chemical product,
The present invention relates to a pest repellent which can control and prevent pests and general pests of agricultural crops by spraying once or twice using a nontoxic natural product unlike so-called pesticides.

[0002]

2. Description of the Related Art Conventionally, in order to improve the yield of agricultural crops, detailed management such as soil improvement, deep cultivation, weeding, and fertilization has been performed. . Therefore, farmers are susceptible to crop damage,
As soon as they find a disease-sensitive and subtle lesion, they spray the insecticide on the crop to protect the crop from pest damage.

[0003]

However, for the purpose of multi-harvesting and consumer preference, pesticides that promote the generation of pests as a result of cultivation of frail quality from the beginning, dense planting, and extensive use of fertilizers. Use of pesticides tended to increase. Excessively used pesticides migrate to crops and accumulate in the human body, causing hypersensitivity such as allergies, and have a serious impact on health. Attempts have been made to stop or reduce the use of pesticides in order to prevent these damages, but it is not possible to completely eliminate the use of pesticides because it is not possible to overlook the troublesome crops being destroyed by pests. Only efforts are being made to reduce usage. In addition, even if the use of pesticides is stopped, a large amount of pesticides or their decomposed products remains in the soil, so that the effectiveness has not been improved unless pesticide-free or low-pesticide cultivation is continued.

In recent years, efforts have been made to reduce the use of pesticides by deep cultivation, land improvement that emphasizes organic fertilizers, and the like, in order to further enhance the repellent action of pests, which is a kind of self-defense mechanism inherent in plants. Despite the practice, pesticide-free and low-pesticide farming methods are laborious and have not been widely used.

[0005]

An object of the present invention is to solve the above-mentioned problems, and the composition of the present invention is a stock solution obtained by fermenting a stevia extract, preferably a boiled extract, extracted from a plant tissue of stevia. Is characterized by removing the pests of the crop by diluting it to a higher concentration than the conventional amount and spraying it on the leaf surface of the crop, further comprising wood vinegar, garlic extract, karagarashi extract, potato extract, milk And other pest repellents derived from natural products, such as Japanese cypress extract, Japanese cypress extract and Japanese cypress extract.

[0006] That is, the present invention has attempted to increase the yield and sweetness by diluting the extract of Stevia and spraying it on plants, but by reducing the dilution ratio, that is, by spraying it at a high concentration, the pests can be spread. It has been completed by finding the fact that generation of odor is suppressed. That is, in the present invention, unlike the conventional usage, it is important to spray at a high concentration. Furthermore, it has been found that the effect is doubled by adding a substance or an organic acid which has been called another natural pest repellent.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Stevia, which is a raw material of the present invention, is a perennial plant of the family Asteraceae native to South America, Stevia rebaudiana bertoni, and related plants. As a result of the experiment, the active ingredient is contained abundantly in the leaves and stems, especially in the stem before having buds and in the stems of mature plants, but the active ingredient is contained in roots, flowers, and young plants It was confirmed. Stevioside and revadioside, which are known as sweet components of stevia, did not show any pest repellent effect. Therefore, the present invention only needs to contain an extract of the whole plant tissue of Stevia. The extraction method is not particularly limited, as long as the active ingredient contained in the plant tissue of Stevia can be eluted. Boiling extraction, hot water extraction, cold water extraction, or an extraction solution with a lower alcohol or the like can also be used, but boiling extraction is efficient. is there.

For extraction, only the leaves are picked or the aerial part of the plant is cut off, dried and finely pulverized. Since the stem is hard, it is cut before pulverization. Generally, the roots will not be used to germinate next spring. In order to facilitate the elution of the active ingredient, it is preferable to carry out fine pulverization. The extraction is boiled with hot water for 30 minutes or more. In some cases, when the residue obtained by separating the extraction water obtained in the first extraction step is put into new hot water for extraction and re-extracted, the active ingredient is almost completely extracted.

The stevia extract is concentrated to a solid concentration of 6 to
Used as a 20 W / V% extraction stock solution. Generally, 1 to 5 liters of an undiluted extract solution is obtained from 1 kg of finely ground stevia. This undiluted extract is fermented when left at room temperature, and is therefore stored in a container capable of intermittently releasing carbon dioxide gas. The fermentation is carried out vigorously in the early stages and gradually slows down after 3 to 4 months, but continues after 2 to 3 years. Generally, the liquid after fermentation for about one year is used.

In the present invention, the Stevia extract fermentation stock solution is used as it is, preferably diluted 20 to 400 times, more preferably 50 to 300 times. Conventional yield increase,
Spray to bring out the sweetness and the original taste of the crop is 700 ~
Since a 1000-fold diluted solution was used, such a dilute solution did not exhibit an effect of repelling pests. The concentration of the stevia extract varies depending on the aging, such as eggs, larvae, and adults, in addition to the type of the pests. Generally, the pests of agricultural crops are thin, and the general pests are dense. There are cases where the number of times of use may be one, and cases where continuous administration of two or three times is preferable, which has an effect equal to or higher than that of a chemical.

[0011] Pests of agricultural crops that can be used to obtain repellent effects are listed below: armyworm, slugs, green and caterpillars, oily insects,
Mites, thrips, sinkies, greenhouse whiteflies, stink bugs, planthoppers, snails and the like can be listed. Table 1 shows an example of pests and crops that actually have a real harm and have been used to obtain an effect. In addition, sanitary pests, unpleasant pests,
General pests such as wood pests are also effective in 1-2 administrations,
Stevia stock solution (solid content 8%)
Table 2 shows an example of the dilution ratio.

[0012]

[Table 1]

[0013]

[Table 2]

When the pest repellent derived from a natural product is mixed with the stevia extract, the effect of the stevia extract is reduced by 10 to 30%.
Can be improved. Pest repellents derived from natural products include, for example, wood vinegar, garlic extract, karagarashi extract, potato extract, milk cypress extract, cypress extract and the like.

Wood vinegar is an aqueous solution obtained by carbonization of wood and contains various useful components other than acetic acid and methanol, and is known to have a repellent effect against pests.
When combined with stevia extract, it is particularly effective for greenhouse whiteflies. As the garlic extract, an alcohol extract is mainly used, and customarily, a shochu extract is used. When used in combination with a stevia extract, the effect is improved. The hot pepper extract is used after extraction with hot water, alcohol or the like. When used in combination with Stevia extract, a remarkable effect is particularly observed on leaf mites and oily insects. Potato extract is effective against most pests,
When used in combination with Stevia extract, it has a remarkable effect on armyworm and oilworm. Milk is used after being diluted about 500 times, and when used in combination with Stevia extract, has a remarkable effect on oily insects, leaf mites and the like. Hinoki extract and Hiba extract can be obtained with a quick effect by blending with Stevia extract. Even if an organic acid is added to the stevia extract, the effect can be improved. Examples of the organic acid include acetic acid, lactic acid, citric acid, tartaric acid, malic acid, succinic acid, and malonic acid.

[0016]

EXAMPLES (1) Production of Stevia Test Solution Stevia seedlings were planted in the spring and the above-ground part was cut off before having buds. After cutting, it was dried and separated into leaves and stems. The leaves are pulverized to 10 μm or less by a pulverizer to produce stevia leaf powder, and the stem is cut to a size of 5 cm.
It was pulverized to 0 μm or less to produce Stevia stem powder. The stevia leaf powder and the stevia stem powder thus obtained were mixed in a ratio of 3: 7
And uniformly mixed to obtain a concentrated raw material of the mixed powder of Stevia.

1 kg of the stevia mixed powder was boiled for 1 hour using 10 liters of water. After cooling, pomace was separated by a squeezer and boiled down for 3 hours to obtain 2.6 l of unripe stevia extract stock solution. When this unripened extract solution was put in a container and allowed to stand at room temperature, fermentation proceeded and it was necessary to intermittently release carbon dioxide gas. The fermentation was carried out vigorously in the early stage and gradually slowed down after 3 to 4 months, but the fermentation continued slightly after 1 year and 2 to 3 years or more. In this example, an aged stevia extract stock solution fermented for one year was used. This stevia extract is about 8.2%
Of the solid content.

(2) Effect of Stevia Extract Diluent Green worms appeared on cabbage two to three days before harvest. Since it is before harvesting, pesticides cannot be used, and a 400-fold diluted solution of the stevia extract fermentation stock solution prepared in (1) was added at 20 per 10 ares.
When sprayed at a rate of 0 liters, the green worms could not be found the next day and could be shipped with confidence. In addition, a 300-fold diluted solution of the undiluted Stevia extract fermentation solution was sprayed at a rate of 200 liters per 10 ares to the second house from one end of a connected house in which five independent houses for strawberry cultivation were continuously connected. . During the cultivation, green worms, oily insects, mites, and thrips occurred in other buildings, but none of the buildings sprayed with stevia extract produced these insect pests. The repellent of the present invention exerted less burden on the plant than the chemical repellent, and the growth after spraying was stable.

[0019]

According to the present invention, when used in agricultural crops, unlike conventional pest control / preventive agents, there is no load on agricultural crops, and it has the same or better effect than conventional chemicals. Can be provided. Furthermore, even when used for general pests, it is completely harmless to the human body and other animals, so it can be used with confidence.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Naohiko Sato 2-32-1 Chofugaoka, Chofu-shi, Tokyo (72) Inventor Kazuhiro Matsuda 1-4-22-301 Olympic Olympics, Miyagino-ku, Sendai, Miyagi Inventor Minoru Sato 1-31-9 Hiyoshidai, Tomiya-cho, Kurokawa-gun, Miyagi F-term (reference) 2B121 AA12 AA16 AA17 CC21 CC33 FA13 FA15 4H011 AC06 BA06 BA07 BB22 BC22 DA13 DD03

Claims (6)

[Claims] 1. A pest repellent obtained by diluting a stock solution obtained by fermenting a stevia extract extracted from a plant tissue of stevia. 2. The pest repellent according to claim 1, wherein the stevia extract is a boiled extract of stevia plant tissue. 3. The stevia extract has a solid content of 6%.
The insect repellent according to claim 1 or 2, wherein the concentration of the stock solution is 20 to 20% or diluted to 500 times or less. 4. The pest repellent according to claim 1, wherein the diluted solution of the stevia extract is used for spraying foliar crops. 5. A pest repellent derived from another natural product is added to a diluted solution of stevia extract.
5. The pest repellent described in any one of items 4 to 4. 6. The pest repellent derived from another natural product is wood vinegar,
6. The pest repellent according to claim 5, wherein the repellent is at least one selected from the group consisting of a garlic extract, a mustard extract, a potato extract, milk, an extract of Japanese cypress, and an extract of Japanese cypress.