JPH092913A - Aleyrodidae repellent - Google Patents

Abstract

PURPOSE: To obtain an Aleyrodidae repellent parasitic to agricultural, horticultural and technological crops, containing, as active ingredient, a specific natural product harmless to humans and livestock and known as e.g. a flavoring matter. CONSTITUTION: This Aleyrodidae repellent contains, as active ingredient, a natural Laurus nobilis oil obtained by industrial steam distillation of dried branches and leaves picked from Laurus nobilis trees. As the Laurus nobilis oil contains cineole, eugenol, etc., oils other than the Laurus nobilis oil (e.g. clove oil) can also be used provided that these contain the above ingredients. The Laurus nobilis oil, in a state of being left intact, is oily and hard to be applied; therefore, the oil is pref. used in the form of (aqueous) solution. The solvent to be used for this purpose is pref. ethanol or methanol used in food additives or food processing. The concentration of the solution is pref. 1-70wt.%. In general, when this repellent is to be used, it is diluted with water and applied; in this case, its dilution is pref. so as to be 0.1-5.0wt.% or so in the concentration of the Laurus nobilis oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insecticide for whiteflies, and more particularly to an insecticide for whiteflies parasitic on industrial crops, vegetables, flowers, fruit trees and the like.

[0002]

2. Description of the Related Art In the fields of agriculture, horticulture, industrial crops and the like, the control of pests has hitherto depended on chemical pesticides. However, the use of chemical pesticides has been reviewed and restricted for some due to environmental pollution and effects on living organisms. Also,
On the other hand, some pests have become resistant to chemical pesticides. Therefore, research on extermination of these pests by natural enemies is also being conducted. Furthermore, the utilization of natural products that are harmless to humans and animals has been required as a measure against environmental pollution. By the way, laurel oil, laurel oil, clove oil, etc. existing in the leaves and bark of laurels have been conventionally used as a flavoring agent for cooking, confectionery, beverages, etc., but their use as pesticides has not been known.

[0003]

[Means for Solving the Problems] The present inventor occurs in greenhouse-grown vegetables, fruit vegetables, tobacco, yacon, tea, etc., such as whitefly, whitefly, which are persistently generated in greenhouses and sometimes in open fields throughout the year. For the control of whiteflies, we examined the use of natural products without using the chemically synthesized pesticides used up to now. As a result, natural laurel oil obtained by industrially steam-distilling the plucked leaves of laurel can be used as a whitefly insecticide and this component can be dissolved in food additives or solvents used for food processing. , Or by improving the solubility with a surfactant, and further diluting it to a predetermined concentration with water and spraying it on whiteflies, the present invention has been found to have a remarkable controlling effect against both adults and larvae. Was completed.

That is, the present invention provides a whitefly repellent containing laurel oil as an active ingredient.

As described above, the whitefly control agent of the present invention contains bay oil as an active ingredient.
This laurel oil contains cineol, eugenol and so on. Therefore, as long as it contains these components, other than laurel oil can be used in the present invention, such as laurel oil and clove oil.

An example of a method for producing a whitefly pesticide containing laurel oil as an active ingredient is shown below. As the material of the present invention, for example, the material obtained as follows is used. The branches and leaves of the planted laurel are dried and crushed, packed into a column of a commercially available steam distillation device (for example, a device manufactured by Maekawa Seisakusho Co., Ltd.), and steam generated using a boiler is ejected from the bottom of this column. Then, the water vapor evaporated there is further guided through a pipe into the cooling water tank and collected. The collected liquid is a mixture of water and laurel oil, and this can also be used, but it is preferable to leave it standing to partition water and tree oil, and to filter to obtain only tree oil.

Laurel oil is oily as it is and is difficult to be sprayed. Therefore, it is preferable to dissolve it in a suitable solvent and, if desired, dilute it appropriately with water before use. When katsura or clove is used as a raw material, cinnamon leaf oil or clove oil can be produced in the same manner as in the case of laurel. The solvent used in the present invention uniformly dissolves laurel oil,
In addition, it is sufficient if it does not damage the agricultural products to be sprayed, but it is desirable that it is harmless to humans and animals and has little or no adverse effect on environmental pollution. From this point of view, particularly ethanol or methanol used for food additives or food processing is preferably used in the present invention. If these alcohols are used at high concentrations, they may damage crops and the like.
%, Preferably 3 to 20%, more preferably 2 to 5%.

The whitefly repellent of the present invention is diluted with water and sprayed before use. Although the dilution rate varies depending on the type of whiteflies, the type of agricultural products, etc., the concentration of laurel oil is 0.
It may be diluted to 1 to 5.0%, preferably 0.1 to 1.0%.

Formulation examples of the whitefly control agent of the present invention thus prepared are shown below. Laurel oil 0.5% Ethanol 3.0% Surfactant Suitable amount Water 96.5%

The whitefly control agent of the present invention is a industrial crop,
Effective against whiteflies that parasitize vegetables, flowers, fruit trees, etc., especially industrial crops such as tobacco, yacon, tea, and greenhouse vegetables such as eggplants, cucumbers, tomatoes. In addition to the above-mentioned whiteflies, whiteflies, etc., It can also be applied to spider mites. Further, the whitefly control agent of the present invention is not limited to whiteflies, but also aphids, spider mites,
It is also effective against tea thrips, thrips which is parasitic on cereals, weevil, Azuki bean weevin, and phytopathogenic fungi.

[0011]

Next, the present invention will be described in detail with reference to examples. Test Example 1 Gardens of about 9 m ² were made on the north and south sides of the research and experiment tower, and yacon was cultivated there. The distance between the two gardens is about 12m, and the garden on the north side is planted with yacon only.
Laurel saplings were planted in the furrows in the southern garden. While the cultivation was continued, white-flying whiteflies occurred in the yacon in the north garden, and the amount increased as the yacon grew and the temperature rose, and it was scattered. However, the whiteflies did not infest Yacon in the southern garden.

Test Example 2 In two compartments where the eggplant seedlings were cultivated (invention zone and control zone) and in another two zones where yacon was cultivated (invention zone and control zone) in a greenhouse of about 40 m ^{2 in} area. In the control area, only eggplant seedlings or yacon were cultivated, and in the present invention area, laurel seedlings were planted in the ridges of eggplant seedlings or yacon. As a result, white-flying whiteflies were generated in the control group and the amount thereof was also increased, but no appearance of parasitic or white-flying whiteflies was observed in the present group.

Example 1 Tobacco in a greenhouse Greenhouse whitefly, which occurred on glutinosa, was placed on a petri dish while being parasitic on tobacco leaves.
It was put in a plastic bag so as not to scatter, and sprayed with a 1% laurel oil solution having the following composition. As a result, the whitefly whitefly (adult) scattered in the bag, but immediately fell or stuck to the inner wall of the bag and died in this state.

Laurel oil 1% Ethanol 3% Surfactant Suitable amount Water 96%

Example 2 Since the white-flying whitefly occurred in the Irrawaddy species, which are closely related to tea, it was placed in a 1 L beaker while being parasitic on the leaves of the Irrawaddy species, and the front and back sides of the leaves on which the Whitefly whitefly (adult) was infested. The laurel oil 0.5% solution or 1% solution prepared in the same manner as in Example 1 was sprayed on and observed. In addition, the same experiment was performed on the whiteflies whitefly, which occurred in tobacco glutinosa. Table 1 shows the results.

[0016]

[Table 1] Table 1 Laurel oil forming insect Remarks (%) (animal) Survival Death ──────────────────────────── ──────── 0.5 225 0 225 Attached to the beaker wall 0.5 323 0 323 Dropped to the bottom of the beaker 1.0 38 0 38 Parasitized by Irrawaddy species 1.0 106 0 106 Tobacco Parasitized by glutinosa

With respect to the larvae and pupae of the whitefly Whitefly, the molting (eclosion) of the adults was observed in a beaker. As a result, it was judged that all of them died without any molting of these adults into adults.

Example 3 Larvae oil 0.1 to 1.0% liquid prepared in the same manner as in Example 1 was placed in a beaker while keeping the white leaves of tobacco whiteflies generated on tea leaves in a greenhouse. Was sprayed. As a result, the adult whitefly of Tobacco, like the adult whiteflies, scattered in the beaker,
Immediately fell or stuck to the inner wall of the beaker and died in this state. In addition, the same experiment was carried out for the whitefly whitefly, which occurred in tobacco glutinosa. Table 2 shows the results.

[0019]

[Table 2] Table 2 Laurel oil adult insect Remarks (%) (animals) Survival Death ─────────────────────────── ──────── 0.1 36 0 36 Parasitizing on tea leaf 0.1 42 0 42 Parasitizing on tea leaf 0.1 41 0 41 Parasitizing on tea leaf 0.5 194 0 194 Tobacco glutinosa parasitic 0. 5 169 0 169 Tobacco Glutinosa parasitic 1.0 1.0 108 0 108 Tobacco Glucinosa parasitic

[0020]

INDUSTRIAL APPLICABILITY According to the present invention, the insect pests of greenhouse vegetables are frequently generated annually, the behavior due to the scattering is also agile, and the insect whiteflies, which are harmful insects to pest control against whiteflies, tobacco, tea, etc. Harmless to humans and animals by natural laurel oil etc. against whiteflies such as
In addition, they can be effectively removed by applying them without adverse effects of environmental pollution.

Claims (2)

[Claims] 1. A whitefly control agent containing laurel oil as an active ingredient. 2. Whiteflies are industrial crops, vegetables, flowers,
The whitefly control agent according to claim 1, which is parasitic on fruit trees and the like.