JPH0240641B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for controlling whiteflies and thrips that is effective for controlling pests such as vegetable crops and fruit trees, such as whiteflies and thrips. More specifically, water-soluble salts of polydithiocarbamic acid and water-soluble salts of monodithiocarbamic acid are used to control pests of vegetables, fruit trees, etc., whiteflies and thrips, such as whitefly and thrips. The present invention relates to a method for controlling whiteflies and thrips, which comprises applying as an active ingredient a precipitated product obtained by metathesis with a metal salt. In recent years, in Japan, vegetables and the like have been severely damaged by whiteflies, such as the Japanese whitefly. These pests prefer cucumbers, tomatoes, eggplants, etc., and live heavily on the undersides of leaves, sucking the sap and attacking the leaves. In addition, in order to cause sooty mildew to concomitantly occur, staining the leaves and fruits with sooty mildew and reducing the quality of the product, for example, a great deal of labor and time is required to wipe the fruit before shipping. In addition, it has been confirmed that viruses are transmitted by these pests, especially in cucumbers, and this has become a serious problem. Similarly, in recent years, mandarin oranges, green onions, etc., have been severely damaged by thrips, such as the Chinese thrips. These pests occur, for example, in tangerines from after flowering to when the fruits are enlarged, and they cause damage by causing absorption marks on young fruits and deteriorating the quality of the fruits. As a result of various studies aimed at controlling the damage caused by whiteflies and thrips, the present inventors have found that the drug of the present invention has extremely excellent effects and has completed the present invention. The drug of the present invention is a product obtained by metathesis of a mixed aqueous solution of a water-soluble salt of dimethyldithiocarbamic acid and a water-soluble salt of ethylenebisdithiocarbamic acid with a soluble zinc salt (hereinafter referred to as polycarbamate). It is. When actually applying the agent of the present invention, it is effective to apply it to the parts of the plant where whiteflies and thrips have occurred, and it can also be applied in combination with a carrier. form, e.g. powder, flow dust,
It can be used as any of wettable powders, emulsions, powders, granules, oils, flowables, aerosols, etc. The carrier used may be either solid or liquid, and solid carriers include clay, talc, diatomaceous earth, bentonite, kaolin, etc.
Acid clay, vermiculite, etc. are used, and the liquid carrier is, for example, water. The above products can be diluted with water or the like, or can be used without dilution by means of spraying, dusting, coating, etc. In addition to the active ingredient of the present invention, other insecticidal ingredients, soil conditioners, fungicidal ingredients, synergistic agents, fertilizer ingredients, etc. can also be applied simultaneously. The effects of the present invention will be specifically explained below using test examples. Test Example 1 An on-site whitefly control test was conducted using tomatoes (variety: Kasai Fukuju) grown in a vinyl greenhouse. Spraying was carried out using a small mobile jet three times in total on January 17th, February 3rd, and February 10th, and the survey was conducted two days after each. The survey counted the total number of live larvae and live larvae.

[Table] Test Example 2 An on-site whitefly control test was conducted using chrysanthemums (variety: Shintoa) that were being cultivated in a greenhouse. Spraying was carried out on January 27th using a small sprayer to thoroughly wet the front and back of the leaves. The survey was conducted 3 days after spraying.
On the 10th and 20th, the total number of live larvae and live larvae were counted.

[Table] Test Example 3 A tea thrips control test was conducted in a citrus field (variety: Miyagawa Wase Unshu, 15 years old). Spraying was carried out using a power sprayer a total of four times on July 20th, August 1st, August 25th, and September 12th, and once on October 15th.
We investigated the degree of damage to the nuchal part of 30 fruits per tree.

[Table] * Damage concentration was calculated using the following formula.
Light (%) × 1 + Medium (%) × 3 + Heavy (%)
×5
Damage level =

Claims (1)

[Claims] 1. As a component for controlling whiteflies and thrips, a composition obtained by double decomposing a water-soluble salt of ethylene bisdithiocarbamic acid and a water-soluble salt of dimethyldithiocarbamic acid with a water-soluble zinc salt was used as a component for controlling whiteflies and thrips. A method for controlling whiteflies and thrips, characterized in that the method is applied to a plant body part that has been infected.