JPS6340405B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to 3'-phenoxy-α-cyanobenzyl-1-(4-ethoxyphenyl)-2,2-dichlorocyclopropanecarboxylate (hereinafter abbreviated as "Compound A") and 2-chloro-1- (2,
4-dichlorophenyl) vinyl dimethyl phosphate (hereinafter abbreviated as "dimethylvinphos"),
0,0-dimethyl-0-(3,5,6-trichloro-2-pyridyl)phosphorothioate (hereinafter referred to as
It is abbreviated as "chlorpyrifosmethyl." )0, 0-
Diethyl-0-(5-phenyl-3-isoxazolyl) phosphorothioate (hereinafter abbreviated as "isoxathion") and 0,0-diethyl-
0-(3-oxo-2-phenyl-2H-pyridazin-6-yl) phosphorothioate (hereinafter referred to as
It is abbreviated as "pyridafentione". ) The present invention relates to an insecticidal composition containing as an active ingredient at least one compound selected from the group consisting of: Today, as a result of repeated spraying of chemicals for the purpose of controlling various pests such as agricultural and horticultural pests, forest pests, and sanitary pests, strains of each pest with reduced chemical sensitivity have appeared in various places, making their control even more difficult. As it has become more common, it has become a major problem in terms of pest control technology and farm management. Therefore, it exhibits remarkable insecticidal efficacy against these insect pests, especially those with reduced drug susceptibility, and reduces the frequency and amount of chemical spraying, and is highly safe for humans and livestock. There is a strong desire for a pest control agent that causes less environmental pollution. As a result of intensive research, the present inventors have found that a composition containing as active ingredients Compound A and at least one compound selected from the group consisting of dimethylvinphos, chlorpyrifos-methyl, isoxathion, and pyridafenethione has been found. It was discovered that the present invention has a reliable control effect on agricultural pests, other forest pests, sanitary pests, etc. Based on this, further research was conducted, and as a result, this invention was completed. The insecticidal composition of the present invention has surprising control effects in terms of insecticidal efficacy, rapid insecticidal efficacy, and sustained insecticidal efficacy that cannot be estimated from the efficacy of each single agent. In other words, the characteristic properties of a single agent are simply It shows a significant synergistic effect rather than an additive effect. As a result, a more reliable pest control effect can be obtained, the number of times the chemical is sprayed can be reduced, and the amount of spraying can be reduced to approximately 1/2 of the amount normally sprayed with each single agent, improving safety when spraying the chemical. It can improve safety for humans and livestock and reduce environmental pollution. The pests to which the composition of the present invention is applied are
In addition to the brown borer moth, the Japanese cockroach, the Japanese cockroach, the black cockroach, the American cockroach, the Culex mosquito, the common mosquito, the Aedes aegypti mosquito, the black weevil, the Japanese black weevil, the white-spotted weevil, the red-spotted weevil, the black leafhopper, the white-legged planthopper, the brown planthopper, the brown planthopper, and the Japanese brown planthopper. , rice leafminer, rice leafminer, rice leafminer, rice leafminer, rice leaf beetle, rice water weevil, rice weevil, diamondback moth,
Spodoptera aphid, Spodoptera aphid, Japanese whitefly, corn borer moth, Japanese bean moth, white-spotted moth, Japanese bean aphid moth, green peach aphid, cotton aphid, false radish aphid, orange black aphid, rose bush aphid, Japanese whitefly, American white flycatcher, gypsy moth, pine kareha, white radish aphid , peach beetle, peach beetle,
It can also be applied to various pests such as the golden leaf moth, the orange leafminer moth, the Chinese yellow thrips, the red leaf beetle, the red leaf beetle, the white leaf moth, and the striped armyworm. When using the above-mentioned composition of the present invention, depending on the purpose of use, it may be diluted directly with water, or it may be made into an emulsion using a method commonly used in the field of agrochemical formulations, using an agrochemical adjuvant. It can be used in the form of preparations such as powders, powders, granules, aerosols, flowables, and high-concentration micro-dispersants. In actual use, these various preparations can be used directly or diluted with water to a desired concentration. The agrochemical auxiliaries mentioned herein include inert solvents and/or carriers (diluents), as well as various surfactants and/or organic raw materials. As a solvent, petroleum fractions such as kerosene and light oil,
Aromatic hydrocarbons such as toluene and xylene, alcohols such as methylnaphthalene, cyclohexane, methanol, butanol, and glycol, acetone,
Examples include amides such as dimethylformamide, sulfoxides such as dimethyl sulfoxide, animal and vegetable oils, fatty acids, fatty acid esters, and the like. As a carrier (diluent), clay, kaolin,
Examples include talc, diatomaceous earth, silica, calcium carbonate, montmorillonite, bentonite, feldspar, quartz, and alumina. Examples of the surfactant include anionic surfactants such as higher alcohol sodium sulfate, stearyltrimethylammonium chloride, polyoxyethylene alkyl phenyl ether, lauryl betaine, cationic surfactants, nonionic surfactants, Examples include zwitterionic surfactants. In addition, auxiliary agents other than carriers normally used for agricultural chemicals, such as spreading agents, emulsifiers, wetting agents, dispersants, fixing agents, disintegrants, etc., can be appropriately mixed as necessary to ensure the insecticidal effect. . In the insecticidal composition of the present invention, the concentration of the mixture of Compound A and each organophosphorus insecticide in the formulation is 0.5 to 95%.
(by weight), preferably in the range of 1.5 to 80% (by weight). The compounding ratio of Compound A and each organophosphorus insecticide is 1.0 to 5.0 parts by weight, preferably 2.0 to 4.0 parts by weight, per 1 part by weight of Compound A. . The amount of the composition of the present invention to be used varies depending on the dosage form, application method, timing, and other conditions, but is usually 10
20-300g of active ingredient per unit, preferably
30-250g is used. For example, powders have an active ingredient of 30 to 120g per 10ares, and granules have an active ingredient of 30 to 120g per 10ares.
120~240g, and emulsions and hydrating agents have active ingredients of 40~
It is in the range of 250g. However, in special cases it is possible, and sometimes even necessary, to exceed or fall below these ranges. All formulations can be used alone or mixed with fungicides, herbicides, plant growth regulators, agricultural and horticultural fungicides, soil fungicides, soil conditioners, nematicides, or acaricides. It can also be mixed with other insecticides in fertilizers. Next, formulation examples of the present invention will be explained in more detail in the following examples, but the types and mixing ratios of additives are not limited to these and can be used in a wide range. Note that "part" means "weight part"
means. Example 1 Emulsion 45 parts of a xylene-methylnaphthalene mixture (1:1) was added and dissolved in 10 parts of Compound A and 30 parts of isoxathion, and then a mixture of alkylphenol oxide ethylene condensate and calcium alkylbenzenesulfonate (8 parts) was added and dissolved. :2) Add 15 parts to make an emulsion. This agent is diluted 1000 to 4000 times with water and used as a spray solution. Example 2 Wettable powder 20 parts of Compound A and 20 parts of chlorpyrifos-methyl are mixed with 52.5 parts of synthetic silicic acid fine powder, and further mixed with 7.5 parts of a mixture of sodium laurate and dinaphthyl sodium methanesulfonate (1:1). Grind to obtain powder. This agent is diluted 1,000 to 4,000 times with water and used as a spray liquid as a hydrating agent. Example 3 Powder 95 parts of a mixture of talc and calcium carbonate (1:1) was added to 1 part of compound A and 2 parts of pyridafenethion, mixed and ground to sufficiently evenly disperse and blend, and then synthetic silicic acid fine powder was added. Add 2 parts and mix and crush to make a powder. This agent can be used as is by spraying. Example 4 Granules 2.5 parts of Compound A and 2.5 parts of dimethylvinphos are mixed with 47 parts of bentonite fine powder, 46 parts of talc, and 2 parts of sodium ligninsulfonate, and then water is added and kneaded until uniform. Next, the mixture is granulated using an injection molding machine, and then passed through a sieve, a dryer, and a sieve to form granules with a particle size of 0.6 to 1.0 mm. This agent is used by directly scattering it on the paddy field and soil surface. As is clear from various experimental examples as described below, the insecticidal composition of the present invention exhibits superior insecticidal efficacy, fast-acting insecticidal efficacy, and sustained insecticidal efficacy compared to each single agent, and also ,
It also shows excellent control effects in field tests. Experimental example 1 Insect killing test on Musashimochi rice plant Five plants of the rice variety Musashimochi were planted in a pot of 1/10000 are. When the plant reached a height of 30 cm, the pot was placed on a turntable and rotated at a speed of 16 rpm. An emulsion or a wettable powder diluted with tap water to a predetermined concentration was sprayed onto the pot at a pressure of 1 kg/cm ³ from a distance of 1 m using a compressor spray gun. One day after spraying,
Collected from Konko Town, Okayama Prefecture 3 and 7 days later,
Fifteen newly hatched larvae of N. japonica, which had been reared for generations, were released into the pot. 3 days later, that is, 4 days after the spraying date (hereinafter referred to as "4 days later"), 6 days later (hereinafter referred to as "6 days later"), and 10 days later (hereinafter referred to as "10 days later").
``Days later.'' ), the rice was disassembled under a stereomicroscope, and the number of dead insects on each day was investigated to determine the mortality rate. The experiment was conducted in the glass greenhouse, in Ward 1, Section 3.
It was carried out in tandem. The results are shown in Table 1.

[Table] Experimental Example 2 Diamondback Moth Insect Killing Test When a cabbage (variety: Shikatori Amanan) transplanted into a 9 cm diameter pot had 7 to 8 true leaves, the pot was placed on a turntable (16 rpm). The chemical solution was sprayed from a distance of 1 m using a compressor spray gun at a pressure of 1 kg/cm ³ to the extent that it dripped. 1 day, 7 days, 14 days and 21 days after spraying, 10 3rd instar larvae of the diamondback moth collected from Omiya City, Saitama Prefecture and reared for generations were released into the pots. 1 day later, i.e. 2 days after the date of spraying
Days later (hereinafter referred to as “two days later”), Eight days later (hereinafter referred to as “two days later”),
It says "8 days later." ), 15 days later (hereinafter referred to as "15 days later") and 22 days later (hereinafter referred to as "22 days later").
The number of surviving insects was investigated. The experiment was conducted in three consecutive sessions in the first section of a glass greenhouse. The results are shown in Table 2.

【table】

[Table] Experimental example 3. Prunus elegans control test (field) A field test of P. elegans was conducted in a cabbage field in Ageo City, Saitama Prefecture. The cabbage field (variety: Shiki Tori Amanran) that was transplanted on September 23rd was divided into ^20m2 sections.
On October 21st, diluted chemical solution 130/10a was sprayed using a power sprayer. 1 regular day (3 days before and after spraying)
After 1 day, 7 days, and 14 days), the number of larvae of the cabbage on 10 plants per plot was investigated. It was carried out in two consecutive districts. The results are shown in Table 3.

[Table] Experimental Example 4 Kobuno borer control test (field) A Kobuno borer moth field test was conducted in a general farmer's paddy field in Izumi City, Kagoshima Prefecture. A paddy field under cultivation of the rice variety Koganemasari (planting date: June 20th) was divided into 125 ^m2 sections.
On August 7th, an amount equivalent to 4 kg/10 a of each powder was spread using a power duster. The application was carried out in two consecutive sessions in one area, and the number of leaves damaged by the larvae of the Knot borer moth per 100 plants was investigated before and 15 days after the application. The results are shown in Table 4. The corrected damage index in the table was calculated using the following formula. Corrected damage index = Number of damaged leaves in untreated area before treatment × Number of damaged leaves in treated area after treatment / Number of damaged leaves in untreated area after treatment × Number of damaged leaves in treated area before treatment × 100

【table】

Claims (1)

[Claims] 1 3'-phenoxy-α-cyanobenzyl-1-
(4-ethoxyphenyl)-2,2-dichlorocyclopropanecarboxylate and 2-chloro-
1-(2,4-dichlorophenyl)vinyl dimethyl phosphate, 0,0-dimethyl-0-(3,
5,6-trichloro-2-pyridyl) phosphorothioate, 0,0-diethyl-0-(5-phenyl-3-isoxazolyl) phosphorothioate and 0,0-diethyl-0-(3-oxo-2-
at least one selected from the group consisting of phenyl-2H-pyridazin-6-yl) phosphorothioate;
An insecticidal composition characterized by containing more than one species of compound as an active ingredient.