JPH09301810A - Insecticidal composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an insecticidal composition exhibiting excellent effects against white flies resistant to various kinds of chemical agents by jointly using two kinds of known insecticides in a specific ratio. SOLUTION: This insecticidal composition contains 3-(4-ethoxyphenyl)-3- methyl-6-(4-fluoro-3-phenoxyphenyl)-1-hexyne and 0, 0-dimethyl-0-(3-methyl-4- nitrophenyl)phosphothioate in a weight ratio of 1:3 to 1:20. The composition is applied to insect pests or a place where the insect pests live. The two compounds as the active ingredients are mixed with various kinds of carriers, if necessary further with an additive and subsequently formed into a formulation such as powder, granules, emulsions, etc. The total amount of the active ingredients in the formulation is preferably approximately 0.1-95wt.%. The composition is especially effective for controlling white flies such as Bemisia tabaci and Trialeurodes vaporariorum.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to insecticidal compositions.

2. Description of the Related Art Conventionally, the development of insecticides for controlling whiteflies and the like has been extensively developed, and a wide variety of agents are put to practical use.
However, in recent years, whiteflies in particular have rapidly developed resistance to various drugs, and the effects of various drugs have been significantly reduced, and new insecticides showing excellent effects especially against whiteflies have been desired.

[0002]

In view of such circumstances, the present inventor has conducted various studies to develop an excellent insecticide, and as a result, (a) 3- (4-ethoxyphenyl) -3-methyl- 6- (4-fluoro-3-phenoxyphenyl)-
1-hexyne and (b) O, O-dimethyl-O- (3-
Methyl-4-nitrophenyl) phosphorothioate is used in combination at a weight ratio of 1: 3 to 1:20,
In particular, they have found that they have an excellent insecticidal effect by a synergistic action against whiteflies and the like, and completed the present invention. That is, the present invention provides (a) 3- (4-ethoxyphenyl) -3-methyl-6- (4-fluoro-3-phenoxyphenyl) -1-hexyne (hereinafter referred to as compound a) and (b). ) O, O-Dimethyl-O- (3-methyl-4-nitrophenyl) phosphorothioate (hereinafter, referred to as compound b) as an active ingredient, an insecticidal composition (hereinafter, the composition of the present invention). And a compound b at a weight ratio of 1: 3 to 1:20 are applied to pests or habitats of pests.

[0003]

BEST MODE FOR CARRYING OUT THE INVENTION Compound a is disclosed in JP-A-62-5928.
It is the compound (4) described in Table 1 of the publication, and can be produced by the method described in the publication. Although compound a has a stereo (optical) isomer (R / S) based on an asymmetric carbon atom to which an ethynyl group is bonded, stereoisomers having insecticidal activity and mixtures thereof can be used in the present invention. Compound b can be prepared, for example, by The Pesticide Manual
(Tenth edition; edited by Clive Tomlin; published b
y the British Crop Protection Council and the Roya
l Chemical Society, 1994) p. 435.

The composition of the present invention is a whitefly for Bemisia tabaci (Bemisia).
tabaci), Whitefly (Trialeurodes vapora)
riorum) is especially effective in controlling whiteflies such as
Other pests, such as the beetle stink bug (Eysarcoris)
ventralis), Prickly stink bug (Eysarcoris parvu)
s), Stinkbill, Eysarcoris lewis
i), Green stink bug (Nezara antennata), Southern green stink bug (Nezara viridula), Rapto helicopter bug (Ripto)
rtus clavatus), the stink bug, Cletus punctige
r), stink bugs such as Leptocorisa chinensis, and leafhoppers (Nephotettix cincticep)
s), the brown planthopper (Nilaparvata lugens), the brown planthopper (Laodelphax striatellus), and the white-bellied planthopper (Sogatel)
Hemiptera pests such as la furcifera; Cnaphal
ocrocis medinalis), Nikameichu (Chilo suppressa
lis), lepidopteran pests such as beetles (Parnara guttata); rice weevil (Lissorhoptrus oryzophilus),
Coleoptera insect pests such as rice weevil (Echinocnemus squameus) and rice duck beetle (Oulema oryzae);
It is also effective for the control of orthoptera pests such as xya yezoensis).

In the present invention, the compound a and the compound b used as the active ingredients may be used as they are without adding any other ingredients, but usually, both active ingredients are solid carrier, liquid carrier, gas. Powders, granules, emulsions, by mixing with various carriers such as a granular carrier, and if necessary, adding a surfactant, a dispersant, a sticking agent, a stabilizer, a propellant, and other formulation auxiliary agents as additives. Formulations such as oils, wettable powders, wettable granules, water-soluble film packaging preparations, sols, flowable agents, aerosols, coating agents, fumigants, fumigants, ULV agents, etc. Or dilute with
Alternatively, each active ingredient is formulated in advance in various formulation forms as described above and then mixed or used simultaneously without mixing, or each active ingredient is formulated in advance in various formulation forms as described above and further mixed with water. It is also possible to dilute with and prepare each drug solution, and then mix or mix and use them simultaneously. The total amount of active ingredients in these preparations is usually 0.1 to 95% by weight. Examples of solid carriers used in the preparation include clays (kaolin clay, diatomaceous earth, synthetic hydrous silicon oxide, bentonite, fubasami clay, acid clay, etc.), talc, ceramics, and other inorganic minerals (sericite, quartz, sulfur). , Activated carbon, calcium carbonate, hydrated silica, etc., chemical fertilizers (ammonium sulfate, phosphorus ammonium,
Examples of the liquid carrier include water, alcohols (methanol, ethanol, etc.), ketones (acetone, acetone, etc.).
Methyl ethyl ketone, etc.), aromatic hydrocarbons (benzene, toluene, xylene, ethylbenzene, methylnaphthalene, etc.), aliphatic hydrocarbons (hexane, cyclohexane, kerosene, light oil, etc.), esters (ethyl acetate, butyl acetate, etc.), Nitriles (acetonitrile, isobutyronitrile, etc.), ethers (diisopropyl ether,
Dioxane), acid amides (N, N-dimethylformamide, N, N-dimethylacetamide, etc.), halogenated hydrocarbons (dichloromethane, trichloroethane, carbon tetrachloride, etc.), dimethyl sulfoxide, soybean oil, vegetable oil such as cottonseed oil Examples of the gaseous carrier, that is, the propellant include CFC gas, butane gas, and LPG.
(Liquefied petroleum gas), dimethyl ether, carbon dioxide gas and the like. Examples of the surfactant include alkyl sulfates, alkyl sulfonates, alkyl aryl sulfonates, alkyl aryl ethers and polyoxyethylenates thereof, polyethylene glycol ethers, polyhydric alcohol esters, sugar alcohol derivatives and the like. can give. Examples of pharmaceutical auxiliaries such as fixatives and dispersants include casein, gelatin, polysaccharides (starch, gum arabic, cellulose derivatives, alginic acid, etc.), lignin derivatives, bentonite, sugars, synthetic water-soluble polymers (polyvinyl alcohol). , Polyvinyl pyrrolidone, polyacrylic acids, etc.), and examples of the stabilizer include PAP (acidic isopropyl phosphate), BH
T (2,6-di-tert-butyl-4-methylphenol), BHA (mixture of 2-tert-butyl-4-methoxyphenol and 3-tert-butyl-4-methoxyphenol), vegetable oil, mineral oil , A surfactant, a fatty acid or an ester thereof, and the like.

The thus obtained preparation is used as it is or after diluted with water or the like. Also other pesticides,
They can be used together with or without mixing with nematicides, acaricides, fungicides, herbicides, plant growth regulators, synergists, fertilizers, soil conditioners, animal feeds and the like. The composition of the present invention is usually a pest or a fruit tree, a vegetable, a cotton, a plant, a place where a pest such as an agricultural and horticultural crop such as a tree or a tree inhabits, directly,
Alternatively, it can be applied by a method such as spraying, spraying, fumigation using a device. In the present invention, the amount of the active ingredient applied is, in terms of the total amount of the active ingredient per 10 ares, usually about 0.1 g to about 1000 g, preferably about 1 g to about 500 g. When emulsions, wettable powders, flowable agents, etc. are diluted with water, the application concentration is usually about 3 ppm.
It is about 3,000 ppm, and powders, aerosols, ULVs, etc. are usually applied as they are without any dilution.
These application rates and application concentrations are all in the form of formulation,
It can be increased or decreased without depending on the above range, depending on the conditions such as application time, application place, application method, type of target pest, and degree of damage.

[0007]

EXAMPLES The present invention will be described in more detail below with reference to formulation examples and test examples, but the present invention is not limited to these examples. All the compounds a are racemic (R
(S-form), all parts in formulation examples are parts by weight. Formulation Example 1 Dust: 0.2 part of compound a, 2 parts of compound b, 2 parts of synthetic hydrous silicon oxide, 45.8 parts of talc and 50 parts of clay are uniformly mixed to obtain a powder. Formulation Example 2 Emulsion 10 parts of compound a, 50 parts of compound b, 9 parts of polyoxyethylene alkylaryl ether, 1 part of alkylaryl sulfonate and 1 part of xylene are uniformly stirred and mixed to obtain an emulsion. Formulation Example 3 Wettable powder 10 parts of compound a, 40 parts of compound b, 35 parts of synthetic hydrous silicon oxide, sodium alkylbenzenesulfonate 3
Parts, 2 parts sodium lignin sulfonate and 1 diatomaceous earth
After uniformly mixing 0 parts with a juice mixer, it is pulverized with an air mill to obtain a wettable powder. Formulation Example 4 Flowable agent Polyvinyl alcohol (4 parts) was added to water (41 parts) to uniformly dissolve it, and compound (5 parts) and compound (b) (20 parts) were added thereto, and the mixture was thoroughly stirred with a homogenizer, and then 0.2 part of zansan gum was added. And 0.4 parts of smectite minerals in water 2
A uniformly dissolved and dispersed liquid is added to 9.4 parts to obtain a flowable agent.

Next, according to the present invention, compound a and compound b
It is shown by a test example that an excellent insecticidal effect can be obtained by a synergistic effect, as compared with the case where each of these is used alone.

Test Example 1 Compound a (10% active ingredient amount) formulated as an emulsion and compound b formulated as an emulsion according to Formulation Example 2
Each of (Sumition Chemical Co., Ltd., Sumithion 50% emulsion) was diluted with water, and the diluted solution was mixed so as to have a predetermined active ingredient concentration to obtain a reagent. Each of the compound a prepared as an emulsion and the compound b prepared as an emulsion was used as a comparative control drug. To the cabbage (three leaves stage) planted in a polyethylene cup, 30 ml per cup of the above reagent was sprayed. After air-drying, cut the leaves and put 1 on a plastic petri dish (9 cm in diameter, 2 cm in depth).
About 50 head whitefly adults were released per petri dish (1 group, 3 repetitions). 2 petri dishes
It was kept in a laboratory at 5 ° C., and after 2 days, life and death was examined and the insecticidal rate was calculated. Table 1 shows the results.

[Table 1]

Test Example 2 The powder obtained in Formulation Example 1 was used as a reagent.
Compound a prepared as a powder according to Formulation Example 1
(Active ingredient amount 0.2%) and compound b formulated as a powder (Hokuko Kagaku Kogyo Co., Ltd. Sumithion powder 20:
Each of the active ingredients (2%) was used as a comparative control drug. Covered with nylon ghost to prevent escape 1 /
Ten rice planthoppers (5 males and 5 females) were released per pot in rice planted with a Wagner pot of 10,000 are and laid for 3 days. After that, the adults were removed, and the reagent mixture was sprayed using a bell jar duster (dusting machine) in an amount corresponding to 3 kg of dust / 10 ares (1 group, 3 repetitions). Three weeks after the treatment, the number of surviving larvae of the next generation was investigated and the suppression rate was calculated. The results are shown in Table 2.

[Table 2]

Claims (2)

[Claims] 1. (a) 3- (4-ethoxyphenyl)-
3-Methyl-6- (4-fluoro-3-phenoxyphenyl) -1-hexyne and (b) O, O-dimethyl-O
An insecticidal composition comprising-(3-methyl-4-nitrophenyl) phosphorothioate as an active ingredient in a weight ratio of 1: 3 to 1:20. 2. (a) 3- (4-ethoxyphenyl)-
3-Methyl-6- (4-fluoro-3-phenoxyphenyl) -1-hexyne and (b) O, O-dimethyl-O
An insecticidal method, which comprises treating pests or habitats of pests with-(3-methyl-4-nitrophenyl) phosphorothioate at a weight ratio of 1: 3 to 1:20.