JP2798939B2 - Agricultural and horticultural soil treatment insecticides - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to dimethyl (4-ethoxyphenyl) @ 3-
(3-phenoxy-4-fluorophenyl) propyl}
The present invention relates to an agricultural and horticultural soil treatment insecticide containing silane and octachlorodipropyl ether.

[Conventional technology]

In recent years, pests such as scarab beetles, caterpillars, and leaf beetles, or pests such as shibataga, shibao weevil, etc., that is, insects that inhabit the soil environment permanently or temporarily and perform some kind of attack on crops or plants there. Of small animal groups (hereinafter referred to as soil pests)
The problem is increasing on farmland, golf courses and forests all over the country, but these pests are in the soil and their behavior and behavior cannot be observed directly, making it easy to investigate the pest population and damage. However, the ecology has not been sufficiently investigated due to the fact that the breeding period is long and the breeding is difficult, and effective and stable control methods have not yet been established.

Generally, in controlling soil pests, there are two methods, that is, immediately before planting, a pesticide is preliminarily mixed into the ridge in the soil, and a larva that inhabits or emerges is killed by the insect, thereby controlling the insect. Spraying on adult ridges and young larvae that have just hatched and scattered on ridges is a method of controlling carbamate insecticides such as carbosulfan and NAC, or diazinon, Isoxathion, ethyl thiomethone, MPP,
Powders and granules of organophosphate pesticides such as acephate and DEP,
Although bait agents are mainly used, these chemicals lack stability in soil, and their control effect is extremely unstable because they are strongly affected by organic matter and soil in soil. It has become.

Some of them, such as ethyl thiometon, impart plant permeability and migrate from roots to foliage after mixing with soil to exert an insecticidal effect on sucking pests, but they have many problems in terms of chemical damage and crop residues. Conventional nematicides such as EDB, DBCP, methyl bromide, and carbum are also used, but their application is limited to plant-parasitic soil nematodes. It has drawbacks such as toxicity, irritation and limited cropping time.

Recently, application of pyrethroids such as velmethrin and fenvalerate has been attempted, but it has become clear that it generally cannot be used as an effective means due to the problem of soil desorption properties, and there is a strong need for the development of new control components.

[Problems to be solved by the invention]

The present invention overcomes the above-mentioned problems faced by various existing soil treatment insecticides, has excellent stability in soil, and further has an effect on organic matter in soil, soil properties, or weather conditions by improving soil desorption properties. An object of the present invention is to provide a new type of agricultural and horticultural soil treatment insecticide which stably gives a high control effect without being affected and which is safe and does not cause phytotoxicity.

[Means and actions for solving the problems]

The present inventors have conducted intensive studies and found that dimethyl (4
-Ethoxyphenyl) {3- (3-phenoxy-4-fluorophenyl) propyl} silane (hereinafter referred to as compound A) and octachlorodipropyl ether (hereinafter S-421)
) Containing 2: 1 to 1:10, and applied to soil pests, found that the agricultural and horticultural soil treatment insecticide could achieve the intended object of the present invention and completed the present invention. did.

Compound A represented by formula (I) is It is already known as a compound having both high insecticidal and acaricidal activities and low toxicity to humans (Japanese Patent Application Laid-Open No. 61-87687), and has a high insecticidal activity against insects of the order Pteratophyta, aphids, planthoppers and the like. It is considered to be unsuitable for soil treatment insecticides because of its low activity against pests of Orthoptera and its easy adsorption to organic matter in soil. It was what was.

However, the present inventors consider that, in consideration of the ecology of soil pests, etc., it is considered that the basic insecticidal efficacy test alone is not appropriate for the evaluation of the insecticidal components of soil pests, and carried out practical soil treatment tests on various compounds. As a result, it was confirmed that Compound A had excellent stability in soil,
It has been found that it exerts a high control effect on soil pests such as pest beetles and shows different behavior from conventional pyrethroids.

Furthermore, the present inventors have considered that compound A is an expensive insecticide as compared with organophosphorus agents and carbamate agents, and in order to reduce costs, searched for a synergist for pyrethroids aimed at soil treatment insecticides. As a result, Compound A and S-
Combination with 421 is piperonyl butoxide, sinepirin 500, MGK-264, sesamin, sulfoxide, NIA
The present inventors have found that they show a specifically high synergistic effect as compared with other synergists such as -16388, and have completed the present invention.

As a factor of the synergistic effect of S-421, in addition to the contribution of insecticidal efficacy, improvement of soil desorption properties, that is, by adding S-421, adsorption of compound A to humus plants, soil colloid particles and the like in soil is reduced. As a result, decomposition or inactivation of compound A was suppressed.

Conventionally, synergists for pyrethroids such as S-421 have been considered to exert synergistic effects by inhibiting metabolic degradation of active ingredients in insects, and the soil desorption properties disclosed by the present invention The synergistic effect based on the improvement is completely inconceivable from conventional knowledge.

The soil-treated insecticide of the present invention comprises Compound A as an insecticidal component.
Can be contained in an amount of from 0.05 to 80% by weight, and when mixed with S-421, exhibits a high synergistic effect. The mixing ratio of compound A to S-421 is from 2: 1 to 1:10 (preferably from 1: 1 to 1). 1: 5) is appropriate.

If the mixing ratio is out of the above range, the desorption property in soil is not improved, and the control effect becomes very unstable.

The dosage form of the soil treatment insecticide for agricultural and horticultural use of the present invention can be various, such as powders, granules, emulsions, wettable powders, suspending agents, and baits, depending on the nature and purpose of the insecticide.

Any of the preparations can be prepared according to a conventional method, and solid carriers include clays (kaolin, clays, etc.), talcs, and other inorganic minerals (eg, sericite, sulfur powder, activated carbon, calcium carbonate, hydrated silica) ), Fine powders such as fertilizers (eg, ammonium sulfate, ammonium phosphate, ammonium nitrate, urea),
Alternatively, a granular material can be used. For powders,
From the viewpoint of suppressing drift at the time of spraying and preventing environmental pollution, 20% of fine powder of 10 microns or less in the particle size distribution
Those cut below, such as driftless clay (DL clay), are particularly useful.

As the liquid carrier, water, alcohols, aromatic hydrocarbons (eg, toluene, xylene, etc.), aliphatic hydrocarbons (eg, kerosene, kerosene, etc.), esters, nitriles, etc. can be used. Next, examples of the surfactant include alkyl sulfates, alkyl sulfonates, alkyl aryl sulfonates, polyethylene glycol ethers, and polyhydric alcohol esters. In addition, fixing agents and dispersing agents such as casein, gelatin, starch, CMC, and polyvinyl alcohol are appropriately used.

Further, by microencapsulation or cyclodextrin inclusion compound A used in the present invention,
Alternatively, BHT, Sumilizer BP-101 (trade name of Sumitomo Chemical), a vegetable oil, a surfactant, an alkyl phosphate derivative, and a stabilizer such as glycols are added to increase the chemical stability and enhance the residual effect in soil. It is also possible to obtain a formulation which is suitable.

The composition of the present invention may further contain other insecticides, for example, organophosphorus agents such as fenitrothion, isoxathion, MPP, acephate, DEP, diazinon, and ethylthiomethone; carbamates such as carbosurphan, NAC, MTMC, BPMC, and PHC;
Pyrethrin, allethrin, phthalthrine, framethrin, phenothrin, permethrin, fenvalerate,
Conventional pyrethroid insecticides such as fluvalinate and etofenprox, insecticides or acaricides such as cartap, chlorphenamidine and buprofezin, fungicides, nematicides, herbicides, insect growth disrupters, plant growth regulation By mixing a pesticide, fertilizer and other pesticides, a multipurpose composition having an excellent effect can be obtained, and labor saving and a synergistic effect between drugs can be expected.

The agricultural and horticultural soil treatment insecticides of the present invention include sweet potato, taro, tomato, eggplant, pepper, radish, carrot, burdock,
Scarabaeous beetles (such as Dauganebuibu, Himekogane, Akabirodokogane, Kurokogane) that damage vegetables such as cabbage, strawberry, watermelon, squash, melon, corn, and potato; ), Beetle beetle, beetle flea beetle, onion flies, onion flies, gourd weevil, keratoids, mite, dung beetle, tobimushimodoki, rice beetle, cricket, longhorn beetle, beetles, grass beetle, beetle, beetle, beetle, beetle Has a high insecticidal effect against plant parasitic soil nematodes, etc., and provides a high control effect before and after planting and before sowing in the soil mixing treatment or during the growing application.

In addition, the soil treating agent of the present invention is different from the conventional organophosphorus soil treating insecticide in the mechanism of action of the nematicide, and is extremely excellent in terms of safety and prevention of chemical damage.

〔Example〕

Next, the present invention will be described in more detail by way of formulation examples, test examples, and examples, but it is needless to say that the present invention is not limited to these.

Formulation Example 1 Granules Compound A 3 parts, S-421 6 parts, synthetic hydrous silicon oxide 1 part,
2 parts of calcium ligninsulfonate, 30 parts of bentonite and 58 parts of kaolin clay are thoroughly pulverized and mixed, water is added and kneaded well, and the mixture is granulated and dried to obtain granules.

Formulation Example 2 Powder Compound A 0.5 part, S-421 2.0 parts, Stabilizer Sumilizer BP
−101 (Sumitomo Chemical, trade name) 0.05 parts by Nisseki Hisol SAS
-296 (Nippon Petroleum, trade name) was dissolved in 1.0 part, this was adsorbed on 10 parts of calcium carbonate and 2.0 parts of carplex, 0.5 part of Drilles A (Sankyo, trade name) and 83.95 parts of DL clay were well mixed. After mixing, a DL powder is obtained by mixing and pulverizing with a hammer mill.

Formulation Example 3 Emulsion To 5 parts of Compound A and 10 parts of S-421, 5 parts of Solpol SM-200 (Toho Kagaku, trade name), 20 parts of xylene, and 60 parts of white kerosene are added, mixed well, and dissolved to obtain an emulsion. .

Test Example 1 A predetermined dilution of the following formulation emulsion prepared according to Lumber Example 3
20 ml was mixed with 500 g of two types of soil (16 mesh) so that the active ingredient concentration in the soil was 0.5 ppm.
The pieces were placed in a polyethylene cup having a diameter of 15 cm and a height of 10 cm together with five carrots having a thickness of 0.5 cm. One day and two weeks later, ten third-instar larvae of the Anugalacuprea were released, and the number of dead and larvae three days after release was determined. The mortality was determined as follows.

As a result of the test, the combination of Compound A and S-421 showed a specific synergistic effect, while piperonyl butoxide,
Synergists such as Sinepirin 500 and Sesamin had little effect.

When diazinon or permethrin is used instead of compound A as an active ingredient (control insecticides 5 to 8),
Although the synergistic effect of S-421 was not recognized, it is presumed that the mechanism of action of these active ingredients and instability in soil are involved as causes.

Examining the soil properties of the test soils, sandy soils with a low organic matter content generally have better insecticidal activity and, in Andosol soil, had fluorescence that destabilizes the effect. Only the inventive composition in combination showed a high mortality regardless of the soil properties of the soil.

This is because not only the synergistic contribution of the insecticidal efficacy of S-421, but also the addition of S-421 improved the soil desorption properties, reduced the adsorption of compound A to organic matter in the soil and suppressed the inactivation. It is thought to be due to this.

Test Example 2 A soil treatment test was performed according to Test Example 1 using the following formulation emulsion, and the results were as follows.

As a result of the test, a high synergistic effect was observed by compounding S-421 with compound A. However, if the mixing ratio of S-421 was too high (sample No. 7), minus in terms of soil desorption properties. , But the effect was reduced.

Therefore, it became clear that the mixing ratio of compound A and S-421 exhibiting a synergistic effect is appropriately 2: 1 to 1:10 (preferably 1: 1 to 1: 5).

Example 1 1 part of compound A, 3 parts of S-421, 2 parts of diazinon, 1 part of synthetic hydrous silicon oxide, calcium ligninsulfonate 2
, 30 parts of bentonite and 61 parts of kaolin clay were thoroughly pulverized and mixed, water was added and kneaded well, followed by granulation and drying to obtain granules.

5kg per 10a at the location of the original manure in the ridge before cutting the sweet potato
Sprayed and mixed well with soil.

After the ridges were mulled and cultivated with vinyl, the plants were cultivated, and were able to control the infestation of beetles such as Scutellaria chinensis and Scarab beetles, and the soil pests such as Kera and Nekirimushi, and no phytotoxicity was observed.

Example 2 0.5 part of Compound A and 2.0 parts of S-421 were combined with Nisseki Hisol SAS-2.
The mixture was dissolved in 1.0 part of 96 (Nippon Oil Co., Ltd.), 2.0 parts of carplex, 1.0 part of tripropylene glycol and 93.5 parts of DL clay were added, mixed well, and then mixed and ground with a hammer mill to obtain a DL powder.

When soybeans and kidney beans were sown, 3kg per 10a was applied to the seeding holes and mixed well with the soil.

Example 3 10 parts of compound A, 10 parts of S-421, 2 parts of Solpol 2495 (trade name), 2 parts of sun extract P-201 (trade name of Sanyo Kokusaku pulp), 15 parts of white carbon and 61 parts of kaolin clay Was uniformly mixed in a mixer to obtain a wettable powder with an active ingredient of 10%.

When a water dilution of 2000 times this wettable powder is applied to the lawn damaged by rice weevil, the progress of the damage can be completely suppressed, and the problem of phytotoxicity to the lawn and toxicity to nearby aquatic seafood is Not at all.

〔The invention's effect〕

The agricultural and horticultural soil treatment insecticide of the present invention has excellent stability in the soil, further provides a stable and high control effect without being affected by the soil properties and weather conditions of the applied soil, and is safe and prevents phytotoxicity. It is a highly practical formulation because of its excellent properties.

[Brief description of the drawings]

FIG. 1 shows the relationship between the concentration of each component of Compound A and S-421 in Test Example 2 and the mortality in test soil A.
The area above the dotted line indicates the synergistic action region.

────────────────────────────────────────────────── (5) References JP-A-61-87687 (JP, A) JP-A-63-170386 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A01N 55/00 A01N 31/14

Claims (1)

(57) [Claims] 1. Dimethyl (4-ethoxyphenyl) @ 3-
(3-phenoxy-4-fluorophenyl) propyl}
Silane and octachlorodipropyl ether, 2: 1 to 1: 1
An agricultural and horticultural soil treatment insecticide which is contained at a ratio of 0 and is applied to soil pests.