JPS5822123B2 - insecticidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides (2-isopropyl-4-methylpyrimidyl-
6)-diethylthiophosphate (hereinafter referred to as "diazinon").

) and 2-chloro-1-(2,4-dichlorophenyl)vinyldimethylphosphate (hereinafter referred to as "dimethylvinphos")
Seven.

) 7 as an active ingredient.

In recent years, agricultural and horticultural crops have been frequently damaged by pests.

The main pests of cabbage and Chinese cabbage are the diamondback moth, the calendula moth of apples, and the corn borer moth of rice. All of these pests repeat several generations a year, and each larva feeds on the leaves of the parasitic crops for a long period of time, so when the damage is severe, Crop growth may be delayed and the quality of the harvest may be significantly reduced.

Recently, as a result of repeated leaf spraying, strains with reduced susceptibility to various chemicals have appeared, making control even more difficult, which has become a major problem in terms of pest control technology and farm management.

In the past, it has shown remarkable fast-acting insecticidal efficacy and long-term sustainable insecticidal efficacy against pests of agricultural crops, reducing the number of times and dosage of chemical spraying, and being highly safe for humans and animals, and reducing environmental pollution. There is a strong desire for the emergence of pesticides with less oxidation.

Both diazinon and dimethylvinphos contained in the insecticidal composition of the present invention are known insecticides, and diazinon is widely used for pest control on all kinds of agricultural crops such as paddy rice, fruit trees, and canola. Similarly, dimethylvinphos is used against lepidopteran pests in fields such as paddy rice, cane rape, and tea, but it lacks quick-acting insecticidal efficacy. When each drug was used alone, sufficient effects were not shown.

The present inventors have discovered that a composition containing diazinon and dimethyl vinphos as active ingredients has a reliable control effect on agricultural and horticultural pests, and as a result of further research based on this, they have developed this invention. completed.

The insecticidal composition of the present invention, which is a mixture of two types of active ingredients with different properties, has a surprising control effect in terms of sustained insecticidal efficacy and immediate insecticidal efficacy that cannot be estimated from the efficacy of each single agent. Not only will the weak points of each single agent be strengthened, but the characteristic properties of the single agents will work synergistically rather than simply as additives.

As a result, the number of times the chemical is sprayed can be reduced due to the increased continuous insecticidal efficacy, and the amount of spraying can be reduced to the level of the amount normally sprayed with each single agent, improving the safety of Sumiyoshi people and livestock when spraying the chemical. increase,
Environmental pollution can be reduced.

When using the above composition of the present invention as an insecticidal composition,
Depending on the purpose of use, it can be used directly by diluting it with water, or it can be used as an emulsion, irrigation agent, dust, powder, flowable agent, etc. using a method commonly used in the field of agricultural chemical manufacturing, using an agricultural chemical auxiliary. It can be used in the form of a highly concentrated micro-spraying agent.

In actual use, these various formulations can be used directly or diluted with water to a desired concentration.

The agrochemical auxiliaries mentioned here 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, toluene,
Examples include aromatic hydrocarbons such as xylene, alcohols such as methylnaphthalene, cyclohexane, methanol, butanol, and glycol, amides such as acetone and dimethylformamide, sulfoxides such as dimethyl sulfoxide, animal and vegetable oils, fatty acids, and fatty acid esters.

Examples of the carrier (diluent) include clay, kaolin, talc, diatom, silica, calcium carbonate, montmorillonite, bentonite, feldspar, quartz, and alumina.

Examples of surfactants include anionic surfactants, cationic surfactants, and nonionic surfactants such as higher alcohol triwam sulfate, stearyltrimethylammonium chloride, polyoxyethylene alkylphenyl ether, and lauryl betaine. Examples include surfactants and zwitterionic surfactants.

In addition, organic raw materials other than carriers commonly used in agricultural chemicals, such as spreading agents, emulsifiers, humectants, dispersants, fixing agents, and disintegrants, can be appropriately mixed as necessary to ensure the effectiveness. .

The insecticidal composition of the present invention may contain a mixture of diazinon and dimethyl vinphos in a concentration range of 0.5 to 95% (by weight), preferably 2 to 85% (by weight). can.

The mixing ratio of diazinon and dimethylvinphos is 0.2 to 1 part by weight of diazinon.
A range of 5.0 parts by weight is preferred.

The amount of the composition of the present invention to be used varies depending on the dosage form, method of application, and other conditions, but is usually about 10 to 1,000 grams per active ingredient, preferably 30 to 500 grams.
is used.

Tasaba powder, granules, etc. contain 40 active ingredients per 10 ares.
~121. In addition, emulsions, irrigation agents, etc. have an active ingredient of 40 to 25
It is in the range of 0g.

However, in special cases it is possible, and sometimes even necessary, to go above or below these ranges.

All formulations can not only be used alone, but also mixed with fungicides, herbicides, plant growth regulators, acaricides, agricultural and horticultural fungicides, soil fungicides, soil conditioners, or nematicides. It may also be mixed with fertilizers and other pesticides.

Next, formulation examples of the present invention will be explained in more detail.
The types and mixing ratios of additives are not limited to these, and can be used in a wide range.

Note that "parts" means "parts by weight." Formulation Example 1 Add and dissolve 45 parts of a mixture of xylene and methylnafculene (1:1) to 20 parts of emulsion diazinon and 20 parts of dimethylvinphos, and to this add a mixture of alkylphenol oxide ethylene condensate and calcium alkylbenzenesulfonate (8 parts).
:2) Mix and dissolve 15 parts and pour into an emulsion.

The main rule is to dilute it with water to the desired concentration and use it as a spray solution.

Formulation Example 2 20 parts of diazinon, 20 parts of dimethyl vinphos, 30 parts of kaolin, 15 parts of clay, and ±10 parts of diatom were mixed,
Further, 5 parts of a mixture (1:1) of sodium lavalate and sodium dinaphthyl methanesulfonate was added and pulverized to obtain a powder.

The basic rule is to dilute it with water to the desired concentration, pour it into a wettable powder, and use it as a spray solution.

Formulation Example 3 1 part of polyethylene glycol 400 was added to 2 parts of powder diazinon and 2 parts of dimethylvinphos, and 93 parts of a mixture of talc and calcium carbonate (1:1) was mixed and pulverized.After sufficiently evenly dispersing and blending, Add 2 parts of silicic anhydride, mix and pulverize to form a powder.

The main rule is to scatter and use as is.

Formulation Example 4 After mixing 3 parts of guiazinon granules and 2 parts of dimethyl vinphos with 47 parts of fine bentonite powder, 46 parts of talc, and 2 parts of IJ worm, water is added and kneaded until uniform.

Next, it is extruded through an injection molding machine, granulated, and passed through a sieve, a dryer, and a sieve to form granules with a particle size of 0.6 to 1 mvt.

The main rule is to use it by directly scattering it on the paddy field and soil surface.

Next, as representative examples of the effects of the present invention, experimental examples will be shown on the diamondback moth, the goldenrod moth, the brown borer moth, etc.; however, the present invention is not limited to these;
Lepidoptera such as Spodoptera japonica and Japanese snail, Hemiptera such as green peach aphid, Japanese radish aphid, orange black aphid, black leafhopper, and brown moth,
It is also applicable to various pests of the order Coleoptera, such as the Japanese ladybug, the yellow beetle, and the yellow flea beetle.

As described below, as is clear from various experimental examples, the insecticidal composition of the present invention exhibits superior direct insecticidal effect (immediate effect) and sustained insecticidal effect (residual effect) compared to each single agent, and also It has also shown excellent protective effects in field tests.

Experimental example 1 Kona larvae killing test (indoor) Cabbage (species:
When there are 5 to 6 leaves on the tree, put it on a turntable (16r, p, m-') and use a compressor spray gun (1kg/C111) from a distance of 1m to dilute the chemical solution with tap water to a specified concentration. was sufficiently sprayed from diagonally upward.

After air-drying, the cabbage leaves were cut and placed in a 1250 m ice cup, and each leaf was inoculated with 10 methomil-resistant diamondback moth final instar larvae from Omiya City, Saitama Prefecture, which had been reared for generations, and the number of live and dead insects was investigated after 24 hours.

The test formulation used was an emulsion. The single agent and the mixture were each tested at five dilution levels, and the test was repeated four times.

The obtained mortality rate was plotted on logarithmic probability paper to determine the LC-50 value (50% "lethal concentration").

The results are shown in Table 1.

Experiment 1 Example 2 Insect killing test (indoor) The parasitic leaves of the Calendula moth larvae collected from an apple orchard in Numata City, Gunma Prefecture and reared on seedlings of the Delicious cultivar were cut and diluted to a specified concentration with tap water. The sample was immersed in water for 10 seconds, air-dried, and then placed in a 2507711 ice cream cup and allowed to stand still.

The test formulation is an irrigation agent, and the dilution concentration is 5 concentrations and 1 concentration is 20.
The number of live and dead insects was investigated on the second day after the trial treatment of ~30 larvae.

The residual effect test was carried out by spraying the same chemical solution on a potted variety Delicious using a hand sprayer, cutting off the leaves 7 days after treatment, and
Ten adult goldenrod moths were inoculated per leaf, and the number of live and dead insects was examined two days later.

The test was conducted in two consecutive sessions with 10 animals per ward.

The obtained mortality rate was recorded on log probability paper, and the LC-50
I asked for

The results are shown in Table 2.

Experimental Example 3 Calendar moth control test (field) Calendar moth field tests were conducted at two locations: Numatafu, Gunma Prefecture, and Suzaka City, Nagano Prefecture.

After investigating the number of parasitic moths on all apple leaves of pre-marked branches using apple trees of variety Fuji 20 to 30 years old, spraying was applied to 301/1 trees using a power sprayer, and after 7 days, all parasitism was detected in the same way. We investigated the numbers.

It was carried out in three consecutive sessions with one tree in each ward. The test formulation used an irrigation agent.

The results are shown in Table 3.

Experimental Example 4 Kobutsumei Mochi control test (field) A Kobutsumei moth field test was conducted in Ageo City, Saitama Prefecture.One section of a paddy field growing rice variety Saitama Mochi No. 10 was 6 x 8 mm in size.
3 ky/10 a of each powder was spread using a manual duster.

Fourteen days after the spraying, leaves damaged by the kobu borer moth among the 50 plants in one area were investigated.

It was carried out in two consecutive districts.

The results are shown in Table 4.

Claims (1)

[Claims] 1 (2-inpropyl-4-methylpyrimidyl-6
)-diethylthiophosphate and 2-chloro-1-(2
, 4-cy'70 ruphenyl) vinyl dimethyl phosphate as active ingredients.