JPS63201104A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide a herbicide composition containing one or two kinds of O-3-t- or O-4-t-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate in combination with bromobutide and pyrazoxyfen as active components. CONSTITUTION:The objective herbicide contains (A) O-3-tert-butylphenyl N-(6- methoxy-2-pyridyl)-N-methylthiocarbamate and/or O-4-tert-butylphenyl N-(6- methoxy-2-pyridyl)-N-methylthiocarbamate, (B) bromobutide [N-(alpha,alpha-dimethyl benzyl)-2-bromo-3,3-dimethylbutylamide] and (C) pyrazoxyfen [4-(2,4- dichlorobenzoyl)-1,3-dimethyl-5-phenacyloxypyrazole] as active components. The composition has excellent herbicidal effect and high safety to paddy rice plant and exhibits synergistic effect.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a herbicide composition, and more specifically
t-Butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate or 0-4-te
rt-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate or two, N-(α,α-dimethylbenzyl)-2-bromo 3,3-dimethylbutyramide and The present invention relates to a herbicidal composition with excellent herbicidal effects, characterized by containing 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-phenacyloxypyrazole as an active ingredient.

[Conventional technology]

Although a large number of herbicides for rice cultivation have already been developed, there is still strong market demand for improved performance, safety, and reduction of chemical damage.

In addition, many of the weeds in paddy fields are characterized by their emergence over a long period of time, and the growth conditions of the weeds at the time of herbicide application vary from those that have not yet germinated to those that have grown to some extent. There is usually a mixture of stages. For this reason, it is not possible to obtain a satisfactory herbicide effect by spraying the herbicide only once, and the herbicide must be applied several times.

[Problem that the invention seeks to solve]

The present inventors have developed an excellent product that can almost completely control weeds from pre-germination to weeds that have grown to some extent by simply spraying a low dose of the chemical, maintains its effect for a long time, and is highly safe for paddy rice. As a result of intensive research aimed at developing herbicides, we have found that the herbicide composition of the present invention has an extremely significant synergistic effect that far exceeds expectations by applying each active ingredient in an appropriate proportion. They discovered this and completed the present invention.

[Means for solving problems]

The herbicidal w1 composition of the present invention has an excellent herbicidal effect and is highly safe for paddy rice, and has an excellent synergistic effect that cannot be expected from the herbicidal effects of each active ingredient alone.

That is, the present invention provides 0-3-tart-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate (hereinafter referred to as compound ①) or 0-
4-tart-butylphenyl N-(6-methoxy-
2-pyridyl)-N-methylthiocarbamate (hereinafter referred to as
One or two types of compounds (referred to as compound ■) and N-(α, α
-dimethylbenzyl)-2-promo 3,3-dimethylbutyramide (hereinafter referred to as compound ■) and 4-(
2,4-dichlorobenzoyl)-1,3-dimethyl-5
The present invention provides a herbicidal composition containing -phenacyloxypyrazole (hereinafter referred to as compound (2)) as an active ingredient.

[Effect]

Compound! Alternatively, when compound ■ is used alone as a herbicide for paddy fields, weeds grow in the pre-emergence stage.

It is highly effective against Japanese snails, Japanese snails, and other insects, and is also effective against fireflies, etc. The major feature of this drug is that it has a herbicidal effect on weeds, even those that have grown to a certain extent after germination, and there is no practical harm to transplanted paddy rice. .

However, the herbicidal effect is not sufficient against some perennial weeds, especially during the weed growing season.

On the other hand, Compound M is called bromobutide, and when used alone as a herbicide for paddy fields, it is highly effective against firefly, Japanese cypress, and Japanese grasshopper when treated from before to immediately after the emergence of weeds. It is also effective against grasshoppers, staghorn snails, water snails, etc. Moreover, it is highly safe for paddy rice, and is highly useful as a herbicide for paddy fields. However, once the weeds have grown to a certain extent, the weeding effect becomes weaker, and the weeding effect is particularly insufficient against grasshoppers during the growing season. It is.

In addition, the compound ■, whose name is biradixifen, is used alone as a herbicide for paddy fields, and when treated from before to just after the emergence of weeds, it is highly effective against not only annual weeds but also perennial weeds. It exhibits a herbicidal effect and is also effective against firefly, water snail, etc. Moreover, it is highly safe for paddy rice, and is highly useful as a herbicide for paddy fields.However, once the weeds have grown to a certain extent, the herbicidal effect becomes weaker, and the herbicidal effect cannot be expected, especially against wild grass during the growing season.

The herbicidal composition of the present invention, which is a combination of compound (1) or one or both of compound (2) and compound (m) and compound (2), not only compensates for the shortcomings of each drug, but also exhibits an extremely significant synergistic effect. was completely unexpected.

The blending ratio of each active ingredient in the herbicide composition of the present invention is particularly 1
11@Hana (Excellent synergistic effects can be obtained in a wide range of blending ratios, but preferably Compound ■ is about 0.1 to 10 parts by weight per 1 part by weight of Compound ■ or one or two of Compound ■. Appropriately, about 0.1 to 10 parts by weight of Compound (1) and Compound (2) are used.

When actually using the herbicide composition of the present invention, the compound! Alternatively, one or two of Compound (2), Compound I and Compound (2) may be mixed in appropriate amounts with an inert carrier to form granules, fine granules, wettable powders, emulsions, and powders, which are commonly used forms of agricultural chemicals. It can be used in various forms such as , flowable agents, etc.

Solid carriers include calcium carbonate and apatite.

Gypsum, silica gel, vermiculite, mica.

Diatomaceous earth, talc, pyroferrite, acid clay, clay, kaolinite, montmorillonite.

Examples include mineral powders such as bentonite, white carbon, and pumice powder, vegetable powders such as crystalline cellulose and starch, and polymeric compounds such as polyvinyl chloride and petroleum resins.

Liquid carriers include methanol and ethanol.

Alcohols such as cyclohexanol, amyl alcohol 8 ethylene glycol, aromatic hydrocarbons such as benzene, toluene, xylene, methylnaphthalene, ketones such as isophorone, cyclohexanone, chlorobenzene,
Examples include halogenated hydrocarbons such as trichloroethylene, ethers such as ethyl cellosolve, butyl cellosolve, and dioxane, esters such as isopropyl acetate and benzyl acetate, polar solvents such as dimethylformamide and dimethyl sulfoxide, kerosene, mineral oil, and water. Can be done.

In addition, surfactants and spreading agents may be added if necessary for the formulation.

The reliability of the herbicidal effect can be increased by adding adjuvants used in agricultural chemicals such as binders or stabilizers.

In addition, the herbicide composition of the present invention may optionally contain an insecticide,
It may also contain or be used in combination with fungicides, plant growth regulators, fertilizers, or other herbicides.

The amount of each active ingredient when preparing the herbicide composition of the present invention depends on the application situation, application time, and application method.

Although it varies depending on the target grass species, etc., the amount of active ingredient per are is a compound! Or compound ■ is generally 1-=50
g, preferably 2 to 30 g, Compound (1) is generally 1 to 50 g, preferably 2 to 30 g, and Compound (2) is generally 1 to 50 g, preferably 2 to 30 g. .

In addition, the total amount of active ingredients is generally 5 to 1 per are.
00g, preferably in the range of 10 to 60g.

The content of the total active ingredients in the preparation is suitably in the range of 1 to 90%, preferably 3 to 80% in terms of weight ratio.

〔Example〕

Next, examples of formulations of the herbicide composition of the present invention will be explained.
The present invention is not limited to these. In the examples, "parts" indicate parts by weight.

Example 1 Compound 1 10 parts Compound I11 10 parts Compound IV
Part 15 Keiso±
61 parts Neoperex [Product name: Kao Atlas Co., Ltd.] 2 parts Tsurupol 80
0A [Product name: manufactured by Toho Chemical Industry ■] Two parts of the above components were mixed and ground to obtain a wettable powder.

Example 2 Compound! 3-part compound ■ 2-part compound ■ 5-part compound ■ 7-part Tsurpol 800A 10-part xylene
73 parts The above components were mixed and dissolved to obtain an emulsion.

Example 3 Compound ■ 4-part compound m S-part compound ■
5 parts bentonite 35 parts talc 48 parts Tsurupol 800A 3 parts After mixing and pulverizing the above ingredients, add an appropriate amount of water and knead to obtain a diameter of 0.7 fi.
The mixture was extruded through a sieve hole, dried, and then cut into pieces of 1 to 1 m in length to obtain granules.

Next, the excellent herbicidal effect of the herbicide composition of the present invention will be explained using Examples and Comparative Examples.

Example 4 and Comparative Examples Paddy soil that had been made into a paddy field by adding water was placed in a plastic container with a diameter of 211 cm, seeds of various weeds were sown on the soil surface layer, and the germinated tubers of Cyperus japonica and Urikava were transplanted. 1 paddy rice seedling (variety: Nipponbare) at the two-leaf stage
Two plants were planted at a depth of 1. Thereafter, it was submerged with water to a depth of 1 cm and left in a greenhouse. 3 days after transplanting paddy rice (before germination of wildflowers)
Then, 10 days after transplanting paddy rice (two-leaf field stage), a predetermined amount of the herbicide composition of the present invention, prepared according to the method shown in Example 3, as specified in the school regulations, was sprayed by hand. The plants were then placed in a greenhouse and watered at appropriate times. Three weeks after the chemical treatment, the herbicidal effect and damage to paddy rice were investigated. Table 1 shows the results of the treatment 3 days after rice transplantation, and Table 2 shows the results of the treatment 10 days after rice transplantation.

In addition, in Tables 1 and 2, "drug amount" indicates a value obtained by converting the amount of active ingredient into the amount per 1 are of paddy field.

Evaluation of herbicidal effect and phytotoxicity was made according to the following criteria.

Weeding effect determination criteria Chemical damage determination criteria 10100%
Pest control - 2 no Harm 9: 90% control
Master:? X1 Minor damage 8: 80% control +: Small Harm 7: 70% control +: Medium Harm 6: 60% control +1 + 2 Major damage 5: 50% control
×: Blight 4: 40% control 3: 30% control 2: 20% control 1: 10% control 0: 0% control As a comparative example, each active ingredient compound was used alone or in combination in the same manner as in the above example. Evaluations of herbicidal effects and phytotoxicity in treated and untreated plots were also conducted according to the above criteria and are shown in each table.

Although the excellent synergistic effect of each active compound brought about by the present invention is already clear from the results of Example 4, it will be further explained in more detail using Cyperus japonica, which is one of the difficult-to-control weeds, as a representative species.

As a method for assaying the interaction of three active compounds, the Colby formula described in Weeds 154', pp. 20-22, 1967 is usually used. That is, however, the herbicidal effect (χ) when X-compound a is used in pg/a Y-
Herbicidal effect (χ) when compound C is used at qg/a Z-Herbicidal effect (χ) when compound C is used at rg/a E=a, b
, c is the expected herbicidal effect (χ) when p+q and rg/a are mixed, respectively. If the value of the actually measured herbicidal effect (%) exceeds E, it means that the composition has a synergistic effect. It shows.

EXAMPLES Hereinafter, the interaction test of the herbicide composition of the present invention and its results will be shown in Examples.

Example 5 A plastic container with an area of 1 B 36 cd (31 x 56 cm) was filled with paddy soil in a paddy state to a depth of 7 cm from the bottom, and 10 tubers of Cyperus japonica were transplanted into the container. The next day, the plants were flooded with water for 33 days and grown in a greenhouse. transplant 7
After a day, a predetermined amount of granules containing the herbicide composition of the present invention prepared according to Example 3 and each existing active ingredient compound alone were sprayed by hand. The plants were then placed in a greenhouse and watered at appropriate times.

After 30 days of chemical treatment, the remaining stems and leaves of Cyperus japonica were cut and collected, the air dry weight was measured, and the herbicidal effect was calculated using the following formula, and the results are shown in Table 3.

Herbicidal effect (χ) = (air dry weight of untreated area) Table 3, [Effect of the invention] As is clear from Tables 1, 2, and 3, the herbicidal composition of the present invention Compared to the case where the active ingredient is applied alone, the plate force is significantly enhanced. This is due to the synergistic effect between each active ingredient, and it is recognized that there is a significant synergistic effect.

In other words, the greatest feature of the herbicide composition of the present invention is that a high herbicidal effect on many weeds can be obtained by combining low dosages that could not be expected from the herbicidal effect of each active ingredient alone. I can list things that I can do.

In addition, the herbicide composition of the present invention exhibits remarkable herbicidal activity not only against weeds at the early stage of growth but also against weeds at a certain stage of advanced growth. One of its excellent features is that it has a wide range of suitable processing periods.

In addition, there are many types of weeds that can be controlled, and a remarkable herbicidal effect has been observed on annual weeds such as Japanese wild grass, Japanese cypress, Japanese cypress, and perennial weeds such as Japanese firefly, Japanese cypress, and Japanese snail. Moreover, it does not cause any chemical damage to transplanted paddy rice, making it highly useful as a highly safe and highly selective herbicide. Furthermore, each active ingredient has a long residual effect, so it exhibits high herbicidal activity over a long period of time and can control many weeds.
It greatly contributes to the reduction of spraying labor, that is, the labor saving of agricultural work.

As described above, the herbicidal composition of the present invention has many excellent features and is highly practical.

Claims (1)

[Claims] O-3-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate or O-4-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate 1 type or 2 types and N-(α,α-dimethylbenzyl)-2
-bromo-3,3-dimethylbutyramide and 4-(
2,4-dichlorobenzoyl)-1,3-dimethyl-5
- A herbicide composition containing phenacyloxypyrazole as an active ingredient.