JPH03246204A - Herbicide composition for upland farming and weeding - Google Patents

Abstract

PURPOSE:To obtain a herbicide composition for upland farming, showing synergistic effects, exhibiting high effects with a small amount of herbicide free from phytotoxicity, containing a 3-substituted phenylpyrazole derivative and a sulfonylurea-based compound. CONSTITUTION:A herbicide composition for upland farming containing a compound shown by the formula (R is lower alkyl; X is halogen) and a sulfonylurea- based compound (e.g. chlorsulfuron) in a weight ratio of 1:0.2-2 is produced and 1-20g calculated as active ingredient based on 1ha of the herbicide composition is applied to a plowed field of wheat to exterminate weeds. Cleavers, white- bird's-eye, Stellaria media cry., Veronica persica Poir, violet, INUKAMITSURE, etc., which have been difficult to control can be weeded and treatment is effectively carried out at initial stage of emergence and growing period of wheat and weeds.

Description

[Detailed description of the invention] The present invention relates to general formula (I) C.I.

A herbicide for field cultivation characterized by containing a 3-substituted phenylpyrazole derivative represented by the following formula and a sulfonylurea compound as active ingredients. The present invention relates to a composition and a weeding method using the herbicide composition.

Currently, many herbicides are used to control weeds in field crops such as wheat, barley, soybeans, and maize. Since the herbicides are used over a long period of time, the herbicides used have a wide herbicidal spectrum, and there is a need for herbicides that are safe for crops and exhibit high herbicidal effects at low doses.

In view of the above-mentioned current situation, the present inventors have conducted intensive research with the aim of creating a herbicide that has a wide herbicidal spectrum, controls weed growth over a long period of time, is safe for crops, and exhibits herbicidal effects at low doses. As a result of repeated studies, it was found that by combining the 3-substituted phenylpyrazole derivative represented by the above general formula (I) and the sulfonylurea compound, an unexpected degree of The present invention was completed based on the discovery that by exhibiting a synergistic effect, the dosage can be reduced and the herbicidal spectrum can be expanded.

The 3-substituted phenylpyrazole derivative represented by the general formula (I), which is one of the active ingredients of the present invention, is a new compound that has not been described in any literature. This is a compound filed as a herbicide in No. 225724. Representative compounds thereof are illustrated in Table 1.

General formula (I) CH.

Further, as the sulfonylurea compound which is the other active ingredient that can be used in the present invention, the following known compounds can be exemplified.

A, N-((4-methoxy-6-methyl-1°3.5-
triazin-2-yl)aminocarbonyl]-2-methoxycarbonylbenzenesulfonamide (-Ship name Metsulfuron-methyl, compound described in JP-A-55-13266) B, 1- (2-chlorophenylsulfonyl) 3- (4
-methoxy-6-methyl-1,3゜5-triazine-2
-Ile) Urea (-Ship name: Chlorsulfuron, special public service 1986)
-36029) C, methyl 3-[3-(4-methoxy-6-methyl-1,3,5-1-riazin-2-yl)ureidosulfonylcothiophene-2-carboxylate (- Ship name: Thiameturon-methyl, compound described in JP-A-56-103179) D, methyl 2- [3-(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-3- methylureidosulfonyl]benzoate (code name DPX-L)
5300゜BRITISH CROP PROTECTI
ON CONFERENCE WEEDS -1985
, VOL, 1. Compound described on P43) E, 1-(2-(2-chloroethoxy)phenylsulfonyl)-3-(4°-methoxy-6-methyl-1,
3,5-)-Ryazin-2-yl)urea (-Ship name: triasulfuron, compound described in JP-A-57-56452) Sulfonylurea compounds that can be used in the present invention are not limited to the above compounds. Any compound may be used as long as it can produce similar effects when mixed with the 3-substituted phenylpyrazole derivative, which is one of the active ingredients of the present invention.

The herbicide composition of the present invention exhibits herbicidal effects against a wide range of weeds in field crops, particularly in grain fields such as wheat and barley, at a low dosage, and causes no chemical damage to crops. It is a herbicide composition with excellent selectivity.

The herbicide composition of the present invention can be applied to various weeds in field crops, particularly weeds in grain fields such as wheat and barley, such as violets, chickweed, violets, violets, dog mites, staghorn shepherds, daisies daisies, staghorn daisies, sycamores, foxtails, and forget-me-nots. , hartade, sanaetade, orantamiminnagusa, buckwheat,
In addition to exhibiting excellent herbicidal effects on dicotyledonous plants such as Convolvulus japonica, Psyllium japonica, Prunus japonicus, and Oriental japonica, it also exhibits herbicidal effects on weeds of the grass family, such as Grass weeds.

The herbicide composition of the present invention is particularly useful for weeds that are conventionally difficult to control.
For example, it is possible to control at the same time violets, chickweed, violets, violets, dog mottles, snails, huskweed, snail knotweed, buckwheat, and the like.

When using the herbicide composition of the present invention, it may be formulated into an appropriate dosage form according to the purpose according to the conventional method for agricultural chemical formulations, such as solid carrier, liquid carrier, surfactant, etc. Mix with adjuvants, etc. to make granules, wettable powders, powders, etc.
It may be used by preparing it in the form of a flowable agent or the like.

The active ingredients of the herbicide composition of the present invention can be blended in any proportion in the composition depending on the dosage form, and the blending proportion of the active ingredients in the composition is expressed by general formula (I) 3 The -substituted phenylpyrazole derivative and the sulfonylurea compound may be blended in any proportion, and usually the amount of the sulfonylurea compound is 0.02 to 1 part by weight of the 3-substituted phenylpyrazole derivative represented by the general formula (I>). The amount may be selected from the range of 4 parts by weight, preferably from 0.2 to 2 parts by weight.

For example, when the herbicide composition of the present invention is used in a wheat field, it can be used from the early stage of emergence of wheat and weeds to the growing season. Furthermore, the present invention is not limited to these periods, and the soil can also be treated before the emergence of wheat and weeds, but it is preferable to treat the soil at the early stage of emergence or during the growing season.

The treatment amount of the herbicidal composition of the present invention is 0.1 to 10 per hectare as the amount of active ingredient of the herbicidal composition of the present invention.
It may be used by selecting from the range of 0g, preferably 1
~20g.

Typical examples of the present invention are shown below, but the present invention is not limited thereto.

In the examples, parts indicate parts by weight.

Example 1 Compound 1 0.1 part Compound A
0.2 parts dioctyl sulfosuccinate sodium salt 0.3 parts sodium polyacrylate 2.0 parts bentonite
35.0 parts clay
62.4 parts or more are uniformly mixed and pulverized, an appropriate amount of water is added, kneaded, granulated and dried to form granules.

Example 2 Compound 4 0.2 parts Compound A
0.1 part dioctyl sulfosuccinate sodium salt 0.3 part sodium polyacrylate 2.0 parts bentonite 35.0 parts clay
62.4 parts or more are uniformly mixed and pulverized, an appropriate amount of water is added, kneaded, granulated and dried to form granules.

Example 3 Compound 15.0 parts Compound A 7.0 parts Polyoxyethylene nonylphenyl ether 3.0 parts Calcium ligninsulfonate 3.0 parts Hydrous silicic acid fine powder
4.0 parts powdered calcium carbonate
78.0 parts or more are uniformly mixed and ground to form a wettable powder.

Example 4 Compound 4102 Compound A 5.0 parts Polyoxyethylene nonylphenyl ether 3.0 parts Calcium ligninsulfonate 3.0 parts Hydrous silicic acid fine powder
2.0 parts powdered calcium carbonate
77.0 parts or more are uniformly mixed and ground to form a wettable powder.

Example 5 16.0 parts of compound 6.0 parts of compound A 1.5 parts of polyoxyethylene nonylphenyl ether 1.5 parts of polyoxyethylene styrenated phenyl ether , wet-pulverized to make a flowable agent.

Example 6 Compound 43.0 parts Compound A 10.0 parts Polyoxyethylene nonylphenyl ether 1.5 parts Polyoxyethylene styrenated phenyl ether 1.5 parts Xanthan gum 0.2 parts Water
83.8 parts or more are mixed uniformly and wet-pulverized to obtain a flowable agent.

Test example 1. Medicinal damage to wheat and herbicidal effect 41g1.4
The plots were divided into rows of 2.8 m in area, and wheat and its accompanying weeds, such as cornweed, chickweed, shepherd's purse, and shepherd's purse, were sown.

When the growth of each plant reaches the 2-4 leaf stage and the plant height reaches 3-25 cm, a predetermined amount of the herbicide composition of the present invention is diluted with water.
The mixture was sprayed uniformly over the entire foliage surface from above the plant using a small sprayer at a rate of 500°C per hectare. 28 days after spraying
The chemical damage to wheat and the herbicidal effect to weeds were increased to 1 on the first day.
The investigation was conducted by visual judgment using the 00 point system.

The results are shown in Table 2.

Test Example 23 Examination of the synergistic effect of the composition of the present invention Diameter: 12 cm
A pot with a height of 11 cm was filled with upland soil, and the seeds of O. annuus were sown with a soil covering source of 0.5 cm. When the O. annuus fuguri was grown in a greenhouse at the 3-leaf stage and the plant height was 8 cm, the composition of the present invention was applied. dilute a predetermined amount of the drug with water,
The mixture was sprayed evenly over the entire foliage surface from above the plant using a small sprayer at a rate of 5,002 sprays per hectare. On the 21st day after spraying, the fresh weight of the above-ground parts of the withered and remaining giant dogfish was measured, and the live weight suppression rate (%) was calculated using the following formula.

Live weight suppression rate (%) = (1-) The results for Compound A and Compound A are shown in Table 4.

! Yugo The above results are shown in figures to make them easier to understand.

FIG. 1 is a plot drawn using the iso-effect line method based on the herbicidal effect on the giant dogfish shown in Table 3 in the test examples. The horizontal axis represents the amount of active ingredient (g/ha) of Compound 1, and the vertical axis represents the amount of effective acid (g/ha) of Compound A. The additive effect of 90% aboveground living body weight suppression rate is shown by the broken line. , the iso-effect line for the actual above-ground organism weight suppression rate of 90% is shown as a solid line.

FIG. 2 is a diagram drawn by the iso-effect line method based on the herbicidal effect on the giant dogfish shown in Table 4 in the test examples. The horizontal axis represents the amount of active ingredient of Compound 4 (g/ha), and the vertical axis represents the amount of active ingredient of Compound A (g/ha).Similar to Figure 1, the above-ground body weight suppression rate is 90%. The additive effect is shown by a broken line, and the isoeffect line at which the actual above-ground body weight suppression rate is 90% is shown by a solid line.

As shown in FIGS. 1 and 2, the herbicidal composition of the present invention clearly shows a synergistic effect.

[Brief explanation of drawings]

FIGS. 1 and 2 are graphs showing the synergistic effect of the herbicide composition of the present invention using the isoeffect line method. Patent applicant Nippon Nohyaku Co., Ltd. Figure 46 R! Amount of active ingredient in J1 (g/ha) Figure 2 Amount of active ingredient in Compound 4 (g/ha)

Claims (6)

[Claims] (1) General formula (I) ▲ Numerical formulas, chemical formulas, tables, etc. are available ▼ (I) (In the formula, R represents a lower alkyl group and X represents a halogen atom.) 3-substituted phenylpyrazole represented by A field herbicide composition comprising a derivative and a sulfonylurea compound as active ingredients. (2) It is characterized by containing a sulfonylurea compound as an active ingredient in a ratio ranging from 0.02 to 4.0 parts by weight per 1 part by weight of the 3-substituted phenylpyrazole derivative represented by general formula (I). The field herbicide composition according to claim 1. (3) The herbicide composition for field use according to claim 2, which is used for wheat. (4) In order to control weeds that are undesirable for the growth of field crops, there are general formulas (I) ▲mathematical formulas, chemical formulas, tables, etc.▼ (wherein, R represents a lower alkyl group, and X represents a A herbicide composition containing a 3-substituted phenylpyrazole derivative represented by (representing a halogen atom) and a sulfonylurea compound as active ingredients is used as an active ingredient amount of 0.1 per hectare.
A method for controlling weeds in field crops, the method comprising treating weeds in the range of ~100g. (5) Claim 4, characterized in that the field crop is wheat.
Control method described in section. (6) The method for controlling weeds in field crops according to claim 5, characterized in that the treatment is carried out during the beginning of emergence or growth period of field crops and weeds.