JPH06122603A - Herbicidal composition - Google Patents

Abstract

(57) [Summary] [Objective] To provide a herbicidal composition for non-agricultural land, which has a wide range of herbicidal species, is fast-acting, has a suitable treatment period, is inexpensive, and can suppress large weeds. Composition: 3- (5-tert-butyl-3-isoxazolyl) -1,1-dimethylurea and 2,2
A herbicidal composition comprising sodium 3,3-tetrafluoropropionate as an active ingredient.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a herbicide used in non-arable land.

[0002]

2. Description of the Related Art Weed control on non-agricultural land has various purposes and situations. The characteristics of the weeds are that there are many species of grass and many large weeds. In addition, there is a desire from the user's side to die quickly, to desire long-term weeding, and to be easy to treat. There are many.

Under these circumstances, the chemicals used are wide-ranging, from non-agricultural land exclusive agents to diversion of field-acting herbicides, which are not so strong in killing power. In addition, there are a wide variety of dosage forms, from those diluted with water to use, and granules that can be sprayed as they are.

3- (5-tert-butyl-3-isoxazolyl) -1,1-dimethylurea (hereinafter referred to as compound 1) is used as a photosynthesis-inhibiting herbicide. The characteristics of this herbicide are that it has a high activity at a low dosage, has a relatively wide range of herbicidal species, is highly effective for perennial weeds, has a long weeding period, etc. and is used in non-agricultural fields. Often. The dosage used is the purpose of use, dosage form, grass species,
It depends on weed density, plant height, climate, soil, etc. In this case, the amount of annual weeds used in a small amount of weeds such as upland may be small, but the amount of non-agricultural land with a large amount of weeds may be large. Practically used amount is 100g ~
1000 g / 10a is required, and perennial weeds that have grown further require 500 to 1000 g / 10a.

On the other hand, sodium 2,2,3,3-tetrafluoropropionate (hereinafter referred to as compound A) is a soil-treatment type herbicide that has been known for a long time. The application is mainly for the control of bamboo grass and Japanese pampas grass in forests such as cedar and cypress. Its herbicidal activity is high in grasses, and practically 1
It is from 00 to 300 g / 10a. For perennial plants such as Japanese pampas grass before germination, the amount is 300 to 600 g / 10a. However,
Hardly effective on broadleaf weeds. In addition, it is a herbicide that has the characteristics of showing little activity in the current year even if it is applied to the more advanced grass perennial weeds and suppressing the germination of the following year.

[0006]

Recently, the use of herbicides by the general public has been increasing, and there is an increasing demand for a fast-acting and easy-to-use herbicide, and a medicine which is effective in any situation. . In addition to controlling costs, reducing the dosage is also an important issue, focusing on environmental issues. At present, there is no drug that can meet these various requirements with a single agent, and various drugs are used properly according to the purpose, but they do not always meet the requirements, and more appropriate and easy-to-use agents are required.

Although the compound 1 has a wide range of herbicidal species, the difference in sensitivity is large. The perennial herb has a short duration. In grasses, the herbicidal effect becomes insufficient as the plant height increases.
For this reason, there is a drawback that the dosage is large in a non-arable land where various kinds of weeds are mixed. Therefore, in order to apply it to non-agricultural land where various kinds of weeds are mixed, there are many problems that must be solved, such as reducing the amount of drug, increasing the effect of foliar treatment, and extending the duration. .

On the other hand, Compound A has many drawbacks such as no foliar treatment effect and no effect on broad-leaved weeds. In addition, it requires a considerable amount of chemicals to control perennial herbs, and is suitable for use on non-cultivated land. Has issues that must be solved, such as reducing the dose and imparting a foliar treatment effect.

[0009]

In order to solve these problems, the present inventors have studied various mixing methods, and as a result, by mixing compound 1 and compound A in a relatively low dose, It was found that a synergistic effect far exceeding the effects of each single use can be obtained. Further, in order to enhance this effect to a practical utility value, the present invention has been completed by further studying the dosage, mixture ratio, dosage form, foliar treatment effect, duration and the like.

Due to the synergistic effect of the present invention, the foliar treatment effect is enhanced, the herbicidal period is prolonged, the herbicide species range is widened, and the doses of both compounds can be reduced, and many problems are solved at once. Can be resolved.

That is, the present invention provides 3- (5-tert-butyl-3-isoxazolyl) -1,1-dimethylurea (Compound 1) and sodium 2,2,3,3-tetrafluoropropionate (Compound A). It is a herbicidal composition characterized by containing and as an active ingredient.

Compound 1 alone was used to control 400 g / 10% of the compound for controlling broad-leaved annual leaves of Artemisia japonicum and grasshopper of the family Gramineae.
a was required, but by adding the compound A, 200 g / 10a of the compound 1 and 100 g / 10a of the compound A were added.
Now, not only is it possible to obtain a sufficient control effect, but it has also become possible to significantly extend the time of recurrence.

In addition, when the height of the large weeds of Japanese pampas grass is close to 1 meter and leaves are hardened, even if compound 1 is sprayed at 1000 g / 10a,
While the strain source often regenerates without dying, a sufficient killing effect can be obtained by reducing the amount of compound 1 by about 10 to 30% and adding compound A in that amount, and Completely suppressed regeneration. Even if it is used in a dosage form such as granules that does not adhere to the foliage, complete control is still possible.

On the other hand, Compound A has no foliar treatment effect,
By adding a small amount of compound 1, it became possible to obtain a considerable foliar treatment effect.

In the present invention, the dosage is 50 to 500 g / 10a in addition to the compound 1 while exhibiting the above effects.
In addition, Compound A could be reduced to 50-300 g / 10a. It goes without saying that a wider range of uses can be made depending on the purpose. Therefore, it has become possible to significantly reduce the total amount of drug used.

That is, the synergistic effect in the present invention is recognized in a wide range of the ratio of the amount of the drug used, which is about 20: 1 to 1:20. Therefore, the drug mixture ratio can be widely selected according to the intended scene and usage. It is possible to

In applying the composition of the present invention,
Formulations such as powders and fine granules that can be applied as they are, such as a wettable powder of the type that adheres to foliage, a sol, etc., can be applied. Further, the effect of the present invention can be exerted even on the type of granules that do not adhere to the foliage, and thus can be applied. Wettable powder, sol, etc. diluted with water and sprayed are 50 to 500 l /
Spraying at 10a is preferred. Further, it is preferable that the powder, fine granules, granules and the like to be applied as they are are sprayed at 5 to 30 kg / 10a. The amount of spraying depends on the content of the active ingredient,
It can be selected within a range where uniform spraying is possible.

As the carrier used in the composition of the present invention, in the case of a solid, an inert mineral such as bentonite, clay or zeolite can be used. For liquids,
Water, various organic solvents and animal and vegetable oils can be used.

As the dispersant or the fixing agent, an anionic or nonionic surfactant can be used. Examples of these surfactants include sodium lignin sulfonate, condensate of alkylnaphthalene sulfonate formalin, dialkyl sulfosuccinate, polyoxyethylene lauryl ether, polyoxyethylene alkylaryl ether, and polyoxyethylene dodecyl ether.

Further, auxiliary agents such as a thickener, a defoaming agent and a stabilizer can be added if necessary.

[0021]

EXAMPLES Next, the present invention will be described in more detail by way of examples. In the examples, a composition formulation was used as a formulation example, and an effect test was used as a test example. In the examples, all parts are parts by weight.

[Formulation Example 1] Wettable powder (Formulation C of the present invention-
1) 30 parts of compound 1, 20 parts of clay, 3 of white carbon
10 parts of compound A was dissolved in a small amount of water and mixed, and then clay 2 was added.
7 parts and 3 parts of white carbon were added and mixed well. After drying, 6 parts of powdered surfactant Solpol (trademark of Toho Chemical Co., Ltd.) 5039 and rapizole BB (NOF CORPORATION)
Trademark) 75 part was added and mixed uniformly to obtain a wettable powder containing 30% of compound 1 and 10% of compound A.

[Formulation Example 2] Sol agent (Formulation C of the present invention-
2) 20 parts of compound 1, 30 parts of water, and the surfactant SOLPOL 3
742, and SOLPOL 5712 as an antifoaming agent.
5 parts were added and crushed with a sand grinder. After the removal, 4 parts of ethylene glycol, 0.2 part of VANGEL-B (trademark of Sanyo Kasei Co., Ltd.) and 38.3 parts of an aqueous solution adjusted to 20 parts of the compound A were added and well stirred, and the compound 1 was added. To obtain a sol containing 20% of Compound A and 20% of Compound A.

[Formulation Example 3] Fine granules (Formulation C of the present invention-
3) While stirring 4 parts of compound 1, 62.5 parts of finely divided zeolite, 33 parts of finely divided calcium carbonate (all 48 to 150 mesh) and 1 part of white carbon in a speed kneader, 1 part of compound A, poly An aqueous solution in which 2 parts of oxyethylene nonylphenyl ether and 1 part of dialkylsulfosuccinate were dissolved was added. Further, 0.5 part of white carbon was added while checking the fluidity, and after taking out, it was dried with hot air to obtain a fine granule containing 4% of compound 1 and 1% of compound A.

[Formulation Example 4] Granules (Formulation C-4 of the present invention) 2 parts of compound 1 and 3 parts of compound A, 43 parts of clay, 50 parts of bentonite, 3 parts of polyoxyethylene lauryl ether, 3 parts of dialkylsulfosuccinate Water was added to 1.5 parts of nate, kneaded well in a kneader, granulated by a granulator, and dried to obtain granules containing 2% of compound 1 and 3% of compound A. .

{Test Example 1} Pot Test (Soil Treatment Test) A dice pot of 11.5 cm (100 cm ² ) in diameter was filled with diluvial ash soil, and 0.5 cm of the surface layer was mixed with seeds of Crabgrass and Aoyu. After flattening the surface, a chemical solution containing a predetermined amount of Compound 1 and Compound A alone or in a mixture was uniformly treated on the soil surface using a spray gun at a low pressure of 100 l / 10a. . An observational study was conducted one month later. The results are shown in [Table 1].

The results of the examination by observation are displayed according to the following evaluation criteria. 0: Same as no treatment 1: 10% control or control 6: 60% control or control 2: 20% control or control 7: 70% control or control 3: 30% control or control 8: 80% control or control 4: 40% control or control 9: 90% control or control 5: 50% control or control 10: Complete control

[0028]

[Table 1]

{Test Example 2} Pot Test (Stem and Leaf Treatment Test) A pot prepared in the same manner as in Test Example 1 was used for plant growth,
The growth was controlled including thinning so that the density was uniform. A drug solution containing a predetermined amount of compound 1 and compound A alone or in a mixture was uniformly sprayed at a pressure of 100 l / 10a at a low pressure on a spray gun at the five-leaf stage of each of the crabgrass and the pearl millet. In the same manner as in Test Example 1,
An observational study was conducted one month later. The results are shown in [Table 2].
Shown in. The evaluation criteria by observation are the same as in Test Example 1.

[0030]

[Table 2]

{Test Example 3} Field test (first-year weeds) First place weeds are selected such that the crabgrass and communis weeds have priority, and a unit area of 2 m square is provided and the weed height is 20.
When the concentration is about cm, a nonionic surfactant is added to a chemical solution containing a predetermined amount of compound 1 and compound A alone or in a mixture.
It was added so that the concentration would be 0 ppm, and the amount of the liquid was 100 l / 10a, and the mixture was sprayed uniformly in the section using a sprayer. Fine granules and granules were hand-wound. Observational investigations were conducted after 2 weeks, 1 month, and 3 months. The results are shown in [Table 3]. The evaluation criteria by observation are the same as in Test Example 1.

[0032]

[Table 3]

{Test Example 4} Field test (perennial weeds) Separately selected priority places of Solidago virginii and Japanese pampas grass, each having a unit area of 3 m square, and a plant height of 70 to 80 c
When m, the composition of the present invention was sprayed in the same manner as in Test Example 3. However, the amount of spray liquid was 200 l / 10a. Observational investigations were performed after one, two, and four months.
The results are shown in [Table 4]. Evaluation criteria by observation are Test Example 1
Is the same as.

[0034]

[Table 4]

[0035]

Since the composition of the present invention exerts a synergistic effect far exceeding the effect of a single use, it is possible to extend the suitable treatment period, widen the range of herbicidal species, and reduce the dose. . This has made it possible to control weeds efficiently and inexpensively in places where various kinds of weeds coexist, such as non-agricultural land.

Front page continuation (72) Inventor Tatsuo Ansai 45 Miyukigaoka, Tsukuba City, Ibaraki Prefecture Hodogaya Chemical Industry Co., Ltd. Tsukuba Research Institute (72) Inventor Masao Hirabayashi 3-chome, Doshomachi, Chuo-ku, Osaka-shi, Osaka Shionogi Pharmaceutical Co., Ltd.

Claims (1)

[Claims] 1. 3- (5-Tertiarybutyl-3-isoxazolyl) -1,1-dimethylurea and 2,
A herbicidal composition comprising sodium 2,3,3-tetrafluoropropionate as an active ingredient.