JP2531235B2 - Herbicidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION 2- [7-fluoro-3,4-dihydro-3-
Oxo-4- (2-propynyl) -2H-1,4-benzoxazin-6-yl] -4,5,6,7-tetrahydro-1H-
Isoindole-1,3 (2H) -dione (hereinafter referred to as compound [I]) and 2- [4,5-dihydro-4-methyl-4- (1-methylethyl) -5-oxo-1H -Imidazol-2-yl] -3-quinolinecarboxylic acid (hereinafter,
It is referred to as Imazakin. And a herbicidal composition (hereinafter, referred to as the composition of the present invention) containing as an active ingredient.

Currently, many herbicides are commercially available and used,
Since there are many kinds of weeds to be controlled and the occurrence thereof is long-term, the herbicides are more effective, have a wide spectrum of weeding, and safe herbicides are required for crops.

As a result of various studies to develop a herbicide which meets such an object, the present inventors have found that the composition of the present invention containing the compound [I] and imazaquin as active ingredients is used in various weeds, especially soybean fields. It has been found that a wide range of weeds can be selectively weeded, and that their herbicidal efficacy is synergistically increased as compared with the case where they are used alone, they can be applied at a low dose, and the herbicidal spectrum is broadened. Was completed.

The composition of the present invention is a main weed of soybean fields, for example, buckwheat vine, sana edode, american spodoptera, purslane,
White-faced, Blue-necked Squirrel, White-bellied Pepper, American horned squirrel, Ebisugusa, Ichibi, American gold stag, American morning glory, Malva morning glory, Malva american morning glory, Datura morning glory, Physalis chinensis, Onami, sunflower, Hiruga, Todaidaigusa
Effectively weeding dicotyledonous plants such as American sedgegrass, ragweed and monocotyledonous plants such as barnyardgrass, green foxtail, green foxtail foxtail, foxtail foxtail foxtail, chinenokoro, mejishiba, oenshiba, seibanmokoshi, rye barley, shutter cane, and soybeans as crops. It does not cause serious chemical damage.

The fact that compound [I] has herbicidal activity is disclosed in US Pat. No. 46.
No. 40707, and Imazakin is described in Far.
m Chemicals Handbook '86 (published by Meister Publishing Co., 1986) C207, a known herbicide.

The mixing ratio of the compound [I], which is the active ingredient of the composition of the present invention, and imazaquin can be varied within a relatively wide range, but normally, imazaquin is 0.5 to 1 part by weight of the compound [I]. It is 40 parts by weight, preferably 1 to 20 parts by weight.

The composition of the present invention is usually mixed with a solid carrier, a liquid carrier, a surfactant, and other auxiliaries for formulation to prepare an emulsion, a wettable powder,
It is used as a suspension, a granule and the like.

Examples of the solid carrier include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut shell powder, urea, ammonium sulfate, fine powder or particles of synthetic hydrous silicon oxide and the like. As the liquid carrier, aromatic hydrocarbons such as xylene and methylnaphthalene, isopropanol,
Alcohols such as ethylene glycol and cellosolve, ketones such as acetone, cyclohexanone and isophorone,
Vegetable oils such as soybean oil and cottonseed oil, N, N-dimethylformamide, dimethylsulfoxide, acetonitrile, water and the like can be mentioned.

Examples of surfactants include anionic interfaces such as alkyl sulfate ester salts, alkyl aryl sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkyl aryl ether phosphoric acid ester salts used for emulsification, dispersion, and wet extension. Examples include nonionic surfactants such as activators, polyoxyethylene alkyl ethers, polyoxyethylene alkylaryl ethers, polyoxyethylene polyoxypropylene block copolymers, sorbitan fatty acid esters, and polyoxyethylene sorbitan fatty acid esters.

Other auxiliaries for formulation include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (isopropyl acid phosphate) and the like.

These preparations contain 0.5 to 90% by weight, preferably 1 to 80% by weight of the active ingredient. Next, formulation examples are shown.
Parts represent parts by weight.

Formulation Example 1 5 parts of compound [I], 40 parts of imazaquin, 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate and 50 parts of synthetic hydrous silicon hydroxide are well pulverized and mixed to obtain a wettable powder.

Formulation Example 2 Compound [I] 1 part, imazaquin 20 parts, polyoxyethylene sorbitan monooleate 3 parts, CMC 3 parts and water 73
Parts are mixed and wet milled until the particle size is 5 microns or less to obtain a suspending agent.

Formulation Example 3 1 part of compound [I], 4 parts of imazaquin, 1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignin sulfonate, 30 parts of bentonite and 62 parts of kaolin clay are well pulverized and mixed,
After adding water and kneading well, it is granulated and dried to obtain granules.

These preparations are used as they are or diluted with water or the like for soil treatment. In the soil treatment, the preparation is usually sprayed on the soil surface, and if necessary, mixed with the soil surface after spraying.

The appropriate amount of application of the composition of the present invention cannot be unconditionally specified due to differences in weather conditions, soil conditions, drug formulation forms, types of active ingredients, mixing ratios, etc., but generally the total amount of active ingredients per hectare is 50 to 600 g. It is preferably 100 to 300 g. Emulsions, wettable powders, suspensions and the like are usually applied after diluting a predetermined amount thereof with 100 to 1000 water per hectare, and granules and the like are generally applied as they are without any dilution.

The composition of the present invention can be expected to enhance herbicidal efficacy by mixing with other herbicides, and can also be used as a mixture with insecticides, fungicides, plant growth regulators, fertilizers, soil conditioners and the like. .

Next, the effects of the composition of the present invention will be specifically described with reference to test examples.

The herbicidal efficacy is shown by the growth inhibition rate (%) calculated by the following formula by measuring the fresh weight of the above-ground portion of the test plant that remained dead during the survey.

Test Example 1 A bat having an area of 17 × 24 cm ² and a depth of 7 cm is filled with upland soil,
Soybean, velvetleaf, morning glory, southern fir, Ebisugusa, physalis perforatum, black foxtail, sorghum, and barnyard grass were sown and covered with a soil having a thickness of 1 to 2 cm. A prescribed amount of the wettable powder prepared in accordance with Formulation Example 1 was diluted with water equivalent to 10 liters per are, and sprayed on the soil surface with a small sprayer. After the treatment, it was grown in a greenhouse for 20 days and the herbicidal effect was investigated.

 The results are shown in Table 1.

Test Example 2 A bat having an area of 10 × 16 cm ² and a depth of 6 cm is filled with upland soil,
Malaga morning glory was sown and covered with a soil having a thickness of 1 to 2 cm. A prescribed amount of the composition of the present invention made into a wettable powder according to Formulation Example 1
It was diluted with water equivalent to 10 liters per are and sprayed on the soil surface with a small sprayer. After processing, grow outdoors for 20 days,
The herbicidal effect was investigated.

 The results are shown in Table 2.

The results of Table 2 are the iso-effect method [Refer to Junichi Fukami, Yasuhiko Uesugi, Kozo Ishizuka, Chojiro Tomizawa, pesticide experiment method Volume 3 herbicide 1st edition 109-111 (1981) Soft Science Publishing] It was drawn by. The results are shown in Fig. 1.

From FIG. 1, it is clear that the composition of the present invention synergistically exhibits herbicidal activity.

[Brief description of drawings]

FIG. 1 is drawn by the contour line method based on the herbicidal effect on Malaga morning glory in Table 2 in Test Example 2. The vertical axis represents the dose (g / ha) of compound [I], and the horizontal axis represents the dose (g / ha) of imazaquin. The additive effect with a growth inhibition rate of 80% is shown by a broken line, and the isoeffect line with an actual growth inhibition rate of 80% is shown by a solid line.

Claims (1)

(57) [Claims] 1. 2- [7-Fluoro-3,4-dihydro-3
-Oxo-4- (2-propynyl) -2H-1,4-benzoxazin-6-yl] -4,5,6,7-tetrahydro-1H
-Isoindole-1,3 (2H) -dione and 2- [4,5-dihydro-4-methyl-4- (1-methylethyl) -5-
A herbicidal composition comprising oxo-1H-imidazol-2-yl] -3-quinolinecarboxylic acid as an active ingredient.