JP2531234B2 - Herbicide 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 4-amino-6-tert-butyl-3
-Methylthio-1,2,4-triazin-5 (4H) -one (hereinafter referred to as metribuzin) as an active ingredient and relates to a herbicidal composition (hereinafter referred to as composition of the present invention). is there.

Currently, many herbicides are marketed and used, but the weeds to be controlled are many types and their outbreaks are long-term, so they have a higher herbicidal effect, have a broader herbicidal spectrum, and Require safe herbicides.

The present inventors have conducted various studies in order to develop a herbicide that meets such purposes, and as a result, the composition of the present invention containing compound [I] and metribuzin as active ingredients has been used in various weeds, especially in 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 in a soybean field, for example, buckwheat vine, sanaetade, american spodoptera, purslane, white azalea, blue-toothed peach, velvetgrass, horned grass, ebisugusa, hornbill, american stag beetle, american morning glory, malva morning glory, malva americana. Dicots such as morning glory, Datura strechata, hollyhock, ragweed, southern fir, sunflower, western bindweed, euphorbiaceae, sedgegrass, sedgegrass, etc. It does not cause harmful chemical damage to soybean which is a crop.

The fact that compound [I] has herbicidal activity is disclosed in US Pat. No. 46.
40707 and metribuzin is
he Pesticide Manual 7th Edition (The British Crop Counci
(Issued 1983) It is a known herbicide described on page 380.

The mixing ratio of the compound [I], which is the active ingredient of the composition of the present invention, and metribuzin can be varied within a relatively wide range, but usually 1 to 60 parts of metribuzin is added to 1 part by weight of the compound [I]. Parts by weight, preferably 2 to 30 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. The parts are parts by weight.

Formulation Example 1 5 parts of compound [I], 45 parts of metribuzin, 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate and 45 parts of synthetic hydrous silicon oxide are well pulverized and mixed to obtain a wettable powder.

Formulation Example 2 0.5 parts of compound [I], 20 parts of metribuzin, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC and 73.5 parts of water are mixed and wet-milled until the particle size becomes 5 microns or less to obtain a suspension agent. obtain.

Formulation Example 3 0.5 part of compound [I], 10 parts of metribuzin, 1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignin sulfonate, 30 parts of bentonite and 56.5 parts of kaolin clay were well pulverized and mixed, and after adding water and kneading well , Granulate and dry 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 and mixing ratios of active ingredients, but generally the total amount of active ingredients per hectare is 50 to 1200 g. It is preferably 100 to 800 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 represented by the growth inhibition rate (%) calculated by the following formula by measuring the fresh weight of the aerial part of the test plant that remained dead during the test.

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, black-eared fir, Malva morning glory, black horned squirrel, Ebisugusa, Enokurogusa, crabgrass, hibiscus,
The Japanese physalis was sown and covered with soil to 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, the plants were grown outdoors 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,
Shrimp grass was sown and covered with a soil having a thickness of 1 to 2 cm. A predetermined amount of the composition of the present invention made into a wettable powder according to 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, the plants were grown outdoors for 20 days and 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 a diagram drawn by the contour line method based on the herbicidal effect on Echinacea 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 metribuzin. The additive effect of the growth inhibition rate of 90% is shown by a broken line, and the actual effect line of the actual growth inhibition rate of 90% 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 4-amino-
A herbicidal composition comprising 6-tert-butyl-3-methylthio-1,2,4-triazin-5 (4H) -one as an active ingredient.