JPH0651607B2 - Herbicidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 2- (4-chloro-2-fluoro-5-propargyloxyphenyl) -5,6,7,8-tetrahydro-1.
H-1,2,4-triazolo- (1,2-a) -pyridazine-1,3
-2H-dione (hereinafter referred to as compound [I]) and 2-amino-4 [(hydroxy) (methyl) phosphionyl]
The present invention relates to a herbicidal composition (hereinafter referred to as the composition of the present invention) containing butyryl-alanylalanine or a salt thereof (hereinafter referred to as bialaphos) as an active ingredient.

Currently, many herbicides are used for cultivated land or non-cultivated land, but weeds to be controlled have many types and their occurrence is long-term, so the herbicidal effect is higher,
The development of herbicides with a wide spectrum of herbicidal activity is desired.

As a result of various investigations by the present inventors to develop a herbicide which meets such an object, the composition of the present invention containing the compound [I] and bialaphos as an active ingredient is cultivated or non-cultivated land. It controls a wide range of weeds that occur, and its herbicidal effect is synergistically increased as compared with the case where they are used alone, they can be applied at a low dose, and they find that the herbicidal spectrum is broadened. completed.

Examples of weeds that can be controlled by the composition of the present invention include buckwheat vine, sanaetade, purslane, chickweed, white azalea, blue-toothed radish, Japanese radish, velvetleaf, nazuna, horned squirrel, ebisugusa, hornbill, american stag deer, field pansy, yamgra, american morning glory, malva. Broad-leaved weeds such as, Convolvulus vulgaris, Anopheles lanceolata, Latrodectus mackerel, Datura strechata, Datura periwinkle, Periwinkle, Geranium, Sunflower, sunflower, dog chamomile, Corn marigold etc. , Grass, weeds, weeds, etc., and weeds, weeds, weeds, weeds, etc. Cyperaceae weeds such as sedges and the like.

Compound [I] (US Pat. No. 4,452,981) has herbicidal activity, and Bialaphos [Hodogaya Kagaku ed. Short Revi
ew of Herbicide (1982)] is known as a herbicide.

The mixing ratio of the compound [I], which is an active ingredient of the composition of the present invention, and bialaphos can be changed in a relatively wide range, but normally, bialaphos is added to 1 part by weight of the compound [I].
It is 0.1 to 70 parts by weight, preferably 0.5 to 70 parts by weight.

Table 1 shows the chemical structural formulas of the compound [I] and bialaphos.

As the salt of 2-amino-4 [(hydroxy) (methyl) phosphionyl] butyryl-alanylalanine, sodium salt and the like can be mentioned.

When the composition of the present invention is used as a herbicide, it is usually mixed with a solid carrier, a surfactant and other auxiliaries for formulation to prepare a wettable powder, a suspension or the like.

These preparations contain the active ingredient in an amount of 1 to 90% by weight, preferably 2 to 80%.

Examples of the solid carrier include kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, fine powders of powdered synthetic hydrous silicon oxide, or powdery substances. .

As a surfactant used for dispersion, wet extension, etc.,
Anionic surfactants such as alkyl sulfate ester salts, alkyl aryl sulfonates, dialkyl sulfosuccinates, polyoxyethylene alkyl aryl ether phosphate ester salts, polyoxyethylene alkyl ethers,
Examples thereof include nonionic surfactants such as polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester. Examples of the auxiliaries for formulation include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (isopropyl acid phosphate) and the like.

Formulation examples are shown below. In addition, a part shows a weight part.

Formulation Example 1 25 parts of compound [I], bialaphos (sodium salt), 25 parts of calcium ligninsulfonate, 3 parts of sodium laurin sulfate and 45 parts of synthetic hydrous silicon oxide are well pulverized and mixed to obtain a wettable powder.

Formulation Example 2 Compound [I] 10 parts, bialaphos (sodium salt) 15 parts, polyoxyethylene sorbitan monooleate 3 parts, CMC3
Parts and 69 parts of water are mixed and wet-ground until the particle size becomes 5 microns or less to obtain a suspension agent.

The composition of the present invention thus formulated is subjected to foliar treatment after emergence of weeds. The foliage treatment includes not only treatment from above the plant body but also local treatment such as treatment of only weeds so as not to adhere to crops. Further, by treating the composition of the present invention with soil, it is possible to control the generation of weeds after the treatment, and it does not show any phytotoxicity which is a problem for crops such as soybean, cotton, corn and wheat. In addition, the herbicidal effect can be expected to be enhanced by using it in combination with other herbicides. Furthermore, it can be used by mixing with insecticides, acaricides, nematicides, fungicides, plant growth regulators and the like.

The composition of the present invention can be used as a herbicide for fields, fallows, orchards, pastures, lawns, forests or non-agricultural lands. Especially in the field, it can be used for no-tillage farming other than the usual treatment method.

The application rate of the composition of the present invention varies depending on the mixing ratio of active ingredients, formulation form, type of target weeds, weather conditions, etc., but the total amount of active ingredients per are is usually 1 g to 80 g, preferably 3 g. The amount of wettable powder, suspending agent, etc. is usually diluted with 1 liter to 10 liters per are of water (if necessary, an auxiliary agent such as a spreading agent is added). To process.

As the spreading agent, in addition to the above-mentioned surfactant, polyoxyethylene resin acid (ester), lignin sulfonate,
Examples thereof include abietic acid salt, dinaphthylmethane disulfonic acid salt, and paraffin.

Next, the herbicidal effect of the composition of the present invention will be specifically shown with reference to test examples.

The herbicidal efficacy was calculated by the following formula by measuring the fresh weight of the above-ground parts of the test plants that remained dead during the survey.
Indicate.

Test Example 1 Field and foliage treatment test A bat having an area of 33 × 23 cm ² and a depth of 11 cm was filled with field soil,
Tubers of Chinese nutsedge and rhizomes of sorghum were transplanted and grown for 35 days. After that, the test sample was made into a wettable powder according to Formulation Example 1, and a predetermined amount thereof was diluted with 5 liters of water per 1 are containing a spreading agent, and then the whole foliage part from above the plant body with a small sprayer. Uniformly processed. At this time, the growth conditions of weeds and crops differed depending on the grass species, but at the 5 to 9 leaf stage, the plant height was 20 to 60 cm. The herbicidal efficacy was investigated 28 days after the treatment. The results are shown in Table 2. The test was conducted in a greenhouse throughout the entire period.

The results of Table 2 are the iso-effect method [Junichi Fukami, Yasuhiko Uesugi, Kozo Ishizuka, Chojiro Tomizawa, "Agricultural Chemicals Experimental Method", Volume 3, Herbicides, Volume 1
Edition 109-111 (1981, published by Soft Science Co., Ltd.)]. The results are shown in FIGS. From the figure, it is clear that the composition of the present invention has a synergistic effect.

Test Example 2 Field and foliage treatment spectrum test Field yard soil was packed in a vat with an area of 33 × 23 cm ² and a depth of 11 cm,
Barnyard grass, green foxtail, black clover, Malva morning glory,
Ichibi, Ebisugusa, Onami fir, and sunflower were sown, and the rhizome of the sorghum was transplanted and grown for 35 days. After that, the test sample was made into a wettable powder according to Formulation Example 1, and a predetermined amount thereof was diluted with 5 liters of water per 1 are containing a spreading agent, and then the whole foliage part from above the plant body with a small sprayer. Uniformly processed. At this time, the growth conditions of weeds and crops differed depending on the grass species, but at the 3 to 8 leaf stage, the plant height was 5 to 60 cm. The herbicidal efficacy was investigated 28 days after the treatment. The results are shown in Table 3. The test was conducted in a greenhouse throughout the entire period.

[Brief description of drawings]

(1) FIG. 1 is a diagram drawn by the contour line method based on the herbicidal efficacy against the Chinese nutsedge in Table 2 in Test Example 1. The vertical axis shows the dose of bialaphos (sodium salt) (g / a)
And the horizontal axis represents the dose (g / a) of compound [1]. The dashed line is the line for additive effects, and the solid line is the growth inhibition rate.
Represents 70% contour lines respectively. (2) FIG. 2 is a diagram drawn by the contour line method based on the herbicidal efficacy against Sorghum sorghum in Table 2 in Test Example 1. The vertical axis shows the dose of bialaphos (sodium salt) (g / a)
And the horizontal axis represents the dose (g / a) of compound [1]. The dashed line is the line for additive effects, and the solid line is the growth inhibition rate.
Represents 70% contour lines respectively.

Claims (1)

[Claims] 1. 2- (4-Chloro-2-fluoro-5-propargyloxyphenyl) -5,6,7,8-tetrahydro-1H-1,2,4-triazolo- (1,2-a) -Pyridazine-
1,3-2H-dione and 2-amino-4 [(hydroxy)
A herbicidal composition comprising (methyl) phosphionyl] butyryl-alanylalanine or a salt thereof as an active ingredient.