JPH0578530B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention provides 2-(4-chloro-2-fluoro-
5-propargyloxyphenyl)-5,6,7,
8-tetrahydro-1H-1,2,4-triazolo-(1,2,-a)-pyritazine-1,3-2H-
Dione (hereinafter referred to as compound []). and N-
(phosphonomethyl)-glycine or its salt (hereinafter referred to as glyphosate). The present invention relates to a herbicidal composition (hereinafter referred to as the composition of the present invention) containing as an active ingredient. Currently, a large number of herbicides are used for agricultural and non-agricultural land, but since there are many types of weeds that can be controlled and their emergence takes a long time, they are more effective at controlling weeds and can control a wide spectrum of weeds. The development of a motsuta herbicide is desired. As a result of various studies aimed at developing a herbicide that meets these objectives, the present inventors have discovered that the composition of the present invention containing the compound [ ] and glyphosate as active ingredients can be used to reduce The present invention has been completed by discovering that the herbicidal effect can be synergistically increased compared to when they are used alone, that they can be applied at lower doses, and that the herbicidal spectrum is expanded. did. Weeds that can be controlled by the composition of the present invention include buckwheat, Japanese knotweed, purslane, chickweed, whiteweed, Japanese radish, Japanese radish, Japanese daikon radish, shepherd's purse, American hornwort, Ebisu grass, Japanese commonweed, American golden deer, field pansy, Japanese violet, and American morning glory. , Maruba morning glory, Convolvulus, Convolvulus, Hotokenoza, White-bellied morning glory,
Broad-leafed weeds such as dogfish perch, Japanese dogfish, Japanese fir, sunflower, dogberry, corn marigold, barnyard grass, Japanese millet, foxtail grass, blackberry grass, sycamore, sorghum, oat, oat, Seiban sorghum,
Examples include weeds of the Poaceae family, such as grasshopper, grasshopper, and soybean grass; weeds of the Cyperaceae family, such as dayflower; and weeds of the Cyperaceae family, such as Cyperus japonica and Cyperaceae. Compound [ ] (U.S. Patent No. 4452981)
has herbicidal efficacy, and glyphosate [CR]
Wortning et al., eds., The Pesticide Manual, 7th edition,
Page 303 (1983) The British Crop
Published by Protection Council] is known as a herbicide. Although the mixing ratio of the compound [], which is an active ingredient of the composition of the present invention, and glyphosate can be varied within a relatively wide range, the amount of glyphosate is usually 0.5 to 50 parts by weight per 1 part by weight of the compound []. The amount is preferably 1 to 32 parts by weight. The chemical structural formulas of compound [] and glyphosate are shown in Table 1.

[Table] Examples of glyphosate salts include isopropylamine salts. When the composition of the present invention is used as a herbicide, it is usually mixed with a solid carrier, a liquid carrier, a surfactant, and other formulation auxiliaries, and formulated into an emulsion, wettable powder, suspension, or the like. These preparations contain active ingredients in a weight ratio of 1 to 90
%, preferably 2 to 80%. Examples of the solid carrier include fine powders or granules such as kaolin clay, attapalgite clay, bentonite, acid clay, pyrofluorite, talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide. Examples of liquid carriers include aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as isopropanol, ethylene glycol, and cellosolve, ketones such as acetone, cyclohexanone, and isophorone, vegetable oils such as soybean oil and cottonseed oil, dimethyl sulfoxide, Examples include acetonitrile and water. Surfactants used for emulsification, dispersion, wetting, etc. include anionic surfactants such as alkyl sulfate ester salts, alkylaryl sulfonates, dialkyl sulfosuccinates, and polyoxyethylene alkylaryl ether phosphate salts. agent,
Examples include nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block polymer, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester. Examples of formulation adjuvants include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymemelcellulose), and PAP (isopropyl acid phosphate). Examples of formulations are shown below. Note that parts indicate parts by weight. Formulation example 1 Compound [ ] 25 parts, glyphosate (free) 25
3 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 45 parts of synthetic hydrated silicon oxide
Thoroughly grind and mix the two parts to obtain a wettable powder. Formulation example 2 Compound [ ] 5 parts, glyphosate (free) 20
1 part, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC, and 69 parts of water were wet-milled until the particle size was 5 microns or less to obtain a suspension. The composition of the present invention prepared in this manner is applied to the foliage of weeds after they emerge. In addition to treating plants from above, foliar treatments include local treatments that treat only weeds so that they do not attach to crops. Furthermore, by treating the soil with the composition of the present invention, it is possible to control the growth of weeds after treatment, and furthermore, it does not cause problematic phytotoxicity to crops such as soybeans, cotton, corn, and wheat. Furthermore, by mixing it with other herbicides, it can be expected to increase the herbicidal efficacy. Furthermore, it can be used in combination with insecticides, acaricides, nematicides, fungicides, plant growth regulators, fertilizers, soil conditioners, and the like. The compound of the present invention can be used as an active ingredient of a herbicide for fields, fallow fields, orchards, pastures, lawns, forests, non-agricultural lands, and the like. Particularly in upland fields, it can be used in no-tillage farming in addition to the usual treatment methods. The application amount of the composition of the present invention is determined by the mixing ratio of the active ingredients,
The total amount of active ingredients per are is usually 1g to 50g, preferably 2g to 25g, although it varies depending on weather conditions, formulation form, type of target weed, etc. The agent is usually treated by diluting a predetermined amount of it with 1 to 10 liters of water per are (adding an auxiliary agent such as a spreading agent, if necessary). Examples of the spreading agent include, in addition to the above-mentioned surfactants, polyoxyethylene resin acid (ester), lignin sulfonate, abietate, dinaphthylmethane disulfonate, barafin, and the like. Next, a test example will be given to specifically demonstrate the herbicidal effect of the composition of the present invention. The herbicidal efficacy is expressed as the growth inhibition rate (%) calculated by the following formula by measuring the fresh weight of the above-ground parts of the test plants that remained dead at the time of the survey. Growth inhibition rate (%) = (1 - fresh weight of above-ground parts of test plants in treated area / fresh weight of above-ground parts of test plants in untreated area) × 100 Test example 1 Field soil foliage treatment test Area 33 x 23 cm ^3. A vat with a depth of 11 cm was filled with field soil, and tubers of Japanese muscaria and rhizomes of Seiban sorghum were transplanted and grown for 35 days. Thereafter, the sample was made into a wettable powder according to Formulation Example 1, and a predetermined amount of it was
It was diluted with water equivalent to 5 liters per are containing a spreading agent, and was uniformly treated from the top of the plant to the entire stem and leaf area using a small sprayer. At this time, the growth conditions of weeds and crops varied depending on the grass species, but they were in the 5-9 leaf stage and the plant height was 20-60 cm. Herbicidal efficacy was investigated 28 days after treatment. The results are shown in Table 2. This test was conducted in a greenhouse throughout the entire period.

[Table] The results in Table 2 are calculated using the iso-effect line method [Junichi Fukami, Yasuhiko Uesugi, Kozo Ishizuka, Chojiro Tomizawa, eds. "Agricultural Experimental Methods" vol. 3]
Volume Herbicides Edition, 1st Edition, pages 109-111 (1981, published by Soft Science)]. The results are shown in Figures 1-2. From the figure, it is clear that the composition of the present invention has a synergistic effect. Test example 2 Field soil treatment spectrum test Field soil was filled in a vat with an area of 33 x 23 cm ³ and a depth of 11 cm, and the fields were filled with field soil, and were treated with field soil, Japanese foxtail grass, red foxtail grass, red grass, common morning glory, Japanese grasshopper, yellowtail grass, American hornwort, American golden deer, Japanese dogwood,
Seeds of Japanese sorghum, sunflower, whiteberry, and sorghum were planted, and rhizomes of Seiban sorghum were transplanted and grown for 35 days. Thereafter, the sample was made into a hydrating powder according to Formulation Example 1, a predetermined amount of it was diluted with water equivalent to 5 liters per are including a spreading agent, and a small sprayer was applied from above the plant body to the whole surface of the stems and leaves. was uniformly processed. At this time, the growth conditions of weeds and crops varied depending on the grass species, but they were at the 3-8 leaf stage and the plant height was 5-60 cm. Herbicidal efficacy was investigated 28 days after treatment. The results are shown in Table 3. This test was conducted in a greenhouse throughout the entire period.

【table】

【table】 [Brief explanation of the drawing]

(1) The plot was drawn using the iso-effect line method based on the herbicidal efficacy against the Japanese commonweed in Table 2 in Figure 1 and Test Example 1. The vertical axis is the dose of glyphosate (free) (g/
a), the horizontal axis is the dose of compound [] (g/a)
respectively. Furthermore, the broken line represents the line of additive effect, and the solid line represents the line of equal effect with a growth inhibition rate of 70%. (2) Figure 2 was drawn using the isoeffect line method based on the herbicidal efficacy against Saban sorghum in Table 2 of Test Example 1. The vertical axis is the dose of glyphosate (free) (g/
a), the horizontal axis is the dose of compound [] (g/a)
respectively. Furthermore, the broken line represents the line of additive effect, and the solid line represents the line of equal effect with a growth inhibition rate of 70%.

Claims (1)

[Claims] 1 2-(4-chloro-2-fluoro-5-propargyloxyphenyl)-5,6,7,8-tetrahydro-1H-1,2,4-triazolo-
A herbicidal composition comprising (1,2-a)-pyritazine-1,3-2H-dione and N-(phosphonomethyl)glycine or a salt thereof as active ingredients.