JPH01265002A - Herbicidal composition - Google Patents

Abstract

PURPOSE:To provide a herbicide containing 2-[7-fluoro-3,4-dihydro-3-oxo-4-(2- propynyl)-2H-1,4-benzoxa-zin-6-yl]-4,5,6,7-tetrahydro-1H-isoindole-1,3 (2H)-dione and imazaquin. CONSTITUTION:The herbicide contains the compound of formula and 2-[4,5- dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-l-2-yl]-3-quinoli necarboxylic acid (imazaquin) at a weight ratio of 1:1-20. The compounds are mixed with a solid carrier, a liquid carrier, a surfactant and other adjuvant for herbicide and formed in the form of emulsifiable concentrate, wettable powder, suspension, granule, etc. The herbicide is especially effective in selectively killing a wide variety of weeds in soybean field. The herbicidal effect is synergistically increased compared with the case of separate use of each component and, accordingly, the herbicide is effective at a low rate of application. The ratio of the active component in the herbicide composition is 1-80wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION 2-[7-fluoro-3,4-dihydro-3
-oxo-4-(2-provinyl)-2H-1,4-benzoxazin-6-yl) -4,5,6,7-titrahydro l:l! -1H-isoindole-1,3(2H
)-dione (hereinafter referred to as compound (1)) and 2-(
4゜5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-
3-quinolinecarboxylic acid (hereinafter referred to as imazaquin)
The present invention relates to 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 in use.
Since there are many types of weeds that need to be controlled, and their emergence takes a long time, there is a need for herbicides that are highly effective, have a broad herbicidal spectrum, and are safe for crops.

The present inventors conducted various studies to develop a herbicide that meets these objectives, and found that the composition of the present invention containing compound (1) and imazaquin as active ingredients was effective against various weeds,
In particular, it can selectively weed a wide range of weeds in soybean fields, and its herbicidal efficacy increases synergistically compared to when they are used alone, and they can be applied at low dosages, further expanding the herbicidal spectrum. They discovered this and completed the present invention.

The composition of the present invention can be applied to the main weeds of soybean fields, such as freckle currant, Japanese knotweed, American cornflower, purslane, whitewort, Japanese sagebrush, Japanese sagebrush, American hornwort, Ebisugusa, Japanese thorn, American golden deer, American morning glory, Malva morning glory, Malva morning glory. Dicotyledonous plants, such as Physalis, Helianthus japonicum, Japanese Physalis, Japanese fir, Sunflower, Convolvulus, Euphorbi, Helicoptera, and Pigweed, and monocotyledonous plants such as Golden millet, Foxtail grass, Golden foxtail grass, Golden foxtail, Helicoptera, Physalis, Seiban sorghum, Zebra wheat, Shatter cane, etc. Effectively weed plants,
It does not cause any harmful chemical damage to the dice crop.

The fact that the compound (13) has herbicidal activity is disclosed in U.S. Patent No. 46.
40707, and imazaquin is described in Farm Chemicals) 1 and book.
'86 (Meister Publishing C
It is a well-known herbicide described on page C207 (Published by J.O., 1986).

The mixing ratio of the compound ([), which is an active ingredient of the composition of the present invention, and imazaquin can be varied over a relatively wide range, but usually 0.5 to 1 part of imazaquin is mixed with 1 part by weight of the compound (13). 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 formulation auxiliaries to formulate an emulsion, a wettable powder, a suspension, a granule, and the like.

Examples of solid carriers include fine powders or granules such as kaolin clay, antabulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut shell 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 a7ton, cyclohexanone, and isophorone;
Examples include valuable oils such as soybean oil and cottonseed oil, N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, and water.

Examples of surfactants include anionic interfaces such as alkyl sulfate salts, alkylaryl sulfonates, dialkyl sulfosuccinates, and polyoxyethylene alkylaryl ether phosphate salts used for emulsification, dispersion, wet spreading, etc. activator, polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether,
Examples include nonionic surfactants such as polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, and polyoxyethylene sorbitan fatty acid ester.

Other formulation adjuvants include lignin sulfonate, alginate, polyvinyl alcohol, gum arabic, CMC (carboxymethyl cellulose), PAP (a
isopropyl phosphate), etc.

These preparations contain active ingredients of 0.5 to 90% by weight;
Preferably it is contained in an amount of 1 to 80%.

Next, formulation examples are shown. In addition, parts represent parts by weight.

Formulation Example 1 135 parts of the compound, 40 parts of imazaquin, 3 parts of calcium lignosulfonate, 2 parts of sodium lauryl sulfate, and ηO parts of synthetic hydrous silicon oxide are thoroughly ground and mixed to obtain a wettable powder.

Formulation Example 2 131 parts of the compound, 20 parts of imazaquin, 3 parts of polyoxyethylene sorbitan monooleate, 3 parts of CMC and 73 parts of water are mixed and wet-pulverized until the particle size becomes 5 microns or less to obtain a suspension.

Formulation Example 3 Compound [! ] 1 part, imazaquin, 4 parts, synthetic hydrated silicon oxide, 1 part, calcium lignin sulfonate, 2 parts, hentonite, 30 parts, and 62 parts of kaolin clay were thoroughly pulverized and mixed, and after adding water and kneading well, the mixture was granulated and dried. to obtain granules.

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

Although the appropriate application amount of the composition of the present invention cannot be determined unconditionally due to differences in weather conditions, soil conditions, drug formulations, types and mixing ratios of active ingredients, etc., the total amount of active ingredients per hectare is 50-600g preferably 100-300g
It is g.

Emulsions, wettable powders, suspensions, etc. are usually applied by diluting the specified amount with 100 to 1000 N of water per hectare.
Granules etc. are usually applied as is without any dilution.

The composition of the present invention can be expected to enhance herbicidal efficacy by being mixed with other herbicides, and can also be used in combination with insecticides, fungicides, plant growth regulators, fertilizers, soil conditioners, etc. .

Next, the effects of the composition of the present invention will be specifically illustrated by giving test examples.

In addition, the herbicidal efficacy was determined by measuring the fresh weight of the above-ground parts of the test plants that remained withered at the time of the survey, and calculated the growth inhibition rate (%) using the following formula.
Indicated by

Growth suppression rate (%) = Test Example 1 Pack field soil into a pad with an area of 17 x 24 cm and a depth of 7 cm, and use it to incubate Daisu, Ichibi, Morning Glory, Japanese fir, Ebisugusa, Japanese Physalis, Elephant grass, Seiban Sorghum, and Japanese Sorghum! Seeds were planted and covered with soil to a thickness of 1 to 2 cm. A predetermined amount of the drug made into a wettable powder according to Formulation Example 1 was diluted with water equivalent to 10 liters per are, and sprayed onto the soil surface using a small sprayer. After treatment, the plants were grown in a greenhouse for 20 days and their herbicidal effects were investigated.

The results are shown in Table 1.

Test Example 2 A vat with an area of 10 x 16 cffl and a depth of 6 cm was filled with upland soil, and the morning glory was grown! [Soil was covered to a thickness of L1-2cI11. 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 onto the soil surface using a small sprayer. After processing, 2
The plants were grown outdoors for 0 days and their weeding effects were investigated.

The results are shown in Table 2.

Table 2 The results in Table 2 are summarized using the equal effect line method [Fukami order - 1 Yasuhiko Uesugi, Kozo Ishizuka, Choji Tomizawa (eds.), Pesticide Experimental Methods Volume 3 Herbicides 1st edition 109-111 (1981) (Refer to published by Soft Science). The results are shown in Figure 1.

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

[Brief explanation of the drawing]

FIG. 1 is a diagram drawn by the iso-effect line method based on the herbicidal effect on Asagao morning glory in Table 2 of Test Example 2. The vertical axis represents the drug 1 (g/ha) of compound [I], and the horizontal axis represents the drug ffi (g/ha) of imazaquin. The dotted line indicates the additive effect with a growth inhibition rate of 80%, and the actual growth The iso-effect line with an inhibition rate of 80% is shown as a solid line. Figure 1 Amount of active ingredient in imazaquin (g/ha)

Claims (1)

[Claims] 2-[7-fluoro-3,4-dihydro-3-oxo-
4-(2-provinyl)-2H-1,4-benzoxazin-6-yl]-4,5,6,7-tetrahydro-1
H-isoindole-1,3(2H)-dione and 2-[
4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-
A herbicidal composition containing 3-quinolinecarboxylic acid as an active ingredient.