JPH0662367B2 - Herbicidal composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides 2- (4-chloro-2-fluoro-5-n-
Pentyloxycarbonylmethoxyphenyl) -4,
5,6,7-Tetrahydro-2H-isoindole-
1,3-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 referred to as compound [II]). The present invention relates to a herbicidal composition (hereinafter, referred to as the composition of the present invention), which comprises and as an active ingredient.

Currently, many herbicides are used as herbicides for upland fields, but there are many types of weeds to be controlled, and the occurrence is long-term, so the herbicidal effect is higher, and the herbicide spectrum is wide. Moreover, safe herbicides are required for crops.

The present inventors have conducted various studies in order to develop a herbicide that meets such an object, and as a result, compound [I] and compound [I
I) and the composition of the present invention containing as an active ingredient, various weeds, particularly peanuts and a wide range of weeds in soybean fields can be selectively weeded, and their herbicidal efficacy is compared to when they are used alone. And increase synergistically,
The present invention has been completed by finding that it can be applied at a low dose and that the herbicidal spectrum is broadened.

The weeds that are the subject of the composition of the present invention include Enocorogusa, Mejiba, Echinochloa, sorghum, monocotyledonous plants such as sorghum, Shiroza, Aogatetou, Purslane,
Examples of morning glory, morning glory, morning glory, velvetleaf, red-billed morning glory, and other dicots such as red skeletons, American stag beetle, stag deer, dog physalis, and wild sunflower can be mentioned.

The composition of the present invention can simultaneously weed, especially weeds that are difficult to weed, such as white moss, stag deer, velvetleaf, blue-toothed pea, and physalis.

Compound [I] (see JP-A-58-110566)
Has a herbicidal effect, and compound [II] (JP-A-57-
No. 24364) is known as a herbicide.

The mixing ratio of the compound [I] and the compound [II], which are the active ingredients of the composition of the present invention, can be varied within a relatively wide range, but usually 1 part by weight of the compound [I] is added to the compound [II]. It is 0.2 to 50 parts by weight, preferably 0.5 to 20 parts by weight.

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

When the composition of the present invention is used as a herbicide, it is usually formulated into a emulsion, a wettable powder, a suspension, a granule or the like using a solid carrier, a liquid carrier, a surfactant and other formulation auxiliary agents.

These formulations contain the active ingredient in a weight ratio of 0.5 to 90.
%, Preferably 1 to 80%.

As a solid carrier, kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite,
Talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, fine powder or granules such as synthetic hydrous silicon oxide, the liquid carrier, xylene, aromatic hydrocarbons such as methylnaphthalene, isopropanol, ethylene glycol, Examples thereof include alcohols such as cellosolve, ketones such as acetone, cyclohexanone and isophorone, vegetable oils such as soybean oil and cottonseed oil, dimethyl sulfoxide, acetonitrile and water.

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

Formulation examples are shown below. Parts indicate parts by weight.

Formulation Example 1 10 parts of compound [I], 10 parts of compound [II], 10 parts of synthetic hydrous silicon oxide, 3 parts of alkylsulfate, 2 parts of calcium ligninsulfonate and 65 parts of diatomaceous earth are well pulverized and mixed to obtain a wettable powder. obtain.

Formulation Example 2 0.5 parts of compound [I], 1.5 parts of compound [II], 1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignin sulfonate,
After 30 parts of bentonite and 65 parts of kaolin clay are well kneaded, granulation and drying are performed to obtain granules.

Formulation Example 3 40 parts of compound [I], 40 parts of compound [II], 3 parts of calcium ligninsulfonate, 2 parts of sodium lauryl sulfate and 15 parts of synthetic hydrous silicon oxide are well pulverized and mixed to obtain a wettable powder.

These preparations are treated as they are or after being diluted with water or the like. In addition to the treatment from above the plant body, the foliage treatment includes local treatment in which only weeds are treated so as not to adhere to crops.

In addition, it can be expected to enhance the herbicidal effect by mixing with other weeds. Furthermore, it can be used by mixing with insecticides, acaricides, nematicides, fungicides, plant growth regulators, fertilizers, soil conditioners and the like.

The application rate of the composition of the present invention varies depending on weather conditions, soil conditions, formulation form of the composition, mixing ratio of active ingredients, target weeds and crops, etc., but the total amount of active ingredients per are is usually 0.5. It is about 10 g.

Emulsions, wettable powders, suspensions, etc. are applied after diluting a predetermined amount thereof with 1 to 10 liters of water per 1 are (adding a spraying aid such as a spreading agent if necessary). Granules, etc.
Usually, it is applied as it is without any dilution.

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 is indicated 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 survey.

Test Example 1 A bat having an area of 33 × 23 cm ² and a depth of 11 cm was filled with upland soil, and velvetleaf, white locust, dog physalis, blue-green agate,
American stag deer and soybean were sown and grown for 18 days. Then, the test sample was made into a wettable powder according to Formulation Example 1, a predetermined amount thereof was diluted with water containing a spreading agent, and a small sprayer was used to spray the foliage from above the plant body at a rate of 5 liters per arel. Sprayed evenly over the entire surface. At this time, the growth of each plant varied depending on the grass species, but was in the 1 to 4 leaf stage. Scatter 2
The herbicidal efficacy was investigated after 0 days. The results are shown in Table 2.

This test was conducted outdoors throughout the entire period.

Test Example 2 A plastic pot with a diameter of 11 cm and a depth of 8 cm was filled with upland soil, and velvetleaf, white locust, dog physalis, stag deer and soybean were sown and grown for 14 days. After that, the test sample was made into a wettable powder according to Formulation Example 1, a predetermined amount thereof was diluted with water containing a spreader, and 5 liters per 1 arel were sprayed from above the plant body with a small sprayer over the entire foliage. Evenly. At this time, the growth of each plant varied depending on the grass species, but was in the 1 to 3 leaf stage. The herbicidal efficacy was investigated 14 days after the application. The results are shown in Table 3. The test was conducted in a greenhouse throughout the entire period.

Test Example 3 A plastic pot having an area of 11 × 15 cm ² and a depth of 7 cm was filled with upland field soil, sowed with blue-green agate and cultivated for 21 days. Then, according to Formulation Example 1, the test sample was made into a wettable powder, a predetermined amount thereof was diluted with water, and 4 liters per 1 are were sprayed evenly over the entire foliage with a small sprayer from above the plant. Sprayed. At this time
The plant height was 5 cm at the 3-leaf stage. 22 days after spraying, the herbicidal efficacy was investigated. The results are shown in Table 4. The test was conducted outdoors throughout the entire period.

The results shown in Table 4 were analyzed by the iso-effect method (Agricultural Chemicals Experimental Method 3, herbicide, pages 109-116, Hideo Chisaka). The isoeffect method is a composition comprising different mixing ratios of compound [I] and compound [II]. For example, several combinations showing a growth inhibition rate of 90% were determined and shown in FIG. By plotting like this, synergistic effect, additive effect, and antagonistic effect can be easily determined.

When a synergistic effect is shown, the actual contour line is shown below the additive effect. In Test Example 3, as shown in FIG. 1, the isoeffect line that suppresses 90% of the admixture, Aogaeto, is located below the additive effect line, and this analysis method clearly has a synergistic effect. Was shown.

[Brief description of drawings]

Fig. 1 shows 90% of Aogatetow in Test Example 3.
The isoeffect line of growth suppression is shown. The solid line shows the additive effect, the dotted line shows the synergistic effect, the vertical axis shows the dose of compound [II] per are, and the horizontal axis shows the dose of compound [I] per are.

Claims (1)

[Claims] 1. 2- (4-chloro-2-fluoro-5-n
-Pentyloxycarbonylmethoxyphenyl) -4,
5,6,7-Tetrahydro-2H-isoindole-
Effective with 1,3-dione and 2- [4,5-dihydro-4-methyl-4- (1-methylethyl) -5-oxo-1H-imidazol-2-yl] -3-quinolinecarboxylic acid A herbicidal composition characterized by being contained as an ingredient.