JPS59101407A - Method for controlling weed - Google Patents

Abstract

PURPOSE:To control weeds in the field of e.g. corn, etc., by mixing the soil with a composition containing a thiol carbamate, and then treating the surface of the soil with a composition containing N-substituted-phenyl-3,4,5,6-tetrahydrophthalimide. CONSTITUTION:A herbicide composition containing S-ethyl-N,N-diisobutylthiol carbamate or S-ethyl-N,N-di-n-propylthiol carbamate or the above compounds added with N,N-dially-2,2-dichloroacetamide at a weight ratio of 12:1 (the component A) is mixed in the soil layer of the field, crops (e.g. corn) are planted to the field, and the surface of the soil is treated with a herbicide composition containing the compound of formula as active component to effect the complete control of especially broad-leaved weeds. The phytotoxicity to corns, etc. can be decreased by the above method. The preferable weight ratio of the component (A) to the compound of formula is (2-40) to 1.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to N-(4-chloro-2-fluoro-5-impropoxyphenyl)-8,4°5,6-titrahydrophthalimide (hereinafter referred to as the compound A herbicidal composition containing as an active ingredient S-ethyl-N,N-diisobutylthiol carbamate (hereinafter referred to as butyrate) or S-ethyl-N,N-di-n-furobylthiol carbamate (hereinafter referred to as butyrate). The present invention relates to a method for controlling weeds using a herbicidal composition containing N,N-diallyl-2,2-cycloa as N,N-diallyl-2,2-cycloa, or a herbicidal composition containing these thiol carbamates (hereinafter referred to as EPTC) or thiol carbamates.

Currently, many herbicides are used as herbicides for upland fields, but since there are many types of weeds to control and they occur over a long period of time, weed killers with higher herbicidal effects and a wider herbicidal spectrum are used. Additionally, there is a need for safe herbicides for crops.

The inventors of the present invention determined these points (as a result of intensive study),
Butyrate or EPTC, known as selective herbicides for crops such as corn, or these compounds (R-2, an antidote for corn)
5788 added at a mixing ratio of 12:l (1'he
1'esticide ManjAal 5ixth
Edition, P-71゜237.162 (19
±1 Il of herbicidal compositions containing as active ingredients (see 1979)
Compound [■] useful as a selective herbicide in corn fields after I2Jfi layer treatment and crop planting.
By treating the soil surface with a herbicidal composition containing as an active ingredient (see JP-A-57-168865), narrow-leaved weeds and broad-leaved weeds, especially broad-leaved weeds, can be sufficiently eliminated in areas where major crops, especially corn, are cultivated. It has been found that the control effect is synergistically increased compared to when these herbicidal compositions are used alone. In addition, if a large amount of a herbicidal composition containing Compound CI) as an active ingredient is used alone for the purpose of controlling harmful perennial weeds, corn may be damaged by chemicals, but the weeds according to the present invention may be They have also discovered that the method of controlling corn can reduce the medicinal content of corn, and have completed the present invention.

The ratio of the amounts of the respective active ingredients when using both herbicidal compositions according to the invention can be varied over a relatively wide range.

General 1-8 is a compound [I'' for 11 parts by weight of butyrate or EPTC or R-25 of these compounds.
788 added at a mixing ratio of 12:1 0.5-12
The amount is preferably 0 parts by weight, and more preferably 2 to 40 parts by weight.

As mentioned above, the method for controlling weeds according to the present invention has excellent herbicidal efficacy against many broad-leaved weeds and narrow-leaved weeds, and does not cause any harmful chemical damage to major crops. Targeted weeds include whiteweed, Japanese amberjack, Japanese knotweed,
Chickweed, purslane, Japanese fir tree, morning glory such as European morning glory, Japanese commonweed, and fulva morning glory, dicots such as American chestnut, American golden deer, Japanese broom, European bindweed, milkweed, dicots, foxtail grass, silver grass, silver grass, silver grass, White grass, barnyard grass, Seiban sorghum, sorghum, Cype
There are monocots such as rus esculentL.

When using the compounds related to the present invention as active ingredients of herbicides, usually solid carriers, liquid carriers, surfactants, and other formulation auxiliaries are used to prepare emulsions, wettable powders, suspensions, and grains. etc.

These preparations contain the compound of the present invention as an active ingredient in an amount of 1 to 95%, preferably 5 to 80%.

Solid carriers include fine powders or granules such as kaolin clay, attapulgite clay, bentonite, acid clay, pyrophyllite, talc, diatomaceous earth, calcite, walnut powder, urea, ammonium sulfate, and synthetic hydrous silicon oxide; liquid carriers 1. Aromatic hydrocarbons such as xylene and methylnaphthalene, alcohols such as i-nolobanol, 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, wet layer, etc. 1) Surfactants such as alkyl sulfate salts, alkyl (aryl) sulfonate salts, dialkyl sulfosuccinate salts, polyoxyethylene alkylaryl ether phosphate salts, etc. Examples include ionic surfactants, nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene polyoxypropylene block copolymer, sorbitan fatty acid ester, and 6-lyoxyethylene sorbitan fatty acid ester. Formulation adjuvants include lignin sulfonic acid layer,
alginate, hollyhinyl alcohol, gum arabic,
Examples include CMC (carboxymethyl cellulose) and PAP (isolopyl acid phosphate).

An example of this formulation is shown below. Note that parts indicate parts by weight.

Formulation Example 1 50 parts of compound CI'), 3 parts of calcium lignin sulfonate, 2 parts of sodium lauryl sulfate, and 45 parts of synthetic hydrous acid AE are thoroughly ground and combined to obtain a wettable powder.

Formulation Example 2 10 parts of phthylate, 14 parts of polyoxyethylene styrylphenyl ether, 6 parts of calcium dodecylbenzenesulfonate, and 70 parts of bixylene are thoroughly mixed to obtain an emulsion.

Formulation Example 3 2 parts of compound [■], 1 part of synthetic hydrous silicon oxide, 2 parts of calcium lignosulfonate, 30 parts of bentonite, and 65 parts of kaolin clay were thoroughly ground and mixed, water was added, and the mixture was thoroughly kneaded. Dry and repeat the granules to obtain granules.

Formulation Example 4 10 parts of EPTC-)-R-25788 (12:1), 14 parts of polyoxyethylene styrylphenyl ether, 6 parts of calcium dodecylbenzenesulfonate and 70 parts of xylene are thoroughly mixed to obtain an emulsion.

These preparations can be used as is or diluted with water to treat soil. Sara 1ko, insecticide, miteicide, nematocide,
It can also be used in combination with fungicides, plant growth regulators, fertilizers, soil conditioners, etc.

The combined application amount of each active ingredient of both herbicidal compositions in the present invention depends on differences in weather conditions, soil conditions, drug formulation, ratio of active ingredients in both compositions, target weeds and crops, etc. Although it cannot be generally specified, it is generally 12 to 80 degrees F per area, preferably 20 to 6 degrees V, and for emulsions, wetting agents, suspending agents, etc., per 1 area! 1J
It is applied by diluting it with 1 to 17 ttle of water, and the granules, etc., are not diluted in any way (apply as is).

Next, the herbicidal efficacy of the present invention will be specifically explained with reference to test examples.

The herbicidal efficacy was determined by measuring the fresh m-IN of the above-ground parts of the test plants that remained withered during the survey, and calculating the growth inhibition rate (%) using the following formula, and is expressed as a numerical value.

Test bloom example ■ A cylindrical plastic pot with a diameter of 10 cy and a depth of 1 o Crn was filled with field soil, sown with morning glory and covered with soil. The test compound (butyrate or EPTC or these compounds 1) was prepared by preparing 1 emulsion according to Formulation Example 21.
(Added with Ko-25788 at a mixing ratio of 12:1)
A predetermined amount of the solution was diluted with water and sprayed on the soil surface using a small sprayer at a rate of 1 01 J tutle per 1 are, and 8 ct of the surface layer of the soil was mixed. After mixing the soil, dilute the specified amount of Compound CI) prepared by straining the emulsion according to Example 21 with water, and spray it on the soil surface using a small sprayer at a rate of 10 liters per 1 area. did. Thereafter, the plants were grown in a greenhouse for 20 days, and the herbicidal efficacy was increased to 1lffif. The results are shown in Table 1.

The herbicidal efficacy values in Table 1 were calculated as the growth inhibition rate (%) in comparison with the fresh weight of the untreated area.

Untreated area natural nail test example 2 A cylindrical 4-tube stick pot with a diameter of 1 Om and a depth of 10 crm was filled with field soil, and the test compound (butyrate 1 x R-25788, which was made into an emulsion according to Formulation Example 2) :1
(added at a mixing ratio of 11) with water,
゛ Sprayed on the soil surface with a small sprayer at a rate of 10 liters per area, and mixed 3 crn of the surface layer of the soil. After the soil was mixed, the corn was soaked to a depth of 1.5 cm, and a predetermined amount of Compound CI), which had been prepared by straining 1 part of the emulsion in Preparation Example 2I, was retranslated with water, and 10 liters of corn was added per 1 area. Spray it on the soil surface once with a small sprayer. Thereafter, the corn was grown outdoors for 20 days, and phytotoxicity per corn was investigated.

The results are shown in Table 2.

Table 2: Plant damage to corn: 0 (harmless) to 5 (complete withering) /'' Test Example 3 A vat with an area of 38 x 28 d and a depth of 1 liter (filled with upland soil, and the test compound made into an emulsion according to Formulation Example 21) Dilute a specified amount of 1 quart of butyrate (-25788 added at a mixing ratio of 12:1) with water, and
It was sprayed on the soil surface using a small blower at the rate of 01J Tutle spraying, and the soil surface layer 4Crn was mixed in. Top * After mixing, seeds of crabgrass, foxtail grass, Seiban sorghum, Japanese corn, and corn were sown at a height of 1 to 2 cm, and a predetermined amount of the compound [■] made into an emulsion according to Formulation Example 2 was diluted with water, and 1 are It was applied to the soil surface using a small sprayer at a rate of 10 liters per application. Thereafter, the plants were grown outdoors for 20 days, and the weeding power and chemical damage were measured. The results are shown in Table 8. In addition, the numerical value of the herbicidal efficacy against weeds is based on Test Example 1.

Claims (1)

[Claims] to S-ethyl-N,N-diisobutylthiol carbamate or S-ethyl-N,N-di-n-propylthiol carbamate or these thiol carbamates. A herbicidal composition with an N content is mixed in the soil, and then N-(4-chloro-2-fluoro-5-impropoxyphenyl)-8,4,5,6-titrahydrophthalimide is added as an active ingredient.