JPS5839126B2 - Herbicidal composition - Google Patents

Description

Detailed Description of the Invention The present invention is based on the general formula (wherein R and R' are lower alkyl groups, or R1R'
represents a group that forms a heterocycle with the N atom.

X represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or an alkylthio group.

n represents 1 or 2.

The present invention relates to a herbicidal composition containing a mixture of a thiol carbamate compound shown in ) and methyl-3-(m-)1)carbamoyloxy)phenyl carbamate as an active ingredient.

The thiol carbamate compounds used in the present invention have a strong ability to inhibit the germination of weed seeds, and are particularly effective against weeds of the true family, but are not sufficiently effective against broad-leaved weeds.

For green leaf weeds and other broad-leaved weeds, it is necessary to use a dose 5 to 8 times the amount to adequately control the regular weeds.

In addition, they tend not to be effective against weeds of the regular family or weeds that have advanced in growth.

On the other hand, methyl-3-(m-)I-fulcarbamoyloxy)phenylcarbamate (hereinafter referred to as betanal) has a strong effect of killing weeds during the growing season, and is particularly effective against broad-leaved weeds, but it It has a weak germination inhibiting power, and is not sufficiently effective against common weeds such as field weed, crabgrass, and foxtail.

In order to completely kill all types of arable weeds with these compounds, large amounts of chemicals are required, and it is difficult to completely control weeds without causing chemical damage to useful crops.

In addition, when this compound is used alone, its weedicidal effect and safety on useful crops may vary depending on environmental changes, and depending on the environment, it may not reach the intended weedicidal efficacy or may cause unexpected chemical damage. There is also.

The present inventor has discovered that when the thiol carbamate compound is used in combination with betanal, the synergistic action of the two can easily completely kill weeds without causing any phytotoxicity to useful crops, and furthermore, it is possible to reduce the environmental impact. We have completed the present invention by discovering that the herbicidal effect varies little due to changes.

※※ The herbicidal composition of the present invention selectively controls only weeds without causing chemical damage to useful crops, and can be used in cultivation fields such as direct-seeded cultivation, transplanted cultivation of paddy rice, and sugar beet.

It is possible to control wild grasses, grasshopper, foxtail grass, blueberry, knotweed, etc.

Examples of the thiol carbamate compounds used in the present invention include the following.

The mixing ratio of these thiol carbamate compounds and betanal is 1 to 4 to 2 degrees, and particularly preferably 8 to 16 degrees.

The amount used per 10 ares is preferably 100 to 4001.

Various forms of the drug, including the two types of compounds, can be used in the practice of this invention.

For example, it can be used in powders, granules, wettable powders, emulsions, etc. Wettable powders and emulsions are used after being diluted with water to an appropriate concentration.

Each of these forms of the drug contains the active ingredient of the present invention in a suitable carrier,
It is prepared by conventional methods from other adjuvants.

Below are some examples of drug prescriptions.

Note that parts indicate parts by weight.

Example 1 Powder S-2.4 parts of 5-dimethylbenzyl N-N-dimethylthiol carbamate was adsorbed on 5 parts of white carbon, and 0.5 parts of betanal, 50.5 parts of Merck, and 40 parts of clay were mixed therein. Grind into powder.

Example 2 Wettable powder 15 parts of 5-(4-chlorobenzyl)N-N-diethylthiol carbamate, 1 part of betanal, 10 parts of white carbon, 2 parts of sodium alkylbenzenesulfonate, 3 parts of sodium ligninsulfonate, 69 parts of diatomaceous earth Mix and grind well and use as a hydrating agent.

The main rule is to suspend it in water and use it as a spray liquid.

Example 3 Emulsion 20 parts of 5-4-chlorobenzyl N-N-hexamethylenethiol carbamate, 5 parts of betanal, 5 parts of polyoxyethylene alkyl allyl ether, 5 parts of alkylaryl sulfonate, 15 parts of methanol, 10 parts of isophorone, xylene Mix 40 parts well to form an emulsion.

The basic rule is to dilute it with water and use it as a milk suspension. Next, in order to clarify the features of the present invention, test results will be shown when each compound is used alone and when both are used in combination.

Test example 1 Medicinal efficacy and phytotoxicity test 100 in pre-germination treatment by mixed treatment
Fill a 0Cd pot with upland soil, sow 20 grains of fir, and add a certain amount of soil mixed with seeds of crabgrass, field weed, and broad-leaved weeds (knotweed, blueberry, pigweed, etc.) at a rate of 0.5~ After covering the soil to a depth of 1.0 crft, a predetermined amount of the emulsion having each mixing ratio was diluted with 100 parts water per 10 a and sprayed.

The treated bats were kept in a greenhouse at 20-25°C.

The moisture conditions in each treatment area were similar to that of a field, and water was applied as appropriate to prevent excessive dryness.

The investigation was conducted one month after treatment to investigate the effects on each weed and the chemical damage to rice.

Efficacy and drug damage were evaluated according to the following criteria.

Efficacy and phytotoxicity index IO blight 990% or more and less than 100% herbicidal effect (phytotoxicity) 880
〃 90 〃 (〃) 70% or more 8 60 〃 7 50 〃 6 40 〃 5 30 〃 4 20 〃 3 More than 0%2 Herbicidal effect less than 0% (phytotoxicity) 0 〃 (〃) O〃 (〃) O〃 (〃) O〃 (〃) 0 〃 (〃) Q // (〃) 〃 (open) Test Examples 2 to 4 were also evaluated according to this standard.

The test results are shown in Table 1.

Test Example 2 Medicinal efficacy and phytotoxicity test in pre-germination treatment by mixed treatment Fill a 1000criL honeycomb with field soil, sow 20 sugar beet seeds, and add a certain amount of seeds of crabgrass, wild grass, and broadleaf (knotweed, blueberry, pigweed, etc.) After covering the soil with a certain amount of mixed soil to a depth of 0.5 to 1.0 CIrL for seeding, a predetermined amount of the emulsion having each mixing ratio was diluted with 100 parts water per 10 a and sprayed.

The treated bats were kept in a greenhouse at 20-25°C.

The moisture conditions in each treatment area were similar to that of a field, and water was applied as appropriate to prevent excessive dryness.

The investigation was conducted one month after the treatment to investigate the effects on each weed and the chemical damage to sugar beets.

The test results are shown in Table 2.

Test Example 3 Test for medicinal effects in growing season treatment using mixed treatment. Three- to four-leaf stage wild grasses, crabgrass, broad-leaved weeds (such as polygonum, pigweed, and green grass), and rice grown in 1000 crA polybuttons filled with upland soil were provided. As a trial, a predetermined amount of emulsion having each blending ratio was diluted with 100 parts water per 10a and sprayed.

The treated bats were kept in a greenhouse at 20-25°C.

The moisture conditions in each treatment area were similar to that of a field, and water was applied as appropriate to prevent excessive dryness.

The investigation was conducted one month after treatment to investigate the effects on each weed and the chemical damage to rice.

The test results are shown in Table 3.

Test Example 4 Test for medicinal effects and phytotoxicity in growing season treatment using mixed treatment. Three- to four-leaf stage wild grasses, crabgrass, broad-leaved weeds (such as knotweed, pigweed, and green grass) and sugar beet grown in 1000c4 polybags filled with upland soil were provided. As a trial, a predetermined amount of emulsion having each blending ratio was diluted with 100 parts water per 10a and sprayed.

The treated bats were kept in a greenhouse at 20-25°C.

The moisture conditions in each treatment area were similar to those of a field, and water was applied as appropriate to prevent excessive drying.

The investigation was conducted one month after the treatment to investigate the effects on each weed and the chemical damage to sugar beets.

The test results are shown in Table 4.

Claims (1)

[Claims] General formula 1 (wherein R, R' are lower alkyl groups, or R1R'
represents a group that forms a heterocycle with the N atom. X represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or an alkylthio group. n represents 1 or 2. 1. A herbicidal composition comprising a mixture of a thiol carbamate compound shown in ) and methyl-3-(m-)IJ flucarbamoyloxyphenyl carbamate as an active ingredient.