JPS60152402A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE:The titled composition having long effect free from phytotoxicity, obtained by using both a dibenzylurea compound effective against gramineous weeds and cyperaceous weeds ethyl N-chloroacetyl-N-(2,6-diethylphenyl)glycinate. CONSTITUTION:A herbicide composition for paddy field obtained by blending a dibenzylurea compound [e.g., 1-benzyl-3-(alpha,alpha-dimethylbenzyl)urea, etc.] shown by the formula (X is H, or halogen: R<1> and R<2> are methyl, or ethyl) with ethyl N- chloroacetyl-N-(2,6-diethylphenyl)glycianate in a weight ratio of 1:0.2-1. The composition has extremely enlarged herbicidal spectrum and application width by excellent synergistic action, extremely long duration time of effect, controls almost perfectly occurrence of weeds over the whole growth period of paddy rice plants by one treatment, and has no phytotoxicity to paddy rice plants.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a nopendylurea compound (hereinafter referred to as This invention relates to a herbicide silk composition for use in water E, which contains toethyl N-chloroacetyl-N-(2,6-diethylphenyl)gly7ate (hereinafter referred to as compound B) as an active ingredient.

The present invention uses two types of herbicides, each with a different herbicidal effect, to achieve an effect that could not be obtained when each component was used alone, and to increase the herbicidal effect through an extremely significant synergistic effect. The aim is to expand the use of herbicidal Suictor and reduce the amount of Sarak used to reduce drug damage and reduce economic effects.

In the present invention, Compound A has a high herbicidal effect on Poaceae and Cyperus weeds, has a long duration of efficacy (50 to 60 days), and has little toxicity to paddy rice, but is less effective against broad-leaved weeds. In addition, it acts strongly at the beginning of weed growth, but it has a negative effect on the growth of weeds and reduces the number of people who need it.

In addition, Compound B is highly effective against annual grass weeds such as Japanese millet, but is less effective against perennial cyperaceous weeds such as bulrush and cyperus, and is also less effective against annual broad-leaved weeds. It has its drawbacks.

The present inventors have discovered that when Compound A and Compound B, each of which has the above-mentioned drawbacks, are mixed and used in an appropriate ratio, the drawbacks of using each component alone can be compensated for, and an extremely significant synergistic effect can be produced. The four herbicides and the range of suitable periods for use have been significantly expanded, and by mixing small doses of each ingredient alone, it is effective against not only annual weeds from the beginning of emergence to the growth period, but also perennial weeds. It has a very high pesticidal effect, and has an extremely long duration of efficacy, and has the advantage of almost completely suppressing weed growth over the entire growing period of paddy rice with a single treatment, and not causing any chemical damage to paddy rice. As a result, the present invention was completed.

Exemplary compound 1- for the compound represented by the above general formula (1)
Benzyl-3-(α,α-dimethylbenzyl)urea (hereinafter referred to as compound A-1), ■-(2-fluorobenzyl)-3-(α-ethyl-α-methylbenzyl)urea (hereinafter referred to as compound ), 1-(2-chlorobenzyl)-3-(α,α-diethylbenzyl)urea (hereinafter referred to as compound A-3), 1-(2-bromobenzyl)=3-( α-ethyl-α-methylbenzyl)urea (
(hereinafter referred to as compound A-4).

Among the above compounds, Compound A-2, Compound A-3 and Compound A-4 are new compounds related to Japanese Patent Application No. 57-150547.

Although the blending ratio of the active ingredients in the herbicide composition for paddy fields of the present invention can be applied over a wide range, it is preferable to blend Compound A and Compound B in a weight ratio of 02 to 1.

The herbicide composition of the present invention contains compound A as an active ingredient and compound 2 as an active ingredient.
Compound B is dissolved or dispersed in a liquid carrier, or mixed with a solid carrier, and further added with an emulsifier, a spreading agent, a dispersant,
It can be used in the form of granules, wettable powders, emulsions, etc. by adding adjuvants such as penetrants.

Liquid carriers include alcohols such as methyl alcohol and ethyl alcohol, ketones such as acetone and methyl ethyl ketone, ethers such as dioxane and methyl cellosolve, aromatic hydrocarbons such as benzene and xylene, carbon tetrachloride, methylene chloride, etc. Suitable are logated hydrocarbons, acid amides such as dimethylformamide, and esters such as ethyl acetate, and one or more of these may be used.

Solid carriers include kaolin, bentonite, talc,
Mineral powders such as calcium carbonate and clay, and vegetable powders such as starch are suitable, and one or more of these may be used.

Auxiliary agents include various types of surfactants. For example, nonionic surfactants (prioxyethylene alkyl allyl ether, polyoxyethylene octylphenyl ether, etc.), cationic surfactants (alkylzmethylbenzylammonium chloride, alkylpyridinium chloride, etc.), anionic surfactants ( sodium lignin sulfonate, dialkyl sulfosuccinate, etc.), amphoteric surfactants (alkylaminomethylpetaine, dodecylaminoethylglycine, etc.), and the like. These adjuvants may be used alone or in amounts of 2 fiJ or more.

Furthermore, the herbicidal composition of the present invention can be used in combination with other insecticides, fungicides, herbicides, or mulberry growth regulators, if necessary.

Next, the herbicidal composition of the present invention will be explained by giving examples, but the present invention is not limited to these. In the example, the part indicates the # place part.

Example 1 Granules: 17 parts of compound A, 5 parts of compound B, 58 parts of bentonite, 27 parts of talc and dialkyl sulfosuccinate were mixed and kneaded, and the mixture was granulated using a granulator in a conventional manner.
Granules were obtained.

Example 2 Granules: 35 parts of Compound A, 5 parts of Compound B, 60 parts of bentonite, 27 parts of clay and 3 parts of sodium alkylbenzenesulfonate were mixed and pulverized, an appropriate amount of water was added and kneaded, and the mixture was prepared using a granulator. Granules were obtained by granulation according to the method described above.

Example 3 Wettable powder compound A-430 parts, compound 830 parts, diatomaceous matter 25
part, 10 parts of talc and alkylbenzenesulfonic acid)
5 parts of IJum were mixed and ground to obtain a wettable powder.

Test example: Herbicidal effect and phytotoxicity test A 1/2000 are Wagnerbot was filled with paddy soil, and seeds of Japanese millet, firefly, Tamagayari, Konagi, Kikashigusa, azalea, and Japanese chickweed were mixed into the surface layer of the soil. Two rice plants were transplanted, and two paddy rice plants at the two-leaf stage were also transplanted.

In addition, the flooding depth was set to 3c1n.

3 days before transplanting paddy rice (before the emergence of weeds), 3 days after (beginning of weed emergence), 8 days after (first leaf stage of Japanese millet), and 15 days after transplanting paddy rice.
After a few days (at the second leaf stage of Japanese millet), a predetermined amount of an aquarium of each drug prepared according to Supplementary Example 3 was dropped onto the flooded surface.

Thirty days after the chemical treatment, the herbicidal effect and paddy rice damage were evaluated according to the following criteria, and the results are shown in Tables 1 to 4.

Evaluation 11μ Weeding effect 5 Complete control 4 80 control 3 60 bite control 2 40 tsumu control 1 20 control 0 Effective turnip (2) Evaluation value Paddy rice chemical damage - Harmless ± Toyo + Koshotan Used 10 + 10 Large Harm procedure amendment (Method) May 9, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case: Patent Application No. 8556 of 1983 2. Name of the invention 3. Postal code of the person making the amendment: 100 Telephone number: 03 (281) 5021 8-・
4. Date of amendment order April 24, 1980 (shipment date) 5. Statement of effect of amendment 6. Cleaning of statement of contents of amendment (no change in content) Procedural amendment 1975 'iIl□ Mr. Kazuo Wakasugi, Commissioner of the Japanese Patent Office 1 Display of the case 1982 Patent Application No. 8556 2 Name of the invention Mizuguchi] Herbicidal composition 3 Relationship with the person making the amendment Patent applicant postal code 105 Telephone number -03(457)1335 Date of 4th amendment order -d' Contents of 6th amendment in "Detailed explanation of the invention" of the month-end specification of 5th amendment Attached to the procedural amendment submitted on May 9, 1988 Correct the statement as follows:

(1) Page 4 of the specification, lines 2 to 3, “1-henshiny-
3-(a,a-dimethylbenzyl)urea" rl
-(2-fluorobenzyl)-3-(α,a-trimethylbenzyl)urea].

Claims (1)

[Claims] A dibensol urea thread compound represented by the general formula (wherein, X is a hydrogen atom or a halogen atom, and R1 and R are a methyl group or an ethyl group) and ethyl N-chloroE A herbicide composition for paddy fields containing '7-1=chill-N-(2,6-diethylphenyl)gly7nate as an active ingredient.