JPS60116605A - Herbicidal composition for paddy rice - Google Patents

Abstract

PURPOSE:The titled composition, containing a dibenzylurea based compound and S-ethyl-perhydroazepine-1-carbothioate as active constituents, and having enhanced herbicidal effect and weeding spectrum by the synergistic action with reduced phytotoxicity. CONSTITUTION:A herbicidal compositon containing a compound of the formula (X is H or halogen; R<1> and R<2> are CH3 or C2H5) and S-ethyl-perhydroazepine-1- carbothioate at 1:0.5-5 weight ratio. The resultant composition has remarkably enhanced weeding spectrum and width of suitable application period by the very remarkable synergistic action of both components and is capable of suppressing the development of weeds almost completely throughout the growth period of paddy rice only by one treatment by mixing of such small amounts as not to control the weeds fully by the individual components without giving phytotoxicity to paddy rice.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (wherein, X is a hydrogen atom or a halogen atom, R1 and Ff
A dibenzyl urea compound (hereinafter referred to as compound A) represented by psIt + 1-dibenzyl urea compound (hereinafter referred to as compound A) and S-ethyl-perhydroazepine-1-carpothioate (hereinafter referred to as compound It's called B.

) as an active ingredient.

゛・1 The present invention has different herbicidal effects.2
By using Class S 6 herbicides in combination, each component exhibits effects that could not be obtained when used alone, increasing the herbicidal effect through extremely pronounced synergism, and expanding the grass spectrum. Furthermore, the aim is to reduce the amount used, thereby reducing drug damage and achieving economical effects.

In the present invention, Compound A has a high herbicidal effect against grass weeds and Cyperaceae weeds, has a long duration of efficacy (50 to 60 days), and has little phytotoxicity to paddy rice, but is less effective against broad-leaved weeds. It also has the disadvantage that although it acts strongly at the beginning of weed growth, its effectiveness decreases as the weeds grow.

In addition, Compound *B is highly effective against grass weeds such as Japanese grasshopper, and has a wide range of suitable periods for use, but it is also effective against other weeds,
In particular, it has the disadvantage that it is significantly less effective against broad-leaved weeds such as azalea and japonica, and annual or perennial weeds of the Cyperaceae family, such as bulrush and cyperus.

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 herbicidal spectrum and suitable period for use have been significantly expanded, and by mixing small amounts of each ingredient, which cannot be sufficiently controlled by each component alone, it can be used to treat not only annual weeds from the beginning of emergence to the growth period, but also perennial weeds. It has a very high control effect, and the duration of its effectiveness is also extremely long.One treatment can almost completely suppress the growth of weeds over the entire growing period of paddy rice. We discovered these excellent features and completed the present invention.

Exemplary compounds of the compound A represented by the general formula (1) are shown below.

1-benzyl-3-(α,α-dimethylbenzyl)urea (hereinafter referred to as compound A-1), 1-(°2-′fluorobenzyl)-3-(α-ethyl-α-methylbenzyl)urea (hereinafter referred to as compound A-2), 1-(2
-chlorobenzyl)-3-(,α゛,α-,α-diethylbenzyl, 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 ratio of active ingredients in the herbicide composition for paddy fields of the present invention can be varied over a wide range, it is preferable to mix compound A and compound B in a weight ratio of 1:0.5 to 5.

The herbicidal composition of the present invention is prepared by dissolving or dispersing the active ingredients Compound A and Compound B in a liquid carrier, or mixing them with a solid carrier, and then adding an emulsifier, a spreading agent, a dispersant, and a penetrating agent. It can be used in the form of granules, wettable powders, emulsions, etc. by adding auxiliary agents such as.

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 halogenated 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 and bentonite.

Mineral powders such as talc, 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 (polyoxyethylene alkyl allyl ether, polyoxyethylene octylphenyl ether, etc.), cationic surfactants (alkyldime, tilbenzylammonium chloride, alkylpyridinium chloride, etc.), anionic surfactants ( lignin (sodium sulfonate, dialkyl sulfosuccinate, etc.), amphoteric surfactants (alkyldimethylpentine, dodecylaminoethylglycine, etc.), and the like. One or more of these adjuvants may be used.

In addition, the herbicide composition of the present invention may be applied to i1! as necessary. !
It can also be used in combination with other insecticides, fungicides, herbicides, or plant growth regulators.

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 figures, parts indicate parts by weight.

Example 1 Granule compound A-16 parts, compound B 3 parts, bentonite 5
After mixing and pulverizing 8 parts of talc, 30 parts of talc, and 3 parts of dialkyl sulfosuccinate, an appropriate amount of water was added and kneaded.
Granules were obtained by granulation using a granulator in a conventional manner.

Example 2 Granule compound A-35 parts, compound B 5 parts, bentonite 6
0 parts of clay, 27 parts of clay, and 3 parts of sodium alkylbenzenesulfonate were mixed and ground, mixed with an appropriate amount of water, and granulated using a granulator in a conventional manner to obtain granules.

Example 3 Wettable powder compound A-420 parts, compound B 40 parts, diatomaceous earth
25 parts of talc, 10 parts of talc, and 5 parts of sodium alkylbenzenesulfonate were mixed and ground to prepare an irrigation agent.

Test example: Weeding effect and damage test Fill a 1/2000 are Wagner bonoto with paddy soil, mix seeds of Japanese millet, firefly, Japanese cypress, Japanese cypress, Japanese cypress, azalea, and Japanese chickweed into the soil surface layer, and add two tubers of Japanese cypress. After transplanting, two paddy rice plants at the two-leaf stage were transplanted.

The basic law is 3c+++.

Three days after transplanting paddy rice (weed initiation stage), 8 days (first leaf stage of Japanese millet), and 15 days (second leaf stage of Japanese millet), predetermined amounts of each chemical irrigation agent formulated according to Example 3 were poured. It was dropped onto the water surface.

Thirty days after the chemical treatment, the herbicidal effect and paddy rice damage were evaluated according to the criteria below, and the results are shown in Tables 1 to 3.

5 Complete control 4 80% control 3 60% control 2 40% control 1 20% control 0 No effect - Harmless ± slight scent 10 small books Medium Yoshisou Major harm procedure amendment February 7, 1980 Kazuo Wakasugi, Commissioner of the Patent Office Indication of Tono 1 case 1982 Patent Application No. 224023 3 Person making the amendment Postal code 100 (1) [1-benzyl-3-(α
, a-dimethylbenzyl)] is corrected to "1-<2-fluorobenzyl)-3-(a,a-dimethylbenzyl)".

Procedural amendment (method) % formula % 1. Name of the invention of Makigi Patent Application No. 2240231 of the case 4 stages / Fishing fish '7'rq-A'tZ()'y Paddy field removal agent ! Relationship with the ll1L thing & extraction person case Patent issuer Shira 1 Kousaku Wota "Fure I + Kii" Location: 1135, Marunouchi-2'41i1, Chiyoda-ku, Tokyo February 28, 2015 (shipment date) & Supplementary object clear m Lu Gua supplementary? 31! Specification 1 Jyo 1 (no earthquake disaster in the content)

Claims (1)

[Claims] General formula (wherein, X is a hydrogen atom or a halogen atom, R1 and R
1 represents a methyl group or an ethyl group. ) A herbicidal composition for paddy fields comprising a dibenzylurea compound represented by the following formula and S-ethyl-perhydroazepine-1-carbothioate as active ingredients.