JPS60116611A - Herbicidal composition for paddy field - Google Patents

Abstract

PURPOSE:The titled composition, containing three components of a specific dibenzylurea based compound and 2-(2-naphthyloxy)propionanilide, etc., and having remarkably enhanced weeding spectrum and width of suitable application period and a long duration. CONSTITUTION:A herbicidal composition containing (A) a compound of the formula (X is H or halogen; R<1> and R<2> are CH3 or C2H5) capable of exhibiting improved herbicidal effect on weeds of the families Gramineae and Cyperaceae with a long duration but weak effect on broad-leaved weeds and reducing the effect thereof with advance in growth, (B) 2-chloro-2',6'-diethyl-N-propoxyethylacetanilide having high herbicidal effect on annual weeds of the family Gramineae such as barnyard grass, etc. but exhibiting phytotoxicity to young seedlings of paddy rice and (C) 2-(2-naphthyloxy)propionanilide having relatively high effect on perennial broad-leaved weeds mainly Japanese ribbon wapato but very low effect on weeds of the family Gramineae at 1:0.2-2:1-10 weight ratio of (A):(B):(C).

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 R
2 represents a methyl group or an ethyl group. ) (hereinafter referred to as compound A), 2
-Chloro-2', 6'-diethyl-N-propoxyethylacetanilide (hereinafter referred to as compound B) and 2
-(2-naphthyloxy)propionanilide (hereinafter referred to as
It is called compound C. ) as an active ingredient.

The present invention uses 3s type unveiling agents, each having a different unveiling effect, to produce effects that could not be obtained when each component is used alone, and to increase the unveiling effect through a very significant synergistic effect. The aim is to expand the insecticidal spectrum and further reduce the amount used to reduce drug damage and achieve economic effects.

In the present invention, Compound A has a high herbicidal effect on Poaceae and Cyperaceae, has a long duration of efficacy (50 to 60 days), and has little phytotoxicity to paddy rice, but is not effective against broad-leaved weeds. It has the disadvantage that it is weak and acts strongly at the beginning of weed growth, but its effectiveness decreases as the weeds grow.

Compound B has a high effect on 1-year-old rice plants such as Japanese grasshopper and other rice plants, but it cannot avoid chemical damage to paddy rice seedlings when used in practical amounts, and therefore, if the amount used is reduced, it may be harmful to 1-year-old rice plants such as firefly and cypress. Another disadvantage is that the effect against perennial Cyperaceae weeds is insufficient, and the duration of the effect is relatively short, so that recovery of the Cyperaceae weeds is observed.

Compound C has a relatively high herbicidal effect on perennial broad-leaved weeds, mainly grasshoppers, but has a very low herbicidal effect on grass weeds. In addition, if used before or after rice planting, it will cause chemical damage, so it has the disadvantage that the range of appropriate use is extremely narrow.

In addition, when compound B and compound C are used in combination, the herbicidal effect is high against grass weeds and weeds, but it is effective against annual weeds such as firefly and cyperus, or perennial weeds of the cyperaceae family. It has disadvantages such as low weeding effect and short duration of effect for all types except grass weeds.

The present inventors have discovered that by mixing Compound A, Compound B, and Compound C, each of which has the drawbacks described above, in an appropriate ratio, not only can the drawbacks of using each component alone be compensated for, but also a very significant synergistic effect can be produced. The insecticidal spectrum and suitable period of use have been significantly expanded, and by mixing small amounts of each ingredient, which cannot be sufficiently controlled by each ingredient alone, it can be used against perennial weeds as well as weeds from the beginning of emergence to the growth period. It has a high pesticidal effect against insects, and the duration of its effectiveness is also extremely long.
The present inventors have discovered excellent characteristics such as almost completely suppressing the growth of weeds over the entire growing period of paddy rice with only one treatment and no phytotoxicity to paddy rice, leading to the completion of 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-a-=methylbenzyl)urea ( (hereinafter referred to as compound A-2), 1-(2-chlorobenzyl)-3-(α,α-diethylbenzyl)urea (hereinafter referred to as compound A-3), 1-(2-bromobenzyl)- 3-(α-ethyl-d-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 of the herbicide composition for paddy fields of the present invention can be applied over a wide range, compound A, compound B, and compound C
It is preferable to mix them in a weight ratio T1:0.2-2:1-10.

The herbicide composition of the present invention dissolves or disperses active ingredients Compound A, Compound B, and Compound C in a liquid carrier,
Or mixed with a solid carrier and further added with an emulsifier, a spreading agent,
By adding auxiliary agents such as dispersants and penetrants, granules, irrigation agents,
It can be formulated and used in the form of an emulsion.

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 dimethylformamitom, 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 these 114
J or two or more types are used.

Various types of surfactants can be used as adjuvants. For example, nonionic surfactants (polyoxyethylene alkyl allyl ether, polyoxyethylene octylphenyl ether, etc.), cationic surfactants (alkyl dimethyl benzyl ammonium chloride, alkylpyridinium chloride), anionic surfactants (sodium lignosulfonate, dialkyl sulfosuccinate, etc.), amphoteric surfactants (alkyldimethylbetaine, dodecylamine ethylglycine, etc.), and the like.

One or more of these adjuvants may be used.

Further, the herbicidal composition of the present invention can be used in combination with other insecticides, fungicides, herbicides, or plant 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 figures, parts indicate parts by weight.

Example 1 After mixing and pulverizing 17 parts of granule compound A, 5 parts of compound B, 10 parts of compound 0, 58 parts of bentonite, 17 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, Compound 010 parts,
60 parts of bentonite, 17 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-420m, Compound B 10 parts, Compound 0 2
Part 0, Kei no ± 25! 20 parts of talc and 5 parts of 17 um of alkylbenzenesulfonic acid were mixed and ground to obtain an irrigation agent.

Test example: Herbicidal effect and phytotoxicity test Filled with paddy soil in a 1/2000 are Wagner pot.
Seeds of cypress, azalea, and chickweed were mixed into the soil surface layer, and 2 seeds of cypress and chickweed were mixed into the soil.
In addition, two paddy rice plants at the two-leaf stage were transplanted. The flooding depth was 3 crn.

3 days before transplanting paddy rice (before weeds appear), 3 days after (weeds start to appear), 8 days after (first leaf stage of Japanese millet), and 15 days after (
Japanese millet 1-leaf stage) K1 A predetermined amount of an irrigation agent of each drug prepared according to Example 3 above was dropped onto the flooded surface.

After 30 and 60 days of chemical treatment, the herbicidal effect and paddy rice damage were evaluated according to the criteria below, and the results were evaluated as
It is shown in Tables to Table 4.

5 Complete control 4 80 inch control 3 60 inch control 2 40% control 1 20 inch control O No effect - No harm ± Slight harm + Small harm Medium harm) 11 Major harm, procedural amendment patent dated February 7, 1980 Mr. Kazuo Wakasugi, Director General of the Agency 1 Display of the case 1982 Patent Application No. 224029 3 Person making the amendment Postal code 100 6 Contents of the amendment (1) “1-benzyl-3-(
Correct "a, a-dimethylbenzyl)" to "rl-(2=fluorobenzyl)-3-(atα-dimethylbenol)".

Procedural amendment (formality) %formula% (5) Person making the amendment 4. Date of supplementary order Anwa February 288, 1959 (Shipping date) Target of five-car stop Specification & Correction Tsuburaya

Claims (1)

[Claims] General formula (wherein, X is a hydrogen atom or a halogen atom, Ht and R
2 represents a methyl group or an ethyl group. ), a dibenzylurea compound represented by 2-chloro-2. A herbicidal composition for rice fields containing 6r-diethyl-N-propoxyethylacetanilide and 2-(2-naphthyloxy)propionaride as active ingredients.