JPH04247002A - Method for eliminating herbicide and weed - Google Patents

Abstract

PURPOSE: To obtain a herbicide having good selective herbicidal activities against weed, especially the weed in rice by using a mixture of benfuresate and dymrone as an active ingredient. CONSTITUTION: This herbicide includes (A) benfuresate (2,3-dihydro-3,3- dimethyl-5-benzofuranylethanesulfonate) and (B) dymrone [1-(4-methylphenyl)-3-(1- methyl-1-phenylethyl)urea] in (1:10) to (1:1) weight ratio of components A to B as an active ingredient. The herbicide is used for a weed or a gene thereof, and especially suitable for control of a weed in rice because having an antagonistic activities (toxicity-emollient activities) against a cultivated plant, especially the rice.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to benfuresate (benfuresate).
nfuresate) and dymron (dymron
).

0002

It has been found that herbicides containing as active ingredients a mixture of a) benfuresate and b) Daimeron have good selective herbicidal activity in certain cultivated plants, such as rice.

These components or mixtures thereof exhibit antagonistic effects in cultivated plants and can be referred to as antidotes or palliatives.

Benfuresate has a common name 2,3-dihydro-3,3-dimethyl-5-benzofuranylethanesulfonate.

Daimeron's generic name is 1-(4-methylphenyl)-3-(1-methyl-1-phenythyl)urea.

The weight ratio of components a) and b) is generally 1:
It is between 10 and 10:1.

The mixtures according to the invention may also be used in mixtures with other active agents, for example other plant protection agents or insecticides.

Improvements in the strength and speed of action can be achieved, for example, by
Obtained by addition of suitable auxiliaries such as organic solvents, lubricants and oils. Such additives may allow dosage reduction.

The active ingredients or mixtures thereof may be present in the presence of liquid and/or solid carriers and/or diluents, for example as powders, fine powders, granules, solutions, emulsions or suspensions, as appropriate. Optionally, binding aids, lubricating aids, emulsifying aids and/or dispersing aids can also be used.

Suitable liquid carriers are, for example, aliphatic and aromatic hydrocarbons, such as benzene, toluene, xylene, cyclohexanone, isophorone, dimethylsulfoxide, dimethylformamide and further mineral oil fractions and vegetable oils.

Suitable solid carriers include, for example, bentonite, silica gel, talc, china clay, attapulgite, limestone, silicic acid and vegetable products such as flour.

Examples of surfactants include calcium lignosulfonate, polyoxyethylene alkylphenyl ether, naphthalene sulfonic acid and salts thereof,
Phenolsulfonic acids and their salts, formaldehyde condensates, fatty alcohol sulfates and substituted benzenesulfonic acids and their salts can be used.

The percentage of active ingredient in the various preparations can vary within a wide range. For example, the composition may include about 10-90% by weight of active ingredient and 9% by weight of a liquid or solid carrier.
0 to 10% by weight and optionally surfactant 20%
% by weight.

The drug can be supplied in a conventional manner, for example in a spray mixture with a volume of about 100 to 1000 l/ha with water as carrier. The drug can be delivered using low or ultra-low volumes known in the art or in the form of so-called microparticles.

The preparations described above can be carried out in known manner, for example by grinding or mixing steps. In some cases, the individual ingredients may be subjected to immediately prior to use, for example in the so-called commonly used tank mixing
k-mixing) method.

The following examples describe the use of compositions according to the invention.

[0017]

[Example] Example A Container (13.5 x 13.5 cm and height 8.0 cm)
Echinochloa crus-
seeds of Cyperu galli and seeds of Cyperu galli
Soil containing tubers of S serotinus)90
It was filled using 0 ml. After one day, the containers were covered with a plastic membrane to avoid drying out. Two days later,
A grass family plant that has reached the 2.5-leaf stage [variety Koshihikari (k
oshihikari)] were transplanted into the containers at a depth of 3 cm and 1 cm. Seedlings were supported at a depth of 1 cm with stakes. After 3 days of cultivating the rice, the solution of the active ingredient was distributed over the soil surface using a pipette as evenly as possible. The container was filled with water to 1-2 levels. After 18 days of use, the damage in percentage was evaluated. Evaluations were performed in comparison to controls.

The results are shown in the table below, where O
RYSP = 3cm deep rice (Oryza)
sativa) ORYSI = 1 cm deep rice (Oryza
sativa) ECHCG = Echinochlo
a crus-galli) CYPSE = water hawk (Cyperus
serotinus).

[0019]
O O
E C

R R C Y

Y Y
HP

S S C S
Component Proportion in g/ha P I G E
Benfresate 50
0 0 90 90 100

750 5 90 90
100
1000 5 90
90 95 Daimeron
500 0 0
10 40
1000 0
0 10 50 Benfresate + Daimron 500+ 500
0 10 80 90
500+1000
0 10 80 90
750+50
0 5 20 90 100
750+100
0 5 10 90 100
1000+50
0 5 50 100 95
1000+1000
5 50 100 100 At all concentrations, the mixture was observed to exhibit obvious toxicity mitigation effects in rice grown at a depth of 1 cm. Echinochloa crus-ga
lli) and water hawk (Cyperus se
The herbicidal activity against P. rotinus was hardly affected.

Claims (4)

[Claims] Claim 1: In a herbicide, as an active ingredient, a
A herbicide characterized in that it contains a mixture of a) Benfresate and b) Daimeron. [Claim 2] The weight ratio of components a) and b) is 1:10.
2. The herbicide of claim 1, wherein the herbicide is between 10:1 and 10:1. 3. A method for controlling weeds, which comprises using the herbicide according to claim 1 or 2 against weeds or the genes of the weeds. Claim 4: Claim 3, which controls weeds in rice.
Method described.