JPH01193202A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE:To obtain the title composition effective against various kinds of weeds in all stage of growth, by combining O-3-t- or or O-4-t-butylphenyl N-(6- methoxy-2-pyridyl)-N-methylthiocarbamate with NC-360. CONSTITUTION:A herbicide composition for paddy fields which is obtained by combining one or more of O-3-t-butylphenyl N-(6-methoxy-2-pyridyl)-N- methylthiocarbamate and O-4-t-butylphenyl N-(6-methoxy-2-pyridyl)-N- methylthiocarbamate with NC-310, namely, 5-benzyloxy-4-(2,4-dichlorobenzoyl)-1- methylpyrazole in the ratio of 1 pt.wt. of the former and 0.1-10 pts.wt. of the latter, has excellent herbicidal effects and high safety to paddy-rice plants, wherein each active ingredient shows more excellent synergistic effects than effects of single substance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a herbicidal composition, and more specifically to a herbicide composition containing 0-3-te
rt-Butylphenyl N-(6-methoxy-2-pyridyl)-N-% thylthiocarbamate or 0-4-Le
One or two types of rt-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate and 5-benzyloxy-4-(2,4-diclobenzoyl)-1-methylpyrazole. The present invention relates to a herbicide composition with excellent herbicidal effects, which is characterized by containing the composition as an active ingredient.

(Prior Art) A large number of herbicides for rice cultivation have already been developed, but there is still strong demand in the market for improved performance, safety, and reduced chemical damage.

In addition, the characteristics of rice field weeds are that many of them do not occur at the same time and occur over a long period of time, and the growth state of the weeds at the time of herbicide application is at various stages of development, from pre-emergence to somewhat advanced growth. There is always a mix of things. For this reason, it is not possible to obtain satisfactory results with just one application of the herbicide, and the herbicide must be applied several times.

(Problems to be Solved by the Invention) The present inventors have found that by spraying a low dose of a chemical, it is possible to almost completely control weeds from pre-germination to weeds that have grown to some extent, and the effect is maintained for a long period of time. As a result of intensive research to develop an excellent herbicide that is highly safe for paddy rice, we found that ○-3-tert-butylphenyl N-(6-methoxy-2-pyridylmi N-methylthiocarbamate or 0- 4-tert-butylphenyl N-(6-nodoxy-2=pyridyl)-N-methylthiocarbamate 1
species or two species and 5-benzyloxy-4-(2゜4-
The present invention was completed based on the discovery that by mixing and applying dichlorobenzoyl-1-methylpyrazole in an appropriate ratio, a remarkable synergistic effect that far exceeds expectations can be obtained.

(Means for Solving the Problems) The herbicide composition of the present invention has an excellent herbicidal effect and is highly safe for paddy rice. It has a synergistic effect.

That is, the present invention provides 0-3-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate (hereinafter referred to as compound ①) or 0-4
-tert-butylphenyl N-(6-methoxy-2-
5-benzyloxy-4-(2,4-dichlorobenzoyl)-1-methylpyrazole (hereinafter referred to as NC-310 The present invention provides a herbicidal composition for paddy fields, which is characterized by containing the following as an active ingredient.

(Effect) When Compound ■ or Compound ■ is used alone as a rice field herbicide, it kills weeds such as weeds, grasshoppers, etc. in the pre-germination stage.
It is highly effective against fireflies, fireflies, etc., and is also effective against fireflies, etc. The major feature of this drug is that it has a herbicidal effect on weeds, even those that have grown to a certain extent after germination, and there is no practical harm to transplanted paddy rice. . however,
Especially during the weed growing season, the herbicidal effect is not sufficient against some perennial weeds.

On the other hand, when N C-310 is used alone as a herbicide for paddy fields, it is effective against not only annual weeds such as field weeds, Japanese grass weeds, and Japanese cypresses, but also on Japanese cypresses.

It is also effective against perennial weeds such as weed.

In addition, it is highly safe for transplanted paddy rice and highly useful as a herbicide for paddy fields.However, its weeding effect against Japanese grasshopper and firefly is not perfect.

One or two of Compound I or Compound ■ and NC-3
It was completely unexpected that the herbicidal composition of the present invention, which is formulated with 10 and 10, not only compensates for the shortcomings of each drug, but also exhibits an extremely significant synergistic effect.

The blending ratio of each active ingredient in the herbicidal composition of the present invention is not particularly limited, and an excellent synergistic effect can be obtained in a wide range of blending ratios, but preferably 1 part by weight of Compound (1) or one or both of Compound (2) On the other hand, NC-310 is 0.1 to 10
Parts by weight are appropriate.

When the herbicidal composition of the present invention is actually used, one or two of compound (1) or compound (2) and NC-310
An appropriate amount of each can be mixed with an inert carrier and used in various forms such as granules, fine granules, wettable powders, emulsions, powders, and flowable preparations, which are commonly used forms of agricultural chemicals.

Solid carriers include calcium carbonate, apatite, gypsum, silica gel, vermiculite, mica, geysou earth,
Mineral powders such as talc, pyroferrite, acid clay, clay, kaolinite, montmorillonite, bentonite, white carbon, and pumice powder, vegetable powders such as crystalline cellulose and starch, and polymeric compounds such as polyvinyl chloride and petroleum resins. etc. can be mentioned.

Examples of liquid carriers include alcohols such as methanol, ethanol, cyclohexanol, amyl alcohol, and ethylene glycol, aromatic hydrocarbons such as benzene, toluene, xylene, and methylnaphthalene, ketones such as isophorone and cyclohexanone, chlorobenzene, trichloroethylene, etc. halogenated hydrocarbons, ethers such as ethyl cellosolve, butyl cellosolve, and dioxane, esters such as in-10-pylacetate and benzyl acetate, polar solvents such as dimethylformamide and dimethyl sulfoxide, gelosin, mineral oil, water, etc. Can be done.

Furthermore, if necessary for the formulation, the reliability of the herbicidal effect can be increased by adding auxiliary agents used in agricultural chemicals such as surfactants, spreading agents, and binders, or stabilizers.

In addition, the herbicide composition of the present invention may optionally contain an insecticide,
It may contain fungicides, plant growth regulators, fertilizers, or other herbicides, or may be used in combination with these.

In particular, in order to further improve the effectiveness as a herbicide, it may be appropriate to add and mix other herbicides. As a herbicide that can be added, 2,4-bis(ethylamino)
-6-ethylthio-1,3,5=triazine [Common name:
simetrine), 2,4-bis(isopropylamino)-
6-Methylthio-1゜3.5-) riazine [generic name: promethrin], 2-(1,2-dimethylpropylamino)-4-ethylamino-6-methylthio-1,3,5-
Triazine herbicides such as triazine [generic name: dimethamethrine]; 5-4-chlorobenzyl N,N-diethylthiocarbamate [generic name: bentiocarb], S-α,
α-dimethylbenzyl N, N-pentamethylene thiocarbamate [generic name: dimepiperate], S-benzyl N
- Carbamate herbicides such as ethyl N-(1,2-dimethylpropyl)thiocarbamate [generic name: nisprocarb], S-ethylhexahydro-IH-azepine-1-carbothioate [generic name: molinate]; 2 ,4-
D, MCPB, 2-(2-naphthyloxy)propionanilide [generic name: naproanilide], 2-(2゜4-
Phenoxy herbicides such as dichloro-3-methylphenoxy) propionanilide [generic name: clomeprop];
2.4.6-) Dichlorophenyl 4-nitrophenyl ether [generic name: chlornitrophen], 2.4-dichlorophenyl 3-methoxy-4-nitrophenyl ether [generic name: chromethoxynil], 2.4-dichlorophenyl 3-methoxy Carbonyl-4-nitrophenyl ether [generic name: Bifenox], 2-chloro-4
-trifluoromethylphenyl 4-nitro-3-(tetrahydropyran-3-yloxy)phenyl ether [
Test name: Diphenyl ether herbicides such as MT-124); N-butoxymethyl-2-chloro-2',6'-diethylacetanilide [generic name: butachlor], N-
Propoxyethyl-2-chloro-2',6'-diethylacedoaninit [generic name: pretilachlor], N-methyl-2-(2-benzothiazolyloxy)acetanilide [generic name: mefenacet], 2.3 -dichloro-
4-Ethoxymethoxybenzanilide [Test name: HW-
52) Amide-based herbicides such as N-(α,α-dimethylbenzyl)-2-bromo-3,3-dimethylbutyramide [generic name: bromobutide], 3,4-dichloropropionanilide [generic name: propanil], etc. agent; 1-(α, α-
dimethylbenzyl)-3-(4-methylphenyl)urea [generic name: Daimeron], 1-(2-chlorobenzyl)-3-(α,α-dimethylbenzyl)urea [test name: JC-940), etc. Urea herbicide; 2-amino-3
-Quinone herbicides such as chloro-1,4-naphthoquinone [generic name: ACN]; 4-(2,4-dichlorobenzoyl)-1,3-dimethyl-5-pyrazolyl 9-)luenesulfonate [generic name: Virazolate), 4-(2゜4-
dichlorobenzoyl)-1,3-dimethyl-5-phenacyloxypyrazole (generic name: virazoxifene),
4-(2,4-dichloro-3-methylbenzoyl)-1
,3-dimethyl-5-(4-methylphenacyloxy)
Pyrazole [generic name: benzofenap], 5-te
rt-Butyl-3-(2,4-dichloro-5-isopropoxyphenyl)-1゜3.4-oxadiazole-2
-(3H)-one [generic name: oxacyacin], 3.7
-dichloro-8-quinolinecarboxylic acid [generic name: quinclorac], 3-chloro-2-[2-fluoro-4-chloro-5-(1-propynyloxy)phenyl]-4,
5,6,7-tetrahydro-2H-indazole [Test name: S-275], 3-isopropyl-2°1.3
-Benzothiadiazinone-(4)-2,2-dioxide [generic name: pentacine], 1-(3-methylphenyl)
-5-phenyl-IH-1,2,4-triazole-3
-Heterocyclic herbicides such as carboxamide [test name: KNW-242]; 0. Organophosphorus herbicides such as o-diisopropyl-2-(benzenesulfonamide) ethylene dithiophosphate [common name: 5AP], 2-((4,6-cymethoxypyrimidin-2-yl-aminocarbonylaminosulfonyl) Methyl] benzoic acid methyl ester [generic name: bensulfuron methyl), N-((4,6-cymethoxypyrimidin-2-yl)aminocarbonyl] = 4-
Examples include sulfonylurea herbicides such as ethoxycarbonyl-1-methyl-5-pyrazolesulfonamide [common name: pyrazosulfuronethyl].

The amount of each active ingredient when preparing the herbicide composition of the present invention varies depending on the application situation, application time, application method, target grass species, etc.
or Compound (2) is generally 1 to 5011, preferably 2 to 30 g, and N C-310 is generally 1 to 1
00g, preferably in the range of 3 to 50g. In addition, the total amount of active ingredients is -2 to 15 per are for boat fishing.
0. , preferably in the range of 5 to 80 degrees.

The content of the total active ingredients in the formulation is generally in the range of 1 to 90%, preferably 2 to 80% by weight.

(Example) Next, examples of formulations of the herbicide composition of the present invention will be explained.
The present invention is not limited to these. In the examples, "1 part" indicates part by weight.

Example 1 Compound (10 parts NC-31015 part Diatomaceous earth 71 parts The above components were mixed and ground to obtain an aqueous phase agent.

Example 2 Compound I 4 parts Compound ■ 1 part NC-3107, 5 parts Tsurpol 800A 10 parts xylene
77.5 parts Mix and dissolve the above ingredients,
An emulsion was obtained.

Example 3 Compound 1 4 parts NC-310 3 parts Bentonite 35 parts Talc 55 parts Tsurupol 80
0 A 3 parts After mixing and pulverizing the above ingredients, an appropriate amount of water was added and kneaded, extruded through a knot hole with a diameter of 0.71, and after drying, the mixture was cut into lengths of 1 to 2 sm to obtain granules.

Next, the excellent herbicidal effect of the herbicide composition of the present invention will be explained using Examples and Comparative Examples.

Example 4 and Comparative Examples Paddy soil that had been made into a paddy field by adding water was put into a plastic container with a diameter of 21 cm, seeds of various weeds were sown on the surface layer of the soil, and the germinated tubers of Cyperus japonica and Urikawa were transplanted. Two paddy rice seedlings (variety Nihonbare) at the two-leaf stage were planted at a depth of 1C11. That f! 2cm
It was flooded with water and left in a greenhouse.

Three days after transplanting paddy rice (before the germination of wild plants) and 10 days after transplanting paddy rice (two-leaf stage of wild plants), a predetermined amount of granules of the herbicide composition of the present invention was administered according to the method shown in Example 3. ,
Sprayed by hand. The plants were then placed in a greenhouse and watered at appropriate times. Three weeks after the chemical treatment, the herbicidal effect and damage to paddy rice were investigated. Table 1 shows the results of the treatment 3 days after rice transplantation, and Table 2 shows the results of the treatment 10 days after rice transplantation. The "drug amount" in each table indicates the amount of active ingredient converted to the amount per 1 a of paddy field. Evaluation of herbicidal effect and phytotoxicity was determined by observation according to the following criteria.

Weeding effect judgment criteria Chemical damage judgment criteria 10:100%
Pest control - 2 no Harm 9: 90% control
Master: Minor harm 8: 80% control +: Minor harm 7
: 70% control Minor: Medium Harm 6: 60% control
-1Il-: Major damage 5: 50% control
×: blight 4: 40% control 3: 30% control 2: 20% control 1: 10% control 0: 0% control As a comparative example, each active ingredient compound was treated alone in the same manner as in the above example, and no The herbicidal effects and phytotoxicity of the treated plots were also evaluated according to the above criteria and are shown in the table below.

The excellent synergistic effect of each active compound brought about by the present invention is already clear from the results of Example 4, but it will be explained in more detail using Cyperus japonica, which is one of the difficult-to-control weeds, as a representative grass species. .

As a method for testing the interaction between two types of active compounds, the Colby calculation formula described in Weeds Vol. 15, pp. 20-22, 1967 is usually used.

However, X = herbicidal effect (%) when using 9 g/a of compound A Y
= Herbicidal effect (%) when using compound B at Qg/a E=A
Expected herbicidal effect (%) when using p and qg/a of B, respectively.If the actually measured herbicidal effect (%) exceeds E,
It shows that there is a synergistic effect in the composition.

EXAMPLES Hereinafter, the interaction test of the herbicide composition of the present invention and its results will be shown in Examples.

Example 5 Into a plastic container with an area of 1836 cm 2 (31 em × 56 am), paddy soil in a plowed state was poured to a depth of 7 cm from the bottom, and 10 tubers of Cyperus japonica were transplanted into the container.

The next day, the plants were flooded with 3 c of water and grown in a greenhouse. transplant 7
After a day, a predetermined amount of the herbicide composition of the present invention prepared according to Example 3 and granules containing each active ingredient compound alone were sprayed by hand. The plants were then placed in a greenhouse and watered at appropriate times.

Thirty days after the chemical treatment, the remaining stems and leaves of Cyperus spp. were cut and collected, the windfall weight was measured, and the herbicidal effect was calculated using the following formula, and the results are shown in Table 3.

Herbicidal effect (%) = Table 3 (Effect of the invention) As is clear from Tables 1, 2, and 3, the herbicidal composition of the present invention has a higher herbicidal effect than when each active ingredient is applied alone. The herbicidal power has been significantly enhanced. This is due to the synergistic effect between each active ingredient, and it is recognized that there is a significant synergistic effect.

In other words, the greatest feature of the herbicide composition of the present invention is that a high herbicidal effect against many weeds can be obtained by combining low dosages that could not be expected from the herbicidal effects of each active ingredient alone. I can list things that I can do.

In addition, the herbicide composition of the present invention exhibits remarkable herbicidal activity not only against weeds at the early stage of growth but also against weeds at a certain stage of advanced growth. One of its excellent features is that it has a wide range of suitable processing periods.

Furthermore, there are many types of weeds that can be controlled, and a remarkable herbicidal effect has been observed on annual weeds such as Japanese wild grass, Japanese cypress, Japanese cypress, and perennial weeds such as Japanese firefly, Japanese cypress, and staghorn weed. Moreover, it does not cause any chemical damage to transplanted paddy rice, making it highly useful as a highly safe and highly selective herbicide. Part 1: Each active ingredient has a long residual effect, so it shows high herbicidal activity over a long period of time and can control many weeds.
It greatly contributes to the reduction of spraying labor, that is, the labor saving of agricultural work.

As described above, the herbicidal composition of the present invention has many excellent characteristics and is highly practical.

Claims (1)

[Claims] O-3-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate or O-4-tert-butylphenyl N-(6-methoxy-2-pyridyl)-N-methylthiocarbamate 1. A herbicidal composition for paddy fields, comprising one or two kinds of herbicides and 5-benzyloxy-4-(2,4-dichlorobenzoyl)-1-methylpyrazole as active ingredients.