JPS62298505A - Herbicide composition for paddy field - Google Patents

Abstract

PURPOSE:The titled composition having excellent after-effect and harmless to paddy rice plant, containing methyl 2-[(4,6-dimethoxypyrimidin-2-yl) aminocarbonylaminosulfonylm-ethyl]benzoate and two other components as effective components. CONSTITUTION:The titled composition contains, as effective components, a compound of formula I, S-(alpha,alpha-dimethyl)benzyl-1-piperidine carbothioate of formula II and one or more compounds selected from six compounds including 3,7- dichloroquinoline-8-carboxylic acid of formula III and S-ethyl-hexahydro-1H- azepine-1-carbothioate of formula IV at amounts of 1pt.wt., 15-40pts.wt. and 5-25pts.wt., respectively. The composition can be employed over a wide range from the germination of weed just after rice transplantation to a vigorously growing period of the weed, having a long after-effect and exhibiting excellent herbicidal effect against many kinds of weeds ranging from annual weeds to perennial weeds without chemically injuring paddy rice plant.

Description

[Detailed description of the invention] Technical field The present invention relates to a herbicidal composition for paddy fields.

The herbicide composition for paddy fields of the present invention can be used at any time from immediately after rice planting to the peak of weed emergence, has excellent residual efficacy, and exhibits a reliable control effect on a wide range of weed species, and does not cause chemical damage to paddy rice. It's something that doesn't exist.

Prior Art Conventionally, herbicides for paddy fields in Japan have been broadly classified into three types based on the period of use: initial, intermediate, and late herbicides.

Initial agents are effective when used before or after rice planting, that is, before the start of weed germination, but they have drawbacks in their herbicidal power and residual effectiveness, resulting in weeds being left behind and later emerging. On the other hand, mid-term agents have a fairly strong herbicidal power and are effective even against weeds in their prime stage of growth, but if used early after rice planting, they cause significant chemical damage to paddy rice, so the period of use is limited.

In reality, the desired purpose is finally achieved by using these initial agents and intermediate agents together.However,
These herbicides are not sufficiently effective against perennial weeds such as Japanese snail, Japanese cyperus, Japanese cypress, and black porgy, which have become problem weeds in recent years.

For these reasons, there have been expectations for the emergence of a new herbicide that is safe for paddy rice, highly effective against perennial weeds, and that can achieve its purpose with a single application.

Recently, in order to meet this demand, several new herbicides called -herbicides have been introduced.

All of these herbicides have a wide range of herbicides and are highly effective, but on the other hand, they are insufficiently safe for paddy rice and may cause harmful effects, such as when exposed to high temperatures after spraying. If the days are too long or the planting depth is too shallow, problems will appear in the growth of paddy rice. Furthermore, it cannot be said to be sufficiently effective against weeds that are difficult to control, such as Cyperus japonica and Omodaka.

On the other hand, the mixed use of component (1) and component (2) used in the present invention is disclosed in JP-A-59-82307. In this case, compound (1) is not complementary to each other by exhibiting excellent herbicidal effects against wild grass, and compound (1) is effective against a wide range of weed species other than wild grass, but component (I) Ingredients for chemical damage to paddy rice (
It is already known that 10 has a substantially mitigating effect.

However, a mixture of component (1) and component (IQ)
(hereinafter sometimes referred to as "mixture (I) ■") has some drawbacks in its residual effect.For example, after chemical treatment, rain continues and the water from the rice fields runs off, and continued low temperatures cause weeds to grow. When extracting for a long period of time, the herbicidal effect decreases significantly.

In addition, several examples are known regarding the herbicidal effect and rice safety when mixing component (1) and component (2). For example, JP-A No. 60-42313, No. 6
There are publications such as No. 0-112703 and No. 61-5004.

However, a mixture of component (1) and any of the components (to) (hereinafter sometimes referred to as "mixture (1) If the paddy rice seedlings are too soft or the soil is damaged due to sandy soil, phytotoxicity may occur.

In addition, small paddy rice seedlings are susceptible to chemical damage, which limits the period of use.

SUMMARY OF THE INVENTION The present invention has been made as a result of intensive research to solve the above problems.

That is, the present invention provides component (I): 2-[(4,6-dimethoxypyrimidin-2-yl)aminocarbonylaminosulfonylmethyl)benzoic acid methyl ester component (IQ: S-(α,α-dimethyl) benzyl-1-
piperidine carbothioate, and ingredients ([10:3
, 7-dicarboxylic acid, S-ethyl-hexamine-1H-azepine-1-carbothioate, S-benzyl-N-ethyl-N-(1,2-dimethyl)furopyrtheocarboxylate -pame), 2,6-diethyl-N
-butoxymethyl-α-chloroacetanilide, 2.6
- ethyl-N-poxyethyl-α-chloroacetanilide, and a compound with a length of 1 m or more selected from the group of N-methyl-2-(1,3-benzotheacy-2-yl)oxyacetanilide as an active ingredient. The present invention provides a characteristic herbicide composition for paddy fields.

3 sons 1 so 1 L The herbicide composition of the present invention is a herbicidal composition of the present invention, which combines mixture (1) ( It improves the disadvantages of IF) and extends the residual period, and also improves the
The defects of ll) have been improved and the safety for paddy rice has been significantly improved.

Thus, the present invention not only overcomes the seemingly contradictory problem, but also provides mixtures (1)(n) and (1)(I[D
It exhibits an extremely superior herbicidal effect at a substantially lower dose than that of the herbicide.

All of the above effects were completely unexpected from known techniques and were achieved for the first time by the present invention.

Detailed Description of the Invention The compounds used as the active ingredients of the herbicide composition for paddy fields of the present invention are as follows.

Component (1): 2-[(4,6-dimethoxypyrimidine-
2-yl)aminocarbonylaminosulfonylmethyl]
Benzoic acid methyl ester.

Component (TD: S-(α,α-dimethyl)benzyl-1-
Piperidine carbothioate, Hs Component (A): 3,7-dichloroquinoline-8-carboxylic acid [(I)-1], S-ethyl-hexahydro-1H-
azepine-1-carbothiony) [(IQ-2), S-
Benzyl-N-ethyl-N-(1,2-dimethyl)propylthiocarbamate [(to)-3], 2,6-diethyl-N-butoxymethyl-α-chloroaceto 7=')Y
(alD-<], 2,6-dixf&-N-propoxyethyl-α-lytetraacetoani IJ)” [(to)-5],
and one or more compounds selected from the group of N-methyl-2-(1,3-benzothiazo-2-yl)oxyacetanilide [(t)-6].

■-IQIO-2 (III)-3(m)-4 (III)-5CIII)-a The herbicide composition for paddy fields of the present invention exhibits a strong synergistic effect in a wide range of composition ratios, but three types of effective The mixing ratio of the components is usually 10 to 50 parts by weight of component (6) D compound and 2 to 50 parts by weight of component (1) to 1 part by weight of component (I). Preferably, 15 to 40 parts by weight of the compound (2) and 5 to 25 parts by weight of the compound (0) are used per 1 part by weight of the compound (I).

The effective application amount of the composition of the present invention varies depending on the area to be controlled, the occurrence of weeds, etc., but the amount of mixed active ingredients is 1 h.
It is 1 to 10 kg per a.

When applying the composition of the present invention as a herbicide, generally known suitable carriers, such as solid carriers such as clay, talc, bentonite, and diatoms, or water, alcohols (methanol, ethanol, etc.), aromatic hydrocarbons, etc. kind (
benzene, toluene, xylene, etc.), chlorinated hydrocarbons, ethers, ketones, esters (ethyl acetate, etc.)
, acid amides (dimethylformamide, etc.), etc., and can be applied by mixing with liquid carriers such as acid amides (dimethylformamide, etc.). can be added to form any formulation such as granules, emulsions, wettable powders, and sol formulations for practical use.

Further, if necessary, it may be used in combination with other known herbicides, various fungicides, insecticides, planting agents, synergists, etc. during formulation or spraying.

EXPERIMENTAL EXAMPLES The present invention will be explained in more detail with reference to formulation examples and test examples below.

"Parts" used in the examples are by weight.

Formulation Example 1 (Granules) Compound of component (T): 0.2 parts, compound of component (■) 24 parts, compound of component @)-1 = 0.8 part, bentonite:
After uniformly grinding and mixing 2 parts of sodium 7' silbenzenesulfonate and 2 parts of sodium ligninsulfonate, an appropriate amount of water was added, kneaded, and extruded into granules. , dried, and sized to obtain granules.

Formulation Examples 2 to 7 Granules shown in Table 1 were obtained in the same manner as Formulation Example 1, except that the compound of component (1) and bentonite were changed as shown in Table 1. (
The numerical values in the table represent weight %. ) Table 1 Formulation Example 8 (Emulsion) Compound of component (1) = 1 part, compound of component (g) = 20
parts, components ([Compound D-1 = 4 parts, polyoxyethylene alkyl ether and calcium dodecylbenzenesulfonate: 15 parts were dissolved in an equal volume mixture of xylene and cyclohexanone = 60 parts to obtain an emulsion. .

Test Example 1 (Paddy rice phytotoxicity test) Fine gravel, river sand,
Paddy soil (sandy soil) mixed with an appropriate amount of chemical fertilizer was filled up in stages, and two paddy rice seedlings that had reached the two-leaf stage were transplanted into each pot, four plants per pot. 7 days after transplantation,
The granules produced in the above formulation example, the commercially available mixed herbicide, and the granules of the comparative mixture shown in Table 2 were treated using the granules prepared according to formulation examples 1 to 6, respectively.

Starting from the next day, water was drained from the bottom of the pot at a rate of 2 os/day for 5 days. Thereafter, the plants were grown in a greenhouse while maintaining a water depth of 3 to 4 degrees. After 25 days of chemical treatment, the paddy rice was pulled out and separated into stems, leaves and roots for a few seconds, and the air-dried weight of each was measured and compared with the untreated plot. Table 2 shows the results.
Shown below.

(Leaving space below) Table 2 *: Commercially available mixed herbicide product name ``Oza'' (mixed herbicide of ``Butachlor'' manufactured by Monsando and ``Naproanilide'' manufactured by Mitsui Toatsu Chemical @) It is shown that the chemical damage to paddy rice that should originally be caused by (1) is significantly reduced in the composition of the present invention, reaching a level where there is virtually no problem at all.

Test example 2 (residual effect test) Fine gravel, river sand,
Paddy soil (sand soil) mixed with an appropriate amount of chemical fertilizer was packed in stages and treated the next day with the same granules used in Test Example 1 and a comparative agent formulated according to Formulation Example.

Water was drained from the bottom of the pot at a rate of 2α/day for 7 days from the day after the chemical treatment, and on the 8th day, seeds of wild grass and firefly were sown in fixed amounts. Thereafter, the plants were grown in a greenhouse while maintaining a water depth of 3 to 43 cm. 25 days after sowing, the above-ground parts of the remaining plants were collected and their fresh weight was measured, and Table 3 shows the results of comparison with the untreated plot.

(Margins below) Table 3 *: Commercially available mixed weed killer Wk (trade name: "Oza") This test result shows that the residual effectiveness of mixture (1) (10) is significantly improved by the composition of the present invention. Above, test example 1
and 2, the herbicidal composition of the present invention can be obtained from the known mixture (I
) CI and (I) GID are found to be extremely superior herbicides.

Furthermore, the composition of the present invention not only improves the drawbacks of the above-mentioned known drugs, but also demonstrates in more detail that the three active compounds constitute an excellent synergistic effect using Novieum as a representative plant. .

Colby's calculation formula is usually used as a method for testing the interaction of three types of active compounds. That is, 100
1000G However, X - herbicidal effect when using compound
g) 2 = Herbicidal effect when using n kg/ha of compound 2 @) E = x, y, z respectively, m, n9/h
If the predicted herbicidal effect (actually measured herbicidal effect (70)) exceeds E, it means that the composition has a synergistic effect, and if it is less than E, it means that there is an antagonistic effect.

Test Example 3 (Testing of interaction) A Wagner pot with an area of 200 cm was filled with the odor of paddy soil mixed with an appropriate amount of chemical fertilizer, and a fixed amount of Japanese wild grass was sown in each pot. Thirteen days after sowing (2.5 leaf stage of wildflowers), the plants were treated with the granules shown in Table 4, and thereafter grown in a greenhouse. 25 days after the chemical treatment, the remaining aerial parts of the plants were collected and their fresh weight was measured, and Table 4 shows the results of comparison with the untreated plot.

The results of this study show that the interaction between the three drugs is clearly synergistic.

(The following is a blank space) Table 4 Next, Test Example 4 shows the excellent herbicidal effect of the herbicide composition of the present invention.
and Tables 5 and 6.

Test Example 4 (Weed Killing Spectrum) A Wagnerbot with an area of 200 (-Ill) was filled with the odor of paddy soil mixed with an appropriate amount of chemical fertilizer, and this was filled with grasshoppers, grasshoppers,
Seeds of Hotarui, Cyperus japonica, and Helaomodaka and tubers of Urhikawa, Cyperus japonica, and Omodaka were sown, respectively, and one plant (two plants) of paddy rice at the two-leaf stage was transplanted. This test material was divided into two groups, one group used the predetermined amounts of each granule shown in Tables 5 and 6 at the time of weed germination 3 days after weed sowing, and the other group used 11 days after weed sowing at the second leaf stage of wild grass. Processed.

Tables 5 and 6 show the results of observational evaluation of the herbicidal effect on each weed and the chemical damage to paddy rice 25 days after the chemical treatment.
゛The herbicidal effect and the degree of paddy rice chemical damage were each expressed using 6-level numerical values and codes based on the following criteria.

Weeding effect Paddy rice damage 5: Weeding rate 100% ×: Death 4: #8
1-99% 4+): Human harm 3: #61-80% +: Medium harm 2: #41-60% +: Minor harm 1: z21-40% ±: Slight harm 0: #0-2
0% -2 harmless (blank below) Table 5 (Treatment at the time of weed germination) *: Product name "Oza" Table 6 (Treatment at the peak of weed emergence) *: Product name "Oza" From the results of each test example detailed above As is clear, the herbicide composition for paddy fields of the present invention can be used in a wide period from the time of weed germination immediately after rice planting to the peak of weed growth, and the mixture (1)
1 mixture (I) (
It is a well-balanced product that reduces the phytotoxic effects of IID, exhibits excellent herbicidal effects on a wide range of annual and perennial grass species, and shows no phytotoxic effects on paddy rice.

Patent applicant: Mitsubishi Yuka Co., Ltd. Agent: Patent Attorney Masahisa Nagatani Agent Patent Attorney Takaya Yamamoto

Claims (1)

[Claims] (1) Component (I): 2-[(4,6-dimethoxypyrimidin-2-yl)aminocarbonylaminosulfonylmethyl]benzoic acid methyl ester, Component (II): S-(
α,α-dimethyl)benzyl-1-piperidinecarbothioate and component (III): 3,7-dichloroquinoline-8-carboxylic acid, 5-ethyl-hexahydro-1
H-azepine-1-carbothioate, S-benzyl-
N-ethyl-N-(1,2-dimethyl)propylthiocarbamate, 2,6-diethyl-N-butoxymethyl-
one or more selected from the group of α-chloroacetanilide, 2,6-diethyl-N-propoxyethyl-α-chloroacetanilide, and N-methyl-2-(1,3-benzothiazo-2-yl)oxyacetanilide; A herbicide composition for paddy fields, comprising the compound as an active ingredient.