JPH0597614A - Herbicide composition - Google Patents

Abstract

PURPOSE:To effectively control harmful perennial weeds in paddy field, especially weeds of family Cyperaceae by using dymron in combination with a known herbicide having high safety to rice plant and effective for perennial weeds of family Cyperaceae. CONSTITUTION:The objective herbicide composition is produced by compounding (A) 1 pt.wt. of the compound of formula I exhibiting excellent herbicidal effect at a low rate of application, having high safety to crops such as rice plant and effective even for perennial weeds of family Cyperaceae with (B) 1-500 pts.wt., preferably about 10-150 pts.wt. of dymron of formula II. The composition can effectively control Scirpus nipponicus, Scirpus maritimus (sea club-rush), etc., which are weeds of family Cyperaceae recently found to cause considerable troubles in the culture of paddy rice plant.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a herbicidal composition for efficiently controlling harmful perennial weeds, especially Cyperaceae weeds, in a paddy field by mixing two kinds of known herbicidal active ingredients. ..

[0002]

2. Description of the Related Art A wide variety of chemicals have been put into practical use through many years of research and development of herbicides, and these herbicides have contributed to labor saving of weed control work and improvement of productivity of agricultural and horticultural crops. Even today, there is a demand for the development of a new drug having more excellent herbicidal properties, and particularly as a herbicide for agriculture and horticulture,
Although it is desirable to be able to control only the target weeds selectively and at a low dose without causing phytotoxicity to the cultivated crops, existing agents do not always meet this requirement.

The compound represented by the formula (1) (hereinafter referred to as the compound (1)) is a known compound described in JP-A-59-122488 and has a lower dose than conventional herbicides. It has already been put to practical use as a herbicide that has an excellent herbicidal effect on plants and is highly safe against crops such as rice.
It is known that the compound (1) is also effective for the above-mentioned perennial Cyperaceae weeds, but depending on the conditions, a complete control effect may not be obtained, and improvement is desired.

On the other hand, the compound represented by the formula (2) (hereinafter,
The compound (referred to as compound (2)) is a herbicide that has already been put into practical use under the general name Daimlon, and is known to be effective for weeds of Cyperaceae. The compound (2) is mainly used as a mixture in combination with other agents, but it is difficult to obtain a sufficient effect on perennial Cyperaceae weeds.

[0005]

In the cultivation of paddy rice, weeds, which have become increasingly problematic in recent years, include perennial Cyperaceae, Shizui, and Koukirataga, and their effective control measures are desired.

[0006]

The present invention provides compound (1)
And a herbicide composition containing the compound (2) as an active ingredient (hereinafter referred to as the composition of the present invention).

[0007]

[Chemical 2]

The composition of the present invention has not only the additive herbicidal effects of the compound (1) and the compound (2) contained in the composition of the present invention but also a synergistic action. , The amount of each drug used can be reduced. In the present invention, the following components may be further added in addition to these components. 4- (2,4-dichlorobenzoyl) -1,3-dimethyl-5-pyrazolyl-p-toluenesulfonate (generic name pyrazolate), 2- [4- (2,4-dichlorobenzoyl) -1,3-dimethyl Pyrazol-5-yloxy] acetophenone (generic name pyrazoxifene), 2- [4- (2,4-dichloro-m-toluoyl) -1,3-dimethylpyrazol-5-yloxy]
-4-methylacetophenone (general name benzophenap), (RS) -2-bromo-N- (α, α-dimethylbenzyl) -3,3-dimethylbutyramide (general name bromobutide), α- (2- Naphthoxy) propionanilide (generic name naproanilide), (RS) -2- (2
4-dichloro-m-tolyloxy) propionanilide (generic name kromeprop), 2,4,6-trichlorophenyl-4′-nitrophenyl ether (generic name CN
P), 2,4-dichlorophenyl-3'-methoxy-
4'-nitrophenyl ether (generic name clomethoxynil), methyl 5- (2,4-dichlorophenoxy) -2-nitrobenzoate (generic name bifenox), 5-tertiarybutyl-3- (2,4-dichloro) -5-isopropoxyphenyl) -1,3,4-oxadiazoline-
2-one (generic name oxadiazon), 2-benzothiazol-2-yloxy-N-methylacetanilide (generic name mefenacet), 2-chloro-2′-6′-diethyl-N- (butoxymethyl) acetanilide (generic name) Butachlor), S, S'-dimethyl 2-difluoromethyl-4-isobutyl-6-trifluoromethylpyridine-3,5-dicarbothioate (generic name dithiopyr), (Z) -N-but-2-enyl. Oxymethyl-2
-Chloro-2 ', 6'-diethylacetanilide (generic name butenachlor), 2-3-dihydro-3,3-dimethylbenzofuran-5-ylethanesulfonate (generic name benflate), O-3-tertiary Libutylphenyl 6-methoxy-2-pyridyl (methyl) thiocarbamate (generic name pyributycarb), S- (4-chlorobenzyl) -N, N-diethylthiocarbamate (generic name bench ocave), S-1-methyl -1-Phenylethylpiperidine-1-carbothiate (generic name dimepiperate), S-benzyl 1,2-dimethylpropyl (ethyl) thiocarbamate (generic name esprocarb), S-ethylhexahydro-1H-azepine-1-
Carbothioate (generic name molinate), O-ethyl-
O- (3-methyl-6-nitrophenyl) secondary butyl phosphoroamidothioate (generic name butamiphos), 3,7-dichloroquinoline-8-carboxylic acid (generic name quinclorac), (1RS, 2SR, 4SR) −
1,4-epoxy-p-mens-2-yl 2-methylbenzyl ether (generic name synmethrin), 2-methylthio-4,6-bis (ethylamino) -s-triazine (generic name cimetrin), O, O -Diisopropyl-2
-(Benzenesulfonamido) ethyldithiophosphate (generic name SAP), 2-methylthio-4-ethylamino-6- (1,2-dimethylpropylamino) -s-triazine (generic name dimetamethrin), 2-methylthio-
4,6-bis (isopropylamino) -s-triazine (generic name promethrin) 2-amino-3-chloro-1,4-naphthoquinone (generic name ACN), 2-methyl-4-chlorophenoxybutyric acid (generic name MCPB) ) 2-Methyl-4-chlorophenoxyacetic acid (generic name MC
P) 2 ', 3'-dichloro-4-ethoxymethoxybenzanilide, 1- (2-chlorobenzyl) -3- (α, α-
Dimethylbenzyl) urea, N- [2 '-(3'-methoxy) -thienylmethyl] -N-chloroaceto-2,6-
Dimethylanilide.

The proportions of the compound (1) and the compound (2) used in the present invention can be appropriately selected within a range that does not substantially impair the performance of each agent. For example, 1 part by weight of the compound (1) is 1 to 50 parts by weight of the compound (2).
The use ratio in the range of 0 parts by weight, and more preferably in the range of 10 to 150 parts by weight, is good. In order to prepare the herbicidal preparation for paddy field of the present invention containing the above-mentioned active ingredient compound, various auxiliary agents can be further contained, and the herbicide can be prepared according to a known method.

The surfactant may be any of those generally used as a wetting agent and a dispersant in agricultural chemical formulations, and anionic or nonionic surfactants are mainly used. The specific enumeration is as follows. As the anionic surfactant, various polycarboxylic acid salts, alkylnaphthalenesulfonic acid salts, alkylnaphthalenesulfonic acid salt formalin condensates, ligninsulfonic acid salts, alkylbenzenesulfonic acid salts, dialkylsulfosuccinic acid salts, lauryl sulfuric acid ester salts, Examples thereof include polyoxyethylene alkyl ether sulfate ester salt, polyoxyethylene alkylaryl ether sulfate ester salt, condensed phosphate salt and the like. Examples of nonionic surfactants include polyoxyethylene alkyl ether, polyoxyethylene alkylaryl ether, polyoxyethylene alkylaryl phenyl ether, polyoxyethylene sorbitan fatty acid ester, and polyoxyethylene polyoxypropylene glycol.

These surfactants may be used alone or in combination of two or more. Further, if necessary, a binder, an absorbent fine powder, a decomposition inhibitor, a colorant, etc. can be used.

[0012]

EXAMPLES Next, examples of the preparation of the present invention will be specifically described, but the present invention is not limited thereto. The following parts mean parts by weight. Example 1 Granule Compound (1) ─────── 0.07 parts Compound (2) ─────── 3 parts DBSN ──────── 3 parts Epoxidized soybean oil ───── ── 1 part Bentonite ─────── 30 parts Talc ─────── 62.93 parts Evenly mix and grind the above, add a small amount of water and knead, granulate with an extrusion granulator, After granulation, it was dried to obtain granules.

The above DBSN means sodium dodecylbenzene sulfonate, and is the same in the following compounding examples. Example 2 Granules Compound (1) ─────── 0.05 parts Compound (2) ─────── 4 parts Oxadiazone ──────── 1.5 parts DBSN ──────── 3 Part Epoxidized soybean oil ─────── 1 part bentonite ──────── 30 parts talc ──────── 60.45 parts The above is uniformly mixed and ground, and a small amount of water is added and kneaded. Then, it was granulated by an extrusion granulator and dried after granulation to obtain granules.

Example 3 Wettable powder Compound (1) ─────── 0.5 part Compound (2) ──────── 35 parts Diklite PFP ─────── 56.5 parts (Kaolin clay : Siglite Co., Ltd. product name) Zolpol 5039 ──────── 2 parts (wetting dispersant: Toho Chemical Co., Ltd. product name) Epoxidized soybean oil ──────── 2 parts Carplex ─ ────── 4 parts (White carbon: trade name of Shionogi Pharmaceutical Co., Ltd.) The above was uniformly mixed and pulverized to obtain a wettable powder.

Example 4 Flowable Compound (1) ─────── 0.4 parts Compound (2) ──────── 32 parts Oxadiazone ──────── 8 parts Agrisol S-710 ─── ── 10 parts (Nonionic surfactant: Kao Atlas Co., Ltd. trade name) Lunox 1000C ────── 0.5 parts (Anionic surfactant: Toho Chemical Co., Ltd. trade name) 1% Rhodopol water ─ ────── 20 parts (Powdering agent: Ronne Poulein Co., Ltd. trade name) Ethylene glycol ─────── 10 parts Water ─────── 19.1 parts Mix to make a flowable agent.

Next, a test example is shown in which, when the compound (1) and the compound (2) are mixed, the effects exceeding the effects expected from the effects of the single agents are shown. Test Example 1 Paddy soil was packed in a plastic pot of 1 / 5,000 are, and water was added so that the water depth would be 4 cm after scraping. Three germinating tubers of Koukirataga or Shiizumi were placed on each pot and the drug was administered on the third day. The compound (1) and the compound (2) are made into a wettable powder suspension and diluted with water to a predetermined concentration,
1 ml of the suspension was dropped into water. These pots were placed in a greenhouse and grown.

On the 27th day after the treatment, the above-ground fresh weight of the Japanese red chipper or Shiizumi was measured, and the inhibition rate was calculated from the following formula. Individual active compounds often exhibit their respective herbicidal activities, but in that case, the herbicidal activity when two active compounds are combined is the simple sum of the respective activities of the two compounds ( When it is larger than the expected activity), this is called synergism. The expected activity of a particular combination of two herbicides can be calculated as follows. (Calculation of Synergistic and Antagonistic Responses of Colby SR Herbicide Combinations, see Weed, Vol. 15, paragraphs 20-22, 1967) α: Inhibitory rate when herbicide A was treated with (a) kg / ha.

Β: Inhibitory rate when herbicide B is treated with (b) kg / ha. E: Inhibitory rate expected when herbicide A was treated with (a) kg / ha and herbicide B with (b) kg / ha. That is, it can be said that the combined activity exhibits a synergistic effect if the actual inhibition rate is larger than the above calculation.

The results are shown in Tables 1 and 2. In addition,
The symbols in the table indicate the following. A: Koukigara, B: Shizui Table 2 Measured and expected values of herbicidal effects of admixtures (inhibition rate,%) ────────────────────── Treatment of each active ingredient AB Quantity Actual Actual (g / a) Waiting Waiting Waiting Value Value Value ────────────────────── Compound (1) + Compound (2) 0.05 + 5 72 57 58 43 0.05 + 10 99 78 88 70 0.05 + 20 100 96 100 94 0.1 + 5 100 84 100 81 0.1 + 10 100 92 100 90 0.1 + 20 100 98 100 98 0.2 + 5 100 98 100 92 0.2 + 10 100 99 100 96 0.2 + 20 100 100 100 99 ────────────────────── (In the table, the expected value is the value obtained from the Colby equation in the previous term. From the results in Table 1, it is clear that the mixture of the compound (1) and the compound (2) shows an effect exceeding the expected value, and acts synergistically on the cyperaceae, Scutellaria baicalensis and Shiizumi. is there. Next, the herbicidal effect of the granules obtained in the examples was performed by the following method.

Test Example 2 Herbicidal effect and phytotoxicity test Paddy soil was filled in a 40 cm × 47 cm × 23 cm (height) plastic container, and after substituting, a flooding condition of 4 cm was applied. to this,
Soybean, firefly, eel, and yellow sedge were sowed, and tubers of Urikawa, Spodoptera litura, and Shiizu were planted. At the same time, 8 rice seedlings were planted at a depth of 2 cm per pot,
It was grown in a greenhouse. Five days after the transplantation, the granules of Example 1 and Example 2 were applied to the water surface of each plastic.

On the 25th day after the treatment, the effects on each weed and paddy rice were evaluated according to the following criteria. Criteria 5: Complete death or suppression of 90% or more 4: Suppression of 70 to 90% 3: Suppression of 40 to 70% 2: Suppression of 20 to 40% 1: Suppression of 5 to 20% 0: 5% or less Suppression The degree of suppression was determined by visual observation.

The results are shown in Table 3. The symbols in the table indicate the following. A: rice, B: novier, C: firefly, D: eel,
E: Yellow cypress, F: Urikawa, G: Mizugaya,
H: Shizui Table 3 Herbicidal effect and phytotoxicity to paddy rice ────────────────────────────── Granules ABCD EF GH treatment dose (g / a) ───────────────────────────── Example 1 300 0 4 5 5 5 5 5 5 5 ───────────────────────────── Example 2 300 0 5 5 5 5 5 5 5 5 ───────── ─────────────────────

[0023]

INDUSTRIAL APPLICABILITY The present invention can effectively control harmful perennial weeds, especially Cyperaceae weeds in a paddy field by mixing two kinds of known herbicidal active ingredients.

Claims (1)

[Claims] 1. A compound represented by the formula (1) and a compound represented by the formula (2):
The herbicidal composition containing the compound represented by these as an active ingredient. [Chemical 1]