JPH0511090B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to the general formula I: [In the formula, A represents a lower alkyl group. B represents a halogen atom or a lower alkoxy group. R represents a lower alkyl group. Z represents a nitrogen atom or a CH group. X and Y each independently represent a lower alkyl group or a lower alkoxy group. ] Pyrazolesulfonylurea derivative represented by and S-(1methyl-1-phenethyl)-piperidine-
1-carbothioate (hereinafter referred to as MY-93)
The present invention relates to a herbicidal composition containing as an active ingredient. As a result of many years of research and development into herbicides, a wide variety of herbicides have been put into practical use, and these herbicides have contributed to labor-saving weed control operations and improved productivity of agricultural and horticultural crops. Even today, there is a demand for the development of new chemicals with better herbicidal properties, and in particular, as herbicides for agriculture and horticulture, they are used to selectively control only target weeds at low doses without causing harm to cultivated crops. However, existing drugs do not necessarily meet this requirement. The compound represented by the general formula I exhibits excellent herbicidal effects at lower doses than conventional herbicides, and is highly safe for rice. In addition, it is highly effective not only against annual grass weeds and annual broad-leaved weeds, but also against perennial weeds, making it highly useful. In addition, MY-93, which has been known for a long time, has been used in higher dosages than the compound represented by general formula (I) against annual weeds, but as a result, it is difficult to control it with future chemicals. This has led to an increase in perennial weeds, and improvement is desired. The present inventor conducted research to increase the herbicidal effect of the compound represented by the general formula (I), and found that the compound represented by the general formula (I) has MY-93
The present invention has been completed by discovering that when these two herbicidal effects are combined, the herbicidal effects of each are not only additive, but also a synergistic herbicidal effect appears. This synergistic effect is great, and the composition of the present invention can completely control all types of weeds, from annual weeds to perennial weeds, with a low dosage without causing any phytotoxicity to rice, and the usefulness of the present invention is extremely large. Furthermore, the synergistic herbicidal effect on barnyard grass is particularly remarkable, and by the above-mentioned mixed application, it is also possible to reduce the amount of MY-93 contained in the composition of the present invention, which is extremely useful. In addition, the herbicide composition of the present invention is effective even when treated before and after weed germination, and is effective in soil treatment,
High effects can be obtained by treating the leaves and soil as well. It is also effective against various grains other than rice, and can also be used to control various weeds in agricultural and horticultural fields such as fields and orchards, as well as in non-agricultural areas such as playgrounds, vacant lots, forest areas, tank yards, and railway edges. It can be applied and shows great economic effects in weed control. Depending on the relative activity of each component, the composition according to the present invention generally contains 0.001 to 50 parts by weight, preferably 0.001 to 10 parts by weight of the compound represented by formula I per 1 part by weight of MY-93. Contains. In many cases, the greatest advantage of the combined herbicide of the invention is when the proportion of compounds of formula (I) is relatively lower than that of MY-93, e.g. The compound represented by is 0.001 to 0.1
Obtained when parts by weight. The amount of mixture to be applied will depend on a number of factors, such as the particular species of target plant to be inhibited, but generally amounts of 0.001 to 10 Kg/ha are usually adequate. Those skilled in the art can readily determine appropriate usage rates by routine, standardized tests without the need for extensive experimentation. The compositions of the invention are preferably used in the form of a composition in which the active ingredient is mixed with a carrier consisting of a fixed or liquid diluent. Preferably, the composition further comprises a surfactant. Next, Table 1 shows representative examples of the compounds represented by the general formula (I) in the present invention. Although the following compounds are included in the compounds represented by general formula (I), the compounds represented by general formula (I) are not limited to these.

[Table] Individual active compounds often exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity of a combination of two active compounds is simply the same as the activity of each of the two compounds. When the total activity is greater than the expected activity, this is called synergism. The expected activity of a particular combination of two herbicides can be calculated as follows. (See Colby SR Calculation of synergistic and antagonistic reactions of herbicide combinations, "Weed" Vol. 15, Sections 20-22, 1967) E = α + β - α · β / 100 α: Amount of herbicide A in kg/ha Inhibition rate β when treated with herbicide B: Inhibition rate E when treated with herbicide B at an amount of bKg/ha: herbicide A at aKg/ha, herbicide B at bKg/ha
In other words, if the actual inhibition rate is greater than the above calculation, it can be said that the combined activity exhibits a synergistic effect. Hereinafter, the present invention will be explained in more detail with reference to Examples, but the compounds, formulation amounts, and dosage forms in the present invention are not limited to the Examples. In addition, all "parts" mean parts by weight. Formulation example 1 Granule Compound No. 1 ...0.07 parts MY-93 ...8 parts bentonite ...40 parts talc ...51.93 parts Mix the above evenly in a powder frame, then add a small amount of water and stir and knead. Then, it is granulated using an extrusion type granulator and dried to form granules. Formulation example 2 Granule Compound No. 2 ...0.2 parts MY-93 ...10 parts Bentonite ...50 parts Talc ...39.8 parts Mix the above ingredients evenly in a powder frame, then add a small amount of water and stir and knead. Then, it is granulated using an extrusion type granulator and dried to form granules. Formulation example 3 Granule Compound No. 3 ...0.1 part MY-93 ...10 parts bentonite ...40 parts talc ...49.9 parts Mix the above evenly in a powder frame, then add a small amount of water and stir and knead. It is then manufactured using an extrusion type granulator and dried to form granules. Formulation example 4 Granule Compound No. 4 ...0.07 parts MY-93 ...8 parts bentonite ...40 parts talc ...51.93 parts Mix the above evenly in a powder frame, then add a small amount of water and stir and knead. Then, it is granulated using an extrusion type granulator and dried to form granules. Formulation example 5 Granule Compound No. 6 ...0.2 parts MY-93 ...10 parts Bentonite ...50 parts Talc ...39.8 parts Mix the above ingredients evenly in a powder frame, then add a small amount of water and stir and knead. It is then manufactured using an extrusion type granulator and dried to form granules. Formulation example 6 Granule Compound No. 8 ...0.1 part MY-93 ...10 parts bentonite ...40 parts talc ...49.9 parts After uniformly mixing the above into a powder frame, add a small amount of water and stir and knead. Then, it is granulated using an extrusion type granulator and dried to form granules. Formulation example 7 Wettable powder compound No. 5...0.3 parts MY-93...42 parts Siegrite A (kaolin clay: brand name of Sieglite Industries Co., Ltd.)...53.7 parts Solpol 5039 (surfactant: Toho Kagaku Co., Ltd. product name)
...2 parts Carplex (anti-caking structure) (white carbon: Shionogi & Co., Ltd. trade name...2 parts) The above is uniformly mixed into a powder frame to form a wettable powder. Formulation example 8 Wettable powder compound No. 7 ...0.6 parts MY-93 ...48 parts Siegrite A (kaolin clay: brand name of Sieglite Industries Co., Ltd.) ...47.4 parts Solpol 5039 (surfactant: Toho Kagaku Co., Ltd. product name)
...2 parts) Carplex (anti-caking agent) (white carbon: trade name of Shionogi & Co., Ltd.) ...2 parts The above are uniformly mixed into a powder frame to make a wettable powder. Formulation example 9 Flowable compound No. 9...1 part MY-93...29 parts Agrisol B-710 (nonionic surfactant: Kao Astra Co., Ltd. trade name)...5 parts Lunox 1000C (anionic surfactant) Agent: Toho Chemical Co., Ltd. (trade name)...0.5 parts 1% Rhodopol water (thickener: Lorne Poulenc brand name...20 parts) Water...44.5 parts Mix the above evenly to make a flowable agent . Formulation example 10 Flowable compound No. 4 ...5 parts MY-93 ...20 parts Agrisol B-710 (nonionic surfactant: Kao Atlas Co., Ltd. trade name) ...10 parts Lunox 1000C (anionic surfactant) Agent: Toho Chemical Co., Ltd. (trade name) 0.5 parts 1% Rhodopol water (Thickener: Lorne-Poulenc trade name) 20 parts water 44.5 parts Mix the above uniformly to make a flowable agent . Test Example 1 Weeding effect test under flooded conditions After putting alluvial soil in a 1/500 are Wagner pot, add water and mix to create freshwater conditions with a water depth of 2 cm. Seeds of Japanese millet, broad-leaved weeds (Japanese violacea, azalea, azalea, and bulrushes),
The seeds were mixedly sown in the above pots, and tubers of Urikawa, Mizugaya cypress, and Kurogwai were also placed in beds. moreover
Rice seedlings at the 2.5 leaf stage were transplanted. Pot at 25-30℃
Plants were grown in a greenhouse, and 10 days after sowing,
When the Japanese millet was at the 1.5-leaf stage, a diluted solution of the drug was dropped onto the water surface using a volumetric pipette in a predetermined amount. Three weeks after dropping the chemical solution, the herbicidal effect on various weeds was investigated according to the following criteria. The results are shown in Tables 2 and 3. Judgment criteria 5...Weed killing rate 90% or more (almost complete death) 4...Weed killing rate 70-89% 3...Weed killing rate 40-69% 2...Weed killing rate 20-39% 1...Weed killing rate 5-19 % 0...Weed killing rate 5% or less (almost ineffective) However, the above weed killing rate is calculated by the following formula by measuring the above-ground grass weight in the chemical-treated area and the above-ground grass weight in the untreated area. It is something that Weed killing rate = (1 - above-ground grass weight in treated area / above-ground grass weight in non-treated area) x 100

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[Table] Test Example 2 Synergistic effect test on barnyard millet A polyethylene pot with an inner diameter of 8 cm was filled with paddy soil, and Japanese millet was grown in the paddy field, and during the three-leaf stage of barnyard millet, it was filled with each prescribed drug formulated into granules. Water and soil treated. The pots were kept at a room temperature of 25 to 30°C for controlled cultivation, and 30 days after treatment, the weight of the above-ground grass of the remaining barnyard grass and the weight of the above-ground grass in the untreated area was measured to determine the weed killing rate. It was calculated and judged according to the following criteria. The results are shown in Tables 4 and 5. Score Weed killing rate 0 0-9% 1 10-19% 2 20-29% 3 30-39% 4 40-49% 5 50-59% 6 60-69% 7 70-79% 8 80-89% 9 90 ~99% 10 100%

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[Table] In the table, the calculated values indicate the expected values obtained from the Colby's formula. As is clear from the above table, the composition of the present invention has greater synergistic herbicidal activity than the simple sum of the respective activities of the compound represented by the general formula () and the conventionally known herbicide. Furthermore, it is possible to selectively and completely control target weeds with a low dosage.

Claims (1)

[Claims] 1 General formula I: [In the formula, A represents a lower alkyl group. B represents a halogen atom or a lower alkoxy group. R represents a lower alkyl group. Z represents a nitrogen atom or a CH group. X and Y each independently represent a lower alkyl group or a lower alkoxy group. ] A herbicidal composition comprising a pyrazolesulfonylurea derivative represented by the following and S-(1-methyl-1-phenethyl)-piperidine-1-carbothioate as active ingredients.