JPH0511087B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is based on the general formula (): [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 derivatives represented by S-(4-chlorobenzyl)-N,N-diethylthiol carbamate (hereinafter referred to as benchocarb), S-ethyl-N,N-hexamethylenethiol carbamate (hereinafter referred to as molinate) ),
One type of S-1-ethyl-propyl-N,N-hexamethylenethiol carbamate (hereinafter referred to as Viram) and S-isopropyl-N,N-hexamethylenethiol carbamate (hereinafter referred to as isopropylate). 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 drugs with better control properties, and in particular, herbicides for agricultural and horticultural use can selectively control only target weeds at low doses without causing chemical damage to cultivated crops. However, existing drugs do not necessarily meet this requirement. The compound represented by the general formula () has an excellent control effect at a lower dose than conventional control agents, and is highly safe against 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. Also, the conventionally known bentiocarb,
Molinate, virum, or isopropylate have been used in higher dosages than the compound represented by the general formula () against weeds, annual weeds, and firefly, but as a result, perennial weeds that are difficult to control with these agents have been used. improvement is desired. The present inventor conducted research to increase the herbicidal effect of the compound represented by the general formula (), and found that when the conventionally used herbicide is added to the compound represented by the general formula (), They completed the present invention by discovering that the herbicidal effects of each herbicide are not merely additive, but also exhibit a synergistic herbicidal effect. This synergistic effect is large, and the composition of the present invention does not cause any phytotoxicity to rice.
The usefulness of the present invention is extremely large because it can completely control wild grasses, annual weeds, and perennial weeds with a low dosage. In addition, the synergistic effect of the herbicidal effect on barnyard grass is particularly remarkable, and by the above-mentioned mixed application, it is also possible to reduce the amount of the conventionally used herbicides contained in the composition of the present invention, and it is extremely effective. Highly 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 useful for 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. The composition according to the present invention generally contains 0.001 to 50 parts by weight of the compound represented by the general formula () per part by weight of bentiocarb, molinate, viram or isopyropyrate, preferably from 0.001 to 50 parts by weight, depending on the relative activities of each component. contains 0.001 to 10 parts by weight. In many cases, the greatest advantage of the combined herbicides of the present invention is when the proportion of compounds of the formula () is relatively low compared to other herbicides, e.g. The compound represented by is 0.001~
Obtained at 0.1 part 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 solid or liquid diluent. Preferably, the composition further comprises a surfactant. Next, Table 1 shows representative examples of compounds represented by the general formula () in the present invention. Although the following compounds are included in the compounds represented by the general formula (), the compounds represented by the general formula () 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. (Calculation of synergistic and antagonistic reactions of colby SR herbicide combinations, see Weed, Vol. 15, pp. 20-22, 1967) E=α+β−α・β/100 α: Amount of herbicide A in aKg/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, dosage amounts, dosage forms, etc. 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 ...0.1 part isopropylate ...10 parts bentonite ...50 parts talc ...39.9 parts After uniformly mixing and pulverizing the above, add a small amount of water and stir and knead. It is granulated using an extrusion type granulator and dried to form granules. Formulation example 2 Granule Compound No. 2 ...0.2 parts Molinate ...10 parts Bentonite ...50 parts Talc ...39.8 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 3 Granule Compound No. 4 ...0.07 parts Molinate ...8 parts Bentonite ...40 parts Talc ...51.93 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 4 Granule Compound No. 8 ...0.07 parts Viram ...7 parts Bentolite ...50 parts Talc ...42.3 parts After uniformly mixing and pulverizing the above, add a small amount of water and mix and knead. It is granulated using an extrusion type granulator and dried to form granules. Formulation example 5 Granule Compound No. 8 ...0.1 part bentocarb ...8 parts bentonite ...40 parts talc ...51.9 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 6 Granules Compound No. 2 ...0.1 part bentocarb ...7 parts bentonite ...50 parts talc ...42.9 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 7 Granule Compound No. 7 ...0.2 parts Viram ...10 parts Bentonite ...40 parts Talc ...49.8 parts The above is mixed and ground evenly, then a small amount of water is added, stirred and kneaded, and extruded. Granulate with a type granulator and dry to make granules. Formulation example 8 Granule Compound No. 3 ...0.1 part isopropylate ...10 parts bentonite ...50 parts talc ...39.9 parts After uniformly mixing and pulverizing the above, add a small amount of water and stir and knead. It is granulated using an extrusion type granulator and dried to form granules. Formulation example 9 Granule Compound No. 5 ...0.2 parts Molinate ...10 parts Bentonite ...50 parts Talc ...39.8 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 10 Granules Compound No. 9 ...0.07 parts Molinate ...8 parts Bentonite ...40 parts Talc ...51.93 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Formulation example 11 Granule Compound No. 4 ...0.07 parts Viram ...7 parts Bentonite ...50 parts Talc ...42.3 parts The above are mixed and ground evenly, then a small amount of water is added, stirred and kneaded, and extruded. Granulate with a type granulator and dry to make granules. Formulation example 12 Granules Compound No. 6 ...0.1 part bentocarb ...8 parts bentonite ...40 parts talc ...51.9 parts After uniformly mixing and pulverizing the above, add a small amount of water, stir, mix, and extrude. Granulate with a type granulator and dry to make granules. Test Example 1 Weeding effect test under flooded conditions After placing alluvial soil in a 1/5000 are Wagner pot, add water and mix to create a freshwater condition 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℃
Grow plants at room temperature, 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... 40-69% 2... Weed killing rate 20-39% 1... Weed killing rate 5-19% 0 ...Weed killing rate 5% or less (virtually ineffective) However, the above weed killing rate was determined by the following formula by measuring the amount of above-ground grass in the chemical-treated area and the above-ground grass species in the untreated area. It is. 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] Comparative Example 2 Synergistic effect test on barnyard millet A polyethylene pot with an inner diameter of 8 cm was filled with paddy soil, Japanese millet was grown in the paddy field, and at the third leaf stage of barnyard millet, each prescribed drug formulated into granules was submerged in water. 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 copies

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[Table] In the table, the calculated values indicate the expected values obtained from 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 (): [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 S-(4-chlorobenzyl)-N,N-diethylthiol carbamate, S-ethyl-N,N-hexamethylenethiol carbamate, S-1-ethyl-propyl-N,N - A herbicidal composition comprising as an active ingredient one of hexamethylenethiol carbamate and S-isopropyl-N,N-hexamethylenethiol carbamate.