JPS6045505A - Herbicidal composition - Google Patents

Abstract

PURPOSE:A herbicidal composition obtained by blending a specific pyrazolesulfonylurea derivative and S-(1-methyl-phenetyl)-piperidine-1-carbothioate, showing synergistic effects, effective with a small amount of it used. CONSTITUTION:A herbicidal composition obtained by combining a pyrazolesulfonylurea derivative shown by the formula (A is lower alkyl; B is H, or lower alkyl; R is lower alkyl; X and Y are lower alkyl, or lower alkoxy) (e.g., a compound wherein A, B, R, and X are all Me, and Y is OMe, etc.) with S-(1-methyl- 1-phenetyl)-piperidine-1-carbothioate in a weight ratio of (0.001-10):1. The composition has no phytotoxicity to paddy rice plants, and can control completely Echinochloa crus-galli Beauv. var. praticola Ohwi., weeds from annual to perennial weeds with a small amount of it used.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (I): [In the formula, A represents a lower alkyl group. B represents a hydrogen atom or a lower alkyl group. R represents a lower alkyl group. X
and Y each independently represent a lower alkyl group or a lower alkoxy group. ] Pyrazole sulfonylurea derivative represented by and 5-(
The present invention relates to a herbicidal composition containing 1-methyl-1-phenethyl)-piperidine-1-carbothioate (hereinafter referred to as MY-93) 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 (1) exhibits excellent herbicidal effects at lower dosages than conventional herbicides, and has high safety against rice. In addition, it is highly effective not only against grassy grass weeds and broad-leaved weeds, but also against perennial weeds, making it highly useful.

In addition, MY-9, 3, which is known from the past, is Nobie, -
Compounds represented by formula (1) have been used against annual weeds in higher doses than the compounds represented by general formula (1), but as a result, there has been an increase in perennial weeds that are difficult to control with these chemicals, and improvement is desired. It is rare.

The present inventor conducted research to increase the herbicidal effect of the compound represented by the general formula (1), and found that the compound represented by the general formula (1)
The present invention was completed by discovering that when MY-93 is blended with the compound represented by the formula, the herbicidal effects of each compound are not only additive, but also a synergistic herbicidal effect appears. This synergistic effect is large, and the composition of the present invention does not cause any phytotoxicity to rice, and can completely control all types of weeds, from wild weeds to annual weeds to perennial weeds, with a low dosage, and the usefulness of the present invention is extremely large. . Furthermore, the synergistic herbicidal effect particularly on barnyard grass is 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.

Furthermore, the herbicidal composition of the present invention is effective even when treated before and after weed germination, and is highly effective when treated with soil or with both foliage and soil. 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. applicable,
Shows great economic effect 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 of the compound represented by the general formula (I>) per 1 part by weight of MY-93, preferably 0. ．．
001 to 10 parts by weight.

In many cases, the greatest advantage of the combined herbicide of the present invention is that the formula (1
) is obtained when the proportion of the compound represented by is relatively lower than that of MY-93, for example, when MY, -,93 is 0.001 to 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 the compounds represented by the general formula (I) in the present invention. Although the following compounds are included in the compounds represented by the general formula (1), they are also included in the compounds represented by the general formula (1).
The compounds represented by 1) are not limited to these.

Table 1 Me: Methyl group Et: Ethyl group There are many combinations in which individual active compounds exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity when two types of active compounds are combined is This is also called synergism when the activity is greater than the simple sum of the activities of each of the species (the expected activity). The expected activity of a particular combination of two herbicides can be calculated as follows.

(Colby S, R, Calculation of synergistic and antagonistic responses of herbicide combinations rWeedJ 15620-22,
Let's go back to 1967!嘱) α: Suppression rate when herbicide A is treated at a Kg/ha amount β: Suppression rate E when herbicide B is treated at bKg/ha: Herbicide A at a Kg/ha, herbicide B bag/ha
If the expected inhibition rate, that is, the actual inhibition rate when treated with the amount of tl), is thicker than the above calculation, it can be concluded that the activity by the combination of G) shows a synergistic effect.

Hereinafter, the present invention will be explained in more detail with reference to Examples.
Compounds, formulation amounts, series, etc. (not limited to examples only) in the present invention.

In addition, all "parts" mean parts by weight.

Compound No. 6---0.07 part M Y-93-11----・8 parts bentonite--------=-40 parts talc
−−−−−−−−−−−− After uniformly mixing and pulverizing 51.93 parts or more, adding a small amount of water, stirring and kneading, granulating with an extrusion type granulator, and drying. Make into granules.

Aikitasu Granule Compound No. 2 ------- 0.2 parts MY-93
−−〜−−,−, 10 parts bentonite −−−−−−−, 50 parts talc −−
----------, 39.8 parts or more are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated with an extrusion type granulator, and dried to form granules. Make it.

Wokitan↓ Granule Compound No. 8, -------- 0.1 part MY
-93------10 parts bentonite----, 40 parts talc---49, 9 parts or more are uniformly mixed and ground, then a small amount of water is added. Stir, mix, and knead, granulate using an extrusion granulator, and dry to form granules.

Distribution plate Hydrating agent compound moving tooth 5 ------------- 0, 3 parts M
Y -93---42 parts Zeekrite, a, -1---53,7 parts (Kaolin clay: Zeekrite Kogyo ■Product name) Tsurupol 5039 ・--1 --- 2 parts (surfactant: Toho Chemical ■trade name) Carplex (anti-caking agent) ---2 parts (white carbon: Shionogi & Co., Ltd. ■trade name) or more are mixed uniformly. and make it into a hydrating agent.

Arrangement 1 row” - Hydrating agent compound movable tooth 7 ------- 0.6 part M Y -9
3-1111---48 part Sieglite A---
----------47,4 parts (kaolin clay:
Sieglite Industries ■Product name) Tsurupol 5039 --
−−−−−−1−−, 2 parts (surfactant: Toho Chemical ■trade name) Carplex (anticaking agent)---2 parts (white carbon: Shionogi & Co. ■trade name) or more uniformly to make a hydrating agent.

W↓ Weeding effect test under flooded conditions After putting alluvial soil in a 115,000 are Wagner Bosoto, water is added and mixed to create a freshwater condition with a water depth of 2 cm. Seeds of Japanese grasshopper, broad-leaved weeds (Japanese chinensis, azalea, and Kikashigusa) were mixedly sown in the above-mentioned pots, and tubers of Japanese cypress, Japanese cypress, and black bream were also placed in the beds. Furthermore, rice seedlings at the 2.5 leaf stage were transplanted. Plants are grown in pots in a greenhouse at 25-30°C, and 10 days after sowing, when the Japanese millet is at the 1.5-leaf stage, a diluted drug solution is dripped onto the water surface using a measuring pipette at a predetermined dose. Processed. 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.

:v': Foot standard 5- Weed killing rate 90% or more (almost completely dead) 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 (mostly ineffective) However,
The above-mentioned weed killing rate was determined by the following formula by measuring the weight of above-ground plants in the chemically treated area and the weight of above-ground plants in the non-treated area.

Table 2 Table 2 (Continued) Table 3 Mixed herbicidal effect test (herbicidal rate 2%) Table 3 (Continued) Test amount ■1 Synergistic effect test on barnyard grass Filled with paddy soil in a polyethylene pot with an inner diameter of 8 cm Then, Japanese millet was grown in paddy fields, and the flooded soil was treated with each of the prescribed drugs formulated into granules at the third leaf stage of millet. The pots were placed in a greenhouse at 25 to 30°C for controlled cultivation, and the weight of remaining above-ground grass of barnyard grass in the untreated area was determined 30 days after treatment, and the weight of above-ground grass in the untreated area was determined. The grass rate was calculated and judged according to the following criteria. The results are shown in Tables 4 and 5.
Shown in the table.

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% In the table, the calculated values are the expected values calculated from the Colby equation.

As is clear from the above table, the composition of the present invention has not only the simple sum of the activities of the compound represented by general formula (I) and the conventionally known herbicides, but also a large synergistic herbicidal activity. Furthermore, it is possible to selectively and completely control target weeds with a low dose.

Patent applicant: Nissan Chemical Industries, Ltd.

Claims (1)

[Claims] General formula (■): [In the formula, a lower alkyl group is shown. B represents a hydrogen atom or a lower alkyl group. R represents a lower alkyl group. X
and Y are each independently a lower alkyl group or 1
Indicates a grade alkoxy group. ] pyrazolesulfonylurea derivative represented by and 5-(
A herbicidal composition comprising 1-methyl-1-phenethyl)-piperidine-1-carbothioate as an active ingredient.