JPS6248604A - Herbicide composition - Google Patents

Abstract

PURPOSE:A herbicide composition showing synergistically herbicidal effects, showing improved herbicidal effects with a small amount, having high safety especially to rice plant, comprising a specific pyrazolesulfonylurea derivative with other herbicidal compound as active ingredients. CONSTITUTION:A herbicide composition containing a pyrazolesulfonylurea derivative shown by the formula (A and R are lower alkyl; B is halogen or lower alkoxy; Z is N or CH; X and Y are A, R or lower alkoxy) and one or more of S-(4-chlorobenzyl)-N,N-diethylthiolcarbamate, S-ethyl-N,N- hexamethylenethiolcarbomate, S-1-ethyl-propyl-N,N-hexamethylenethiolcarbamate and S-isopropyl-N,N-hexamethylenethiolcarbamate as active ingredients. The composition can completely control all wheeds from annual weds to perennial weds and excellent synergistic actions of herbicidal effects especially on barnyard grass.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (■): 8 [In the formula, A represents a lower alkyl group, and B represents a halogen atom or a lower alkoxy group. R represents a lower alkyl group. Z represents a nitrogen atom or CHI, and X and Y each independently represent a lower alkyl group or a lower alkoxy group. ] pyrazolesulfonylurea derivative represented by and 5-(
4-chlorobenzyl)-N,N-diethylthiol carbamate (hereinafter referred to as bentiocarb), S-ethyl-N,N-hexamethylenethiol carbamate (
Hereinafter, it will be referred to as molinate.

), 5-1-ethyl-propyl-N,N-hexamethylenethiol carbamate (hereinafter referred to as Pyram) or S-isopropyl=N,N-hexamethylenethiol carbamate (hereinafter referred to as isopropylate). The present invention relates to a herbicidal composition containing one of the following 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. Moreover, it is highly effective not only against -year-old grass weeds and -year-old broad-leaved weeds, but also against perennial weeds, making it highly useful.

In addition, conventionally known bentiocarb, molinate, pyram, or isopropylate have been used in higher doses than the compound represented by the -S formula (I) against wild grasses, annual weeds, and firefly. However, this has resulted in an increase in perennial weeds that are difficult to control with these chemicals, and improvements are desired.

The present inventor conducted research to increase the herbicidal effect of the compound represented by the general formula (1), and found that -C formula (I)
The present inventors have discovered that when the above-mentioned herbicides conventionally used are combined with the compound represented by the formula, the herbicidal effects of each herbicide are not merely additive, but also a synergistic herbicidal effect appears. .

This synergistic effect is great, and the composition of the present invention does not cause any phytotoxicity to rice, and it is possible to completely control wild weeds, annual weeds, and perennial weeds at a low dose, and the usefulness of the present invention is extremely large. . In addition, the synergistic effect of the herbicidal effect on barnyard grass is particularly remarkable, and by the above-mentioned mixed application, it is possible to reduce the amount of the conventionally used herbicides contained in the composition of the present invention, making it extremely useful. expensive.

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.

The composition according to the present invention generally contains from o, ooi to 50 parts by weight of the compound represented by the general formula (1) per part by weight of bentiocarb, molinate, pyram or isobirovirate, although it depends on the relative activity of each component. 0.00 for
It contains 1 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 relatively lower than other herbicides, for example, when the proportion of the compound represented by formula (1) is 0.001 to 0.1 part by weight per 1 part by weight of other herbicides. sometimes obtained.

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 in general amounts from 0.00 to 10 Kg/ha are usually suitable. 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 compound represented by the general formula (1) in the present invention. Although the following compounds are included in the compounds represented by the general formula (1), the compounds represented by the formula (1) at -1% are not limited to these.

Table 1 in the margin below Me: Methyl group Et: Ethyl group Individual active compounds often exhibit drawbacks in their herbicidal activity, but in such cases, the herbicidal activity when two types of active compounds are combined is When the activity of two compounds is greater than the simple sum of their respective activities (expected activity), this is called synergism. 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 rlleed J vol. 15, pp. 20-22.
(see 1967) α: Inhibition rate when herbicide A is treated in an amount of aKg/ha β: Inhibition rate when herbicide B is treated in an amount of bKg/ha E: Herbicide A) IcaKg/ha , herbicide B in bKg/
If the expected inhibition rate when treated with the amount of ha, that is, 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.
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.

51 cases of blood - Granule compound Nal ・-----o
, i part isopropylate −・−・・・・・−・ 1
0 parts bentonite ・−・−・・−・−・−・−5
0 parts of talc ------- 39.9 parts or more are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated with an extrusion granulator, and dried to form granules. Make it.

``Kan''1den'' - Granule Compound Floor 2 -----------・～・-0, 2 parts Molinate −・−・−・ 10 parts Bentonite −・・・・−・−・ 50 parts Talc
−−−−−・・−・・ After uniformly mixing and pulverizing 39.8 parts or more, adding a small amount of water, stirring and kneading, granulating with an extrusion granulator, and drying to form granules. Make it.

Formulation example 3 Granule compound! 1h4 ・・・−・−・・・・0.0
7 parts molinate 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.

Chichiki Okudo Granule Compound 8 ---1---0.07 parts Pyram 7 parts Bentonite
−−−−−−−−−・−−−−−50 parts talc
・－・・・・・・・・・－・ After uniformly mixing and pulverizing 42.3 parts or more, adding a small amount of water, stirring and kneading, granulating with an extrusion granulator, drying and granulating. Make it into a drug.

■Inspection Refreshing Granule Compound N118 ・・−・−・・−・・ 0
．． 1 part Benthiocarb 8 parts Bentonite -----------・-・・-・40 parts Talc m------------ Mix and grind 51.9 parts or more evenly, then add a small amount of water. The mixture is then stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

■Mamemasu■ Granule compound 11kL2 ・・・・・・・・・・−
0.1 part Bentocarb 7 parts Bentonite ・－・・−・・・・・・・ 5 (1 talc ・−・−−−−−・・ Mix and grind 42.9 parts or more evenly, then add a small amount of water. The mixture is stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

y Rakujiko Granule Compound Magnetic 7 -・・−・・・0.2 parts Pyram・・−・−・−10 parts Bentonite・−m=−−−−・−・・40 parts Talc
−・−・−・−・ Mix and crush 49.8 parts or more uniformly, then add a small amount of water, mix and knead, granulate with an extrusion granulator, and dry to make granules. .

Father metal ±1 Granule compound 11h3 -・--11----・
0.1 part isopropylate −・−・−・・10
39.9 parts or more of bentonite ・・〜・−・−・−s o part talc −→ 39.9 parts or more are mixed and pulverized uniformly, then a small amount of water is added, stirred, kneaded, and extruded. Granulate with a type granulator and dry to make granules.

戈B1桝J-granular compound 隘5 -・・−・−0,2 parts molinate
・－－－－・・・－io part 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. do.

Chichika Kankan Granule Compound No.9 ・−・・−・−0.07 parts Molinate 8 parts Bentonite −
−−−−−・−・−・−・ 40 parts talc
---------------... 51.93 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, dried and granulated. Make it into a drug.

■Mame Bandan Granule Compound 4 -------・-・-・0.07 parts Pyram 7 parts Bentonite
−・・−・・−・・50 parts talc
・・・－・・・－・ 42.3 parts or more are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated with an extrusion granulator, and dried to form granules. .

Star Inspection U Granule Compound Series 6 --------1-・-0, 1 part bentiocarb 8 parts bentonite
・−・−・・−・−・−・−・ 40 parts talc
-・・−・−・・− 51.9 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. do.

Weeding effect test under warm water conditions Alluvial soil was placed in a 115,000 are Hugner pot, then water was 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.

Criterion 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 ( (mostly ineffective)
However, the above-mentioned weed killing rate was determined by measuring the above-ground fresh grass weight in the chemically treated plot and the above-ground fresh grass weight in the non-treated plot as shown in 2 below.

Table 2 Table 2 (M) P: Benthiocarb Q: Molinate R: Viram S: Isopropylate Table 3 Mixed herbicidal effect test (herbicide rate 1%) Table 3 (Continued) Table 3 (Continued) 3 Table (vt) P: Benthiocarb Q: Molinate R: Viram S: Isopropylate fi 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 a paddy field, and the three-leaf stage of barnyard millet was evaluated. Each prescribed drug formulated into granules was applied to flooded soil. The pots are placed in a greenhouse at 25-30℃ for controlled cultivation, and after treatment
The above-ground grass weight of the Japanese barnyard grass remaining in the daily treatment and the above-ground grass weight of the untreated area were measured, and the weed killing rate was calculated and judged according to the following criteria. The results are shown in Tables 4 and 5.

Margin rating below: Weed killing rate OO ~ 9% Table 4 (continued) Table 4 (continued) Below margin Table 5: Mixed herbicidal effect test (weed killing rate 2%) Table 5 (Vt) Table 5 (continued) Table 5 (Continued) In the margin table below, the calculated values indicate the expected values obtained from the Colby equation.

As is clear from the above table, the composition of the present invention has greater synergistic herbicidal activity than the simple sum of the activities of the compound represented by general formula (1) and the conventionally known herbicides. Furthermore, it is possible to selectively and completely control target weeds with a low dosage.

Claims (1)

[Claims] General formula (I): ▲There are numerical formulas, chemical formulas, tables, etc.▼(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 pyrazole sulfonylurea derivative represented by and S-(
4-chlorobenzyl)-N,N-diethylthiol carbamate, S-ethyl-N,N-hexamethylenethiol carbamate, S-1-ethyl-propyl-N,N-
1. A herbicidal composition comprising, as an active ingredient, one of hexamethylenethiol carbamate and S-isopropyl-N,N-hexamethylenethiol carbamate.