JPS6157507A - Herbicide composition - Google Patents

Abstract

PURPOSE:To provide a herbicide composition containing a specific pyrazolesulfonylurea derivative and bensulide, piperophos, etc., exhibiting synergistic activity, and capable of completely controlling cockspur-grass, annual weeds and perennial weeds at a low dose. CONSTITUTION:The objective composition contains (A) the compound of formula (A is lower alkyl; B is halogen or lower alkoxy; R is lower alkyl; X and Y are lower alkyl or lower alkoxy; Z is CH or N) and (B) O,O-diisopropyl-S-(2-benzenesulfonylaminoethyl)-phosphorodithioate (bensulide), N-(O,O-diisopropyl-dithiophosphoryl-acetyl)-2-methyl-piperidine (piperophos), or S-[N-(4-chlorophenyl)-N-isopropylcarbamoylmethyl]-O,O-dimethyl-dithiop hosphate. The amount of the component A is 0.001-50pts., preferably 0.001-10pts. per 1pt. of the component B.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (I): [In the formula, ^ represents a lower alkyl group. B represents a halogen atom or a lower alkoxy group, and R represents a lower alkyl group. X and Y each independently represent a lower alkyl group or a lower alkoxy group. 2 represents a C)I group or a nitrogen atom. ] A pyrazole sulfonylurea derivative represented by and 0.0
-diisopropyl-3-(2-benzenesulfonylaminoethyl)-phosphorodithioate (hereinafter referred to as bensulide), 0-ethyl-〇-(2-nitro-4-methyl-phenyl)-N-sec-butylphosphoro amidothioate (hereinafter referred to as Butamitsuos), 0-ethyl-〇-(2-nitro-4-methyl-phenyl)-N-isopropylthionophosphoroamidate (hereinafter referred to as amiprophos), N-(0, 0-diisopropyl-dithiophosphoryl-acetyl)-2-methyl-piperidine (hereinafter referred to as piperophos) or S-(N-(4-chlorophenyl)-N-isopropylcarbamoylmethyl)
-0,0-dimethyl-dithiophosphate (hereinafter HOE
It is called 574. ) 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 excellent herbicidal properties, and in particular, as herbicides for agriculture and horticulture, they are needed to selectively target only target weeds without causing chemical damage to cultivated crops, and with low chemical It is desirable to be able to control the disease through quantitative control, but existing agents 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. 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 benzuride, butamitsuosu, amiprotsumesu, piperofos or HOE574
has been used in higher doses than the compound represented by formula (I) against weeds and annual weeds, but this has resulted in an increase in perennial weeds that are difficult to control with these chemicals.
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)
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 can also be used for various grains other than rice, and can be used to control various weeds in agricultural and horticultural fields such as fields and orchards, as well as non-agricultural JJF areas such as playgrounds, vacant lots, forest lands, tank yards, and railway edges. It can also be applied to plants 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 formula (I) per part by weight of bensuride, butamitsuosu, amiprofos, piverofos or HOE574, depending on the relative activity of each component. ■ Department,
The weight is preferably 0.001 to 10 times. In many cases, the greatest advantage of the combined herbicide of the invention is the formula ('r)
When the proportion of the compound represented by formula (1) is relatively lower than that of other herbicides, for example, when the compound represented by formula (1) is 0.001 to 0.1 part by weight per 1 part by weight of other herbicides. can be 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 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, representative examples of compounds represented by the general formula (N) in the present invention are shown in Table 1. Although the following compounds are included in the compounds represented by the general formula (I), 1
) The compounds represented by these are not limited to these.

Table 1 Me: Methyl group 1 miL: Ethyl group In many cases, 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 When the activity of two compounds is greater than the pure sum of their respective activities (expected activities), 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 rWeedJ vol. 15, pp. 20-22, 1
967) α: Inhibition rate when herbicide A is treated at a Kg/ha amount β: Suppression rate when herbicide B is treated at bKc/ha amount E: Herbicide A at a Kg/ha /ha% If the expected inhibition rate when herbicide B is treated at bKg/haO, 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.

Formulation example 1 Granule compound point 4 -・---------0.2 parts HO
E574 1 part bentonite ------- 50
Part talc −・・−・−−−−−−・−・4
8.8 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.

Formulation example 2 Granule compound point 5 -------・-・-・・0.1
Part Amiprophos 3 parts Bentonite -・-・--・--・--49, 9 parts Talc
・・・・・−−−−・〜−−−−−−− After uniformly mixing and pulverizing 47 parts or more, adding a small amount of water, stirring and kneading, granulating with an extrusion granulator, and drying. and make into granules.

Granule compound NcL1 ・・・・−・−・−・−・
0.1 part Piberophos - Curved surface - 4,4 parts Bentonite - 50 parts Talc
−・−・・−・・−45. After uniformly mixing and pulverizing 5 parts or more, adding a small amount of water, stirring and kneading, granulating with an extrusion type granulator, and drying to form granules. do.

Formulation example 4 Granule compound compound 7 ・-・-・-0, 1 part HOE57
4 −・・・−−−−−・ 1.5 parts bentonite −・−・・・−・・−・ 50 parts talc
−・−・・−−−−−・−・−47, 5 or more are mixed and pulverized uniformly, then a small amount of water is added, stirred and kneaded, granulated with an extrusion type granulator, and dried. and make into granules.

Formulation example 5 Granules.

Combined dynamic magnetism 2 −・・−−−−−−−−・0.15
Part bensuride 9 parts Bentonite ------50 parts Talc------------- Mix and grind at least 40.85 parts uniformly, then add a small amount of water. The mixture is stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

``Basic 1 Shin'' - Granule Compound Dynamic Magnetism 3 ・---------------... 0.
Part 1 Butamiphos −・−・・−・−・ 3
Part bentonite -・-・---- Then, it is granulated using an extrusion type granulator and dried to form granules.

Formulation example 7 Granule compound dynamic magnetic 9 ----------・0.1
5 parts Bensuride ・−・−−−−−−1, 5 parts Bentonite ・・・−・・・・・・・−・−・
50 parts talc ・−・−・−・48.3
At least 5 parts are uniformly mixed and pulverized, then a small amount of water is added, stirred and kneaded, granulated using an extrusion granulator, and dried to form granules.

Plate 5l Granule Compound N16 -------------・0
．． 1 part piperophos −・・・−−−−−−4,
4s bentonite ・・・－・－・・・・・・－・
50 parts talc ・−・−・−・ 45.5
After uniformly mixing and pulverizing more than one part, a small amount of water is added, the mixture is stirred and kneaded, and the mixture is granulated using an extrusion granulator and dried to form granules.

Formulation example 9 Wettable powder compound 111t18 ・・−・−・−・−・
−・0.3 parts Butamiphos・・−1−−−・
・−・−・−・40 Zikrite A −・・−・・−
-----・55.7 parts (Kaolin clay: Seek Light Kogyo A Zero product name) Tsurupol 5039・---
---1.--1--2 parts (Mixture of nonionic surfactant and anionic surfactant: Toho Chemical 9 Part brand name) Carplex (anti-caking agent)--2 (white carbon: Shionogi & Co., Ltd. trade name) or more is mixed and ground uniformly to make a wettable powder.

Weeding effect test under flooded conditions on charcoal 115000
After putting alluvial soil in Earl's Hugner pot, 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 grasshopper, Japanese aphrodisiac), and firefly were mixedly sown in the above-mentioned pots, and tubers of Japanese grasshopper, Japanese cypress, and black bream were also placed in the beds. Furthermore, rice seedlings at the 2.5 leaf stage were transplanted. 25-3 pots
Plants were grown in a greenhouse at 0° C., and 10 days after sowing, at the 1.5-leaf stage, a diluted drug solution was dropped onto the water surface using a volumetric pipette at a predetermined dose.

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 to 19% 0--Weed killing rate 5% or less None) 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 3 (Continued) Kokyomon 1 Synergistic effect test on barnyard millet A polyethylene bot with an inner diameter of 8 cm was filled with paddy soil, and Japanese millet was grown in the paddy field. The drug was applied to flooded soil. The pots are placed in a greenhouse at 25-30℃ for controlled cultivation, and after treatment
The above-ground fresh grass weight of the barnyard grass remaining in the daily harvest and the above-ground fresh 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.

Rating Weed killing rate OO ~ 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% Table 4 Table 5 Table 5 (Continued) Table 5 (Continued) In the table, the calculated values indicate the expected values obtained from the Co1by formula.

As is clear from the above table, the composition of the present invention has not only the pure sum of the activities of the compound represented by formula (1) and the conventionally known herbicides, but also a greater synergistic herbicidal activity. Furthermore, target weeds can be selectively and completely controlled 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, and R represents a lower alkyl group. X and Y each independently represent a lower alkyl group or a lower alkoxy group. Z represents a CH group or a nitrogen atom. ] Pyrazole sulfonylurea derivative represented by O, O
-diisopropyl-S-(2-benzenesulfonylaminoethyl)-phosphorodithioate, O-ethyl-O-
(2-nitro-4-methyl-phenyl)-N-sec-
Butyl phosphoramidothioate, O-ethyl-O-(
2-Nitro-4-methyl-phenyl)-N-isopropylthionophosphoroamidate, N-(O,O-diisopropyl-dithiophosphoryl-acetyl)-2-methyl-
piperidine or S-[N-(4-chlorophenyl)-
1. A herbicidal composition comprising one of N-isopropylcarbamoylmethyl]-O,O-dimethyl-dithiophosphate as an active ingredient.