JPS6045503A - Herbicide - Google Patents

Abstract

PURPOSE:A herbicide capable of controlling completely Echinochloa crus-galli Beauv. var. praticola Ohwi., annual and perennial weeds with its small amount without providing paddy rice plants with phytotoxicity, containing a pyrazolesulfonylurea derivative and oxadiazon as active ingredients. CONSTITUTION:A herbicide containing 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) and 3-(2,4-dichloro-5-isopropoxyphenyl)-5-t- butyl-1,3,4-oxadiazol-2(3H)-one (oxadiazon for short) as active ingredients. The ratio of the composition contained is sually 0.001-50pts.wt., preferably 0.001- 10pts.wt. compound shown by the formula based on 1pt.wt. oxadiazon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is based on the general formula (■): [In the formula, ^ 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. ] pyrazolesulfonylurea derivative represented by and 3-(
2,4-dichloro-5-isopropoxyphenyl)-5
-t-butyl-1,3,4-oxadiazole-2(3
The present invention relates to a herbicide containing H)-one (hereinafter referred to as oxacyacin) 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 grass-like grass and perennial broad-leaved weeds, but also against perennial weeds, making it highly useful.

Oxacyacin, which has been known for a long time, is found in wild animals,
- Higher doses of compounds represented by formula (I) have been used against annual weeds and firefly, resulting 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)
We have completed the present invention by discovering that when the compound represented by the formula is blended with the conventionally used oxacyacin, the herbicidal effects of each compound 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 can completely control everything from wild weeds, 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 possible to reduce the amount of oxacyacin 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.

Compositions according to the present invention generally contain a compound having the general formula
0.001 to 50 parts by weight, preferably 0.001 to 50 parts by weight of the compound represented by
．． 001 to 10 parts by weight.

In many cases, the greatest advantage of the combined herbicides of the present invention is the formula (I
) is relatively lower than that of oxacyacin, for example, when the proportion of compounds of the general formula CI per part by weight of the other herbicide is
) is obtained when the amount of the compound represented by 0.001 to 0.1 part by weight 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 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), 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 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 rWeedJ vol. 15, pp. 20-22, 1
967) 00 α: Inhibition rate β when herbicide A is treated at an amount of aKg/haO: Inhibition rate E when herbicide B is treated at an amount of bKg/ha: Herbicide A is aKg/ha , herbicide B bKg/ha
If the expected inhibition rate when treated with the amount of O, 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, formulation amounts, array types, etc. in the present invention are not limited to the examples.

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

Name ■1 Granule Compound No. 6, -------0,2 parts Oxacyacin ---1,0 parts Hentonite ---
−−−−−−−−−50 parts talc −−1−−−・−・
------- 48, 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 7 granules.

[Planning plate l Granule compound tooth 8 ----------- 0.1 part Molinate ------0.7 parts Bentonite ------40 parts Talc ---, --59, 2 parts or more - After uniformly mixing and pulverizing 2 parts, adding a small amount of water, stirring and kneading, granulating with an extrusion type granulator, and drying to form granules.

Compound resistance Wettable powder Compound 4 -・-------------3 parts Oxacyacin ---50 parts Siegrite A --- -43 parts (kaolin clay:
Sieglite Industries ■Product name) Tsurupol 5039 --
-----・-, ---, 2 parts (mixture of nonionic surfactant and anionic surfactant: Toho Chemical ■ trade name) Carplex (anti-caking agent) --- 2 parts ( White carbon (Shionogi & Co., Ltd. trade name) is mixed and pulverized uniformly to make a wettable powder.

L gold side (wettable powder compound tooth 2 ----~----------0, 6 parts oxacyacin -1-----9, 0l?I
I Zeekrite A, -----=----86, 4 parts (kaolin clay; Zeekrite Kogyo A1 trade name) Tsurupol 5039 -------------- 2 parts ( Mixture of nonionic surfactant and anionic surfactant; Toho Chemical (trade name) Carplex (anti-caking agent) - 2 parts or more (white carbon: Shionogi & Co., Ltd. 01 brand name) are mixed and pulverized uniformly. and use it as a hydrating agent.

6 parts Flowable compound No., 3 ----------0, 3 parts oxacyacin - 8 parts Agridur S-7
10 ------- 10 parts (Nonionic surfactant: Kao Atlas ■Product name) Lunosox 1000 C-'------ 0, 5 parts (Anionic surfactant: Toho Chemical ■Product name) 1 % Rhodopol water -------------20 parts (thickener:
Lone Boulin product name) Water −−−1−−−−−−
−−−−−−−−−−−−−−−−−m−−・−−−−
61. Mix 2 or more parts uniformly to make a flowable agent:
Compounding compound Flowable compound N15 ----------0.6 parts Oxacyacin -8 parts Agelisil S'-710-
---10 parts (Nonionic surfactant: Kao Atlas brand name) Lunonox 1000 C---0, 5 parts (Anionic surfactant: Toho Chemical brand name) 1 % Rhodopol water --- 1--------20 parts (thickener: Lone-Boulin brand name) Water ---
-------------60.9 parts or more are uniformly mixed to form a flowable agent.

Narishun Co., Ltd. Herbicidal effect test under flooded conditions 1150
After putting alluvial soil in Wagner Bosoto of 00 ares,
Add water and mix to create freshwater conditions at a 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. 25 pots
Plants were grown in a greenhouse at ~30°C, and 10
At the 1.5-leaf stage of Japanese millet, a diluted drug solution 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% 〇 - Weed killing rate 5% or less (mostly not effective) However, the above The 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) Margin below Table 3 Test ■ (Synergistic effect test on millet Each prescribed drug was treated with flooded soil.The pots were placed in a greenhouse at 25 to 30°C for management and cultivation, and 30 minutes 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.

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% Table 4 Table 4 (continued) Table 5 Mixed herbicidal effect test (weed killing rate 1%) Table 5 (continued) In the table, the calculated values are the expected values calculated from the Co1by formula above. show.

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

Patent applicant: Nissan Chemical Industries, Ltd.

Claims (1)

[Claims] 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. ] pyrazolesulfonylurea derivative represented by and 3-(
2,4-dichloro-5-isopropoxyphenyl)-5
-t-butyl-1,3,4-oxadiazole-2(3
A herbicide characterized by containing H)-one as an active ingredient.