CN-121970749-A - Weeding method and herbicide for reducing phytotoxicity of sethoxydim to gramineous crops

Abstract

The invention relates to the technical field of pesticides, in particular to a weeding method and herbicide for reducing phytotoxicity of sethoxydim to gramineous crops. According to the invention, the sethoxydim and imazethapyr are compounded in a weight ratio of 1:0.10-3.00, so that the herbicide injury of sethoxydim to gramineous crops can be obviously reduced, and the sethoxydim has a synergistic effect on weeds. The sethoxydim and imazethapyr are compounded in the proportion, so that the sethoxydim and imazethapyr can be used as a special ideal herbicide for the field between gramineous crops and broadleaf crops, the problem that the field between gramineous crops and broadleaf crops is difficult to effectively control gramineous weeds, the safety of the gramineous crops is ensured, and the application range of the sethoxydim is enlarged.

Inventors

• YUAN LIBING
• GENG YALING
• DONG XU
• WANG LINGHUI

Assignees

• 河北省农林科学院植物保护研究所

Dates

Publication Date

20260505

Application Date

20251229

Claims (10)

1. 1. A weeding method for reducing phytotoxicity of sethoxydim to gramineous crops is characterized in that sethoxydim and imazethapyr are compounded for use, and the weight ratio of sethoxydim to imazethapyr is 1:0.10-3.00.
2. 2. The weeding method according to claim 1, wherein the weight ratio of sethoxydim to imazethapyr is 1:0.13-1.00.
3. 3. The weeding method according to claim 1, wherein the gramineous crop comprises one or more of corn, rice, wheat, millet, and sorghum.
4. 4. The weeding method according to claim 1, wherein the combination of sethoxydim and imazethapyr is used for field weeding in intercropping gramineous crops and broadleaf crops.
5. 5. The weeding method according to claim 4, wherein the broadleaf crop comprises any one or more of soybean, peanut, cotton, potato, and canola.
6. 6. The weeding method according to claim 1, wherein the weeding target comprises grassy weeds, preferably crabgrass and green bristlegrass.
7. 7. The weeding method according to any one of claims 1-6, wherein the composition contains 50-300g/hm 2 of the total effective components of sethoxydim and imazethapyr.
8. 8. The herbicide is characterized by comprising sethoxydim and imazethapyr, wherein the weight ratio of the sethoxydim to the imazethapyr is 1:0.10-3.00.
9. 9. Herbicide according to claim 8, characterized in that the sethoxydim and imazethapyr represent 1% to 90%, preferably 5% to 60% of the total weight of the herbicide.
10. 10. The herbicide according to claim 8, wherein the herbicide is in a dosage form selected from any one of emulsifiable concentrates, microemulsions, water dispersible granules, suspoemulsions, aqueous emulsions, oil suspensions, wettable powders, soluble powders, dry suspensions, aqueous solutions, oils and microencapsulated suspensions.

Description

Weeding method and herbicide for reducing phytotoxicity of sethoxydim to gramineous crops Technical Field The invention relates to the technical field of pesticides, in particular to a weeding method and herbicide for reducing phytotoxicity of sethoxydim to gramineous crops. Background Composite planting is being developed greatly in China, and includes composite planting of gramineous crops and broadleaf crops. Soybeans and corn are commonly used as herbicides for two different crop types. The herbicide for preventing and controlling gramineous weeds in the soybean fields often causes serious phytotoxicity to corns, and meanwhile, the herbicide commonly used in the corn fields also often causes serious phytotoxicity to soybeans, so that the weed prevention and control become difficult problems in the composite planting and popularization process, and the development of the herbicide with higher safety and better effect on the gramineous crops and broadleaf crops is needed. The popularization of the transgenic herbicide-resistant variety and the new variety provides an effective way for solving the problems of drug resistance and the like caused by single use of the target herbicide for a long time, and the conventional herbicide needs to be used alternately with the conventional herbicide to better exert the advantages of the transgenic variety, so that the development of the conventional herbicide with higher safety on both the gramineous crop and the broadleaf crop still has important significance. 2- [1- (Ethoxyimino) butyl ] -5- [2- (ethylthio) propyl ] -3-hydroxycyclohex-2-enone, the generic name "napping" is a selective post-emergence herbicide with high activity against almost all grassy weeds, such as barnyard grass, wild oat, green bristlegrass, alopecuroide, crabgrass, goosebeery, etc., but not against broadleaf weeds and safe. Therefore, the sethoxydim is specially used for preventing and removing gramineae weeds in broadleaf crop fields, is safe for broadleaf crops, but is easy to generate phytotoxicity when being applied to the gramineae crops, thereby limiting the application of the sethoxydim in compound planting. Disclosure of Invention Therefore, the invention aims to provide a weeding method capable of remarkably reducing the phytotoxicity of the sethoxydim to gramineous crops, and solves the problem that the field between gramineous crops and broadleaf crops is difficult to effectively control gramineous weeds and simultaneously ensures the safety of the gramineous crops. The invention also aims to provide a special herbicide for a field between gramineous crops and broadleaf crops, which has obviously lighter phytotoxicity to the gramineous crops than the single use of the sethoxydim and has good weeding effect. In order to achieve the above object, the present invention provides the following technical solutions. The invention provides a weeding method for reducing phytotoxicity of sethoxydim to gramineous crops, which is characterized in that sethoxydim and imazethapyr are used in a compounding way, and the weight ratio of sethoxydim to imazethapyr is 1:0.10-3.00. Compared with the single use of the sethoxydim, the invention discovers that the mixed use of the sethoxydim and the imazethapyr in the range can obviously improve the plant height and fresh weight of gramineous crops, thereby obviously reducing the phytotoxicity of the sethoxydim to the gramineous crops. As a preferred embodiment, the weight ratio of the sethoxydim to the imazethapyr is 1:0.13-1.00, more preferably 1:0.15-0.50. As one embodiment, the gramineous crop of the present invention includes any one or more of corn, rice, wheat, millet and sorghum. As a preferred embodiment, the combination of the sethoxydim and the imazethapyr is used for field weeding of intercropping of gramineous crops and broadleaf crops. The sethoxydim is safe to broadleaf crops, and after being compounded with imazethapyr, the sethoxydim can obviously lighten the phytotoxicity of the sethoxydim to gramineous crops, thereby being safely used for weed control in fields between gramineous crops and broadleaf crops. As an embodiment, the broad leaf crops of the present invention include any one or more of soybean, peanut, cotton, potato and rape, but are not limited to the technical solution of the present invention. The gramineous crops and the broad-leaf crops can be subjected to any one or more compound intercropping under the practicable condition, such as corn and soybean intercropping fields, wheat and peanut intercropping fields, rice and potato intercropping fields, millet and rape intercropping fields and the like. Compared with single dose use of the sethoxydim, the invention combines the sethoxydim and the imazethapyr to be used in intercropping fields of gramineous crops and broadleaf crops, is safe to the crops and has good weeding effect. The weeding method can prevent and treat all kinds of weeds with a prevention and treatment spe