Weeding composition for paddy field
By combining sodium methyl iodosulfuron-methyl and clopyralid, the problem of resistance and poor control effect of existing herbicides has been solved, achieving efficient and safe weed control, suitable for rice, wheat and non-arable land.
Patent Information
- Application Number
- CN202511347117.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-19
- Publication Date
- 2025-12-16
AI Technical Summary
Existing herbicides are prone to developing resistance and have unstable efficacy when controlling Alternanthera philoxeroides. They are also ineffective against specific weeds. Existing compound formulations have defects and are difficult to effectively control stubborn broadleaf and sedge weeds in paddy fields.
By rationally combining sodium methyl iodosulfuron-methyl and clopyralid, which have different mechanisms of action, a synergistic effect is achieved, improving the herbicidal effect, broadening the spectrum of weed control, reducing the risk of resistance, and adding a safener to reduce phytotoxicity to gramineous crops.
It significantly improves the control effect on weeds such as alligator weed, reduces the regeneration rate, expands the application range, reduces the number of times farmers need to use pesticides, reduces the risk of resistance, ensures crop safety, and is environmentally friendly.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of pesticide compounding, in particular to a weeding composition for rice field. BACKGROUND
[0002] In agricultural production, the weeds in the fields of Gramineae crops such as rice, wheat and corn and non-cultivated land are seriously harmful, and among them, alligator weed has strong reproductive ability and developed root system, which poses a great threat to crop growth. Although the existing oral weeding agent can kill the aboveground stems and leaves of alligator weed, it is difficult to effectively kill the strong underground root system, resulting in easy regrowth of weeds and gradual expansion of the damage range.
[0003] At present, the commonly used weeding agents for preventing and controlling such weeds have many defects: Methyliodosulfuron-methyl-sodium, as a sulfonylurea herbicide, is prone to cause weed resistance when used for a long time, and has poor safety to some Gramineae crops, so a safety agent needs to be added during use; Fluroxypyr (isooctyl) belongs to a hormone herbicide, which is highly effective for broadleaf weeds but ineffective for Gramineae weeds, and is easily affected by water layer fluctuation when applied in rice fields, so the efficacy stability is poor, and long-term single use also easily causes weed resistance.
[0004] At the same time, the existing mainstream compounding schemes also have obvious defects: methyliodosulfuron-methyl-sodium and bifenox are compounded, but the effect of preventing and controlling some broadleaf weeds such as rain lily is insufficient; fluroxypyr (isooctyl) and cyhalofop-butyl are compounded, which not only has high cost, but also has poor effect of preventing and controlling sedge weeds. Therefore, it has become a problem to be solved in the current pesticide field to develop a weeding composition which is highly effective, safe, can effectively prevent and control stubborn broadleaf weeds and is suitable for various crop fields. SUMMARY
[0005] In view of the problems in the prior art such as single use of weeding agent causing resistance, unstable efficacy, poor effect of preventing and controlling specific weeds and defects of compounding scheme, the present application provides a weeding composition for rice field, which realizes synergistic effect, improves weeding effect, expands weed killing spectrum, reduces the risk of weed resistance, improves safety to crops and meets the demand of agricultural production for highly effective weeding agent by reasonably compounding two weeding agents with different action mechanisms.
[0006] To achieve the above purpose, the present application realizes the following technical scheme: a weeding composition for rice field, which comprises methyliodosulfuron-methyl-sodium and fluroxypyr as effective components, and the weight ratio of methyliodosulfuron-methyl-sodium to fluroxypyr is 0.05-5:1-80. The molecular formula of methyliodosulfuron-methyl-sodium is , and the relative mass is 529.24; the structural formula is as follows: ; The molecular formula of the chlorofenprop-methyl is The relative molecular mass is 255.03, and the structural formula is as follows: .
[0007] Optionally, the effective component weight ratio of the iodosulfuron-methyl-sodium and the chlorofenprop-methyl is 0.1-3:5-40.
[0008] Optionally, the effective component amount of the iodosulfuron-methyl-sodium in the use amount per hectare is 1.5 g-45 g.
[0009] Optionally, the effective component amount of the chlorofenprop-methyl in the use amount per hectare is 75 g-600 g.
[0010] Optionally, the safety agent is a conventional pesticide safety agent for reducing the phytotoxicity of the iodosulfuron-methyl-sodium to gramineae crops, and includes, but is not limited to, metrafenone and isoxadifen-ethyl.
[0011] Optionally, the dosage form of the herbicidal composition is emulsifiable concentrate, suspension concentrate, wettable powder or water dispersible granule, and includes one or more of conventional auxiliaries in a pesticide preparation, such as emulsifiers, dispersants, stabilizers and fillers.
[0012] The present application provides a herbicidal composition for a rice field, which has the following beneficial effects: The herbicidal composition for the rice field, the iodosulfuron-methyl-sodium as a sulfonylurea herbicide, the action mechanism is to hinder the biosynthesis of valine and leucine of weeds; the chlorofenprop-methyl (isooctyl) as a hormone herbicide, the action mechanism is to interfere with the endogenous hormone balance of weeds. The action mechanisms of the two herbicides are completely different, and after compounding, the weeds can be subjected to "double blow" from different metabolic pathways, the herbicidal efficiency is significantly improved, the death speed of weeds is accelerated, especially for the existing herbicide difficult to prevent and remove Alternanthera philoxeroides, the aboveground part and underground root system of the weeds can be effectively killed, and the weed regeneration rate is greatly reduced.
[0013] The composition not only has high efficiency on broadleaf weeds (such as Alternanthera philoxeroides and Monochoria vaginalis), but also can effectively prevent and remove sedge weeds (such as Isoetes sinensis and Commelina communis), and can be widely applied to rice fields, wheat fields, corn fields and uncultivated land, solves the problem of narrow herbicidal spectrum of single herbicide, and reduces the types and times of use of pesticides by farmers.
[0014] Due to the great difference in the action mechanisms of the two effective components, the weeds can be prevented from rapidly developing resistance to single action mechanism herbicide due to long-term contact, the field application period of the herbicidal composition is prolonged, and the difficulty of weed resistance management in agricultural production is reduced.
[0015] By optimizing the ratio of the two active ingredients and adding a safener as needed, the risk of phytotoxicity of the methyl iodine sulfonate sodium salt to gramineous crops is effectively reduced, ensuring the safe growth of crops; at the same time, reasonable dosage design reduces the residue of the pesticide in the environment, and the compatibility with the ecological environment is excellent, meeting the needs of green agricultural development.
[0016] Compared with the insufficient effect of "methyl iodine sulfonate sodium salt + bispyribac-sodium" on rain lilies, the high cost of "fluroxypyr (isooctyl) + cyhalofop-butyl" and the poor effect on sedge weeds, the composition of the present application has obvious advantages in prevention and control effect, applicable weed species and cost control, and is more practical. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described below in a clear and complete manner. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.
[0018] Example 1: A herbicidal composition for rice fields, comprising methyl iodine sulfonate sodium salt and fluroxypyr (isooctyl) as active ingredients, the effective ingredient dosage of methyl iodine sulfonate sodium salt and fluroxypyr (isooctyl) per mu is 0.1 g and 40 g respectively, i.e. the weight ratio is 0.1:40. The herbicidal composition also includes a safener, which is a conventional pesticide safener for reducing the phytotoxicity of methyl iodine sulfonate sodium salt to gramineous crops, including but not limited to pyrazoxyfen and bispyribac-sodium. The dosage form of the herbicidal composition is emulsifiable concentrate, suspension concentrate, wettable powder or water dispersible granule, and contains conventional adjuvants in pesticide formulations, including one or more of emulsifiers, dispersants, stabilizers and fillers.
[0019] Example 2: A herbicidal composition for rice fields, comprising methyl iodine sulfonate sodium salt and fluroxypyr (isooctyl) as active ingredients, the effective ingredient dosage of methyl iodine sulfonate sodium salt and fluroxypyr (isooctyl) per mu is 1 g and 20 g respectively, i.e. the weight ratio is 1:20. The herbicidal composition also includes a safener, which is a conventional pesticide safener for reducing the phytotoxicity of methyl iodine sulfonate sodium salt to gramineous crops, including but not limited to pyrazoxyfen and bispyribac-sodium. The dosage form of the herbicidal composition is emulsifiable concentrate, suspension concentrate, wettable powder or water dispersible granule, and contains conventional adjuvants in pesticide formulations, including one or more of emulsifiers, dispersants, stabilizers and fillers.
[0020] Embodiment three: a weeding composition for rice field, comprising methyl iodide sulfone sodium salt and fluroxypyr (isooctyl) as effective components, the effective component of methyl iodide sulfone sodium salt and fluroxypyr (isooctyl) is 3g and 5g per mu respectively, i.e. the weight ratio is 3:5.
[0021] The weeding composition further comprises a safener, which is a conventional pesticide safener for reducing the phytotoxicity of methyl iodide sulfone sodium salt to gramineous crops, including but not limited to pyrazoxyfen and topramezone. The weeding composition is in the form of emulsifiable concentrate, suspension concentrate, wettable powder or water dispersible granule, and comprises one or more of conventional adjuvants in pesticide formulations, including emulsifiers, dispersants, stabilizers and fillers.
[0022] Three embodiments are made, and a comparative composition is selected, and the test results are as follows:
[0023] In the table, methyl iodide represents methyl iodide sulfone sodium salt, and chloro represents fluroxypyr (isooctyl), the control effect is calculated according to the fresh weight of surviving weeds, which is called fresh weight control effect (%), and the amount of pesticide used per mu represents the weight (g) of the effective component of each herbicide component.
[0024] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.
Claims
1. A weed control composition for paddy fields, characterized in that, The active ingredients are sodium iodosulfuron-methyl and clopyralid, wherein the weight ratio of sodium iodosulfuron-methyl to clopyralid is 0.05–5:1–80. The molecular formula of sodium mesosulfuron-methyl is: Its relative mass is 529.24; its structural formula is as follows: ； The molecular formula of chloropyroxyacetic acid is Its relative molecular mass is 255.03, and its structural formula is as follows: 。 2. The paddy field weed control composition according to claim 1, characterized in that, The weight ratio of the active ingredients of sodium methyl iodosulfuron salt to clopyralid is 0.1–3:5–40.
3. The paddy field weed control composition according to claim 1, characterized in that, The effective ingredient content of the sodium methyl iodosulfuron salt per hectare is 1.5g to 45g.
4. The paddy field weed control composition according to claim 1, characterized in that, The effective ingredient of clopyralid per hectare is 75g to 600g.
5. The paddy field weed control composition according to any one of claims 1-4, characterized in that, It also includes safeners, which are conventional pesticide safeners that reduce the phytotoxicity of sodium methyl iodide to gramineous crops, including but not limited to pyrazosulfuron-methyl and bis(oxazolyl) acid.
6. The paddy field weed control composition according to any one of claims 1-4, characterized in that, The herbicidal composition is in the form of emulsifiable concentrate, suspension concentrate, wettable powder or water-dispersible granule, and contains adjuvants commonly used in pesticide formulations, including one or more of emulsifiers, dispersants, stabilizers and fillers.