Weeding composition containing oxadiazon and application of weeding composition

Abstract

The invention provides a weeding composition containing benzene oxadiazon, the active ingredients of the weeding composition comprise the benzene oxadiazon and Epyrifenacil, and the mass ratio of the benzene oxadiazon to the Epyrifenacil is (1: 20)-(20: 1). The weeding composition disclosed by the invention has a remarkable synergistic effect, can be used for remarkably improving the weeding effect of a medicament, reducing the dosage of the medicament, slowing down the generation of pesticide resistance and relieving environmental pollution, can be used for preventing and removing annual weeds in a corn field, and has an excellent weeding effect.

Description

Technical Field

[0001] The invention belongs to the field of herbicides, and particularly relates to a herbicidal composition comprising pyraclostrobin and an application thereof. Background Art

[0002] Benzopyrazone is a derivative of benzathine. Its control effect on broad-leaved weeds such as quinoa, Amaranthus chinensis, field bindweed, Amaranthus retroflexus, Commelina, Thistle, and Channa striata is significantly better than benzathine, and its efficacy is about 2 times that of benzathine. Its control effect on broad-leaved weeds such as Purslane is significantly better than benzathine, and its efficacy is about 3.8 times that of benzathine. Its control effect on broad-leaved weeds such as Abutilon is equivalent to that of benzathine. The development of benzathine solves the current problems of benzathine's poor effect on sedge weeds, poor sustained control ability on broad-leaved weeds, and poor scouring resistance. The chemical structure of benzathine is: CN202311455118.9 has been disclosed in the patent document.

[0003] Epyrifenacil is a uracil herbicide developed by Sumitomo Chemical Co., Ltd. of Japan. Its IUPAC name is ethyl [(3-{2-chloro-4-fluoro-5-[3-methyl-2,6-dioxo-4-(trifluoromethyl)-3,6-dihydropyrimidin-1(2H)-yl]phenoxy}-2-pyridyl)oxy]acetate; molecular formula C21H16ClF4N3O6; Epyrifenacil obtained the ISO common name in March 2020. The International Herbicide Resistance Action Committee (HRAC) classifies it as Group 14, which can be used to control broadleaf weeds and grass weeds, and has low toxicity to mammals. The chemical structure of Epyrifenacil is:

[0004] Long-term use of a single agent can easily lead to the development of weed resistance and environmental pollution. Finding a synergistic combination that can improve the weed control effect and reduce the dosage of active ingredients is the research and development focus of many domestic pesticide companies. There is no related report on the combined use of fenpyraclostrobin and Epyrifenacil in the prior art. Summary of the invention

[0005] The present invention provides a herbicidal composition comprising pyrifos and epyrifenacil and its application, and the herbicidal composition of the present invention has a significant synergistic effect. The specific technical scheme is as follows:

[0006] A herbicidal composition containing fenoxamethoxazole, wherein the active ingredients include fenoxamethoxazole and Epyrifenacil, and the mass ratio of fenoxamethoxazole to Epyrifenacil is 1:20-20:1. The preferred mass ratio of fenoxamethoxazole to Epyrifenacil is 1:16-1:1. The preferred mass ratio of fenoxamethoxazole to Epyrifenacil is 1:10-1:1.

[0007] The total mass percentage of active ingredients in the herbicidal composition of the present invention is 1-80%, preferably 5-75%, and preferably 5-60%.

[0008] The herbicidal composition of the present invention is mixed with pesticide adjuvants to prepare any preparation suitable for use in agriculture. Preferably, the preparation is a suspension concentrate, a dispersible oil suspension concentrate, a suspoemulsion, a water dispersible granule, or a wettable powder.

[0009] The herbicidal composition of the present invention is used for controlling weeds in corn fields. Preferably, the weeds are annual grass, broadleaf and sedge weeds. Preferably, the weeds are crabgrass, barnyard grass, goosegrass, quinoa, Polygonum, Amaranthus retroflexus, Purslane and the like.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The herbicidal composition of the present invention has a significant synergistic effect, can significantly improve the herbicidal effect of the agent, reduce the dosage of the agent, slow down the generation of pesticide resistance, and reduce environmental pollution. The herbicidal combination of the present invention can be used for the prevention and control of annual weeds in corn fields and has an excellent herbicidal effect. DETAILED DESCRIPTION

[0012] The present invention can be better understood according to the following examples. However, it is easy for those skilled in the art to understand that the contents described in the examples are only used to illustrate the present invention, and should not and will not limit the present invention described in detail in the claims.

[0013] Example 1: Indoor bioassay of the herbicidal combination of fenpyraclostrobin and Epyrifenacil against grass weeds

[0014] Test weeds: Echinochloa crusgalli, mature seeds were collected from the field and cultured and preserved in the laboratory.

[0015] Test drugs: Benzopyrazone, Epyrifenacil.

[0016] Test method: Greenhouse potting method was adopted. The test soil was special test soil collected from the untreated plot. Put the special test soil into the flowerpot; place the flowerpot in a basin filled with water, and use the bottom infiltration irrigation method to keep the soil moist. Sow a certain amount of barnyard grass seeds in the flowerpot, and cover with 0.5cm of soil after sowing. The seedlings were determined during the 2-leaf period, and 20 barnyard grasses with the same growth potential were retained in each pot, and they were treated when they grew to the 3-4 leaf stage. Use a potter spray device to spray the stems and leaves, and repeat 4 times for each treatment. After treatment, place it in the greenhouse for normal management, observe the growth of barnyard grass regularly, weigh the fresh weight of the aboveground part of barnyard grass after 14 days, and calculate the fresh weight inhibition rate.

[0017] The Gowing method was used to evaluate the combined effect of the herbicidal combination. The measured fresh weight inhibition rate after compounding was represented by E.

[0018] When E–E0>10%, it is a synergistic effect, E–E0<–10% is an antagonistic effect, and E–E0 between –10% and 10% is an additive effect.

[0019] Result analysis: When the mass ratio of oxazolidinone to Epyrifenacil in the herbicidal composition of oxazolidinone and Epyrifenacil is 2-8:0.5-2, it shows a significant synergistic effect on barnyardgrass. When the herbicidal composition is a synergistic composition, it can significantly improve the herbicidal effect of the agent, reduce the dosage of the agent, slow down the development of pesticide resistance, and reduce environmental pollution.

[0020] Table 1 Indoor bioassay of the herbicidal combination of pyrifos and Epyrifenacil against barnyardgrass

[0021]

[0022]

[0023] Example 2: Indoor bioassay of the herbicidal combination of fenpyraclostrobin and Epyrifenacil against broadleaf weeds

[0024] Test weeds: Purslane, mature seeds were collected from the field and cultured and preserved in the laboratory.

[0025] Test drugs: Benzopyrazone, Epyrifenacil.

[0026] Test method: Greenhouse potting method was adopted. The test soil was special test soil collected from the untreated plot. Put the special test soil into the flowerpot; place the flowerpot in a basin filled with water, and use the bottom infiltration irrigation method to keep the soil moist. Sow a certain amount of purslane seeds in the flowerpot, and cover with 0.5cm of soil after sowing. Keep 20 purslane with the same growth potential in each pot, and wait until they grow to the 4-leaf stage for treatment. Use a potter spray device to spray the stems and leaves, and repeat 4 times for each treatment. After treatment, place it in the greenhouse for normal management, observe the growth of purslane regularly, weigh the fresh weight of the above-ground part of purslane after 14 days, and calculate the fresh weight inhibition rate.

[0027] The Gowing method was used to evaluate the combined effect of the herbicidal combination. The measured fresh weight inhibition rate after compounding was represented by E.

[0028] When E–E0>10%, it is a synergistic effect, E–E0<–10% is an antagonistic effect, and E–E0 between –10% and 10% is an additive effect.

[0029] Result analysis: When the mass ratio of oxazolidinone to Epyrifenacil in the herbicidal composition of oxazolidinone and Epyrifenacil is 2-8:0.5-2, it shows a significant synergistic effect on the broad-leaved weed Portulaca oleracea. When the herbicidal composition is a synergistic composition, it can significantly improve the herbicidal effect of the agent, reduce the dosage of the agent, slow down the development of pesticide resistance, and reduce environmental pollution.

[0030] Table 2 Indoor bioassay of the herbicidal combination of pyrifos and Epyrifenacil on Portulaca oleracea

[0031]

[0032] Example 3 Field control effect of the herbicidal combination of pyraclostrobin and Epyrifenacil on weeds in corn fields.

[0033] Test crops: corn field

[0034] Field weeds: crabgrass, barnyard grass, goosegrass, quinoa, polygonum, Amaranthus retroflexus, and purslane.

[0035] Test drug:

[0036] 20% benzopyrazone and Epyrifenacil suspension (the mass ratio of benzopyrazone and Epyrifenacil is 1:1); 25% benzopyrazone and Epyrifenacil suspension (the mass ratio of benzopyrazone and Epyrifenacil is 4:1); the auxiliary materials of the suspension are all conventional auxiliary agents.

[0037] Application method: Set up pesticide treatment and blank control, repeat 4 times; each plot area is 50m2, randomly arranged. Use sprayer to spray stems and leaves. 21 days after application, investigate the weed control effect of fresh weight.

[0038] Result analysis: The herbicide combination of pyrifos and epyrifenacil has a good control effect on weeds in corn fields. The dosage of active ingredient is 6-10 grams of active ingredient / hectare, which can effectively control weeds in the field.

[0039] Table 3 Effect of compound preparations on weed control in corn fields

[0040]

[0041] The above is only a preferred embodiment of the present invention. For those skilled in the art, appropriate improvements can be made without departing from the raw materials of the present invention, and these improvements are also within the scope of protection of the present invention.

Claims

1. A herbicidal composition comprising fenpyraclostrobin, characterized in that: The active ingredients include benzopyrazone and Epyrifenacil, and the mass ratio of benzopyrazone to Epyrifenacil is 1:20-20:

1.

2. The herbicidal composition according to claim 1, characterized in that The mass ratio of benzopyrazone and Epyrifenacil is 1:16-1:

1.

3. The herbicidal composition according to claim 2, characterized in that The mass ratio of benzopyrazone and Epyrifenacil is 1:10-1:

1.

4. The herbicidal composition according to claim 3, characterized in that The total mass percentage of active ingredients is 1-80%.

5. The herbicidal composition according to claim 1, characterized in that The herbicidal composition is mixed with pesticide adjuvants to prepare any preparation suitable for use in agriculture.

6. The herbicidal composition according to claim 5, characterized in that The preparation is a suspension, a dispersible oil suspension, a suspoemulsion, a water-dispersible granule, or a wettable powder.

7. Use of the herbicidal composition according to any one of claims 1 to 6 for controlling weeds in corn fields.

8. The use of the herbicidal composition according to claim 7, characterized in that: The weeds are annual grass, broadleaf and sedge weeds.

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