Weeding composition and herbicide for preventing and removing field weeds

Abstract

The invention belongs to the technical field of herbicides, and particularly relates to a weeding composition for preventing and removing field weeds and a herbicide. The invention relates to a weeding composition, which is used for preventing and removing field weeds, and is prepared by compounding a first active component and a second active component according to a mass ratio of (1-100): (100-1), the first active ingredient is the cyclopyridazinate, and the second active ingredient is the chlorantraniliprole or the triafamone. According to the weeding composition disclosed by the invention, when the cyclopyridazinate is compounded with the chlorantraniliprole or the triafamone, the weeding composition shows a synergistic effect on prevention and removal of weeds in crop fields, and especially when the mass ratio of the cyclopyridazinate to the chlorantraniliprole is 1: 8 and the mass ratio of the cyclopyridazinate to the triafamone is 15: 1, the synergistic effect is most remarkable. It is shown that the control effect on the field weeds can be improved by compounding the cyclopyridazinate and the chlorantraniliprole or the triafamone.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides, and particularly relates to a herbicide composition and a herbicide for preventing and killing weeds in the field. Background Art

[0002] Cyclopyrimorate (CAS: 499231-24-2) is a phenoxypyridazine herbicide discovered and developed by Mitsui Chemicals AGRO Co., Ltd. of Japan. It is a homogentisatesolanesyltransferase (HST) inhibitor. The International Herbicide Resistance Action Committee (HRAC) classifies it as Group 33, a phenoxypyridazine structure type. Cyclopyrimorate is a model of albino herbicides. It is highly effective in controlling broadleaf weeds in rice fields and can effectively control weeds resistant to ALS inhibitor herbicides. It can be used in a variety of rice fields, such as direct-seeded rice and transplanted rice. It is highly safe for rice and has a long lasting effect.

[0003] Clacyfos (CAS: 215655-76-8) is a substituted phenoxyacetyl hydroxyphosphate herbicide developed by Central China Normal University with independent intellectual property rights. It is a pyruvate dehydrogenase inhibitor. Clacyfos can be absorbed through buds, roots, stems, and leaves. It is safe for gramineous crops and has excellent control effects on broadleaf weeds. It can also control sedges.

[0004] Triafamone (CAS: 874195-61-6) is a pre-emergence and post-emergence herbicide discovered and developed by Bayer. It is an acetolactate synthase inhibitor that inhibits the biosynthesis of branched-chain amino acids valine, leucine and isoleucine, destroys protein synthesis, and thus interferes with DNA synthesis and cell division and growth, ultimately leading to plant death. Its main target weeds are grass weeds, broadleaf weeds and sedges.

[0005] At present, spraying herbicides is still the main means of controlling various weeds in the field. However, due to the continuous and unscientific abuse of herbicides, various weeds in the field have developed different degrees of resistance to them, resulting in a gradual decrease in the control effect of herbicides. In production, although increasing the dosage of herbicides can improve the control effect to a certain extent, this will aggravate the accumulation of resistance and also lead to problems of pesticide residues and pesticide damage.

[0006] So far, there are no reports on the combination of cypermethrin with chlorpyrifos or fluazifop-butyl. Summary of the invention

[0007] The object of the present invention is to provide a herbicide composition and a herbicide for controlling field weeds, which can reduce the risk of drug resistance, improve the weed control effect, and reduce the amount of herbicide used compared with single-component herbicides.

[0008] The present invention provides the following technical solutions:

[0009] A herbicidal composition is used for preventing and controlling weeds in the field. The herbicidal composition is compounded with a first active ingredient and a second active ingredient in a mass ratio of 1-100:100-1; the first active ingredient is cypermethrin, and the second active ingredient is chlorpyrifos or fluazifop-butyl.

[0010] Furthermore, the mass ratio of cypermethrin to chlorpyrifos is 1-16:20-1 or 1:8.

[0011] Furthermore, the mass ratio of cypermethrin to fluazifop-butyl is 1-30:4-1 or 15:1.

[0012] A herbicide comprises an active ingredient, an auxiliary ingredient and a safener, wherein the active ingredient is the herbicide composition.

[0013] Furthermore, the mass of the active ingredient accounts for 0.1-80% of the total mass of the herbicide.

[0014] Furthermore, the mass of the active ingredient accounts for 15-55% of the total mass of the herbicide.

[0015] Furthermore, the auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, solvents, cosolvents, disintegrants, fillers, defoamers, thickeners, binders, colorants, synergists and preservatives.

[0016] Furthermore, the safener is selected from mefenpyr-butyl.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) When the present invention combines cypermethrin with phosphinothricin or fluazifop-butyl, a synergistic effect is shown on the weed control of crop fields, especially when the mass ratio of cypermethrin to phosphinothricin is 1:8 and the mass ratio of cypermethrin to fluazifop-butyl is 15:1, the synergistic effect is most significant. This indicates that the present invention combines cypermethrin with phosphinothricin or fluazifop-butyl to improve the control effect of field weeds.

[0019] (2) The herbicidal composition of the present invention can improve the weed control effect in the field and delay the generation and development of weed resistance. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solution of the patent of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example :Indoor biological activity test of cypermethrin compound

[0022] 1. Test Weeds

[0023] Eclipta prostrata

[0024] 2. Test reagents

[0025] 98% cypermethrin (Shanghai Yuanxi Biotechnology Co., Ltd.), 95% chlorpyrifos (Shenzhen Aituo Chemical Co., Ltd.), 95% fluazifop-butyl (Shenzhen Aituo Chemical Co., Ltd.)

[0026] 3. Test method: (Refer to "NY / T 1155.4-2006 Pesticide Indoor Bioassay Test Guidelines Herbicides Part 4: Activity Determination Test Stem and Leaf Spray Method")

[0027] The test agent was dissolved in dimethyl sulfoxide and then diluted with 0.05% Tween-80 aqueous solution to form a single mother solution. Multiple groups of ratios were set, and each single mother solution and each group of mixed agents were diluted with 0.05% Tween-80 aqueous solution to form 5 mass concentration gradients. The seeds of Channa intestine collected from the field were evenly sown in plastic pots, 30 seeds / pot, and routinely cultured in the greenhouse and kept the soil moist. When the weed seedlings grew to the 3-leaf stage, thinning was carried out, and 10 seedlings with consistent growth were left in each pot. Then the stems and leaves of the weed seedlings were sprayed with the liquid medicine using a walking spray tower. Each treatment was repeated 5 times, and the treatment of spraying 0.05% Tween-80 aqueous solution on the stems and leaves was set as a blank control. After treatment, it was transferred to the greenhouse for routine culture. 14 days after the application of the medicine, the fresh weight of the aboveground part of the weeds was weighed, and the fresh weight control effect was calculated. The DPS software was used to calculate the logarithmic value of the concentration of the pesticide and the probability value of the fresh weight control effect, and the ED of each single agent and different ratios of the mixture on the test weeds was obtained. 50 , and the co-toxicity coefficient (CTC value) of the mixture was calculated according to Sun Yunpei's method.

[0028] 4. Calculation method

[0029]

[0030] In the above formula: E--fresh weight control effect (%); C--fresh weight of the aboveground part of the control weeds (g); T--fresh weight of the aboveground part of the treated weeds (g).

[0031] 5. Pharmaceutical evaluation

[0032] The synergistic effect of mixed drugs was evaluated based on the co-toxicity coefficient (CTC), that is, CTC≤80 was antagonistic, 80<CTC<120 was additive, and CTC≥120 was synergistic. The experimental results are shown in Table 1-2.

[0033] Table 1 Results of indoor bioactivity test of cypermethrin and chlorpyrifos combined on the intestines of snakehead

[0034] Drug name and ratio <![CDATA[ED 50 (ga.i. / hm 2 )]]> ATI TTI CTC Cyclopyridazine 8.4711 100.0000 -- -- Phosphate chloramphenicol 21.5237 39.3571 -- -- Cyclopyridazine 1: Chlorpyrifos 20 11.3502 74.6339 42.2448 176.6699 Cyclopyridazine 1: Chlorpyrifos 16 8.5962 98.5447 42.9243 229.5778 Cyclopyridazine 1: Chlorpyrifos 8 6.3976 132.4106 46.0952 287.2547 Cyclopyridazine 1: Chlorpyrifos 4 10.7217 79.0089 51.4857 153.4581 Cyclopyridazine 1: Chlorpyrifos 1 9.7265 87.0930 69.6785 124.9926 Cyclopyridazine 4: Chlorpyrifos 1 7.8378 108.0801 87.8714 122.9980 Cyclopyridazine 8: Chlorpyrifos 1 5.7652 146.9351 93.2619 157.5510 Cyclopyridazine 16: Chlorpyrifos 1 6.0428 140.1850 96.4328 145.3707

[0035] It can be seen from the test results in Table 1 that the co-toxicity coefficient of cypermethrin and chlorpyrifos for controlling snakehead intestine is greater than 120 in the mass ratio range of 1-16:20-1, showing a synergistic effect. When the mass ratio is 1:8, the synergistic effect is most significant. This shows that the compounding of cypermethrin and chlorpyrifos in the present invention can improve the control effect of field weeds.

[0036] Table 2 Results of indoor bioactivity test of cypermethrin and fluazifop-butyl on the intestine of snakehead

[0037] Drug name and ratio <![CDATA[ED 50 (ga.i. / hm 2 )]]> ATI TTI CTC Cyclopyridazine 8.4711 100.0000 -- -- fluazifop 13.9762 60.6109 -- -- Cyclopyridazine 1: Fluoxetine 4 8.0593 105.1096 68.4887 153.4700 Cyclopyridazine 1: Fluoxetine 1 7.3794 114.7939 80.3054 142.9466 Cyclopyridazine 4: Fluoxetine 1 7.4611 113.5369 92.1222 123.2460 Cyclopyridazine 8: Flucarbamide 1 6.5551 129.2291 95.6234 135.1438 Cyclopyridazine 10: Fluoxetine 1 5.1065 165.8886 96.4192 172.0494 Cyclopyridazine 15: Fluoxetine 1 2.6113 324.4016 97.5382 332.5894 Cyclopyridazine 20: Fluoxetine 1 4.3061 196.7233 98.1243 200.4837 Cyclopyridazine 30: Fluoxetine 1 6.9718 121.5052 98.7294 123.0689

[0038] It can be seen from the test result table 2 that the co-toxicity coefficient of cypermethrin and fluazifop-butyl in the mass ratio range of 1-30:4-1 for controlling snakehead intestine is greater than 120, showing a synergistic effect. When the mass ratio is 15:1, the synergistic effect is most significant. This shows that the compounding of cypermethrin and fluazifop-butyl in the present invention can improve the control effect of field weeds.

[0039] In summary, when the present invention combines cypermethrin with phosphinothricin or fluazifop-butyl, a synergistic effect is shown on the control of weeds in crop fields, especially when the mass ratio of cypermethrin to phosphinothricin is 1:8 and the mass ratio of cypermethrin to fluazifop-butyl is 15:1, the synergistic effect is most significant. This indicates that the present invention combines cypermethrin with phosphinothricin or fluazifop-butyl to improve the control effect of field weeds.

Claims

1. A herbicidal composition for controlling weeds in a field, characterized in that: The herbicidal composition is prepared by compounding a first active ingredient and a second active ingredient in a mass ratio of 1-100:100-1; the first active ingredient is cypermethrin, and the second active ingredient is chlorpyrifos or fluazifop-butyl.

2. The herbicidal composition according to claim 1, characterized in that The mass ratio of the cyclamate-butyl to chlorpyrifos is 1-16:20-1 or 1:

8.

3. The herbicidal composition according to claim 1, characterized in that The mass ratio of cypermethrin to fluazifop-butyl is 1-30:4-1 or 15:

1.

4. A herbicide comprising an active ingredient, an auxiliary ingredient and a safener, characterized in that: The active ingredient is the herbicidal composition according to claim 1.

5. The herbicide according to claim 4, characterized in that The mass of the active ingredient accounts for 0.1-80% of the total mass of the herbicide.

6. The herbicide according to claim 4, characterized in that The mass of the active ingredient accounts for 15-55% of the total mass of the herbicide.

7. The herbicide according to claim 4, characterized in that The auxiliary ingredients are selected from one or more of wetting agents, dispersants, emulsifiers, solvents, cosolvents, disintegrants, fillers, defoamers, thickeners, binders, colorants, synergists and preservatives.

8. The herbicide according to claim 4, characterized in that The safener is selected from mefenpyr-butyl.

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