A herbicidal composition containing fenoxaprop-p-ethyl, propanil and isoxaben and its use

Abstract

The application belongs to the field of agriculture and particularly relates to a herbicidal composition containing fenoxaprop-P-ethyl, propanil and isoxaben and application thereof; the mass ratio of fenoxaprop-P-ethyl, propanil and isoxaben in the herbicidal composition is 0.5-3:35-45:2-8. The herbicidal composition has a significant synergistic effect, can effectively reduce the use dosage of active ingredients, slow down the generation of drug resistance, and the prepared preparation has excellent control effect on weeds in rice fields.

Description

Technical Field

[0001] This invention belongs to the field of agriculture, specifically relating to a herbicidal composition containing quizalofop-p-ethyl, propargite and isoxaflutole and its application. Background Technology

[0002] Quizalofop-P-ethyl is a selective, systemic post-emergence herbicide. Its active ingredient is absorbed by the stems and leaves and translocated to the growing point, damaging the growing point and meristem of weeds. 5-7 days after application, the heart leaves of weeds lose their green color, the leaves turn purple, and they gradually wither and die. It can be used to control annual grass weeds in the field. Barnyardgrass is a highly selective contact herbicide. In rice, it is hydrolyzed by arylcarboxamide enzymes and detoxified by 3,4-dichloroaniline and propionic acid. Barnyardgrass lacks this detoxification mechanism; its cell membrane is damaged first, leading to water metabolism disorder and rapid dehydration and death. Two-leaf stage barnyardgrass is most sensitive. Barnyardgrass decomposes and becomes ineffective upon contact with soil and is only suitable as a foliar herbicide. Isoxaflutole is a selective pre-emergence herbicide. It is absorbed through the roots and young shoots, translocated upwards, and diffuses through the xylem to the leaves, inhibiting the synthesis of chlorophyll and carotene in sensitive weeds. It is effective in controlling annual weeds. It is selective for soybeans, and after being absorbed by crops, the active ingredients are transformed into non-toxic degradation products through special metabolic processes.

[0003] CN103891737A discloses a suspension emulsion containing isoxaflutole and propargite, characterized in that it is made from the following raw materials in weight fractions: 1-40% isoxaflutole technical grade, 1-40% propargite technical grade, 5-20% surfactant, 0-10% functional adjuvant, 10-80% solvent, and the remainder being water. CN116439248A discloses a herbicidal composition containing propargite and quizalofop-p-ethyl, characterized in that it contains active ingredients in the following mass ratio: the mass ratio of propargite to quizalofop-p-ethyl is 45:1-1:10; the herbicidal composition has a significant synergistic effect, can effectively reduce the dosage of active ingredients, slow down the development of herbicide resistance in weeds, and reduce environmental pollution. CN103960253A discloses a rice paddy herbicide composition containing propargite and isoxaflutole, using propargite and isoxaflutole as base raw materials. The composition is characterized by the addition of at least one of acetochlor, pretilachlor, or butachlor, and at least one of 2,4-D butyl ester, 2,4-D isooctyl ester, or 2,4-methyl tetrachloride, to the base raw materials, in combination with adjuvants or fillers. The weight percentage of each raw material is: propargite 5-35%, isoxaflutole 2-20%, at least one of acetochlor, pretilachlor, or butachlor 5-35%, at least one of 2,4-D butyl ester, 2,4-D isooctyl ester, or 2,4-methyl tetrachloride 0.5-10%, with the remainder being adjuvants or fillers.

[0004] No reports have been found of any combination of quizalofop-p-ethyl, propargite, and isoxaflutole in the existing technology. Summary of the Invention

[0005] The inventors discovered through experiments that the ternary composition consisting of quizalofop-p-ethyl, propargite, and isoxaflutole has a synergistic effect, and based on this, the present invention was completed.

[0006] The specific technical solution is as follows: A herbicidal composition containing quizalofop-P-ethyl, propargite, and isoxaflutole, wherein the mass ratio of quizalofop-P-ethyl, propargite, and isoxaflutole is 0.5-3:35-45:2-8; preferably, the mass ratio of quizalofop-P-ethyl, propargite, and isoxaflutole is 0.5-2:38-42:4-6; and preferably, the mass ratio of quizalofop-P-ethyl, propargite, and isoxaflutole is 1:40:5.

[0007] The herbicidal composition of the present invention contains pesticide excipients, and the weight percentage of active ingredients is 1-75%; preferably 20-60%.

[0008] The herbicidal composition of the present invention is formulated as a wettable powder, emulsifiable concentrate, microemulsion, or dispersible oil suspension; preferably, it is a dispersible oil suspension.

[0009] Agriculturally acceptable adjuvants include, but are not limited to: solvents, surfactants (such as wetting agents, dispersants, emulsifiers, and penetration modifiers), antifreeze agents, thickeners, adhesives, disintegrants, defoamers, and carriers.

[0010] The herbicidal composition of the present invention is used for the control of weeds in crop fields, especially for the control of weeds in rice fields such as barnyard grass, Echinochloa crus-galli, Paspalum notatum, Digitaria sanguinalis, and Setaria viridis.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: Compared to individual herbicides and binary compound combinations, the combined use of quizalofop-p-ethyl, propargite, and isoxaflutole enhances the control efficacy of the herbicides, exhibiting a significant synergistic effect against weeds such as barnyardgrass and foxtail millet. It also increases activity against barnyardgrass, but with an additive effect. The herbicidal combination demonstrates a significant synergistic effect, effectively reducing the dosage of active ingredients, slowing the development of resistance, and the prepared formulation exhibits excellent control efficacy against weeds in rice paddies.

[0012] The formulation prepared by this invention has excellent control effect on weeds in paddy fields, with a control efficacy of over 90%. In particular, the 46% dispersible oil suspension can significantly improve the field control efficacy of the agent. Detailed Implementation

[0013] The present invention will be further described below with reference to embodiments, but the present invention is not limited thereto. All raw materials used in this application are commercially available; unless otherwise specified, the percentages mentioned in the following embodiments are weight percentages.

[0014] I. Combined toxicity test The herbicidal activity of the herbicidal composition of the present invention was determined by “NY / T 1155.4-2006 Guidelines for Indoor Bioassays of Pesticides: Herbicides Part 4: Activity Assay Tests - Foliar Spray Method”.

[0015] Test targets: foxtail grass, crabgrass, barnyard grass; Test reagents: technical grade haloxyfop-R-methyl, propargyl, and isoxaflutole. When preparing the reagents, the technical grade was first dissolved in an appropriate amount of organic solvent (dimethylformamide + ethanol, volume ratio 1:2), and then diluted to the required concentration with a 1% Tween 80 aqueous solution.

[0016] Experimental Methods: Foxtail grass was sown in seedling pots and transplanted. When the weeds reached the 2-3 leaf stage, each treatment was sprayed, with four replicates per treatment. A control group without the pesticide was included. After the pesticide residue on the weed leaves air-dried naturally, the weeds were transferred to a greenhouse for conventional cultivation. The fresh weight and control efficacy of each treatment were assessed 14 days after treatment.

[0017] E: Fresh weight preventive effect; C: Fresh weight of the above-ground portion of the control weeds; T: Fresh weight of the above-ground portion of the processed weeds; Then evaluate the combined effect of the composition. E0 = X + Y(100-Y) / 100; when E-E0 > 10%, it is a synergistic effect; when E-E0 < -10%, it is an antagonistic effect; when the E-E0 value is between the theoretical value and ±10%, it is an additive effect. Test results: As shown in Table 1, compared with each single agent and the binary compound combination, the combined use of quizalofop-p-ethyl, propargite and isoxaflutole can enhance the control effect of the herbicide and show a significant synergistic effect on the weed barnyardgrass.

[0018] Table 1. Indoor control efficacy determination of herbicidal compositions against crabgrass.

[0019] As shown in Table 2, compared with each single agent and the binary compound combination, the combined use of quizalofop-p-ethyl, propargite and isoxaflutole can enhance the control effect of the herbicide and show a significant synergistic effect on the weed foxtail grass.

[0020] Table 2. Indoor control efficacy of herbicidal compositions against foxtail grass

[0021] As shown in Table 3, compared with each single agent and the binary compound combination, the combined use of quizalofop-p-ethyl, propargite and isoxaflutole can enhance the control effect of the agents. It shows an additive effect on weeds and barnyardgrass, but does not reach the level of synergistic effect.

[0022] Table 3. Indoor control efficacy of herbicidal compositions against barnyard grass

[0023] II. Field control efficacy of the herbicidal composition against weeds in paddy fields.

[0024] Experimental site overview: Rice was transplanted on May 31, 2023, and was in the 4-5 leaf stage. Target weeds present in the experimental site included barnyard grass, crabgrass, Echinochloa crus-galli, and foxtail.

[0025] Experimental design: There were 3 treatments, each with 4 replicates, for a total of 12 plots, each plot being 45m². 2 Each experimental plot is arranged in a randomized block design.

[0026] Test reagent: 46% wettable powder, containing the following ingredients by weight percentage: 1% quizalofop-p-ethyl, 40% propargite, 5% isoxaflutole, 6% chlorpyrifos BX, 2% NNO2, 4% silica, and 100% kaolin.

[0027] 46% emulsifiable concentrate, containing the following ingredients by weight percentage: 1% quizalofop-p-ethyl, 40% propargite, 5% isoxaflutole, 8% agricultural emulsifiable concentrate 500#, 4% Tween-80, 3% ethylene glycol, and soybean oil to make up 100%.

[0028] 46% dispersible oil suspension It contains the following ingredients by weight percentage: 1% quizalofop-p-ethyl, 40% propargite, 5% isoxaflutole, 8% Tween-80, 6% agricultural emulsion 1601, 1.5% NNO, 0.8% silica, and methyl oleate to make up 100%.

[0029] Application method: The pesticide was applied on June 11, 2023. At the time of application, the rice seedlings had recovered and turned green, and the weeds were in the germination to 2-3 leaf stage. The treatment was carried out by foliar spraying.

[0030] Survey Methods and Data Analysis: Four points were randomly selected from each community, each 0.25m apart. 2 For each quadrat, the fresh weight of the above-ground portion of weeds at each sampling point in each plot was recorded 14 days after application, and the fresh weight control efficacy was calculated according to the formula.

[0031] Fresh weight control efficacy / % = (fresh weight of weeds in blank control area - fresh weight of weeds in chemically treated area) / fresh weight of weeds in blank control area × 100.

[0032] Test results: Table 4 Field control efficacy of herbicidal compositions against weeds in rice paddies 46% wettable powder 45 90.2 b 46% emulsifiable concentrate 45 92.4 b 46% dispersible oil suspension 45 97.6 a CK - - As shown in Table 5, the 46% wettable powder, 46% emulsifiable concentrate and 46% dispersible oil suspension prepared by this invention have excellent control effects on weeds in paddy fields when the active ingredient dosage is 45g / mu, with a control efficacy of over 90%. In particular, the 46% dispersible oil suspension can significantly improve the field control efficacy of the agent and effectively reduce the dosage of active ingredient. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A herbicidal composition containing quizalofop-p-ethyl, propargite, and isoxaflutole, characterized in that, The mass ratio of quizalofop-p-ethyl, propargite, and isoxaflutole is 1:40:

5.

2. The herbicidal composition according to claim 1, characterized in that, It contains pesticide excipients, with the active ingredient accounting for 1-75% by weight.

3. The herbicidal composition according to claim 2, characterized in that, The weight percentage of active ingredients is 20-60%.

4. The herbicidal composition according to claim 3, characterized in that, The herbicidal composition is formulated as a wettable powder, emulsifiable concentrate, microemulsion, or dispersible oil suspension.

5. The herbicidal composition according to claim 4, characterized in that, The herbicidal composition is formulated as a dispersible oil suspension.

6. Use of the herbicidal composition according to any one of claims 1-5 for controlling weeds in crop fields.

7. The use according to claim 6, characterized in that, The crop mentioned is rice.

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