A herbicidal composition and its application

Abstract

The present invention belongs to the technical field of pesticide weed control, and discloses a herbicidal composition, the composition comprising active ingredients of imazapic and oxadiazon, wherein the mass ratio of the active ingredients of imazapic to oxadiazon is 3:2 to 1:16. The herbicidal composition of the present invention can solve the problems of single performance of herbicides in peanut fields, succession of weed communities, and difficulty in controlling a variety of malignant weeds such as Amaranthus ferox and Ramie, and has the beneficial effects of a wide weed control spectrum, high weed control efficiency, low use cost, etc., is safe for crops such as peanuts, has little effect on subsequent crops, and can significantly delay and control the occurrence of weed resistance and weed community succession.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide compounding, and in particular relates to a weed killing composition and application thereof. Background Art

[0002] Peanut is a major oil and cash crop in my country, and plays an important role in the development of the national economy. At present, the peanut planting area in my country is stable at more than 4.5 million hectares all year round, with a total output of about 1,600 tons. There are three types of weeds in peanut fields: annual weeds, biennial weeds, and perennial weeds. Annual weeds are widely distributed and cause serious damage, mainly including crabgrass, goosegrass, foxtail grass, barnyard grass, iron amaranth, amaranth, purslane, quinoa, cyperus angustifolia, and cyperus dimorphus; biennial weeds mainly include shepherd's purse and ground lettuce, and perennial weeds include prickly lettuce, white grass, and horsetail.

[0003] With the continuous improvement of scientific farming level, chemical weeding in peanut fields has become the main weeding technology. Under normal circumstances, chemical weeding can increase pod production by more than 10% compared with manual weeding, and it saves time and effort. Chemical weeding is more thorough, and can prevent and control weeds between peanut plants and weeds around plants that are difficult to eradicate by manual or mechanical weeding, and can also reduce diseases and insect pests. In short, chemical weeding is not only one of the important ways to improve labor productivity, but also an important part of agricultural modernization. However, due to the long-term application of a single herbicide or herbicides with similar mechanisms of action, weed resistance has increased, making weeding more difficult and aggravating the harm of weeds.

[0004] Reasonable compounding of herbicides is an effective method to improve the control effect, expand the weed control spectrum, delay weed resistance, reduce environmental pollution, reduce the cost of use and reduce herbicide residues. The applicant unexpectedly found that the mixture of imipenem and oxadiazon, which have different mechanisms of action, has a significant synergistic control effect on common weeds in peanut fields such as crabgrass, barnyard grass, foxtail grass, Amaranthus retroflexus, Chenopodium album, Solanum nigrum, Cyperus rotundus, Cyperus rotundus, etc., which can significantly improve the control effect of weeds in peanut fields, and also has the advantages of reducing the amount of medicine used and reducing the cost of control, while improving the safety of crops. And after searching, no reports have been found on the mixture of imipenem and oxadiazon. Summary of the invention

[0005] The object of the present invention is to provide a herbicide composition containing imazapic acid and oxadiazon which has reasonable components, low drug cost, obvious synergistic effect, good weed control effect, wide weed control spectrum and is safe for crops.

[0006] Another object of the present invention is to provide a herbicidal composition formulation containing imazapic-pyridamole and oxadiazon.

[0007] Another object of the present invention is to provide use of the above composition for controlling weeds in peanut fields.

[0008] In order to achieve the above object, the present invention adopts the following technical scheme: a herbicidal composition, wherein the active ingredients of the herbicidal composition are imazapic acid and oxadiazon;

[0009] Furthermore, the mass ratio of the active ingredient imazapic acid to oxadiazon is 3:2 to 1:16;

[0010] Furthermore, the mass ratio of the active ingredient imazapic acid to oxadiazon is 3:2 to 1:8;

[0011] Furthermore, when the dosage of the active ingredient of imazapic in the herbicidal composition is 10 to 60 g / hectare and the dosage of the active ingredient of oxadiazon is 40 to 160 g / hectare, the mass ratio of imazapic to oxadiazon is 3:2 to 1:16.

[0012] Furthermore, the dosage of the active ingredient of imazapic in the herbicidal composition is 10-60 g / hectare, the dosage of the active ingredient of oxadiazon is 40-160 g / hectare, and the mass ratio of imazapic to oxadiazon is 3:2-1:8.

[0013] Furthermore, when the active ingredients imazapyr and oxadiazon are used to control grass weeds in effective amounts of 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), and 60+160 (3:8) g / hectare, the combined action type is synergistic;

[0014] Furthermore, when the active ingredients imazapic acid and oxadiazon are used to control grass weeds, the preferred mass ratio is 3:2 to 1:16;

[0015] Furthermore, when the active ingredients imazapic acid and oxadiazon are used to control grass weeds, the preferred mass ratio is 3:2 to 1:8;

[0016] Furthermore, the grass weeds are one or more of crabgrass, barnyard grass, and foxtail grass;

[0017] The herbicidal composition, wherein the active ingredients imazapic acid and oxadiazon are used in an effective amount of 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), 60+160 (3:8) g / hectare for controlling broadleaf weeds, has a synergistic effect;

[0018] In the herbicidal composition, the active ingredients of imazapic acid and oxadiazon are preferably in a mass ratio of 3:2 to 1:8 for controlling broadleaf weeds;

[0019] Furthermore, the broadleaf weeds are one or more of Amaranthus retroflexus, Chenopodium album, and Solanum nigrum;

[0020] The herbicidal composition, wherein the active ingredients imazapic acid and oxadiazon are in an effective amount of 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), 60+160 (3:8) g / hectare for controlling sedge weeds, has a synergistic effect;

[0021] In the herbicidal composition, the active ingredients of imazapic acid and oxadiazon are preferably in a mass ratio of 3:2 to 1:8 for controlling sedge weeds;

[0022] Furthermore, the Cyperaceae weeds are one or both of Cyperus rotundus and Cyperus angustifolia.

[0023] Furthermore, the herbicidal composition contains, in addition to the active ingredients imazapic and oxadiazon, agriculturally permitted pesticide auxiliary ingredients; the pesticide auxiliary ingredients include one or more of adjuvants, carriers, and solvents;

[0024] Furthermore, the auxiliary agent is one or more of an emulsifier, a dispersant, a wetting agent, a spreader, an adhesive, a stabilizer, a synergist, a thickener, a penetrant, a defoamer, a preservative, a safener, etc.;

[0025] Furthermore, the content of each component in the herbicidal composition is 1%-50% of imazapic acid, 1%-50% of oxadiazon, 1%-20% of adjuvant, and the solvent or carrier makes up 100%.

[0026] Furthermore, the herbicidal composition comprises active ingredients and pesticide auxiliary ingredients, and can be prepared into any formulation suitable for use in agriculture;

[0027] Furthermore, the dosage form is a solid preparation or a liquid preparation;

[0028] Furthermore, the solid preparation is a direct-use solid preparation, a dispersible solid preparation or a soluble solid preparation;

[0029] Furthermore, the solid preparation for direct use is a powder, granule, pellet, tablet or strip;

[0030] The dispersible solid preparation is a wettable powder, an oil-dispersible powder, an emulsion powder, a water-dispersible granule, an emulsion granule or a water-dispersible tablet;

[0031] The soluble solid preparation is a soluble powder, a soluble tablet or a soluble granule;

[0032] Furthermore, the liquid preparation is a solution preparation, a dispersed liquid preparation, an emulsion preparation, a suspension preparation or a multiphase preparation;

[0033] Furthermore, the solution preparation is a soluble solution, a soluble gel, an oil or a film-spreading oil;

[0034] The dispersed liquid preparation is an emulsifiable concentrate, a latex, a dispersible liquid or an ointment;

[0035] The emulsion preparation is a water emulsion, an oil emulsion, a microemulsion or a lipid preparation;

[0036] The suspension preparation is a suspension concentrate, a microcapsule suspension concentrate, an oil suspension concentrate or a dispersible oil suspension concentrate;

[0037] The multiphase preparation is a suspoemulsion, a microcapsule suspension-suspension concentrate, a microcapsule suspension-water emulsion or a microcapsule suspension-suspoemulsion;

[0038] Furthermore, the liquid preparation is a suspension, and the solid preparation is a water dispersible granule.

[0039] The present invention also discloses the use of the herbicidal composition as described above for controlling unwanted plants;

[0040] Further, the growth site of the unwanted plants is a peanut field;

[0041] Further, the unwanted plants are grass weeds and / or broadleaf weeds and / or sedge weeds;

[0042] Furthermore, the grass weeds are one or more of Digitaria, Echinochloa crusgalli, and Setaria viridis; the broadleaf weeds are one or more of Amaranthus retroflexus, Chenopodium album, and Solanum nigrum; and the Cyperus weeds are one or two of Cyperus rotundus and Cyperus rotundus.

[0043] Beneficial effects of the present invention:

[0044] The invention has reasonable components, good weed control effect, low drug cost, and its weed control activity is not a single superposition of active ingredients, but has a significant synergistic effect, can delay the generation of weed resistance, is safe for crops, and meets the safety requirements of pesticide preparations. The invention has a good control effect on grass weeds, broad-leaved weeds, and sedge weeds such as crabgrass, barnyard grass, foxtail grass, Amaranthus retroflexus, Chenopodium album, Solanum nigrum, Cyperus rotundus, and Cyperus rotundus in peanut fields. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the present invention more concise and clear, the present invention is described with the following specific embodiments, but the present invention is by no means limited to these embodiments. The embodiments described below are only preferred embodiments of the present invention, which can be used to describe the present invention and cannot be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0046] Preparation Example 1: 25% imazapyr·oxadiazon water dispersible granules (3:2)

[0047] Formula: 15% of imipenem, 8% of oxadiazon, 10% of sodium lignin sulfonate, 2.5% of sodium polycarboxylate, 1.5% of sodium dodecylbenzene sulfonate, 4.5% of white sugar, and kaolin to make up the balance.

[0048] Preparation method: according to the formula ratio of the embodiment, the active ingredients of imazapic acid and oxadiazon are added to the carrier, and the surfactant and other functional additives are added thereto, mixed, and after air flow pulverization, 10-25% of water is added, and then kneading, granulation, drying, and sieving are performed to obtain a water-dispersible granule product; or the pulverized powder is sprayed with water in a boiling granulator, granulated, dried, and then sieved to obtain the product.

[0049] Preparation Example 2: 28% imazapyr·oxadiazon water dispersible granules (3:4)

[0050] Formula: 12% of imazapic acid, 16% of oxadiazon, 8% of naphthalenesulfonate formaldehyde condensate, 1.5% of BX powder, 10% of ammonium sulfate, and starch makes up the balance.

[0051] Preparation method: Same as Preparation Example 1.

[0052] Preparation Example 3: 15% imazapyr·oxadiazon suspension (1:4)

[0053] Formula: 3% of imazapyr, 12% of oxadiazon, 1.5% of polyoxyethylene isocyanate, 4% of alkylphenol polyoxyethylene ether phosphate, 2% of alkylaryl polyoxyethylene ether polyoxypropylene ether, 1% of sodium salt of polycarboxylate, 0.5% of xanthan gum, 2% of sodium benzoate, 5% of ethylene glycol, 0.5% of silicone oil, and deionized water to make up the balance;

[0054] Preparation method: according to the formula ratio, the active ingredients of imazapic acid and oxadiazon, surfactants and other functional additives are placed in a reaction kettle in sequence, water is added to mix evenly, and the suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0055] Preparation Example 4: 22% imazapyr·oxadiazon suspension (3:8)

[0056] Formula: 6% of imazapic acid, 16% of oxadiazon, 0.5% of alkylphenol polyoxyethylene ether, 4% of alkylphenol polyoxyethylene ether phosphate, 2% of sodium lignin sulfonate, 0.25% of xanthan gum, 0.5% of magnesium aluminum silicate, 4% of propylene glycol, 1% of sodium sorbate, 0.5% of silicone oil, and deionized water to make up the balance;

[0057] Preparation method: Same as Preparation Example 4.

[0058] Indoor joint test

[0059] Example 1: Combined test of imazapic acid and oxadiazon against common weeds in peanut fields

[0060] Test basis: NY / T 1155.3-2006 "Guidelines for Indoor Bioassay Tests of Pesticides-Herbicides Part 3: Activity Determination Test-Soil Spray Method".

[0061] Test targets: Crabgrass (Digitaria sanguinalis), barnyard grass (Echinochloa crus-galli), foxtail grass (Setaria viridis), Amaranthus retroflexus, Chenopodium, Solanum nigrum, Cyperus rotundus, Cyperus iria.

[0062] Test material preparation: Fill the test soil to 4 / 5 of the pot, and use the bottom of the pot to infiltrate and irrigate to make the soil completely moist. Spread the germinated weed seeds evenly on the soil surface, and cover with 0.5-2.0cm of soil (depending on the seed size). Spray the soil 24 hours after sowing.

[0063] Test agents: 97% imipenem technical, 95% oxadiazon technical, all of which were provided by the R&D center of Hailier Pharmaceutical Group.

[0064] Preparation of medicine: dissolve the original medicine with acetone, and then dilute it with 0.1% Tween 80 aqueous solution. Set 5 series of dosages according to the activity of the medicine.

[0065] Chemical treatment: spray treatment was carried out in order from low dose to high dose according to the experimental design. Each treatment was repeated 4 times, and a treatment without chemical was set as a blank control.

[0066] After treatment, the plants were moved to the greenhouse for routine cultivation and water was replenished by infiltration irrigation from the bottom of the pots. The temperature and humidity digital recorder was used to record the dynamic data of temperature and humidity in the greenhouse during the experiment.

[0067] Data survey: 21 days after treatment, the fresh weight of weeds was investigated and the control effect was calculated.

[0068] The Gowing method was used to evaluate the combined action type and appropriate ratio of two pesticides on weeds.

[0069] Fresh weight control effect (%) = (fresh weight of the aboveground part of weeds in the control area - fresh weight of the aboveground part of weeds in the treatment area) / fresh weight of the aboveground part of weeds in the control area × 100

[0070] Theoretical efficacy formula after mixing the two agents:

[0071] E0=X+Y(100-X) / 100

[0072] In the formula: X and Y are the actual protective effects of a single agent (%); E0 is the theoretical protective effect (%); E is the actual protective effect after the two agents are mixed (%).

[0073] The criteria for judging the type of combined action: E-E0>10% is a synergistic effect; E-E0<-10% is an antagonistic effect; E-E0 between ±10% is an additive effect. The test results are as follows:

[0074] Table 1 The combined effect of imazapic acid and oxadiazon on grass weeds

[0075]

[0076] As can be seen from Table 1, when imipenem and oxadiazon are used to control grass weeds, the indoor combined effects are additive or synergistic. When the dosage of imipenem and oxadiazon is 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), and 60+160 (3:8), the indoor combined effects on the three grass weeds are all synergistic, that is, when the mass ratio of imipenem to oxadiazon is 3:2-1:8 (the dosage of the active ingredient of imipenem in the herbicidal composition is 10-60 g / hectare, and the dosage of the active ingredient of oxadiazon is 40-160 g / hectare), the indoor combined action type for grass weeds is synergistic.

[0077] Table 2 Combined effects of imazapic acid and oxadiazon on broadleaf weeds

[0078]

[0079]

[0080] As can be seen from Table 2, when imazapic acid and oxadiazon are used to control broadleaf weeds, the indoor combined action is additive or synergistic. When the dosage of imazapic acid and oxadiazon is 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), and 60+160 (3:8), the indoor combined action of the two active ingredients on the three broadleaf weeds is synergistic, that is, when the mass ratio of imazapic acid to oxadiazon is 3:2 to 1:8 (the dosage of the active ingredient of imazapic acid in the herbicidal composition is 10 to 60 g / hectare, and the dosage of the active ingredient of oxadiazon is 40 to 160 g / hectare), the indoor combined action type for broadleaf weeds is synergistic.

[0081] Table 3 The combined effect of imazapic acid and oxadiazon on sedge weeds

[0082]

[0083] As can be seen from Table 3, when imipenem and oxadiazon are used to control sedge weeds, the indoor combined effects are additive or synergistic. When the dosage of imipenem and oxadiazon is 10+40 (1:4), 10+80 (1:8), 30+40 (3:4), 30+80 (3:8), 30+160 (3:16), 60+40 (3:2), 60+80 (3:4), 60+160 (3:8), the indoor combined effects on sedge weeds are all synergistic, that is, when the mass ratio of imipenem to oxadiazon is 3:2-1:8 (the dosage of the active ingredient of imipenem in the herbicidal composition is 10-60 g / hectare, and the dosage of the active ingredient of oxadiazon is 40-160 g / hectare), the indoor combined action type for sedge weeds is synergistic.

[0084] Field efficacy test

[0085] Embodiment 2:

[0086] The field efficacy test for controlling weeds in peanut fields was conducted in Laixi City, Shandong Province in 2020.

[0087] The test and control drugs and the dosage of the active ingredients are shown in the table below.

[0088] The experimental crop was peanut, the subsequent crop was wheat, and the control targets were conventional weeds in peanut fields.

[0089] Experimental design: The experimental field is flat, the soil is loam, and the fertility is medium. The different treatment plots of the experiment are arranged in random blocks, and the conventional spray method is used. Each plot is 20 square meters. The plots are arranged in random blocks. Peanuts were sown on April 15, 2020, and the soil was sprayed after sowing.

[0090] Survey time and method: Sampling survey was conducted at 4 points on the diagonal of the plot, with an area of ​​0.25 square meters at each point, and the weed species and number of plants were recorded. The safety of the test agent on peanuts was investigated 15 days after application, the plant control effect was investigated 20 days after application, the plant control effect and fresh weight control effect were investigated 40 days after application, and the yield of peanut fields was measured during the harvest period. Wheat was sown after peanuts were harvested, and the field was managed normally without the application of any herbicides. The emergence rate of wheat was investigated, and the growth of wheat was observed by visual inspection.

[0091] Test result calculation method:

[0092] Control effect % = [number of weeds in the blank control area (fresh weight) - number of weeds in the treatment area (fresh weight)] / number of weeds in the blank control area (fresh weight) × 100

[0093] Yield increase rate % = (yield of treatment area - yield of manual weeding control area) / yield of manual weeding control area × 100

[0094] Results and Analysis:

[0095] Fifteen days after treatment, all treatments had no adverse effects on peanut growth relative to the blank control area.

[0096] 20 days after application, the protective efficacy of each treatment plant is shown in Table 4.

[0097] 40 days after application, the protective efficacy and fresh weight efficacy of each treatment plant are shown in Tables 5 and 6.

[0098] The results of the yield test on the peanut field during the harvest period are shown in Table 7.

[0099] Table 4 20-day control effect of each treatment on peanut field

[0100]

[0101] Table 5 Effect of each treatment on peanut field after 40 days

[0102]

[0103]

[0104] Table 6 Effect of each treatment on fresh weight of peanut field after 40 days

[0105]

[0106] Table 7 Effects of each treatment on peanut yield

[0107]

[0108] Table 8 Effects of each treatment on subsequent crop wheat

[0109]

[0110] Field trials showed that the treatment of the mixture of imazapic and oxadiazon had a plant control effect of more than 85% on common weeds in peanut fields such as crabgrass, quinoa, and cyperus rotundus 20 days after application (Table 4); the plant control effect was more than 80% 40 days after application (Table 5); the fresh weight control effect was more than 88% 40 days after application (Table 6); when the yield of peanuts was measured at the time of harvest, each treatment of the mixture of imazapic and oxadiazon had an increase of about 10% (Table 7). It was safe for peanuts at the test dose and had little impact on subsequent crops.

[0111] In summary, the activity and herbicidal effect of the composition of the present invention are not just a simple superposition of the activities of each component. Compared with the existing single preparations, it has excellent control effect on various weeds in peanut fields, significant synergistic effect, can delay resistance, has less pesticide residue, good safety, and meets the safety requirements of pesticide preparations.

Claims

1. A herbicidal composition, characterized in that The herbicidal composition comprises active ingredients of imazapic and oxadiazon, and the mass ratio of the active ingredients imazapic to oxadiazon is 3:2 to 1:

8.

2. The herbicidal composition according to claim 1, characterized in that The dosage of the active ingredient of imazapic in the herbicidal composition is 10-60 g / hectare, the dosage of the active ingredient of oxadiazon is 40-160 g / hectare, and the mass ratio of imazapic to oxadiazon is 3:2-1:

8.

3. The herbicidal composition according to claim 1, characterized in that The percentage of the active ingredients imazapic acid and oxadiazon in the total weight of the composition is 1% to 90%.

4. The herbicidal composition according to claim 1, characterized in that The percentage of the active ingredients imazapic acid and oxadiazon in the total weight of the composition is 10% to 80%.

5. The herbicidal composition according to claim 1, characterized in that The herbicidal composition comprises active ingredients and pesticide auxiliary ingredients, and can be prepared into any formulation suitable for use in agriculture.

6. The herbicidal composition according to claim 5, characterized in that The dosage form of the preparation is a solid preparation or a liquid preparation.

7. The herbicidal composition according to claim 6, characterized in that The liquid preparation is a suspension, and the solid preparation is a water-dispersible granule.

8. Use of the herbicidal composition according to any one of claims 1 to 7 for controlling unwanted plants.

9. The use according to claim 8, characterized in that: The growth environment of the unwanted plants is a peanut field.

10. The use according to claim 8, characterized in that: The unwanted plants are grass, broadleaf or sedge weeds, the grass weeds are one or more of crabgrass, barnyard grass and foxtail grass; the broadleaf weeds are one or more of Amaranthus retroflexus, Chenopodium album and Solanum nigrum; the sedge weeds are one or two of Cyperus rotundus and Cyperus rotundus.

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