Weeding composition and application thereof

Abstract

The invention belongs to the technical field of pesticide weeding, and discloses a weeding composition and application thereof.The weeding composition comprises an active component A and an active component B. The active component A is isoxafop-butyl, the active component B is any one of metamifop, cyhalofop-butyl, clodinafop-propargyl and pinoxaden, and the active component B is one of isoxafop-butyl, cyhalofop-butyl, clodinafop-propargyl and pinoxaden. The mass ratio of the active component A to the active component B is (1: 12)-(24: 1). The weeding composition disclosed by the invention is wide in weed control spectrum and can be used for comprehensively preventing and controlling various weeds in rice fields and wheat fields.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticide weeding and discloses a weeding composition and application thereof. Background Art

[0002] Metamifop, international common name: metamifop, chemical name: (2R)-2-[4-[(6-chloro-1,3-benzoxazol-2-yl)oxy]phenoxy]-N-(2-fluorophenyl)-N-methylpropionamide, belongs to the aromatic oxyphenoxy propionate herbicide, which can inhibit acetyl-CoA carboxylase (ACC enzyme) and promote plant fatty acid synthesis. That is, it is used as an acetyl-CoA carboxylase inhibitor for stem and leaf treatment of rice fields to control various weeds such as crabgrass, barnyard grass, and lycopodiella cuneata. The drug is absorbed by the stems and leaves, and is transmitted to the growth point through the vascular bundle to achieve a weed control effect.

[0003] Cyhalofop-butyl, international common name: cyhalofop-butyl (D), chemical name: (2R)-2-[4-(4-cyano-2-fluorophenoxy)phenoxy] propionate butyl ester, CAS registration number: 122008-85-9. It belongs to the oxyphenoxypropionic acid class of systemic herbicides, which are rapidly transmitted in the plant body and rapidly degraded into a series of metabolites: cyanoxalic acid (ACID), cyanoxamide (AMIDE), cyanoxalic acid (DIACID) and cyanoxol (DP), among which ACID is a compound with herbicidal activity. ACID accumulates in the intercalary meristem of weeds, thereby effectively inhibiting the enzyme acetyl-CoA carboxylase, which is necessary for the biosynthesis of fatty acids in the body, to achieve the purpose of weed control.

[0004] Clodinafop-propargyl, international common name: clodinafop-propargyl (D), chemical name: (2R)-2-[4-(5-chloro-3-fluoropyridin-2-yl)oxyphenoxy]propionate, CAS registration number: 105512-06-9, belongs to the aromatic oxygen phenoxy propionic acid herbicide, which can effectively inhibit the biosynthesis of esters to become acetyl co-sensitizer A hydroxylase inhibitors. It is mainly used to control wild oats, wild oats, oats, ryegrass, common bluegrass, foxtail grass, etc.

[0005] Pinoxaden, international common name: pinoxaden, chemical name: [8-(2,6-diethyl-4-methylphenyl)-7-oxo-1,2,4,5-tetrahydropyrazolo[1,2-d][1,4,5]oxadiazepine-9-yl] 2,2-dimethylpropionate, CAS registration number: 243973-20-8. It belongs to the new phenylpyrazoline herbicide and is an inhibitor of acetyl-CoA carboxylase (ACC). It causes the inhibition of fatty acid synthesis, stops cell growth and division, destroys the lipid-containing structure of the cell membrane, and causes the weeds to die. Production method. Pinoxaden has the characteristics of systemicity and fast action speed. It can prevent and control a variety of grass weeds in wheat fields, including some difficult and fast-growing species, especially hard grass, weed grass, cob grass, foxtail grass, Japanese foxtail grass, mutant foxtail grass, and foxtail grass in winter wheat fields.

[0006] Chemical weed control is the most effective measure for weed control today. The long-term and large-scale use of relatively limited chemical herbicides has led to the rapid development of resistant weeds in my country's farmland. These weeds are characterized by a wide distribution, many species, rapid population succession, and high levels of resistance. This has posed a serious threat to my country's farmland weed control, ecological environment, and food security, and has attracted widespread attention. Summary of the invention

[0007] The object of the present invention is to provide a herbicidal composition with reasonable components, low drug cost, obvious synergistic effect, good weed control effect, wide weed control spectrum and safety to crops.

[0008] Another object of the present invention is to provide a formulation of the herbicidal composition.

[0009] Another object of the present invention is to provide the use of the above composition for controlling weeds in rice fields or wheat fields.

[0010] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: a herbicidal composition, the herbicidal composition comprises an active ingredient A and an active ingredient B, the active ingredient A is isoxadiazole, the active ingredient B is any one of oxadiazole, cyhalofop-butyl, clodinafop-butyl, and pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:12 to 24:1, or any value within the above numerical range.

[0011] Furthermore, the active ingredient B is oxadiazine, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 24:1, or any value within the above numerical range;

[0012] The active ingredient B is cyhalofop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 24:1, or any value within the above numerical range;

[0013] The active ingredient B is clodinafop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 24:1, or any value within the above numerical range;

[0014] The active ingredient B is pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 16:1, or any value within the above numerical range.

[0015] Furthermore, the active ingredient B is oxadiazine, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 16:1, or any value within the above numerical range;

[0016] The active ingredient B is cyhalofop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 16:1, or any value within the above numerical range;

[0017] The active ingredient B is clodinafop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 16:1, or any value within the above numerical range;

[0018] The active ingredient B is pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:3 to 8:1, or any value within the above numerical range.

[0019] Furthermore, the active ingredient accounts for 0.1% to 80% of the total weight of the composition, or any value within the above numerical range.

[0020] Furthermore, the herbicidal composition comprises active ingredients and pesticide auxiliary ingredients, and can be prepared into any formulation suitable for use in agriculture.

[0021] Furthermore, the dosage form of the preparation is a solid preparation or a liquid preparation.

[0022] Furthermore, the solid preparation is a wettable powder, and the liquid preparation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, an aqueous emulsion, or a suspension concentrate.

[0023] The present invention also discloses the use of the herbicidal composition as described above for controlling unwanted plants.

[0024] Furthermore, the growth environment of the unwanted plants is a rice field or a wheat field.

[0025] Furthermore, the unwanted plants are grass weeds, and the grass weeds are barnyard grass, Leptochloa chinensis, Paspalum distachyon, Goosegrass, wild oats, Setaria viridis, Alopecurus mume, and Poa annua.

[0026] Beneficial effects of the present invention:

[0027] The herbicidal composition of the present invention has reasonable components, good herbicidal effect, low drug cost, and its herbicidal 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 herbicidal composition of the present invention has a good control effect on grass weeds in rice and wheat fields. DETAILED DESCRIPTION

[0028] 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.

[0029] The following preparation examples are prepared as follows:

[0030] Emulsifiable concentrate: according to the formula ratio, the measured active ingredients, solvents and co-solvents are added into a mixing kettle and stirred to dissolve them, then an emulsifier is added, and the balance is supplemented with the remaining solvent, and the mixture is stirred evenly in a stirring kettle, and filtered to obtain the desired emulsifiable concentrate of the present invention.

[0031] Dispersible oil suspension: according to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, oil is added and mixed evenly, and the dispersible oil suspension product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0032] Microemulsion: According to the formula ratio, the active ingredients, solvents, emulsifiers, etc. are mixed to obtain the oil phase, and the antifreeze agent is mixed with water to obtain the water phase. The oil phase is added to the water phase under stirring and stirred evenly. The shearing is continued for 10 minutes, and then the defoaming agent is added and stirred evenly to obtain oil phase particles with small droplets of 0.01 to 0.1 microns, that is, the microemulsion product is obtained.

[0033] Emulsion in water: According to the formula ratio, the active ingredients are dissolved in the solvent and the emulsifier is added to make it dissolve into a uniform oil phase. Deionized water, antifreeze, etc. are mixed together to form a uniform water phase. Under high-speed shearing, the oil phase is added to the water phase. After shearing to a qualified particle size, the defoamer, thickener, and preservative are added and stirred evenly to form a well-dispersed emulsion in water product.

[0034] Suspension concentrate: According to the formula ratio, the active ingredients, surfactants and other functional additives are placed in the reactor in sequence, water is added to mix evenly, and the suspension concentrate product is obtained by high-speed shearing, wet sand grinding, and finally homogenization filtration.

[0035] Wettable powder: Active ingredients, dispersants, wetting agents and fillers are mixed according to the formula ratio, stirred evenly in a stirring kettle, and crushed and mixed evenly for multiple times by a jet mill to prepare the wettable powder of the composition of the present invention.

[0036] Preparation Example 1: 17% isoxadiazole·oxadiazole EC (16:1)

[0037] Formula: 16% isoxadiazole, 1% oxadiazole, 30% propylene carbonate, 8% polyoxyethylene sorbitan monooleate, 2% castor oil polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, and rosin-based vegetable oil to make up the balance.

[0038] Preparation Example 2: 15% isoxadiazole·oxadiazole dispersible oil suspension (4:1)

[0039] Formula: 12% isoxadiazole, 3% oxadiazole, 2% lignin sulfonate, 12% tristyrylphenol polyoxyethylene ether polyoxypropylene ether, 4% Guerbet alcohol polyoxyethylene ether, 2% sodium lauryl sulfate, 1% silicon dioxide, 1% organic bentonite, 18% 200# solvent oil, methyl oleate to make up the balance

[0040] Preparation Example 3: 27% isoxadiazole·oxadiazole wettable powder (2:1)

[0041] Formula: 18% isoxadiazole, 9% oxadiazole, 4% succinate sulfonate, 3% naphthalene sulfonate formaldehyde condensate, 2% BX powder, 5% white carbon black, and kaolin to make up the balance.

[0042] Preparation Example 4: 9% isoxazolidinone·cyhalofop-butyl emulsifiable concentrate (2:1)

[0043] Formula: 6% isoxazolidinone, 3% cyhalofop-butyl, 25% acetophenone, 8% ethylene glycol oxyethylene polyoxypropylene ether, 5% phenethylphenol polyoxyethylene polyoxypropylene ether, 3% calcium dodecylbenzene sulfonate, and methyl oleate makes up the balance.

[0044] Preparation Example 5: 25% isoxadiazole·cyhalofop-butyl dispersible oil suspension (1:4)

[0045] Formula: 5% isoxazolidinone, 20% cyhalofop-butyl, 3% fatty alcohol polyoxyethylene ether, 10% alkylphenol formaldehyde resin polyoxyethylene ether, 1% sodium lauryl sulfate, 1% sodium salt of polycarboxylic acid, 1% naphthalenesulfonate formaldehyde condensate, and soybean oil makes up the balance.

[0046] Preparation Example 6: 25% isoxadiazole·cyhalofop-butyl emulsion in water (4:1)

[0047] Formula: 20% isoxazolidinone, 5% cyhalofop-butyl, 5% xylene, 15% cyclohexanone, 1% BHT, 1% polyoxyethylene sorbitan monooleate, 5% ethylene oxide-propylene oxide copolymer, 5% ethylene glycol, 0.05% silicone defoamer, 0.1% xanthan gum, 0.1% potassium benzoate, and deionized water to make up the balance.

[0048] Preparation Example 7: 9% isoxadiazole·cyhalofop-butyl microemulsion (1:2)

[0049] Formula: 3% isoxazolidinone, 6% cyhalofop-butyl, 12% xylene, 15% cyclohexanone, 12% alkyl aromatic polyoxyethylene ether polyoxypropylene ether, 5% EO-PO block copolymer, 1% fatty alcohol polyoxyethylene ether sodium sulfate, 4% ethylene glycol, 0.05% silicone defoamer, and deionized water to make up the balance.

[0050] Preparation Example 8: 34% isoxadiazole·cyhalofop-butyl wettable powder (16:1)

[0051] Formula: 32% isoxazolidinone, 2% cyhalofop-butyl, 2% sodium lauryl sulfate, 3% alkyl naphthalene sulfonate, 5% sodium polynaphthaldehyde sulfonate, 8% kaolin, 10% white carbon black, and bentonite makes up the balance.

[0052] Preparation Example 9: 15% isoxadiazole·clodinafop-butyl EC (2:1)

[0053] Formula: 10% isoxadiazole, 5% clodinafop-butyl, 18% propylene glycol methyl ether, 15% ethylene glycol oxyethylene polyoxypropylene ether, 2% sodium lauryl sulfate, 10% DMF, and methyl oleate makes up the balance.

[0054] Preparation Example 10: 12% isoxadiazole·clodinafop-butyl dispersible oil suspension (1:3)

[0055] Formula: 3% isoxadiazole, 9% clodinafop-butyl, 2% phenethylphenol polyoxyethylene polyoxypropylene ether, 12% styrenephenol polyoxyethylene ether phosphate, 2% calcium dodecylbenzenesulfonate, 3% succinate sulfonate, 1.5% magnesium aluminum silicate, 1% Tesco 869, and corn oil makes up the balance.

[0056] Preparation Example 11: 10% isoxadiazole·clodinafop-butyl emulsion in water (4:1)

[0057] Formula: 8% isoxadiazole, 2% clodinafop-butyl, 6% sorbitan oleate polyoxyethylene ether, 1% alkylphenol formaldehyde resin polyoxyethylene ether sulfate, 20% cyclohexanone, 0.2% xanthan gum, 5% ethylene glycol, 0.1% sodium benzoate, 0.5% silicone oil, and deionized water to make up the balance.

[0058] Preparation Example 12: 14% isoxadiazole·clodinafop-butyl microemulsion (1:6)

[0059] Formula: 2% isoxadiazole, 12% clodinafop-butyl, 20% cyclohexanone, 10% Guerbet alcohol polyoxyethylene ether, 5% sorbitan oleate polyoxyethylene ether, 1% styrenated phenol polyoxyethylene ether sulfate, 0.1% silicone defoamer, and deionized water to make up the balance.

[0060] Preparation Example 13: 25% isoxadiazole·clodinafop-butyl wettable powder (24:1)

[0061] Formula: 24% isoxadiazole, 1% clodinafop-butyl, 4% sodium lignin sulfonate, 5% sodium alkyl polyoxyethylene ether sulfonate, 2% BX powder, 5% white carbon black, and kaolin to make up the balance.

[0062] Preparation Example 14: 16% isoxadiazole-piperidin EC (1:3)

[0063] Formula: 4% isoxadiazole, 12% pinoxadiazole, 10% dimethyl sulfoxide, 10% isotridecyl alcohol polyoxyethylene ether, 2% calcium dodecylbenzene sulfonate, 18% propylene carbonate, and xylene to make up the balance.

[0064] Preparation Example 15: 15% isoxadiazole·pizofenoxadone dispersible oil suspension (2:3)

[0065] Formula: 6% isoxadiazole, 9% pinoxadiazole, 1% naphthalenesulfonate formaldehyde condensate, 10% glycerol fatty acid ester polyoxyethylene ether, 5% fatty alcohol polyoxyethylene ether, 2% calcium dodecylbenzenesulfonate, 1% silicon dioxide, 1% organic bentonite, and methyl oleate makes up the balance.

[0066] Preparation Example 16: 17% isoxadiazole·pizofenoxadone suspension (16:1)

[0067] Formula: 16% isoxadiazole, 1% pinoxadiazole, 1% fatty alcohol polyoxyethylene ether, 2% alkyl aryl polyoxyethylene ether polyoxypropylene ether, 1% naphthalene sulfonate formaldehyde condensate, 4% styrene phenol polyoxyethylene ether phosphate, 1.5% magnesium aluminum silicate, 0.1% carboxyethyl cellulose, 1% sodium sorbate, 5% ethylene glycol, 0.5% silicone oil, and deionized water to make up the balance.

[0068] Indoor joint test

[0069] Example 1: Indoor joint action test of isoxadiazole, oxadiazole and cyhalofop-butyl on common weeds in wheat fields

[0070] Test basis: The test refers to NY / T-1155.4-2006 "Guidelines for Indoor Bioassay Tests of Pesticides-Herbicides Part 4: Activity Determination Test Stem and Leaf Spray Method".

[0071] Test targets: Echinochloa crusgalli, Leptochloa chinensis, Paspalum distachyon, and Eleocharis chinensis.

[0072] Instruments and equipment: light incubator, quantitative spray equipment, electronic balance, pot, pipette, etc.;

[0073] Test soil: The test used air-dried loam with an organic matter content of ≤3%, neutral pH, good air permeability, and screened.

[0074] Test materials: quantitatively fill the test soil to 4 / 5 of the pot, and then use infiltration irrigation from the bottom of the pot to make the soil completely wet to saturation. Pre-treated test weed seeds are evenly sown on the soil surface, and covered with 0.5cm to 2cm of soil according to the size of the seeds. After sowing, move them into the greenhouse for conventional cultivation and use bottom infiltration irrigation for watering. After the weeds emerge, thin out the seedlings and determine the number of plants to ensure the density of the weeds is suppressed.

[0075] Test drugs: isoxadiazole technical, clodinafop-butyl technical, and pinoxaden technical.

[0076] Preparation of medicine: dissolve the above raw medicine in a suitable solvent, and then dilute it with 0.1% Tween 80 aqueous solution.

[0077] Chemical treatment: According to the experimental design, the stem and leaf spray treatment was carried out from low dose to high dose. Each treatment was repeated 4 times, and the treatment without chemical was set as a blank control. After the treatment, the chemical solution on the surface of the test material was naturally air-dried and moved into the greenhouse for conventional cultivation.

[0078] Investigation: The herbicidal activity was recorded by the absolute value investigation method 14 days after treatment.

[0079] Calculation method:

[0080] Fresh weight control effect E = (fresh weight of control area - fresh weight of treatment area) × 100 / fresh weight of control area

[0081] The combined effect of the mixture was determined by the Gowing method, and the calculation formula is as follows:

[0082] Theoretical control effect of mixture E0 = weed control effect of herbicide A at dosage P + weed control effect of herbicide B at dosage Q - weed control effect of herbicide A at dosage P × weed control effect of herbicide B at dosage Q ÷ 100

[0083] Evaluation criteria for the combined effects of mixed drugs:

[0084] E-E0>10% is a synergistic effect, E-E0<-10% is an antagonistic effect, and E-E0 between ±10% is an additive effect.

[0085] Test results:

[0086] Table 1 Results of indoor biological activity test on isoxadiazole and clodinafop-butyl against barnyardgrass

[0087]

[0088] The results of indoor tests showed that the combination of isoxadiazole and clodinafop-butyl exhibited a synergistic effect on barnyard grass in a mass ratio of 1:6 to 24:1; the synergistic effect on barnyard grass was most significant when the mass ratio of isoxadiazole to clodinafop-butyl was 4:1.

[0089] Table 2 Results of indoor biological activity test on the combination of isoxadiazole and clodinafop-butyl with Leptochloa crus-gal

[0090]

[0091]

[0092] The results of indoor tests showed that the combination of isoxadiazole and clodinafop-butyl exhibited a synergistic effect on Leptochloa chinensis in a mass ratio of 1:12 to 24:1; the synergistic effect on Leptochloa chinensis was most significant when the mass ratio of isoxadiazole to clodinafop-butyl was 2:1.

[0093] Table 3 Results of indoor biological activity test on the combination of isoxadiazole and pinoxadiazole on Paspalum distachyon

[0094]

[0095] The results of indoor tests showed that the combination of isoxafoamide and pinoxafoetida had a synergistic effect on Paspalum distachyon in a mass ratio of 1:12 to 24:1; the synergistic effect on Paspalum distachyon was most significant when the mass ratio of isoxafoamide to pinoxafoetida was 2:3.

[0096] Table 4 Results of indoor biological activity test of isoxadiazole and pinoxadiazole on Glechoma longituba

[0097]

[0098] The results of indoor tests showed that the combination of isoxaclostrobin and pinoxaclostrobin exhibited a synergistic effect on goosegrass in a mass ratio range of 1:12 to 24:1; the synergistic effect on goosegrass was most significant when the mass ratio of isoxaclostrobin to pinoxaclostrobin was 1:3.

[0099] Example 2: Indoor joint action test of isoxadiazole, clodinafop-butyl and pinoxadiazole on common weeds in rice fields

[0100] Test basis: The test refers to NY / T 1155.9-2008 "Guidelines for Indoor Bioassay of Pesticides - Herbicides Part 9: Paddy Field Herbicide Activity Determination Test - Stem and Leaf Spray Method".

[0101] Test instruments: light incubator, spray equipment, electronic balance, pipette.

[0102] Target weeds: Wild oats, Setaria viridis, Alopecuroides australis, Poa annua.

[0103] Test agents: isoxadiazine technical, oxadiazine technical, cyhalofop-butyl technical.

[0104] Test soil: The test used sieved air-dried sandy loam with an organic matter content of ≤4%, neutral (pH 6.0-8.0), and good permeability.

[0105] Test preparation: quantitatively fill the test soil to 4 / 5 of the pot, and use top watering to make the soil completely moist to saturation. Evenly sow the pre-treated test weed seeds on the soil surface, cover with 0.5cm to 2cm of soil according to the seed size, keep the soil fully moist after sowing, move into the greenhouse for normal management, and cultivate the weeds until the appropriate leaf stage for spray treatment.

[0106] Preparation of the drug: Dissolve the above test drugs in a suitable solvent and dilute with 0.1% Tween-80 aqueous solution. Set 5 series of doses according to the characteristics of the drug.

[0107] Chemical treatment: spray treatment from low dose to high dose according to the experimental design. Each treatment was repeated 4 times, and the treatment without chemical was set as blank control. Keep the soil moist after treatment and move to the greenhouse for normal management.

[0108] Experimental investigation: The weed growth status was checked and recorded regularly after treatment, and the fresh weight of the aboveground part of each treatment was investigated by the absolute value investigation method 21 days after treatment.

[0109] Calculation method:

[0110] Fresh weight control effect E = (fresh weight of control area - fresh weight of treatment area) × 100 / fresh weight of control area

[0111] The combined effect of the mixture was determined by the Gowing method, and the calculation formula is as follows:

[0112] Theoretical control effect of mixture E0 = weed control effect of herbicide A at dosage P + weed control effect of herbicide B at dosage Q - weed control effect of herbicide A at dosage P × weed control effect of herbicide B at dosage Q ÷ 100

[0113] Evaluation criteria for the combined effects of mixed drugs:

[0114] E-E0>10% is a synergistic effect, E-E0<-10% is an antagonistic effect, and E-E0 between ±10% is an additive effect.

[0115] Test results:

[0116] Table 5 Results of indoor biological activity test on wild oats with isoxadiazole and oxadiazole

[0117]

[0118] The results of indoor tests showed that the combination of isoxadiazole and oxadiazole exhibited a synergistic effect on wild oats in the mass ratio range of 1:4 to 24:1; the synergistic effect on wild oats was most significant when the mass ratio of isoxadiazole to oxadiazole was 2:1.

[0119] Table 6 Results of indoor biological activity test of isoxadiazole and oxadiazole on Setaria viridis

[0120]

[0121]

[0122] The results of indoor tests showed that the combination of isoxadiazole and oxadiazole exhibited a synergistic effect on Setaria viridis in a mass ratio of 1:4 to 24:1; the synergistic effect on Setaria viridis was most significant when the mass ratio of isoxadiazole to oxadiazole was 4:1.

[0123] Table 7 Results of indoor biological activity test on the combination of isoxazolidinone and cyhalofop-butyl on Alopecurus paniculatus

[0124]

[0125] The results of indoor tests showed that the combination of isoxazolidinone and cyhalofop-butyl exhibited a synergistic effect on Alopecurus nucifera in a mass ratio of 1:4 to 24:1; the synergistic effect on Alopecurus nucifera was most significant when the mass ratio of isoxazolidinone to cyhalofop-butyl was 4:1.

[0126] Table 8 Results of indoor biological activity test on the combination of isoxazolidinone and cyhalofop-butyl with bluegrass

[0127]

[0128] The results of indoor tests showed that the combination of isoxazolidinone and cyhalofop-butyl had a synergistic effect on Poa annua in a mass ratio of 1:4 to 16:1; the synergistic effect on Poa annua was most significant when the mass ratio of isoxazolidinone to cyhalofop-butyl was 1:2.

[0129] Example 3: Efficacy test of controlling weeds in wheat fields

[0130] Test site: The test site is located in Erpu Village, Banqiao Town, Fengyang County, Anhui Province. The test site has medium to high fertility, and the soil is yellow-brown loam, slightly acidic. When applying the pesticide, wheat has 2 to 3 tillers, and gramineous weeds have 1 to 2 tillers. The weeds in the test site are mainly gramineous weeds such as Alopecuroides, Aegilops tauschii, Glechoma longituba, and Oats. There are also some Chickweed and Shepherd's Purse, which are small in number and unevenly distributed.

[0131] Experimental design: The experiment set up 8 treatments, including 7 drug treatments and 1 blank control treatment. All experimental plots were arranged in random blocks, each treatment was repeated 4 times, and the plot area was 20m 2 .

[0132] Test method: A Biaohe electric backpack sprayer was used for stem and leaf spraying. Absolute value survey method was used 20 days and 40 days after spraying. Samples were taken at 4 points in each plot, and the sampling area of ​​each point was 0.25m 2 , statistics 1m 2 The number of weeds remaining in the soil was counted and the control effect per plant was calculated. The fresh weight of various weeds was measured 40 days after the application. The control effect per plant and the control effect by fresh weight were calculated.

[0133] Efficacy calculation formula:

[0134]

[0135] Regular observations after application of the medicine revealed no evidence of yellowing leaves, wheat seedling death, growth stagnation or other pesticide damage in the wheat fields.

[0136] Test results:

[0137] Table 9 Results of efficacy test on weed control in wheat fields

[0138]

[0139] It can be seen from Table 9 that 20 days after application, the comprehensive plant control efficacy of the combination of isoxadiazole and pinoxaden was 82.93%~90.60%; the comprehensive plant control efficacy of the combination of isoxadiazole and clodinafop-butyl was 85.86%~89.69%; 40 days after application, the comprehensive plant control efficacy of the combined preparation was 86.53%~95.07%, and the comprehensive fresh weight control efficacy was 86.08%~95.04%.

[0140] Example 4: Efficacy test of controlling weeds in rice fields

[0141] Experimental location: This experiment was conducted in Luocheng Town, Wanzai County, Jiangxi Province, a traditional rice-producing area. The experimental fields had good soil and fertilizer conditions, convenient drainage and irrigation, and the field surface was plowed and leveled. The cultivation and water and fertilizer management conditions of each experimental plot were consistent and in line with local agricultural production practices.

[0142] Target weeds: mainly Leptochloa chinensis and Echinochloa crusgalli. The weed density in rice fields is relatively high and the distribution is relatively uniform.

[0143] Experimental design: The experiment has 8 treatments, each with 4 replicates, a total of 32 plots, and a plot area of ​​20m 2 , each plot was arranged in random blocks.

[0144] Application time and method: The test was conducted when direct-seeded rice was at the 3-5 leaf stage, barnyard grass was at the 2-3 leaf stage, and Leptochloa chinensis was at the 2-3 leaf stage. Linong HD-400 backpack sprayer was used for application, and the stem and leaf spray method was used for uniform spraying. Drain the water 1 day before application, rehydrate 1 day after application, and keep the water for 7 days. Field management after application was the same as other direct-seeded fields.

[0145] Survey method: 15 days and 30 days after application, the control effect of different treatments on field weeds was investigated. Four points were randomly selected in each plot, and 0.25m 2 , a total of 1m 2 . The number of surviving weeds was investigated 15 days after the application of the drug, and the control efficiency was calculated. The number of surviving weeds was investigated 30 days after the application, and the control efficiency was calculated. The weeds in the sampling points were pulled out, and the fresh weight was weighed to calculate the weed fresh weight control efficiency.

[0146] Efficacy calculation formula:

[0147]

[0148] Table 10 Results of efficacy test on controlling weeds in rice fields

[0149]

[0150] As shown in the table above, when the active ingredient of the compound preparation of isoxadiazole + oxadiazole, isoxadiazole + cyhalofop-butyl is 70g / hm2, 2 15 days after application, the plant control efficacy against all weeds in rice fields was 84.84% to 90.92%; 30 days after application, the comprehensive plant control efficacy against weeds in the four treatments of compound preparations was above 89%, and the fresh weight control efficacy was above 90%, which was significantly higher than that of the single-dose control.

[0151] Although the present invention has been described in detail above with general descriptions and specific implementation schemes, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention are within the scope of protection claimed by the present invention.

Claims

1. A herbicidal composition, characterized in that The herbicidal composition comprises an active ingredient A and an active ingredient B, wherein the active ingredient A is isoxadiazole, and the active ingredient B is any one of oxadiazole, cyhalofop-butyl, clodinafop-butyl, and pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:12 to 24:

1.

2. The herbicidal composition according to claim 1, characterized in that The active ingredient B is metamifop, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 24:1; The active ingredient B is cyhalofop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 24:1; The active ingredient B is clodinafop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 24:1; The active ingredient B is pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 16:

1.

3. The herbicidal composition according to claim 2, characterized in that The active ingredient B is metamifop, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 16:1; The active ingredient B is cyhalofop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:4 to 16:1; The active ingredient B is clodinafop-butyl, and the mass ratio of the active ingredient A to the active ingredient B is 1:6 to 16:1; The active ingredient B is pinoxaden, and the mass ratio of the active ingredient A to the active ingredient B is 1:3 to 8:

1.

4. The herbicidal composition according to claim 1, characterized in that The active ingredient accounts for 0.1% to 80% of the total weight of the composition.

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 solid preparation is a wettable powder, and the liquid preparation is an emulsifiable concentrate, a dispersible oil suspension, a microemulsion, an aqueous emulsion, or a suspension.

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

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

10. The use according to claim 9, characterized in that: The unwanted plants are grass weeds, and the grass weeds are barnyard grass, Leptochloa chinensis, Paspalum distachyon, Goosegrass, wild oats, Setaria viridis, Alopecuroides australis, and Poa annua.

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