CN114532343B - Insecticidal composition containing oxazine and thiamethoxam - Google Patents
Insecticidal composition containing oxazine and thiamethoxam Download PDFInfo
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- CN114532343B CN114532343B CN202210212871.4A CN202210212871A CN114532343B CN 114532343 B CN114532343 B CN 114532343B CN 202210212871 A CN202210212871 A CN 202210212871A CN 114532343 B CN114532343 B CN 114532343B
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- thiamethoxam
- oxazine
- amide
- agent
- insecticidal composition
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- 239000005941 Thiamethoxam Substances 0.000 title claims abstract description 75
- NWWZPOKUUAIXIW-FLIBITNWSA-N thiamethoxam Chemical compound [O-][N+](=O)\N=C/1N(C)COCN\1CC1=CN=C(Cl)S1 NWWZPOKUUAIXIW-FLIBITNWSA-N 0.000 title claims abstract description 73
- 239000000203 mixture Substances 0.000 title claims abstract description 46
- 230000000749 insecticidal effect Effects 0.000 title claims abstract description 31
- BCHZICNRHXRCHY-UHFFFAOYSA-N 2h-oxazine Chemical compound N1OC=CC=C1 BCHZICNRHXRCHY-UHFFFAOYSA-N 0.000 title claims abstract description 27
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- 206010059866 Drug resistance Diseases 0.000 abstract description 7
- ADRRIUGXSOGPPW-UHFFFAOYSA-N 2h-oxazine-3-carboxamide Chemical compound NC(=O)C1=CC=CON1 ADRRIUGXSOGPPW-UHFFFAOYSA-N 0.000 description 38
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- 241000256602 Isoptera Species 0.000 description 2
- 241000255777 Lepidoptera Species 0.000 description 2
- 241001466030 Psylloidea Species 0.000 description 2
- 244000061456 Solanum tuberosum Species 0.000 description 2
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- 239000002518 antifoaming agent Substances 0.000 description 2
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- 230000005540 biological transmission Effects 0.000 description 1
- OOCMUZJPDXYRFD-UHFFFAOYSA-L calcium;2-dodecylbenzenesulfonate Chemical compound [Ca+2].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O.CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O OOCMUZJPDXYRFD-UHFFFAOYSA-L 0.000 description 1
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- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
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- 230000003020 moisturizing effect Effects 0.000 description 1
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- 239000003090 pesticide formulation Substances 0.000 description 1
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- 235000012015 potatoes Nutrition 0.000 description 1
- -1 pyrazole amide compound Chemical class 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- PYODKQIVQIVELM-UHFFFAOYSA-M sodium;2,3-bis(2-methylpropyl)naphthalene-1-sulfonate Chemical compound [Na+].C1=CC=C2C(S([O-])(=O)=O)=C(CC(C)C)C(CC(C)C)=CC2=C1 PYODKQIVQIVELM-UHFFFAOYSA-M 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
- A01N43/48—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with two nitrogen atoms as the only ring hetero atoms
- A01N43/58—1,2-Diazines; Hydrogenated 1,2-diazines
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N51/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds having the sequences of atoms O—N—S, X—O—S, N—N—S, O—N—N or O-halogen, regardless of the number of bonds each atom has and with no atom of these sequences forming part of a heterocyclic ring
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
The invention belongs to the field of pesticide, and in particular relates to an insecticidal composition containing oxazine and thiamethoxam and application thereof, wherein the active ingredients consist of oxazine and thiamethoxam, and the mass ratio of the oxazine to the thiamethoxam is 20:1-1:20; the insecticidal composition is used for controlling crop pests; the insecticidal composition has remarkable synergistic effect, can effectively reduce the dosage of active ingredients, and slows down the generation of drug resistance of pests.
Description
Technical Field
The invention belongs to the field of pesticide, and provides an insecticidal composition containing oxazine and thiamethoxam and application thereof.
Background
The oxazine amide is a pyrazole amide compound, and the English common name is as follows: dimropyridaz; trade name: axalion (tm); IUPAC name: 1- [ (1 RS) -1, 2-dimethylpropyl ] -N-ethyl-5-methyl-N-pyridazin-4-yl-1H-pyrazole-4-carboxamide; CAS accession number: 1403615-77-9; the molecular formula: C16H23N5O; the structural formula is as follows:
the product of the oxazine amide has excellent performance and better systemic conductivity. The insecticidal composition is mainly used for controlling pests such as lepidoptera (such as chilo suppressalis, asparagus caterpillar, plutella xylostella, spodoptera frugiperda and the like), coleoptera (such as beetles, corn root beetles, potato leaf beetles, yellow leaf beetles and the like), diptera (such as flies, mosquitoes, vegetable leaf miner and the like), hemiptera (such as aphids, plant hoppers, psyllids, whiteflies and the like), thysanoptera (such as thrips, frankliniella, palmi thrips, thrips and the like), isoptera (such as termites and the like), cockroaches, ants and the like, and is particularly effective on sucking mouthparts such as aphids, whiteflies, psyllids and the like.
Thiamethoxam belongs to a class of nicotinic insecticides that act by affecting synapses in the insect central nervous system, preventing transmission between nerve cells; the neonicotinoid insecticide has broad spectrum, high efficiency and good systemic property, and can be used for foliar spraying, seed treatment or soil treatment. After application, the plant can be absorbed by the roots or leaves of crops more quickly and is conducted to various parts of plants.
The long-term use of single insecticidal chemical components can easily lead to the improvement of the drug resistance of pests, and the dosage of the insecticide is continuously improved; in order to slow down the generation of drug resistance of pests, except for developing new pesticide varieties, pesticide compound forms are generally adopted by domestic pesticide companies at present, and no related report of combined use of oxazine amide and thiamethoxam exists in the prior art.
Disclosure of Invention
The invention aims to solve the technical problems of slowing down the generation of drug resistance of pests and reducing the dosage of active ingredients, and provides an insecticidal composition with remarkable synergistic effect, which comprises the following specific technical scheme:
the insecticidal composition containing the oxazine amide and the thiamethoxam comprises the active ingredients of the oxazine amide and the thiamethoxam, wherein the mass ratio of the oxazine amide to the thiamethoxam is 20:1-1:20. The mass ratio of the preferred oxazine amide to thiamethoxam is 20:1-1:5. The further preferable mass ratio of the oxazine amide to the thiamethoxam is 10:1-1:1
The insecticidal composition comprises agricultural auxiliary ingredients; the weight percentage of the active ingredients is 1-75%; the preferred percentage of active ingredient is 5-50%. The pesticide preparation is wettable powder, water dispersible granules, emulsifiable concentrate, aqueous emulsion, microemulsion, suspending agent and granules.
The specific embodiments of the pesticide formulation prepared from the pesticide composition of the invention are as follows:
the insecticidal composition is an emulsifiable concentrate preparation, and comprises the following components in percentage by mass: 1-50% of oxazine amide; 1-20% of thiamethoxam; 5-30% of an emulsifying agent; the balance of solvent. The specific production steps of the emulsifiable concentrate preparation are that the effective components of the oxazine and the thiamethoxam are added into a solvent to be completely dissolved, then an emulsifier is added into the solvent to be uniformly stirred to form uniform and transparent oily liquid, and the oily liquid is filled, so that the emulsifiable concentrate preparation of the composition can be prepared.
The insecticidal composition is a suspending agent, and comprises the following components in percentage by mass: 1-50% of oxazine amide; thiamethoxam 1-20%; 1-10% of dispersing agent; 1-10% of wetting agent; 1-5% of an antifreezing agent; 0.1-2% of thickener; 0.1-0.8% of defoaming agent; 0-10% of penetration enhancer; 0.1-5% of pH regulator; the balance of water. The specific production steps of the suspending agent are that other auxiliary agents are firstly mixed, evenly mixed by high-speed shearing, the active ingredients of the oxazine amide and thiamethoxam are added, and the suspending agent preparation of the composition of the invention can be prepared after grinding balls in a ball grinding machine for 2-3 hours to ensure that the particle diameters are below 5 mm.
The insecticidal composition is wettable powder and comprises the following components in percentage by mass: 1-50% of oxazine amide; 1-20% of thiamethoxam; 3-10% of dispersing agent; 1-5% of a wetting agent; and (3) filling and the balance. The specific production steps of the wettable powder are as follows: the composition of the invention can be prepared by mixing the effective components of the oxazine and the thiamethoxam as well as the dispersing agent, the wetting agent and the filler according to the formula, uniformly stirring the mixture in a stirring kettle, and uniformly mixing the mixture after passing through a jet mill.
The insecticidal composition is water dispersible granules, and comprises the following components in percentage by mass: 1-50% of oxazine amide; 1-20% of thiamethoxam; 3-10% of dispersing agent; 1-10% of a wetting agent; 1-5% of disintegrating agent; 1-5% of a binder; and (3) filling and the balance. The specific production steps of the water dispersible granule are as follows: the water dispersible granule of the composition is prepared by uniformly mixing the effective component oxazine amide, thiamethoxam, a dispersing agent, a wetting agent, a disintegrating agent and a filler according to the formula, crushing the mixture by an ultrafine jet mill, kneading the crushed mixture, adding the kneaded mixture into a fluidized bed granulation dryer for granulation, drying and screening, and then sampling and analyzing the mixture.
The insecticidal composition is an aqueous emulsion and comprises the following components in percentage by mass: 1-50% of oxazine amide; 1-20% of thiamethoxam; 3-30% of an emulsifying agent; 5-15% of a solvent; 2-15% of a stabilizer; 1-5% of an antifreezing agent; 0.1-8% of defoaming agent; 0.2-2% of thickener; water, balance. The specific production steps of the aqueous emulsion are as follows: firstly, adding the oxazine amide, thiamethoxam, a solvent, an emulsifier and a cosolvent together to dissolve the oxazine amide and the emulsifier into a uniform oil phase; mixing part of water, antifreeze, antimicrobial and other pesticide auxiliary agents together to form a uniform water phase; adding the oil phase into the water phase while stirring at high speed in a reaction kettle, slowly adding water until reaching a phase inversion point, starting a shearing machine to conduct high-speed shearing, adding the rest water, and shearing for about half an hour to form an oil-in-water type aqueous emulsion, thus obtaining the aqueous emulsion of the composition.
Wherein the auxiliary materials are common components in the field of pesticide preparations.
The use of the insecticidal composition for controlling crop pests. The crops comprise fruit trees, vegetables, soybeans, cotton, grains and potatoes. The pests include lepidoptera, coleoptera, diptera, hemiptera, thysanoptera pests. Preferably aphids or whiteflies.
Compared with the prior art, the invention has the beneficial effects that:
the mixed agent of the oxazine amide and the thiamethoxam has synergistic effect on soybean aphids when the mass ratio of the oxazine amide to the thiamethoxam is 20:1-1:1, and has excellent insecticidal effect. The mixture of the oxazine and the thiamethoxam has synergistic effect on bemisia tabaci when the mass ratio is 10:1-1:5, and has excellent insecticidal effect; can effectively reduce the dosage of the monomer active ingredients and slow down the generation of drug resistance of pests.
The insecticidal activity of the insecticide can be improved by mixing the oxazine and the thiamethoxam in a proper proportion, and the influence of the mixing proportion in the mixture on the insecticidal activity of the mixture is higher than that of the insecticide active ingredient.
The compound preparation of the oxazine and the thiamethoxam has excellent control effect on soybean aphids and cabbage bemisia tabaci.
Detailed Description
The following is a detailed description of the present invention by way of examples. In the present invention, the following examples are provided for better illustration of the present invention and are not intended to limit the scope of the present invention. Materials, reagents and the like used in the examples described below are commercially available unless otherwise specified.
Example 1 indoor bioassay of Metrozole amide and thiamethoxam complex on Soybean aphids
Test insect source: soybean aphids, the wing-free adult aphids with identical individuals are selected as test insects.
Test agent: oxazine amide; thiamethoxam;
the measuring method comprises the following steps: the virulence effect of the tested insecticide on soybean aphids is determined by adopting an immersion method. Controls were set up with 5 concentrations of each agent, each concentration being repeated 4 times. The winged aphids and the small-leaf aphids on the bean seedlings are removed, only wingless adult aphids and individual large wingless leaf aphids are reserved, then the bean seedlings are immersed in prepared liquid medicines with different concentrations for 10 seconds, after the leaf stalks of the bean seedlings are wrapped by absorbent cotton balls with good water absorption, the number of aphids is recorded, and after treatment, the bean seedlings are placed in an incubator for normal feeding, and after 48 hours, the death rate is checked. When in examination, the writing brush is used for lightly stirring the insect body, and if the insect body falls down and cannot stand up, the insect body is regarded as death.
Test conditions: temperature (25±1) °c, relative humidity around 75%, photoperiod L.D =16: 8.
data analysis: virulence regression equations, LC50 values, were calculated using splsl 6.0 biometric software.
Combined action analysis: the sun cloud Pei method is adopted: wherein CTC < 80 is antagonism, CTC 80-120 is addition, CTC 120 < is synergy. The specific calculation method is as follows:
mix observed virulence index (ATI) = (standard dose EC 50/mixed dose EC 50) ×100;
the mixed agent Theoretical Toxicity Index (TTI) =a agent toxicity index×the percentage of the a agent in the mixed agent+b agent toxicity index×the percentage of the B agent in the mixed agent;
co-toxicity coefficient (CTC) = (mix measured toxicity index (ATI)/mix Theoretical Toxicity Index (TTI)) ×100.
Test results:
LC50 values of the oxazine amide, thiamethoxam and the mixtures thereof on soybean aphids and their combined toxicity analysis are shown in table 1. Among the monomeric compounds, thiamethoxam, the insecticide, has a better effect of killing soybean aphids, and the LC50 value of thiamethoxam is 2.21 mug/ml. The mixed agent of the oxazine amide and the thiamethoxam with different proportions shows a certain insecticidal activity on soybean aphids; wherein the CTC values of the mixture of the oxazine amide and the thiamethoxam are 149.9, 144.7, 176.2 and 126.3 when the mass ratio of the oxazine amide to the thiamethoxam is 20:1, 10:1, 5:1 and 1:1 respectively; the synergistic effect is shown; CTC values of other ratios are equal to or more than 80 and equal to or less than 120 and are added; the combination of the oxazine and the thiamethoxam has no antagonism on soybean aphids. The mixed agent of the oxazine amide and the thiamethoxam has synergistic effect on soybean aphids when the mass ratio of the oxazine amide to the thiamethoxam is 20:1-1:1, has excellent insecticidal effect, can effectively reduce the dosage of monomer active ingredients, and slows down the generation of drug resistance of the soybean aphids.
The experimental results show that: the compound of the oxazine and the thiamethoxam has higher insecticidal activity on soybean aphids and has a synergistic effect; in the compound of the oxazine and the thiamethoxam, the oxazine and the thiamethoxam have additive effects when the mixing proportion of the oxazine is low, and have synergistic effects when the proportion of the oxazine and the thiamethoxam is high. The compound has the advantages that the insecticidal activity of the insecticide can be improved by mixing the oxazamate and the thiamethoxam in a proper proportion, and the influence of the mixing proportion of the oxazamate compound in the mixture on the insecticidal activity of the mixture is higher than that of the insecticide active ingredient.
Table 1: indoor combined action determination of oxazine amide and thiamethoxam on soybean aphids
Example 2: indoor bioassay of combination of oxazamide and thiamethoxam on bemisia tabaci
Test insect source: bemisia tabaci.
Test agent: oxazine amide; thiamethoxam;
the measuring method comprises the following steps: the toxicity effect of the tested insecticide on vegetable bemisia tabaci is measured by an agar moisturizing leaf dipping method. Controls were set up with 5 concentrations of each agent, each concentration being repeated 4 times. A round leaf disc with the diameter of 33mm is arranged on clean tomato leaves by using a centrifugal bottle cap, the round leaf disc is respectively immersed in each liquid medicine concentration for about 10s, the round leaf disc is taken out and naturally dried at room temperature, and the leaf backs are flatly paved on the surface of a gel layer in the centrifugal tube cap upwards, and when necessary, the periphery of the leaf disc is lightly pressed by using tweezers, so that the leaf disc is tightly combined with the surface of the gel layer. In the test, the open end of the straight pipe is lightly pressed downwards on the back of the plant blade, the front of the blade is lightly flicked by hands to promote the adult bemisia tabaci to fly into the pipe, each pipe is filled with 35-40 heads of insects, the centrifugal pipe cover with the leaf disc is buckled on the open end of the straight pipe with insects, the covered black cloth end faces downwards, and the straight pipe is placed in an illumination incubator to be raised (25+/-1) DEG C, and L: D=16:8. After the treatment, the results were checked for 48 hours, the adult with the appendage immobilized was marked as dead insect by lightly touching the insect body with a zero-number writing brush.
Data analysis: virulence regression equations, LC50 values, were calculated using splsl 6.0 biometric software.
Combined action analysis: the sun cloud Pei method is adopted: wherein CTC < 80 is antagonism, CTC 80-120 is addition, CTC 120 < is synergy. The specific calculation method is as follows:
mix observed virulence index (ATI) = (standard dose EC 50/mixed dose EC 50) ×100;
the mixed agent Theoretical Toxicity Index (TTI) =a agent toxicity index×the percentage of the a agent in the mixed agent+b agent toxicity index×the percentage of the B agent in the mixed agent;
co-toxicity coefficient (CTC) = (mix measured toxicity index (ATI)/mix Theoretical Toxicity Index (TTI)) ×100.
Test results:
LC50 values of the oxazamide, thiamethoxam and the mixtures thereof on bemisia tabaci and their combined toxicity analysis are shown in table 1. Among the monomeric compounds, thiamethoxam, the insecticide, has a better killing effect on bemisia tabaci, and the LC50 value of thiamethoxam is 10.80 mug/ml. The mixed agent of the oxazine amide and the thiamethoxam with different proportions shows a certain insecticidal activity on bemisia tabaci; wherein the CTC values of the mixture of the oxazine amide and the thiamethoxam are 136.1, 140.3, 127.1 and 129.2 when the mass ratio of the oxazine amide to the thiamethoxam is 10:1, 5:1, 1:1 and 1:5 respectively; the synergistic effect is shown; CTC values of other ratios are equal to or more than 80 and equal to or less than 120 and are added; the combination of the oxazine and the thiamethoxam has no antagonism on bemisia tabaci. The mixed agent of the oxazine and the thiamethoxam has synergistic effect on bemisia tabaci when the mass ratio of the oxazine to the thiamethoxam is 10:1-1:5, has excellent insecticidal effect, can effectively reduce the dosage of the monomer active ingredient, and slows down the generation of drug resistance of the bemisia tabaci.
The experimental results show that: the compound of the oxazine and the thiamethoxam has higher insecticidal activity on bemisia tabaci and has a synergistic effect; and the mixing proportion selects the pesticide activity of the mixture to have higher influence than the pesticide active ingredient.
Table 1: indoor combined action determination of oxazine amide and thiamethoxam compounded bemisia tabaci
Example 3: pesticide effect test of compound oxazine amide and thiamethoxam on soybean aphids in field
Test agent:
medicament 1:20% of oxazine amide thiamethoxam suspending agent: comprises the following components in percentage by weight:
10% of oxazine amide, 10% of thiamethoxam, 8% of wetting penetrating agent F, 4% of polycarboxylate, 2% of naphthalene sulfonic acid formaldehyde condensate sodium salt, 3% of xanthan gum, 1% of organic silicon, 1% of glycol and 100% of water.
Medicament 2:18% of oxazine amide thiamethoxam wettable powder: comprises the following components in percentage by weight:
15% of oxazine amide, 3% of thiamethoxam, 6% of nekal BX, 3% of calcium dodecyl benzene sulfonate, 2% of polycarboxylate, 3% of white carbon black and 100% of kaolin.
Medicament 3:33% of oxazine-thiamethoxam water dispersible granule: comprises the following components in percentage by weight:
30% of metaxazole amide, 3% of thiamethoxam, 5% of naphthalene sulfonic acid formaldehyde condensate sodium salt, 4% of sodium lignin sulfonate, 4% of sodium dodecyl sulfate, 3% of urea, 4% of carboxymethyl cellulose and 100% of kaolin.
The test method comprises the following steps: reference is made to the pesticide field efficacy test criterion part 27, pesticide control of cruciferous vegetable aphids. 4 cells are arranged in each treatment, 25m < 2 > of each cell is arranged, the cells are randomly distributed, the comparison adopts clear water treatment, and 1.5L of water is sprayed in each cell. 5-point sampling method is used for investigating aphid population, aphid population investigation is carried out before and after application for 1, 3 and 7 days, the number of the aphid population is more than 500 per cell, and the rate of reduction of the insect population and the correction control effect are calculated according to investigation results.
The rate of reduction of insect population = (number of live insects before administration-number of live insects after administration)/number of live insects before administration x 100%;
correction control = (treated rate of reduction of insect population-control rate of reduction of insect population)/(100-control rate of reduction of insect population) ×100%
Test results: the results of the field efficacy test of the compound of the oxazine and the thiamethoxam on the soybean aphids are shown in table 3. The compound preparation of the oxazine and the thiamethoxam has excellent prevention and control effects on soybean aphids; if the dosage of the medicament 1-3 is 3 g/mu, the control effect on soybean aphid after 7d is 96.8%, 92.5% and 85.0% respectively; has excellent control effect.
Table 3: pesticide effect test of compound oxazine amide and thiamethoxam on soybean aphids in field
Example 4: oxazine and thiamethoxam compounded field efficacy test for Gan Lanyan whitefly
Test agent: example 3 pharmaceutical agents 1-3
The test method comprises the following steps: 4 cells are arranged in each treatment, 45m < 2 > is arranged in each cell, the cells are randomly distributed, and clear water treatment is adopted for comparison. And adopting a fixed-point fixed-plant investigation method to investigate 10 cabbages in each cell at fixed points. The number of the adult bemisia tabaci is investigated before pesticide application, the total number of living insects on plants is investigated 7d, 14d and 21d after pesticide application, and the control effect of each pesticide treatment area is calculated;
the calculation formula is as follows: control effect (%) = [1- (number of live insects before drug treatment in the blank control area×number of live insects after drug treatment in the drug treatment area)/(number of live insects after drug treatment in the blank control area×number of live insects before drug treatment area) ]×100.
Test results: the results of the field efficacy test of the compound of the oxazamate and thiamethoxam on Gan Lanyan whiteflies are shown in Table 3. The compound preparation of the oxazine and the thiamethoxam has excellent control effect on cabbage bemisia; if the dosage of the medicament 1-3 is 4 g/mu, the control effect on soybean aphid after 14d is 90.6%, 88.5% and 92.0% respectively; the prevention and treatment of 21d after the medicine still reach 85.2%, 85.8% and 87.3%.
Table 4: oxazine and thiamethoxam compounded field efficacy test for Gan Lanyan whitefly
Variations and modifications to the above would be obvious to those of ordinary skill in the art to which the invention pertains, based on the foregoing disclosure and teachings. Therefore, the invention is not limited to the specific embodiments disclosed and described above, but some modifications and changes of the invention should be also included in the scope of the claims of the invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (1)
1. The application of the insecticidal composition containing the oxazine and the thiamethoxam in preventing and controlling the bemisia tabaci is characterized in that the insecticidal composition is 33% of oxazine-thiamethoxam water dispersible granules and comprises the following components in percentage by weight: 30% of metaxazole amide, 3% of thiamethoxam, 5% of naphthalene sulfonic acid formaldehyde condensate sodium salt, 4% of sodium lignin sulfonate, 4% of sodium dodecyl sulfate, 3% of urea, 4% of carboxymethyl cellulose and 100% of kaolin.
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