An insecticidal composition containing methoxyfenozide

Abstract

The present application relates to the technical field of pesticides, and discloses a kind of methoxyfenozide-containing insecticidal composition, specifically to a kind of methoxyfenozide and deltamethrin insecticidal composition for controlling pests is applied, the sweet potato night moth of the pests.The insecticidal composition is composed of methoxyfenozide, deltamethrin, adjuvant and other excipients, and is made into suspension concentrate, wherein the weight ratio of methoxyfenozide and deltamethrin is 27:3~3:19.The insecticidal composition can improve the efficiency of pesticide use, improve the effect of controlling sweet potato night moth, has obvious synergistic effect, reduces the amount of pesticide use, reduces the cost of farmers' medication, and is beneficial to environment, food safety and environmental protection.

Description

Technical Field

[0001] This invention belongs to the field of pesticide technology, specifically relating to the application of an insecticidal composition containing methoxyfenozide for the control of pests. Background Technology

[0002] Methoxyfenozide is a second-generation diacylhydrazine insect growth regulator with highly selective insecticidal activity against lepidopteran pests. It lacks penetrating and systemic activity through the phloem, primarily acting as a stomach poison. It also possesses some contact and ovicidal activity. Like other diacylhydrazine insecticides such as cyclofenozide, chlorfenapyr, and tebufenozide, methoxyfenozide is a molting hormone agonist. It causes lepidopteran larvae to cease feeding, accelerating the molting process and leading to premature death before maturity. Unlike molting inhibitors, this drug has the opposite mechanism of action and can be applied throughout the larval stage for pest control.

[0003] Deltamethrin is an organic compound with the molecular formula C22H19Br2NO3, and is a white, oblique, prismatic crystal. It is almost insoluble in water at room temperature but soluble in many organic solvents. It is relatively stable to light and air. It is relatively stable in acidic media but unstable in alkaline media. Deltamethrin is one of the most toxic pyrethroid insecticides to insects, possessing both contact and stomach poison effects. Its contact action is rapid and has a strong knockdown effect. It lacks fumigation and systemic action, and at high concentrations, it has a repellent effect on some pests. Its residual effect is long (7–12 days).

[0004] The beet armyworm (Spodoptera exigua (Hübner, 1808), also known as the corn armyworm, is a lepidopteran insect belonging to the family Noctuidae. It is an omnivorous pest that damages over 170 plant species, including corn, cotton, beets, sesame, peanuts, tobacco, soybeans, cabbage, Chinese cabbage, tomatoes, cowpeas, and onions. The larvae damage leaves. Newly hatched larvae initially feed on the eggshell before emerging from the hairs. First and second instar larvae often congregate on the underside of leaves, feeding on the leaf tissue and leaving only the epidermis, creating a paper-like appearance. Third instar larvae disperse and may also feed on the bracts, causing notches or holes in the leaves. Fourth instar larvae begin to feed voraciously, and in severe infestations, they can completely defoliate the leaves, leaving only the leaf blade and veins. Larvae older than the third instar can also bore into ears of fruit, causing them to rot. Summary of the Invention

[0005] The purpose of this invention is to provide an insecticidal composition containing methoxyfenozide.

[0006] The technical solution of this invention is:

[0007] An insecticidal composition containing methoxyfenozide, characterized in that: the composition consists of methoxyfenozide, deltamethrin, adjuvants and other excipients, and is prepared as a suspension, wherein the weight ratio of methoxyfenozide to deltamethrin is 9:1 to 1:1, preferably 19:3.

[0008] Furthermore, the effective active ingredient content of methoxyfenozide and deltamethrin is 11% to 44%, with a preferred effective active ingredient content of 22%.

[0009] Furthermore, the insecticidal composition can be used on a variety of crops, such as cruciferous vegetables, corn, peanuts, soybeans, cotton, etc.

[0010] Furthermore, the additives and excipients are selected from one or more of dispersants, wetting agents, antifreeze agents, preservatives, defoamers, pH adjusters, thickeners, and water.

[0011] The dispersant is selected from one or more of the following: alkylnaphthalene formaldehyde condensate sulfonate, alkylphenol polyoxyethylene ether phosphate, alkylphenol polyoxyethylene ether sulfonate, phenethylphenol polyoxyethylene ether phosphate, alkyl polyoxyethylene ether sulfonate, polyoxyethylene polyoxypropylene ether block copolymer, separating powder, dodecyl polyoxyethylene ether phosphate, fatty alcohol polyoxyethylene ether phosphate, nonylphenol polyoxyethylene ether phosphate, naphthalene sulfonate formaldehyde condensate sodium salt block copolymer, comb-type polycarboxylate, sodium polycarboxylate, and lignin sulfonate; the wetting agent is selected from alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, phenethylphenol polyoxyethylene ether phosphate, alkyl sulfate, alkyl sulfonate, alkylnaphthalene sulfonate, alkylphenol formaldehyde resin polyoxyethylene ether, triphenylethylphenol polyoxypropylene polyoxyethylene block copolymer. The product comprises one or more of the following: block polymer, sodium dodecyl sulfate, styrene-phenol-formaldehyde resin-propylene oxide block polyether, castor oil polyoxyethylene ether, fatty alcohol polyoxyethylene ether, alkyl glycoside, and sodium fatty alcohol polyoxyethylene ether sulfonate; the antifreeze is selected from one or more of ethylene glycol, propylene glycol, glycerol, urea, polyethylene glycol, and sorbitol; the preservative is sodium benzoate; the defoamer is a silicone defoamer, C10-20 saturated fatty acid compound, C8-10 fatty alcohol, hexanol, butanol, and octanol; the pH adjuster is selected from one or more of glacial acetic acid, citric acid, and triethanolamine; and the thickener is selected from one or more of xanthan gum, magnesium aluminum silicate, silica, polyvinyl alcohol, carboxymethyl cellulose, carboxyethyl cellulose, and methyl cellulose.

[0012] Furthermore, the preparation method of the composition involves first adding the additives and excipients, the active ingredient, and water into a mixing tank and shearing them at high speed to fully disperse them and form a preliminary dispersion; then, it is transported to a sand mill by a diaphragm pump for pulverization, adjusting the sand mill feed speed and confirming that the particle size meets the requirements; finally, the slurry is transported to a mixing tank, thickeners and defoamers are added to adjust the viscosity of the material, and samples are taken for quality testing to obtain the finished product.

[0013] Furthermore, the effective ingredient dosage of the insecticidal composition is 16.5–49.5 g / ha.

[0014] When the composition is formulated into a suspension, it includes the following components and contents in percentage: methoxyfenozide 5.5%–39.6%, deltamethrin 1.1%–22%, dispersant 1%–10%, wetting agent 1%–10%, defoamer 0.01%–2%, thickener 0.2%–2%, antifreeze 0%–10%, preservative 0%–1%, pH adjuster 0%–2%, and water as the balance.

[0015] The main technical indicators of the suspending agent of this invention are as follows:

[0016]

[0017] Compared with the prior art, the composition of the present invention has the following beneficial effects: (1) Compared with single agents, the composition has a significant synergistic effect on spinach beet armyworm and significantly improves the control effect; (2) It is low in toxicity and high in efficiency, reduces the amount of pesticides used, reduces the amount of pesticide residues on crops, and has a short safety interval; (3) It has both fast-acting and long-acting effects. Detailed Implementation

[0018] The present invention will be further described below with reference to the embodiments. The percentages in the embodiments are all percentage content ratios, but the present invention is not limited thereto.

[0019] First, the additives, excipients, methoxyfenozide, deltamethrin, and water are added to a mixing tank and sheared at high speed to fully disperse them, forming a preliminary dispersion. Then, the dispersion is transported to a sand mill by a diaphragm pump for pulverization. The feed speed of the sand mill is adjusted to ensure that the particle size meets the requirements. Finally, the slurry is transported to a mixing tank, where thickeners and defoamers are added to adjust the viscosity of the material. Samples are taken for quality testing to obtain the finished product.

[0020] Application Example 1

[0021] Example 1: 22% Methoxyfenozide·Deuterium cypermethrin suspension

[0022] A 22% methoxyfenozide·deltamethrin suspension was prepared by adding 19.39% of 98% methoxyfenozide technical grade, 3.06% of 98% deltamethrin technical grade, 3% of fatty alcohol polyoxyethylene ether phosphate, 2% of sodium polycarboxylate, 4% of sodium dodecyl sulfate, 3% of fatty alcohol polyoxyethylene ether, 0.4% of C8-10 fatty alcohols, 0.4% of magnesium aluminum silicate, 2% of glycerol, 0.3% of citric acid, 1% of sodium benzoate, and water to 100%.

[0023] Example 2: 22% Methoxyfenozide·Deuterium cypermethrin suspension

[0024] A 22% methoxyfenozide·deltamethrin suspension was prepared by adding 19.39% of 98% methoxyfenozide technical grade, 3.06% of 98% deltamethrin technical grade, 6% of nonylphenol polyoxyethylene ether phosphate, 2% of alkyl glycoside, 4% of triphenylethylphenol polyoxypropylene polyoxyethylene block polymer, 0.5% of silicone compound, 0.2% of xanthan gum, 0.2% of polyvinyl alcohol, 5% of urea, 0.5% of glacial acetic acid, and water to 100%.

[0025] Example 3: 22% Methoxyfenozide·Deuterium cypermethrin suspension

[0026] A 22% methoxyfenozide·deltamethrin suspension was prepared by adding 19.39% of 98% methoxyfenozide technical grade, 3.06% of 98% deltamethrin technical grade, 3% of polyoxyethylene polyoxypropylene ether block copolymer, 2% of dodecyl polyoxyethylene ether phosphate, 6% of sodium fatty alcohol polyoxyethylene ether sulfonate, 0.7% of C10-20 saturated fatty acid compounds, 0.5% of carboxymethyl cellulose, 4% urea, and water to 100%.

[0027] Example 4: 22% Methoxyfenozide·Deuterium cypermethrin suspension

[0028] A 22% methoxyfenozide·deltamethrin suspension was prepared by adding 19.39% of 98% methoxyfenozide technical grade, 3.06% of 98% deltamethrin technical grade, 5% lignin sulfonate, 4% alkylphenol polyoxyethylene ether formaldehyde condensate sulfate, 1% fatty alcohol polyoxyethylene ether, 0.4% silicone defoamer, 4% propylene glycol, 1.5% silica, and water to 100%.

[0029] Example 5: 11% Methoxyfenozide·Deuterium cypermethrin suspension

[0030] An 11% methoxyfenozide·deltamethrin suspension was prepared by adding 10.10% of 98% methoxyfenozide technical grade, 1.12% of 98% deltamethrin technical grade, 3% of alkyl polyoxyethylene ether sulfonate, 4% of alkylphenol formaldehyde resin polyoxyethylene ether, 0.5% hexanol, 1.5% methylcellulose, 3% urea, and water to 100%.

[0031] Example 6: 30% Methoxyfenozide·Deuterium Cypermethrin Suspension

[0032] A 30% methoxyfenozide·deltamethrin suspension was prepared by adding 15.31% of 98% methoxyfenozide technical grade, 15.31% of 98% deltamethrin technical grade, 4% of sodium salt block copolymer of naphthalenesulfonic acid formaldehyde condensate, 2% of sodium fatty alcohol polyoxyethylene ether sulfonate, 2% of phenethylphenol polyoxyethylene ether phosphate, 0.2% butanol, 0.2% xanthan gum, 3% polyethylene glycol, 0.2% sodium benzoate, and water to 100%.

[0033] Example 7: 44% Methoxyfenozide·Deuterium Cypermethrin Suspension Concentrate

[0034] A 44% methoxyfenozide·deltamethrin suspension was prepared by adding 38.78% 98% methoxyfenozide technical grade, 6.12% 98% deltamethrin technical grade, 4% comb-type polycarboxylate, 3% alkylphenol polyoxyethylene ether sulfonate, 2% fatty alcohol polyoxyethylene ether sulfonate, 3% castor oil polyoxyethylene ether, 0.2% silicone defoamer, 4% sorbitol, 0.5% sodium benzoate, and water to 100%.

[0035] Implementation Example 2:

[0036] Indoor combined toxicity assay of deltamethrin, methoxyfenozide and mixed products against spinach and beet armyworm

[0037] 1. Experimental Objective

[0038] By measuring and evaluating the toxicity of methoxyfenozide and deltamethrin, and their different mixtures, to the spinach beet armyworm, the compatibility between the two was clarified, providing a scientific basis for the research and development of mixtures of methoxyfenozide and deltamethrin.

[0039] 2 Experimental Design

[0040] 2.1 Test agents: methoxyfenozide (98% technical grade); deltamethrin (98% technical grade).

[0041] 2.2 Reagent Preparation

[0042] Weigh 0.0307g of 98% technical grade methoxyfenozide, dissolve it in 2mL of LDM, add 0.6mL of Tween80 emulsifier, stir well, add water to 300mL to prepare a 100mg / L stock solution. Then take 100mL of the stock solution and dilute it twice with water containing 0.1% Tween80 emulsifier to prepare 50, 25, 12.5, 6.25 and 3.125mg / L, for a total of 6 concentrations, for testing.

[0043] Weigh 0.0204 g of 98% deltamethrin technical grade, dissolve it in 1 mL of LDM, add 0.4 mL of Tween 80 emulsifier, stir well, add water to 200 mL to prepare a 100 mg / L stock solution. Then take 20 mL of the stock solution and add it to 80 mL of water containing 0.1% Tween 80 emulsifier to prepare a 20 mg / L test solution. Then dilute it with water containing 0.1% Tween 80 emulsifier at a ratio of 2 to prepare 10, 5, 2.5, 1.25 and 0.625 mg / L, for a total of 6 concentrations, for testing.

[0044] Based on the ratios of methoxyfenozide to deltamethrin of 27:3, 19:3, 11:3, 1:1, and 3:19, 36, 34.54, 31.43, 20, and 5.46 mL of methoxyfenozide stock solution were measured, and 4, 5.46, 8.57, 20, and 34.54 mL of deltamethrin stock solution were measured accordingly. The two were mixed, and water with emulsifier was added to make up to 100 mL, and each was prepared into a 40 mg / L test solution. Then, each solution was diluted with water containing 0.1% Tween 80 emulsifier at a ratio of 2 to make 6 concentrations for testing.

[0045] Add 98 mL of water containing 0.1% Tween 80 emulsifier to a beaker containing 2 mL of DMF as a blank control.

[0046] 3. Test Methods

[0047] Referring to NY / T1154.14-2008, the leaf-dip method was adopted. Spinach leaves were punched into leaf discs using a 1.8cm diameter punch. The leaf discs were immersed in the test solution for 15 seconds and then placed in petri dishes (9cm in diameter) lined with moisturizing filter paper. Eight leaf discs were placed in each dish. After air drying, 3rd instar larvae of spinach beet armyworm that had been starved for 4 hours were selected and added to the petri dishes, with no less than 10 larvae per dish. The process was repeated 4 times. After treatment, the dishes were covered and placed in an observation room for cultivation.

[0048] 4. Data Survey and Statistical Analysis

[0049] 4.1 Survey Time and Methods

[0050] After 72 hours, check and record the mortality of the test insects. The criterion for judging the mortality of the test insects is that there is no reaction when the test insects are gently touched with tweezers.

[0051] 4.2 Evaluation Methods for Enhanced Efficiency

[0052] Refer to the standard bioassay method NY / T 1154.7-2006, and use the co-toxicity coefficient method (CTC) of Sun & Johnson (1960) to calculate the co-toxicity coefficient (CTC) of each mixed combination. That is, CTC ≤ 80 indicates antagonistic effect, 80 < CTC < 120 indicates additive effect, and CTC ≥ 120 indicates synergistic effect. The formula for calculating the co-toxicity coefficient is as follows:

[0053]

[0054] The theoretical toxicity index (TTI) of the mixture = the toxicity index of pesticide A × the percentage (%) of pesticide A in the mixture + the toxicity index of pesticide B × the percentage (%) of pesticide B in the mixture

[0055]

[0056] 5 Experimental results

[0057] Table 1 Toxicity determination results of different ratios of deltamethrin and methoxyfenozide against Spodoptera exigua on spinach

[0058]

[0059] As can be seen from Table 1, the indoor bioassay results of this time show that the mixtures of methoxyfenozide and deltamethrin at the ratios of 27:3, 19:3, 11:3 and 1:1 show synergistic effects against Spodoptera exigua on spinach. Their LC50 values are 9.59, 7.97, 7.52, 5.10 mg / L respectively, and the co-toxicity coefficients are 134.19, 147.92, 132.89, 125.71 respectively. Among them, the synergistic effect of 19:3 is the most significant. When the ratio of methoxyfenozide to deltamethrin is 3:19, it shows additive effect.

[0060] Application Example 3: Field efficacy test of Example 1 against Spodoptera exigua on spinach

[0061] 1 Test purpose

[0062] Verify the control effect of the 22% methoxyfenozide·deltamethrin suspension concentrate developed by the applicant against Spodoptera exigua on spinach and its safety to spinach, clarify the field application dosage and application technology, and provide a scientific basis for pesticide registration.

[0063] 2 Test basis

[0064] Agricultural industry standard of the People's Republic of China "Quality Management Specification for Field Efficacy Trials of Pesticide Registration" (NY / T 2885-2016); "Guidelines for Field Efficacy Trials of Pesticides (Part 1)" (GB / T 17980.13-2000).

[0065] 3 Experimental location

[0066] This experiment was conducted at the Guangxi Academy of Agricultural Sciences' research base.

[0067] 4. Selection of test subjects, crops and varieties

[0068] Test subject: Beet armyworm (Spodoptera exigua); Test crop: Spinach.

[0069] 5. Experimental Design and Arrangement

[0070] 5.1 Dosage and Numbering of Pharmaceuticals

[0071] Table 2 Experimental Design of Test Reagents

[0072]

[0073] 5.2 Application time and frequency

[0074] This experiment involved only one application of the drug, which took place on June 4, 2020.

[0075] 5.3 Usage Capacity

[0076] Water consumption: 50L / mu.

[0077] 5.4 Survey Time and Frequency

[0078] The investigation was conducted three times: before medication and on days 3 and 7 after medication.

[0079] 5.5 Method for Calculating Drug Efficacy

[0080]

[0081]

[0082] 6 Experimental Results

[0083] Table 3 Results of field efficacy trial for controlling spinach and beet armyworm in Example 1

[0084]

[0085] Table 3 shows that, 3 days after application, the control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin SC with active ingredients of 16.5, 33, and 49.5 g / ha against the spinach beet armyworm was 84.45%, 86.65%, and 89.21%, respectively. The control efficacy of the control pesticides 240 g / L methoxyfenozide SC (72 g / ha) and 25 g / L deltamethrin EC (15 g / ha) was 84.13% and 82.97%, respectively. Analysis using the Duncan multiple range test showed that the control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin SC with active ingredient of 16.5 g / ha was comparable to that of the two control pesticides 240 g / L methoxyfenozide SC (72 g / ha) and 25 g / L deltamethrin EC (15 g / ha), with no significant difference. The control efficacy of the test agent 22% methoxyfenozide·deltamethrin SC with an active ingredient of 33 g / ha was comparable to that of the control agent 240 g / L methoxyfenozide SC with 72 g / ha, with no significant difference; however, it was significantly higher than that of the control agent 25 g / L deltamethrin EC with 15 g / ha. The control efficacy of the test agent 22% methoxyfenozide·deltamethrin SC with an active ingredient of 49.5 g / ha was extremely significantly higher than that of the two control agents, 240 g / L methoxyfenozide SC with 72 g / ha and 25 g / L deltamethrin EC with 15 g / ha.

[0086] Seven days after application, the control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin SC with active ingredients of 16.5, 33, and 49.5 g / ha against the spinach beet armyworm was 86.72%, 89.70%, and 92.24%, respectively. The control efficacy of the control pesticides 240 g / L methoxyfenozide SC (72 g / ha) and 25 g / L deltamethrin EC (15 g / ha) was 86.96% and 84.15%, respectively. Analysis using the Duncan multiple range test showed that the control efficacy of the experimental pesticides 22% methoxyfenozide·deltamethrin SC (16.5 and 33 g / ha) was comparable to that of the two control pesticides 240 g / L methoxyfenozide SC (72 g / ha) and 25 g / L deltamethrin EC (15 g / ha), with no significant difference. The control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin SC (49.5 g / ha of active ingredient) was significantly higher than that of the control pesticide 240 g / L methoxyfenozide SC (72 g / ha). It was also significantly higher than that of 25 g / L deltamethrin EC (15 g / ha).

[0087] Application Example 4: Field Efficacy Trial for Controlling Spinach Beetroot Moth (Example 2)

[0088] The experimental objectives, experimental basis, drug design and dosage, and efficacy calculation methods are the same as in Application Example 3.

[0089] 1. Experimental Location

[0090] This experiment was conducted in Meichuan Town, Wuxue City, Hubei Province.

[0091] 2. Selection of test subjects, crops and varieties

[0092] Test subject: beet armyworm (Spodoptera exigua Hübner); Test crop: spinach, variety Jianbo, which is growing well.

[0093] 3. Application time and frequency

[0094] On October 8, 2020, the medicine was applied once.

[0095] 4 Usage Capacity

[0096] Water consumption for the experiment: 675 liters per hectare.

[0097] 5. Survey time and number of times

[0098] The baseline population was surveyed before medication (October 8, 2020), and the efficacy was assessed 2 days (October 10, 2020) and 7 days (October 15, 2020) after medication.

[0099] 6 Experimental Results

[0100] Table 4. Results of field efficacy trial for controlling spinach and beet armyworm in Example 2.

[0101]

[0102] Note: Lowercase letters indicate differences between treatments at the 0.05 level, and uppercase letters indicate differences between treatments at the 0.01 level.

[0103] As shown in Table 4, the 22% methoxyfenozide·deltamethrin suspension concentrate in Example 2 exhibited good rapid efficacy against the beet armyworm. Two days after application, the beet armyworm population reduction rate under treatments of 5 g / 667 m², 10 g / 667 m², and 15 g / 667 m² of the 22% methoxyfenozide·deltamethrin suspension concentrate ranged from 89.3% to 97.3%, with control efficacy ranging from 86.1% to 96.5%. The control efficacy of 20 g / 667 m² of the 240 g / L methoxyfenozide suspension concentrate and 40 g / 667 m² of the 25 g / L deltamethrin emulsifiable concentrate against the beet armyworm was 91.5% and 89.1%, respectively, both lower than the control efficacy of the 10 g / 667 m² treatment.

[0104] Seven days after application, the control efficacy of each dose of the test substance against beet armyworm was improved compared to two days after application, ranging from 95.8% to 100%. The control efficacy of 20 g / 667 m² of 240 g / L methoxyfenozide suspension and 40 g / 667 m² of 25 g / L deltamethrin emulsifiable concentrate against beet armyworm was 95.8% and 92.9%, respectively. No adverse effects were observed on the target crop within the tested dosage range.

[0105] Application Example 5: Field Efficacy Trial for Controlling Spinach Beetroot Moth (Example 3)

[0106] The experimental objectives, experimental basis, drug design and dosage, and efficacy calculation methods are the same as in Application Example 3.

[0107] 1. Experimental Location

[0108] This experiment was conducted in Yangling District, Shaanxi Province.

[0109] 2. Selection of test subjects, crops and varieties

[0110] Test subject: Beet armyworm (Spodoptera exigua (Hübner)); Test crop: Huabo No. 1, which grew well.

[0111] 3. Application time and frequency

[0112] The experiment was conducted during the early larval stage of the spinach beet armyworm, with one application of pesticide on June 10th.

[0113] 4 Usage Capacity

[0114] The amount of pesticide solution sprayed per mu is 50 liters, and the amount of pesticide solution sprayed per hectare is 750 liters.

[0115] 5. Survey time and number of times

[0116] Before applying the pesticide, the initial insect population was investigated. After applying the pesticide, the insect population was investigated at 1 day, 3 days, and 7 days after application.

[0117] 6 Experimental Results

[0118] Table 5. Results of field efficacy trial for controlling spinach and beet armyworm in Example 3.

[0119]

[0120] As shown in Table 5, the control efficacy of the five treatments in Example 3 (22% methoxyfenozide·deltamethrin suspension at 16.5, 33, and 49.5 g(ai) / ha) and the control agents (240 g / L methoxyfenozide suspension at 72 g(ai) / ha and 25 g / L deltamethrin emulsifiable concentrate at 15 g(ai) / ha) after application was 83.57%, 86.44%, 88.51%, 60.74%, and 86.03%, respectively); the control efficacy after 3 days was 86.46%, 90.57%, 92.78%, 90.66%, and 92.28%, respectively; and the control efficacy after 7 days was 93.81%, 97.88%, 98.88%, 93.89%, and 95.18%, respectively.

[0121] Analysis of variance showed that, 1 day after application, the control efficacy of the five treatments—22% methoxyfenozide·deltamethrin suspension at 16.5, 33, and 49.5 g(ai) / ha, and the control treatments—240 g / L methoxyfenozide suspension at 72 g(ai) / ha and 25 g / L deltamethrin emulsifiable concentrate at 15 g(ai) / ha—did not differ significantly at the 0.05 and 0.01 levels. At 7 days after application, the control efficacy of each treatment did not differ significantly at the 0.05 level.

[0122] Application Example 6: Field Efficacy Trial for Controlling Spinach Beetroot Moth (Example 4)

[0123] The experimental objectives, experimental basis, drug design and dosage, and efficacy calculation methods are the same as in Application Example 3.

[0124] 1. Experimental Location

[0125] This experiment was conducted in Meichuan Town, Wuxue City, Hubei Province.

[0126] 2. Selection of test subjects, crops and varieties

[0127] The test subject was the beet armyworm (Spodoptera exigua Hübner), which was being tested during the early larval stage of the spinach beet armyworm. The test crop was a variety called Jianbo, which was growing well.

[0128] 3. Application time and frequency

[0129] The medication was applied once on November 3, 2019.

[0130] 4 Usage Capacity

[0131] The amount of pesticide solution sprayed per mu is 50 liters, and the amount of pesticide solution sprayed per hectare is 750 liters.

[0132] 5. Survey time and number of times

[0133] The baseline survey was conducted as required by the agreement: before application of the pesticide; second survey: 2 days after application of the pesticide; third survey: 7 days after application of the pesticide.

[0134] 6 Experimental Results

[0135] Table 6. Results of field efficacy trial for controlling spinach and beet armyworm in Example 4.

[0136]

[0137] As shown in Table 6, the 22% methoxyfenozide·deltamethrin suspension concentrate of Example 4 exhibited good rapid efficacy against the spinach beet armyworm. Two days after application, the control efficacy of the experimental agents at 5 g / 667 m², 10 g / 667 m², and 15 g / 667 m² ranged from 86.73% to 93.47% against the spinach beet armyworm. The control efficacy of the 240 g / L methoxyfenozide suspension concentrate at 20 g / 667 m² and the 25 g / L deltamethrin emulsifiable concentrate at 40 g / 667 m² against the spinach beet armyworm were 81.27% and 80.67%, respectively.

[0138] The experimental pesticide 22% methoxyfenozide·deltamethrin suspension showed excellent control efficacy against beet armyworm in spinach. Seven days after application, the control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin suspension against beet armyworm in all treatments reached over 92.41%.

[0139] Analysis using Duncan's new multiple range method showed that, 7 days after application, there was a significant difference in the control efficacy of the experimental pesticide 22% methoxyfenozide·deltamethrin suspension at 5 g / 667 m² and 15 g / 667 m² against the spinach beet armyworm. Furthermore, there were significant differences in the control efficacy of the experimental pesticide at 10 g / 667 m² compared to the control pesticides 240 g / L methoxyfenozide suspension at 20 g / 667 m² and 25 g / L deltamethrin emulsifiable concentrate at 40 g / 667 m², indicating that the experimental pesticide was more effective.

Claims

1. An insecticidal composition containing methoxyfenozide, characterized in that: The composition consists of methoxyfenozide, deltamethrin, adjuvants and excipients, and is prepared as a suspension, wherein the weight ratio of methoxyfenozide to deltamethrin is 9:1 to 1:

1.

2. The insecticidal composition according to claim 1, characterized in that: The weight ratio of methoxyfenozide to deltamethrin is 19:

3.

3. The insecticidal composition according to claim 1 or 2, characterized in that: The total content of methoxyfenozide and deltamethrin in the insecticidal composition is 11% to 44%.

4. The insecticidal composition according to claim 3, characterized in that: The total content of methoxyfenozide and deltamethrin in the insecticidal composition is 22%.

5. The insecticidal composition according to claim 1, characterized in that: The additives and excipients mentioned are selected from one or more of dispersants, wetting agents, antifreeze agents, preservatives, defoamers, pH adjusters, thickeners, and water.

6. The insecticidal composition according to claim 1, characterized in that: The effective ingredient dosage of the insecticidal composition is 16.5~49.5 g / ha.

7. The use of the insecticidal composition according to claim 1, characterized in that: The insecticidal composition is used for the control of beet armyworm.

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