An insecticidal composition for controlling thrips palmi

Abstract

The present application belongs to the technical field of thrips control, and particularly relates to a kind of insecticidal composition for controlling papaya thrips. The active ingredient of the insecticidal composition for controlling papaya thrips is compounded by wintergreen oil and spirotetramat, or compounded by wintergreen oil and spirodichlofenidin. The mass ratio of the wintergreen oil and the spirotetramat is 1-4:20-1, and the mass ratio of the wintergreen oil and the spirodichlofenidin is 1-30:10-1. The components of the present application are reasonable, and the activity after compounding is not a simple superposition of the activity of each component, but has a significant synergistic effect. Compared with a single agent, the insecticidal effect can be improved, and the problems existing in the use of a single component insecticide for controlling papaya thrips can be effectively solved, which has important significance for the development of new insecticides for controlling papaya thrips.

Description

Technical Field

[0001] The invention belongs to the technical field of thrips prevention and control, and particularly relates to an insecticide composition for preventing and controlling papaya thrips. Background Art

[0002] Thrips, belonging to the order Thysanoptera, family Thripidae, are a worldwide pest and an important quarantine target. They are small, stealthy, and reproduce rapidly, primarily using their rasp-sucking mouthparts to suck sap from tender tissues of host plants and lay eggs. The western flower thrips, Frankliniella occidentalis (Pergande), is a pest of papaya, primarily targeting flowers and young fruits. Symptoms are subtle, but as the fruit grows and develops, the affected areas develop a regular, slightly concave, mossy pattern with rust-brown or silver-brown scars. Mature fruit also develops black scars, severely affecting its appearance and quality.

[0003] Insecticides, such as avermectin, spirotetramat, spinetoram, flupyralid, ethiprole, and cyclohexaprid, are the primary means of controlling thrips on papaya. In recent years, unscientific use of insecticides, such as long-term, high-dose use of single-ingredient insecticides, has led to the development of resistance in target pests, resulting in a gradual decline in the effectiveness of existing chemical agents. While increasing the insecticide dosage can improve pest control, it can also exacerbate the development of resistance and pose problems with pesticide residues and environmental pollution. Therefore, the development of new insecticides for the control of papaya thrips is of great significance.

[0004] The information disclosed in this background technology section is only intended to enhance understanding of the overall background of the invention and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the Invention

[0005] The object of the present invention is to provide an insecticide composition for controlling papaya thrips, so as to solve the problems existing in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] Disclosed is an insecticide composition for controlling papaya thrips. The active ingredients of the insecticide composition are prepared by compounding wintergreen oil and spirotetramat, or by compounding wintergreen oil and pentamethylenetetramat. The mass ratio of the wintergreen oil to spirotetramat is 1-4:20-1; and the mass ratio of the wintergreen oil to pentamethylenetetramat is 1-30:10-1.

[0008] Preferably, the wintergreen oil is purchased from Jiangxi Jingwang Natural Flavor Co., Ltd., and its methyl salicylate content is 99%.

[0009] As preferred, the mass ratio of the wintergreen oil to spirotetramat is 4:1.

[0010] As preferred, the mass ratio of the wintergreen oil to pentachloropiridyl guanidine is 1:7.

[0011] An insecticide comprising the insecticidal composition, in which the mass of the active ingredient accounts for 0.25-65% of the total mass of the insecticide, and the rest is auxiliary ingredients.

[0012] Compared with the prior art, the present application has the following beneficial effects:

[0013] The components of the present application are reasonable, and the activity after compounding is not a simple superposition of the activity of each component, but has a significant synergistic effect. Compared with a single agent, the present application can improve the insecticidal effect and effectively solve the problems existing in the use of a single component insecticide to control papaya thrips, and has important significance for developing new insecticides for controlling papaya thrips. DETAILED DESCRIPTION

[0014] The following clearly and completely describes the technical solutions of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0015] Examples : Indoor biological activity test

[0016] 1. Test agent

[0017] Wintergreen oil (methyl salicylate content 99%, Jiangxi Jingwang Natural Fragrance Co., Ltd.), 97% spirotetramat technical material (Hebei Weiyuan Biological Chemical Co., Ltd.), 96% pentachloropiridyl guanidine technical material (Hefei Xingyu Chemical Co., Ltd.)

[0018] 2. Test pests

[0019] The western flower thrips collected from papaya plantations were continuously bred in the laboratory for 12 generations, and the western flower thrips hatched for 2 days were selected as the test objects.

[0020] Rearing conditions: temperature 25℃, photoperiod 16L:8D, relative humidity 65±5%.

[0021] 3. Test method: (reference to NY / T 1154.6-2013 Pesticide Indoor Biological Test Guidelines)

[0022] The test agent was dissolved with solvent, and then 0.1% Tween-80 aqueous solution was added to prepare a single agent stock solution with a concentration of 10,000 mg / L. Then multiple groups of mixtures were prepared, and each single agent stock solution and each group of mixture was diluted with 0.1% Tween-80 aqueous solution to 5 mass concentration gradients, 50 mL of each mass concentration of liquid medicine. The above medicines were prepared immediately before use.

[0023] The culture dish with a diameter of 9 cm was soaked with the liquid medicine for 1 h, and then taken out and naturally dried. Fresh and clean green bean pods (pod length 5 cm, planted in the laboratory and not exposed to any medicine) were soaked with the liquid medicine for 30 s, then taken out and naturally dried, and then placed in the culture dish treated with the same liquid medicine, 1 pod per dish. 20 test pests were introduced into each culture dish, the culture dish was sealed with plastic wrap, and multiple air holes were punched on the plastic wrap with an insect needle to ensure air circulation, and then transferred to the original feeding condition for continuous feeding. Each mass concentration of liquid medicine was repeated 4 times, and a treatment containing only 0.1% Tween-80 aqueous solution was used as a blank control. After 48 h of treatment, the mortality of test insects was investigated, and the total number of insects and the number of dead insects in each treatment were recorded. The corrected mortality of each treatment was calculated, and the logarithmic values of the concentrations of each treatment and the corrected mortality probability values were subjected to regression analysis to calculate the LC 50 of each treatment. The co-toxicity coefficient (CTC value) of the mixture was calculated according to the method of Sun Yunpei.

[0024] P1 = (K ÷ N) × 100, wherein P1: mortality rate; K: number of dead insects; N: total number of insects in the treatment;

[0025] P2 = [(P t -P0) ÷ (1-P0)] × 100, wherein P2: corrected mortality rate; P t : treatment mortality rate; P0: blank control mortality rate;

[0026] Actual toxicity index (ATI) = (standard agent EC 50 ÷ test agent EC 50 ) × 100;

[0027] Theoretical toxicity index (TTI) = toxicity index of agent A × percentage of agent A in the mixture + toxicity index of agent B × percentage of agent B in the mixture;

[0028] Co-toxicity coefficient (CTC) = [actual toxicity index (ATI) of the mixture ÷ theoretical toxicity index (TTI) of the mixture] × 100.

[0029] According to the joint action classification standard: co-toxicity coefficient (CTC) ≥ 120, showing synergistic effect; co-toxicity coefficient (CTC) ≤ 80, showing antagonistic effect; 80 < co-toxicity coefficient (CTC) < 120, showing additive effect. The experimental results are shown in Tables 1-2.

[0030] Table 1 indoor bioactivity determination of wintergreen oil and spirotetramat complex on western flower thrips

[0031] Medicament name and ratio LC 50 (mg / L) ATI TTI CTC Wintergreen oil 13.76 100.00 -- -- spirotetramat 32.49 42.35 -- -- Wintergreen oil 1: spirotetramat 20 16.19 84.99 45.10 188.46 Wintergreen oil 1: spirotetramat 10 19.31 71.26 47.59 149.73 Wintergreen oil 1: spirotetramat 8 22.88 60.14 48.76 123.35 Wintergreen oil 1: spirotetramat 4 14.20 96.90 53.88 179.84 Wintergreen oil 1: spirotetramat 2 11.34 121.34 61.57 197.08 Wintergreen oil 1: spirotetramat 1 13.95 98.64 71.18 138.58 Wintergreen oil 2: spirotetramat 1 7.66 179.63 80.78 222.36 Wintergreen oil 4: spirotetramat 1 2.17 634.10 88.47 716.74

[0032] As shown in Table 1, the co-toxicity coefficients of wintergreen oil and spirotetramat in the mass ratio range of 1-4:20-1 are all greater than 120, indicating that the bioactivity of wintergreen oil and spirotetramat complex on western flower thrips shows a synergistic effect.

[0033] Table 2 indoor bioactivity determination of wintergreen oil and spirodichlofen complex on western flower thrips

[0034]

[0035]

[0036] As shown in Table 2, the co-toxicity coefficients of wintergreen oil and spirodichlofen in the mass ratio range of 1-30:10-1 are all greater than 120, indicating that the bioactivity of wintergreen oil and spirodichlofen complex on western flower thrips shows a synergistic effect.

[0037] As can be seen from the above, when wintergreen oil and spirotetramat, or wintergreen oil and spirodichlofen are complexed in a certain mass ratio range, the co-toxicity coefficients are all higher than 120, and have a significant synergistic effect, and compared with a single agent, the control effect on papaya thrips can be improved.

[0038] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments with various modifications being suited to the particular use contemplated. The scope of the application is to be defined by the claims and their equivalents.

Claims

1. An insecticidal composition for controlling papaya thrips, characterized in that: The active ingredients of the insecticide composition are prepared by compounding wintergreen oil and spirotetramat, and the mass ratio of the wintergreen oil to spirotetramat is 1-4:20-1.

2. The insecticidal composition according to claim 1, characterized in that The wintergreen oil was purchased from Jiangxi Jingwang Natural Flavor Co., Ltd., and its methyl salicylate content was 99%.

3. The insecticidal composition according to claim 1, characterized in that The mass ratio of the wintergreen oil to spirotetramat is 4:

1.

4. An insecticide comprising the insecticide composition according to any one of claims 1 to 3, characterized in that: In the insecticide, the mass of the active ingredient accounts for 0.25-65% of the total mass of the insecticide, and the rest are auxiliary ingredients.

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