Insecticidal composition for preventing and controlling papaya red spider

Abstract

The present invention belongs to the technical field of pesticides, and specifically relates to an insecticidal composition for preventing and controlling papaya red spiders. An insecticidal composition, the insecticidal composition is used to prevent and control papaya red spiders, and the insecticidal composition is compounded by ethazofop-butyl and pyrimidine or thymol; the mass ratio of the ethazofop-butyl and pyrimidine is 1-9:9-1; the mass ratio of the ethazofop-butyl and thymol is 1-30:20-1. The compounding of the ethazofop-butyl and pyrimidine or thymol of the present invention can improve the control effect on papaya red spiders, reduce the application amount of the agent, help improve the risk of drug resistance and the problem of pesticide residues, and at the same time can prolong the service life of the agent, which can provide support for solving the problems existing in the chemical control of harmful mites.

Description

Technical Field

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

[0002] The banana red spider mite, Tetranychus Piercei McGregor, belongs to the class Arachnida, the subclass Acari, the order True Acarina, the superfamily Tetranychus, and the genus Tetranychus. It is distributed in all regions of my country and is one of the main pests of melon and fruit vegetables, tea, bananas, and papayas. The red spider that harms papayas is the banana red spider mite, Tetranychus Piercei McGregor. Tetranychus Piercei McGregor harms the leaves, tender stems, flowers, and fruits of papayas. The affected leaves are chlorotic and have yellow spots. In severe cases, they become patches. When the leaves are not full of yellow spots, they become mosaics, causing the leaves to age and fall off prematurely.

[0003] Chemical control is the most common, rapid and effective method for the control of mites. In the process of chemical control of mites, due to the irrational use of chemical agents, the resistance of mites has increased, and mites have become rampant, resulting in excessive use of chemical pesticides, excessive pesticide residues, and shortened service life of agents. Compounding and screening different insecticide activities can not only develop miticides with excellent control effects, but also find reasonable methods to extend the service life of existing miticides. It is an important way to solve the problems in chemical control of mites.

[0004] Ethiophanate-methyl is an acrylonitrile acaricide, which kills harmful mites by contact and stomach poisoning. Ethiophanate-methyl is metabolized into hydroxy compounds in the mite body, inhibiting the action of succinate dehydrogenase in the mite body, thereby affecting complex II in the respiratory electron transport chain of the mite, and finally destroying the energy synthesis process of the mite, thereby achieving a mite-killing effect. This mechanism of action makes ethiophanate-methyl highly active against all growth stages of mites (including eggs, young mites, nymphs and adult mites). In addition, ethiophanate-methyl is good for the environment, has low toxicity to bees, birds, fish and silkworms, and has minimal effect on predatory mites.

[0005] At present, there are no reports on the combination of ethidium bromide with pyraclostrobin or thymol. Summary of the invention

[0006] The purpose of the present invention is to provide an insecticide composition for controlling papaya red spider, so as to solve the problems caused by the unreasonable use of chemical agents.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A pesticidal composition, which is used for preventing and controlling papaya red spider mites, and is compounded by ethamicloprid and pentamethylenediamine or thymol; wherein the mass ratio of the ethamicloprid to pentamethylenediamine is 1-9:9-1; and the mass ratio of the ethamicloprid to thymol is 1-30:20-1.

[0009] The present invention also provides an insecticide, which is prepared by using the insecticide composition as an active ingredient and supplemented with auxiliary ingredients allowed to be added in pesticide science.

[0010] More specifically, the mass of the insecticide composition accounts for 0.35-85% of the total mass of the insecticide.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The toxicity LC of the single dose of ethazolin, pyraclostrobin and thymol to papaya red spider 50 They are 1.664 mg / L, 8.316 mg / L and 127.358 mg / L respectively. When compounding, when ethazofenyl is compounded with pyrimidine, within the mass ratio range of 1-9:9-1, the effective inhibition concentration of Pi's spider mite is within 121.308-196.964, and the co-toxicity coefficient is greater than 120, showing a synergistic effect; when ethazofenyl is compounded with thymol, within the mass ratio range of 1-30:20-1, the effective inhibition concentration of Pi's spider mite is within 122.115-229.443, and the co-toxicity coefficient is greater than 120, showing a synergistic effect. It is explained that the compounding of ethazofenyl with pyrimidine or thymol of the present invention can improve the control effect on papaya red spider mites, reduce the application amount of the agent, help to improve the risk of drug resistance and pesticide residues, and at the same time can prolong the service life of the agent, which can provide support for solving the problems existing in the chemical control of harmful mites. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the technical solution of the patent of this invention.

[0014] Example :Indoor test of compounding of ethazolin

[0015] 1. Test subjects

[0016] The Pieris tetranychii mites were collected from papaya plants and fed with fresh papaya leaves in the laboratory for 6 generations. Then, healthy and energetic female adult mites of uniform size were selected as test subjects.

[0017] 2. Test reagents

[0018] 98% Ethiophanate-methyl TC, 96% Penicillin TC, 99% Thymol TC

[0019] After the original drug is dissolved, it is diluted with 0.1% Tween-80 aqueous solution to form a single-dose stock solution, and multiple groups of proportions are set. Each single dose and each group of mixed proportions are set with 5 mass concentration gradients according to the equal ratio method.

[0020] 3. Test method (refer to "NT / T 1154.13-2008 Pesticide Indoor Test Guidelines Insecticides Part 13: Leaf Disk Spray Method")

[0021] Select papaya leaves with uniform growth and cut leaf discs with a diameter of 2 cm. Place a wet sponge in a 9 cm diameter petri dish, place filter paper on it, and place leaf discs on the filter paper. There are 2 leaf discs in each dish. Inoculate the test mites on the leaf discs, with 20 mites inoculated on each leaf disc. Place the petri dish in a Potter spray tower (spray pressure 1.47×10 5 The fish were sprayed on a plate with a spray volume of 1 mL. The liquid was taken out after sinking for 1 minute and then transferred to a temperature of (25±1)°C and a photoperiod of 16L / 8D. Each treatment was repeated 4 times, and a treatment containing only 0.1% Tween-80 aqueous solution was used as a blank control.

[0022] After 48 hours of treatment, the mortality of harmful mites was checked with a binocular dissecting microscope. Mites that showed no reaction when gently touched with a soft brush tip were considered dead. The adjusted mortality rate of each treatment was calculated.

[0023]

[0024] In the above formula: P--mortality rate, unit is %; K--number of dead insects; N--total number of insects treated.

[0025]

[0026] In the above formula: P 1 --Adjusted mortality rate, in %; P t --Treatment mortality rate, in %; P 0 --Blank control mortality rate, in %.

[0027] 4. Data Analysis

[0028] The toxicity regression equation and LC of each pesticide were calculated based on the probability value of the corrected mortality of pest mites and the logarithmic value of the pesticide concentration. 50 The co-toxicity coefficient (CTC value) of the mixture was calculated according to the Sun Yunpei method.

[0029] 5. Efficacy evaluation

[0030] The synergistic effect of the drug was evaluated based on the calculated co-toxicity coefficient (CTC). CTC≤80 was antagonistic, 80<CTC<120 was additive, and CTC≥120 was synergistic. The results are shown in Table 1-2.

[0031] Table 1 The results of toxicity test of ethidium bromide and pyraclostrobin against Tetranychus pilosula

[0032] Drug name and ratio <![CDATA[LC 50 (mg / L)]]> ATI TTI CTC Ethiophanate-methyl 1.664 100.000 -- -- Pentometabolic acid 8.316 20.010 -- -- Ethiophanate-methyl 1: Pentoguanil 9 4.747 35.054 28.009 125.153 Ethiophanate-methyl 1: Pentoguanidine 3 3.058 54.415 40.007 136.012 Ethiophanate-methyl 1: Pentomethalin 1 2.286 72.791 60.005 121.308 Ethiocarb 3: Pentoguanil 1 1.056 157.576 80.002 196.964 Ethiophanate-methyl 9: Pentoguanil 1 1.403 118.603 92.001 128.915

[0033] As shown in Table 1, the toxicity LC values ​​of ethamifenibacill and pyraclostrobin to Tetranychus pilosula 50 The values ​​were 1.664mg / L and 8.316mg / L respectively. When ethazolin and pyraclostrobin were compounded, within the mass ratio range of 1-9:9-1, the effective inhibition concentration of the Pittschermachium mites was within 121.308-196.964, and the co-toxicity coefficient was greater than 120, showing a synergistic effect.

[0034] Table 2 The results of toxicity test of ethazolin and thymol against Tetranychus pilosula

[0035] Drug name and ratio <![CDATA[LC 50 (mg / L)]]> ATI TTI CTC Ethiophanate-methyl 1.664 100.000 -- -- Thymol 127.358 1.307 -- -- Ethiophanate-methyl 1: thymol 20 21.215 7.844 6.006 130.589 Ethiophanate-methyl 1: thymol 10 13.257 12.552 10.279 122.115 Ethiophanate-methyl 1: thymol 5 6.192 26.873 17.755 151.353 Ethiophanate-methyl 1: thymol 1 2.631 63.246 50.653 124.860 Ethiophanate-5:thymol-1 1.128 147.518 83.551 176.560 Ethiophanate-methyl 10: thymol 1 1.412 117.847 91.028 129.463 Ethiophanate-methyl 20: thymol 1 0.761 218.660 95.300 229.443 Ethiophanate-30:Thymol-1 0.937 177.588 96.816 183.428

[0036] As shown in Table 2, the toxicity LC values ​​of ethamifen and thymol against Tetranychus pilosa 50 The values ​​were 1.664mg / L and 127.358mg / L respectively. When ethazolin and thymol were compounded, within the mass ratio range of 1-30:20-1, the effective inhibition concentration of the Pittschermachium mites was within 122.115-229.443, and the co-toxicity coefficient was greater than 120, showing a synergistic effect.

[0037] In summary, the compounding of the ethidium aconitum of the present invention with pyraclostrobin or thymol can improve the control effect on papaya red spider mites, reduce the application amount of the agent, help improve the risk of drug resistance and the problem of pesticide residues, and at the same time extend the service life of the agent, which can provide support for solving the problems existing in the chemical control of harmful mites.

Claims

1. An insecticidal composition for controlling papaya red spider mites, characterized in that: The insecticide composition is prepared by compounding ethidium bromide with pyraclostrobin or thymol; wherein: The mass ratio of ethazolin to pyraclostrobin is 1-9:9-1; The mass ratio of the ethidium aconitum to thymol is 1-30:20-1.

2. An insecticide, characterized in that: The insecticide is prepared by using the insecticide composition according to claim 1 as an active ingredient and supplemented with auxiliary ingredients allowed to be added in pesticide science.

3. The insecticide according to claim 2, characterized in that The mass of the insecticide composition accounts for 0.35-85% of the total mass of the insecticide.

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