A pesticide composition for controlling Bactrocera correcta

Abstract

The present invention belongs to the technical field of pesticides, and particularly relates to a pesticide composition for controlling Bactrocera correcta Bezzi. A pesticide composition for controlling Bactrocera correcta Bezzi, wherein the active ingredients are composed of avermectin and imidacloprid or bifenthrin in a compound form. When avermectin is compounded with imidacloprid or bifenthrin in the pesticide composition of the present invention, it shows a synergistic effect on Bactrocera correcta Bezzi, and can improve the control effect on Bactrocera correcta Bezzi.

Description

Technical Field

[0001] The present invention belongs to the technical field of pesticides, and particularly relates to a pesticide composition for controlling Bactrocera cucurbitae in Siraitia grosvenorii fruits. Background Art

[0002] Siraitia grosvenorii is a vine plant of the Cucurbitaceae family. Siraitia grosvenorii is sweet in taste and cool in nature. In addition to its edible value, it also has great medicinal value. During the cultivation process of Siraitia grosvenorii, fruit flies cause harm to it. Fruit flies have become important pests of Siraitia grosvenorii. The fruit flies that harm Siraitia grosvenorii are pests of the family Tephritidae in the order Diptera. There are many kinds of fruit flies that harm Siraitia grosvenorii, such as Bactrocera dorsalis, Bactrocera tau, Bactrocera cucurbitae, and Bactrocera scutellata. These fruit flies not only harm Siraitia grosvenorii, but also harm fruit and vegetable crops such as bitter gourd, sponge gourd, pumpkin, watermelon, wax gourd, and cucumber.

[0003] During the cultivation process of Siraitia grosvenorii, chemical agents can be sprayed to control fruit flies and reduce the harm of fruit flies to Siraitia grosvenorii. And drug resistance is an issue that cannot be ignored in the process of using chemical agents to control pests. Especially for single-component chemical agents, it is easy to cause the generation of pest drug resistance. With the generation and accumulation of pest drug resistance, the control effect of chemical agents on them will gradually decrease. Although increasing the dosage of chemical agents will improve the control effect in a short time, this will exacerbate the accumulation of pest drug resistance, and at the same time, it will also bring problems such as pesticide residues and environmental pollution. With the long-term use of existing agents, Bactrocera cucurbitae in Siraitia grosvenorii fruits has developed varying degrees of drug resistance. Therefore, it is necessary to develop new agents.

[0004] Compound or mix different pesticide varieties is an effective way to develop new agents and control resistant pests and diseases. The inventor found through indoor experiments that when abamectin is compounded with imidacloprid or bifenthrin, it shows a synergistic effect within a certain mass ratio range and can improve the control effect on Bactrocera cucurbitae in Siraitia grosvenorii fruits.

[0005] At present, there are no relevant reports on the compounding of abamectin with imidacloprid or bifenthrin.

[0006] The information disclosed in this background art section is only intended to enhance the overall understanding of the present invention and should not be regarded as an admission or any form of suggestion that this information constitutes prior art already known to those of ordinary skill in the art. Summary of the Invention

[0007] The purpose of the present invention is to provide a pesticide composition for controlling Bactrocera cucurbitae in Siraitia grosvenorii fruits, which can improve the control effect on Bactrocera cucurbitae in Siraitia grosvenorii fruits, can reduce the application dosage of chemical agents, and to a certain extent avoid problems such as pesticide residues and environmental pollution.

[0008] To achieve the above purpose, the present invention provides the following technical solutions:

[0009] A pesticide composition for controlling Bactrocera spp. on Siraitia grosvenorii, the active ingredients of which are composed of avermectin and imidacloprid or bifenthrin in combination.

[0010] Preferably, the mass ratio of avermectin to imidacloprid is 1 - 20:10 - 1.

[0011] Preferably, the mass ratio of avermectin to bifenthrin is 1 - 15:9 - 1.

[0012] Preferably, the mass ratio of avermectin to bifenthrin is 1:3.

[0013] Preferably, the Bactrocera spp. on Siraitia grosvenorii include Bactrocera dorsalis, Bactrocera tau, Bactrocera cucurbitae and Bactrocera scutellata.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) When avermectin is combined with imidacloprid or bifenthrin in the pesticide composition of the present invention, it shows a synergistic effect, can improve the control effect on Bactrocera spp. on Siraitia grosvenorii, can reduce the application dosage of chemical agents, and to a certain extent avoid problems such as pesticide residues and environmental pollution.

[0016] (2) The pesticide composition of the present invention can delay the generation and development of pest resistance and can, to a certain extent, extend the service life of the agent. Specific Embodiments

[0017] The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0018] Embodiment : Indoor Bioactivity Test

[0019] 1. Test Pests

[0020] Collect Bactrocera dorsalis on Siraitia grosvenorii, continuously breed and reproduce it in the laboratory for more than 10 generations, and select adult Bactrocera dorsalis that have emerged for 3 days in the same batch as the test objects.

[0021] Feeding conditions: temperature (25 ± 1) °C, relative humidity about 75%, and photoperiod L:D is (16:5) h.

[0022] 2. Test Agents

[0023] 98% abamectin technical (mass ratio of abamectin A to abamectin B is 8:2), 95% clothianidin technical, 98% bifenthrin technical. All the above agents are commercially available.

[0024] 3. Test method

[0025] Liquid feeding method. The test agents were dissolved and then diluted with 10% sucrose solution (the solvent is 0.1% Tween-80 aqueous solution) to prepare single-agent mother liquor; multiple groups of ratios were set, and each single agent and the mixed agent of each group ratio were further diluted with 10% sucrose solution into 6 gradient mass concentrations for standby.

[0026] Sponges with a size of 2 cm × 2 cm × 2 cm were immersed in the liquid medicine for 30 s and then taken out. When the liquid medicine no longer dripped, the sponges were placed in conical flasks with a volume of 250 mL. 10 test pests (male-female ratio 1:1) that had been starved with clear water for 24 h were introduced into the conical flasks, sealed with medical gauze and placed in an artificial climate chamber. They were continuously reared under the conditions of temperature (25 ± 1) °C, relative humidity about 75%, and photoperiod L:D of (16:5) h. Each concentration was set with 6 replicates. And a treatment with 10% sucrose solution was set as the blank control. The death situation of the test insects was observed 48 h after treatment, and the total number of insects and the number of dead insects in each treatment were recorded respectively, and the corrected mortality of each treatment was calculated therefrom. Among them, the criterion for determining death was that it could not move when gently touched with a writing brush.

[0027]

[0028] In the above formula: P--mortality rate, unit: %; K--number of dead insects; N--total number of insects in the treatment.

[0029]

[0030] In the above formula: P1--corrected mortality rate, unit: %; P t --treatment mortality rate, unit: %; P0--blank control mortality rate, unit: %.

[0031] 4. Data analysis: Use DPS software to conduct regression analysis on the logarithm of the concentration of each treatment agent and the probit value of the corrected mortality of each treatment, calculate the LC 50 of each treatment agent, and calculate the co-toxicity coefficient (CTC value) of the mixed agent according to the Sun Yunpei method.

[0032] 5. Efficacy evaluation

[0033] Evaluate the synergistic effect of the agent according to the calculated co-toxicity coefficient (CTC). When CTC ≤ 80, it is antagonistic effect; when 80 < CTC < 120, it is additive effect; when CTC ≥ 120, it is synergistic effect. The results are shown in Table 1-2.

[0034] Table 1 Toxicity determination results of the combination of abamectin and clothianidin against Bactrocera dorsalis

[0035]

[0036] As can be seen from Table 1, within the mass ratio range of 1 - 20:10 - 1, the co-toxicity coefficient of the combination of abamectin and clothianidin against Bactrocera dorsalis is greater than 120, showing a synergistic effect.

[0037] Table 2 Toxicity determination results of the combination of abamectin and bifenthrin against Bactrocera dorsalis

[0038]

[0039]

[0040] As can be seen from Table 2, within the mass ratio range of 1 - 15:9 - 1, the co-toxicity coefficient of the combination of abamectin and bifenthrin against Bactrocera dorsalis is greater than 120, showing a synergistic effect. Especially when the mass ratio is 1:3, the co-toxicity coefficient reaches 385.895, and the synergistic effect is the most significant.

[0041] In summary, when abamectin is combined with clothianidin or bifenthrin, it shows a synergistic effect within a certain mass ratio range, which can improve the control effect against Bactrocera dorsalis. Based on this, the application dosage of chemical agents can be reduced, and problems such as pesticide residues and environmental pollution caused by large-dose applications can be avoided to a certain extent.

[0042] The foregoing description of specific exemplary embodiments of the invention is for purposes of illustration and exemplification. These descriptions are not intended to limit the invention to the precise forms disclosed, and it is obvious that many changes and variations are possible in light of the above teaching. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the invention and its practical applications, so that those skilled in the art can implement and utilize various different exemplary embodiments of the invention, as well as various different selections and changes. The scope of the invention is intended to be defined by the claims and their equivalents.

Claims

1. A pesticide composition for controlling Bactrocera correcta, characterized in that, Its active ingredient is composed of abamectin and bifenthrin, and the mass ratio of abamectin to bifenthrin is 1-15:9-1.

2. The pesticidal composition for controlling Bactrocera cucurbitae Coquillett according to claim 1, wherein, The mass ratio of abamectin to bifenthrin is 1:

3.

3. The pesticidal composition for controlling Bactrocera correcta described in claim 1, wherein, The said Bactrocera grosvenori includes Bactrocera dorsalis, Bactrocera tau, Bactrocera cucurbitae and Bactrocera scutellata.

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