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Received:November 14, 2017Revised:December 12, 2017
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Effect Test of Six Insecticides on Bauhinia purpurea
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Abstract:
The toxicity of five insecticides against Aphis gossypii was determined by quantitative and spray method. The results showed that pymetrozine 0.25% WP had the highest toxicity to A. gossypii, with the LC50 value of 2.296 mg/L and the toxicity of thiamethoxam 25% WG to A. gossypii was not satisfied. Field control efficiency of six insecticides against A. gossypii was evaluated. The insecticides such as lambda-cyhalothrin 2.5% SC, pymetrozine 0.25% WP and nocotine · matrine 1.2% EC had better control effects to A. gossypii. In which, control effects of three insecticides to the A. gossypii were 94.58%, 94.09% and 89.16% respectively for seven days after treatment. At the same time, four growth indicators of Bauhinia purpurea after the application of lambda-cyhalothrin 2.5% SC was significantly higher than the untreated seedling, such as seedling height, ground diameter, fresh weight on the ground and dry weight on the ground. The results showed that lambda-cyhalothrin 2.5% SC and pymetrozine 0.25% WP had a preferably good quick and persistent efficacy, and had been applied for pest control. The 1.2% nicotine matrine EC could be used as a alternative insecticide to avoid aphid resistance.
Key words:  Bauhinia purpurea; Aphis gossypii; insecticides; toxicity test;control effect

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