Indoor toxicity test and field efficacy of six insecticides against the larva of Contarinia maculipennis Felt
Objective]Desirable insecticides were studied and screened to provide references for chemical control of C. maculipennis. [Method]Dipping method and field foliar spraying using were employed to test the indoor toxicity and field efficacy of six high-efficient and low-toxic insecticides against larvae of C. maculipennis. [Result]Toxicity deter-mination results showed that LC50 order of the insecticides against the larvae was 5% acetamiprid EC<3% avermectins EW<6% spinetoram SC<4.5% beta cypermethrin EC<10% imidacloprid WP<48% chlorpyrifos EC, and the toxicity in-dex was 5% acetamiprid EC>3% avermectins EW>6% spinetoram SC>4.5% beta cypermethrin EC>10% imidacloprid WP>48% chlorpyrifos EC. The results of field experiment demonstrated that 5% acetamiprid EC exhibited the best con-trol efficiency with 78.52% control efficiency, followed by 6% spinetoram SC and 3% avermectins EW, with 68.09%and 60.99% control efficiency to against C. maculipennis after three days of spraying. After seven days of spraying, the highest control efficiency to C. maculipennis was also observed on 5% acetamiprid EC, with 72.12% control efficiency and it was declined to 60.83% and 50.88% when 6% spinetoram SC and 3% avermectins EW were used. [Conclusion]Acetamiprid should be firstly selected and used in interval rotation with chlorpyrifos and spinetoram for effective control of C. maculipennis.
国家科技期刊平台
NSTL
万方数据
维普
