Toxicity and Field Efficacy of Different Insecticides Against Adults of Brassicogethes aeneus Fabricius
In order to screen out highly effective and safe insecticides against Brassicogethes aeneus Fabrici-us in the winter rapeseed area of Shaanxi Province,six insecticides were evaluated through both laboratory toxici-ty tests and field trials.The six insecticides tested were 5%Lambda-cyhalothrin EW,25%Deltamethrin EC,20%Dinotefuran WG,30%Thiamethoxam SC,10%Cyantraniliprole OD and 20%Chlorantraniliprole SC.The toxicity test was conducted using insect dipping method,and the control efficacy of these insecticides was evalua-ted through field plot trials.The toxicity results showed that all the six insecticides exhibited higher toxicity a-gainst Brassicogethes aeneus F.The LC50 values of all treatments were lower than 40mg/L at 24h.Among the tested insecticides,20%Dinotefuran WG exhibited the highest toxicity against Brassicogethes aeneus F.with an LC50 value of 5.236mg/L,followed by 10%Cyantraniliprole OD with an LC50 of 9.650mg/L.The least toxic was 30%Thiamethoxam SC,which had the lowest toxicity with the LC50 value of 35.078mg/L at 24h.The toxicity or-der of six insecticides was as follows:20%Dinotefuran WG>10%Cyantraniliprole OD>25%Deltamethrin EC>20%Chlorantraniliprole SC>5%Lambda-cyhalothrin EW>30%Thiamethoxam SC.The results of field control test showed that the six insecticides were safe and harmless at the test dosage,and had certain control effi-cacy on the Brassicogethes aeneus F.At 1 day,3 days and 7 days after treatment,the control efficacies were 79.3%～91.25%,88.24%～97.95%,72.47%～98.86%,respectively.The 3 000 times of 20%Dinotefuran WG and 4 000 times of 10%Cyantraniliprole OD showed the optimal control efficacies among all the six insecti-cides.The 3000 times of 20%Dinotefuran WG had the best control efficacy among all treatments on the 3rd day,its field control efficacy was 97.95%.The 4000 times of 10%Cyantraniliprole OD had the best control effi-cacy among all treatments on the 7th day,and the field control efficacy was 98.86%.The control efficacies of the two insecticides remained above 85%1～7 days post treatment.The pesticides used to control the Brassicogethes aeneus F.in production should be quick acting,effective and safe for bees based on the comprehensive analysis.20%Dinotefuran WG or 10%Cyantraniliprole OD can be used at rapeseed squaring stage and 20%Chlorantra-niliprole SC can be used at rapeseed flowering stage.
InsecticidesBrassicogethes aeneus FabriciusToxicity assayField control efficacy
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