Issue:ISSN 2095-1353
CN 11-6020/Q
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2012年49 No.6
Toxicity of various classes of insecticides to Serangium japonicum，a predator of Bemisia tabaci
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Key Words： insecticides，Serangium japonicum，toxicity
Abstract： The toxicity of various classes of insecticides to Serangium japonicum Chapin was tested by contact with dry residues on glass tubes． Both methomyl and dichlorovos were highly toxic to S． japonicum with only 25% of the recommended field dose could cause 100% mortality． Chlorantraniliprole，imidacloprid and thiamethoxam caused 100% mortality at the recommended doses and 73. 33% － 100. 00% mortality at 50. 06% of the recommended doses． The recommended doses of dimethoate，nitenpyram，and diafenthiuron caused 40. 00% ，56. 67% and 50. 00% mortality， respectively． Thus，application of any of these insecticides can cause significant mortality in S． japonicum in the field． The othertestedinsecticides，beta-cypermethrin，bifenthrin，fenpropathrin，beta-cyfluthrin，chlorpyrifos，chlorfenapyr，avermectin，pymetrozine，buprofezin，chlorfluazuron and flufenoxuron，showed relatively low toxicity，or were even not fatal to，S． japonicum． These results provide the basis for future guidelines for rational insecticide use，and also help the development of effective IPM programs involving both natural enemies and insecticides for the control of B． tabaci in China．