Laboratory Screening of Alternatives to HighlyToxic Insecticides for Controlling the WhiteBacked Planthopper, Sogatella furcifera and Resistance Risk Assessment to Imidacloprid in Rice
LI Shuyong1,#, LIU Xue 2,#, GAO Congfen1, BO Xianping1, SU Jianya1, WANG Yanhua1, YU Lun1, YAN Xin1, SHEN Jinliang1,*, YANG Jun2, TAO Lingmei2
1 Department of Pesticide Science, College of Plant Protection/Key Laboratory of Monitoring and Management of Plant Diseases and Insects, Ministry of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute for the Control of Agrochemicals, Ministry of Agriculture, Beijing 100026, China; #These authors contributed equally to this paper; *Corresponding author, E-mail: jlshen@ njau.edu.cn
To screen alternative insecticides for controlling the whitebacked planthopper, Sogatella furcifera (Horváth), toxicities of 21 insecticides fallen into seven categories against the third instar nymphs of Sogatella furcifera, which were collected from Jiangpu District, Nanjing, China were evaluated by the rice stem dipping method in 2006 and 2007. The results indicated that thiamethoxam, buprofezin and imidacloprid had the highest toxicities (LC50=0.04-0.26 mg/L); nitenpyram, butylenefipronil, pymetrozine, acetamiprid, imidaclothiz, chlorpyrifos and fipronil showed good efficacy (LC50＜4.50 mg/L), suggesting that the above insecticides were potential alternatives to highlytoxic insecticides for field trials. Although isoprocarb and dichlorvos showed less efficacy (LC50＞19.85 mg/L), these two insecticides were also recommended as the alternatives because they are being applied widely in practice. According to the yeartoyear variation in susceptibility of Sogatella furcifera to the insecticides between 2006 and 2007， it was noted that the susceptibilities to chlorpyrifos, isoprocarb, carbosulfan, metolcarb were significantly reduced, with the reducing rate of 2.0 to 2.5fold. With continuous selection with imidacloprid for 15 generations, the LC50 of the population collected from Jiangpu in 2006 increased by 4.33fold and its realized heritability (h2) was 0.2295. In addition, integrated management strategies for the whitebacked planthopper were also proposed.
LI Shuyong,#,LIU Xue et al. Laboratory Screening of Alternatives to HighlyToxic Insecticides for Controlling the WhiteBacked Planthopper, Sogatella furcifera and Resistance Risk Assessment to Imidacloprid in Rice[J]. , 2009, 23(1): 79-79～84 .
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