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1 December 2012 Resistance Monitoring and Assessment of Resistance Risk to Pymetrozine in Laodelphax striatellus (Hemiptera: Delphacidae)
Lanfeng Ban, Shuai Zhang, Ziyang Huang, Yueping He, Yongqiang Peng, Congfen Gao
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Abstract

Laodelphax striatellus (Fallén) is a major pest of cultivated rice. Pymetrozine, a pyridine azomethine compound, represents a novel insecticide with a selective activity against sucking pests. The resistance of L. striatellus to thiamethoxam, nitenpyram, chlorpyrifos, and pymetrozine in five field populations, collected from Jiangsu, Anhui, and Zhejiang in China, was monitored from 2009 to 2011 in laboratory. All the populations kept susceptible to minor resistance to thiamethoxam and nitenpyram in the 3 yr (0.6- to 2.2-fold and 0.8- to 3.8-fold, respectively), while the insects developed low to high level resistance to chlorpyrifos (9.7- to 76.1-fold). Three populations were all susceptible to pymetrozine (1.1- to 2.1-fold) in 2009, but the Wuxi and Yancheng populations developed low level resistance to pymetrozine (5.5-fold and 5.3-fold, respectively) in 2011. Meanwhile, the resistance level of the selected strain reared in laboratory increased by 1.0-fold after 12-generation selection with pymetrozine. The realized heritability (h2) of resistance at different selection stages was estimated as 0.0470 (F1 to F13) and 0.2070 (F5 to F13) by using threshold trait analysis. It suggested that L. striatellus had the definite risk of resistance to pymetrozine.

© 2012 Entomological Society of America
Lanfeng Ban, Shuai Zhang, Ziyang Huang, Yueping He, Yongqiang Peng, and Congfen Gao "Resistance Monitoring and Assessment of Resistance Risk to Pymetrozine in Laodelphax striatellus (Hemiptera: Delphacidae)," Journal of Economic Entomology 105(6), 2129-2135, (1 December 2012). https://doi.org/10.1603/EC12213
Received: 25 May 2012; Accepted: 24 August 2012; Published: 1 December 2012
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KEYWORDS
insecticide
Laodelphax striatellus
resistance monitoring
resistance risk assessment
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