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1 January 2014 Sublethal Effects of Virtako on Life Table Parameters and Wing Formation of the Brown Planthopper (Homoptera: Delphacidae)
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The brown planthopper, Nilaparvata lugens (Stål), is a major rice pest in many Asian countries. Virtako™ (Syngenta, Switzerland) is a relatively new mixture insecticide, containing 20% chlorantraniliprole and 20% thiamethoxam, which has low mammalian toxicity and high efficacy against Lepidoptera, Coleoptera, Diptera, Hemiptera and Orthoptera. The effects of this insecticide on life table parameters and wing formation of N. lugens were examined in the laboratory. The results showed that Virtako could significantly reduce the fecundity of N. lugens, demonstrating further activity against this pest in addition to direct toxicity. The fecundity (eggs produced per female) of N. lugens treated with the sublethal rates (LC10 and LC30) of Virtako was 75.6% and 59.4% of the control in macropterous cohorts, and 73.0% and 59.3% in brachypterous cohorts, respectively. The relative fitness values were 0.56 and 0.31 for treatments with the LC10, and 0.53 and 0.32 for treatments with the LC30 in macropterous and brachypterous cohorts, respectively. Treatment with sublethal concentrations of Virtako showed the significant induction of macropterous offspring in both macropterous and brachypterous cohorts, which are important in the control of N. lugens, particularly in the prediction of the population dynamics.

Yong Chen, Jie Zhang, Xiaowa Qin, Jie Liu, Qi Liu, and Runjie Zhang "Sublethal Effects of Virtako on Life Table Parameters and Wing Formation of the Brown Planthopper (Homoptera: Delphacidae)," Journal of Entomological Science 49(1), 21-29, (1 January 2014).
Received: 21 February 2013; Accepted: 1 June 2013; Published: 1 January 2014

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