Longterm influences of sublethal dose of imidacloprid and pymetrozine on reproduction and biological fitness of the brown planthopper(BPH) were evaluated. Bioassay results showed that the LC50 values for imidacloprid and pymetrozine were 42.41 mg/L and 396.46 mg/L, respectively, suggesting imidacloprid was approximately 9.35 times more toxic than pymetrozine. The effects of the sublethal dose (LC30) of imidacloprid and pymetrozine on the fitness of the brown planthopper were evaluated by constructing and comparing the life tables. Results revealed that the biological fitness of BPH exposed to imidacloprid and pymetrozine had reduced to only 83.8% and 8.4% of the control, respectively. In imidacloprid treatment, there was only an obvious decline in emergence rate of adult. However, the emergence rate of adult, female adult ratio, female adult duration and eggs hatching rate were conspicuously reduced under pymetrozine treatment. In addition, the egg laying and fecundity fastigium of BPH exposed to sublethal pymetrozine were postponed compared to the control, which is probably correlated with the delayed development of genitalia caused by pymetrozine’s feeding inhibition effects.
LIU Shuhua1 , YANG Baojun1 , LIU Shuang2 , DING Zhiping3, LIU Zewen3 , TANG Jian1,*
. Effects of Sublethal Dose of Imidacloprid and Pymetrozine on Relative Biological Fitness of Brown Planthopper, Nilaparvata lugens[J]. Chinese Journal OF Rice Science, 2012
, 26(3)
: 361
-364
.
DOI: 10.3969/j.issn.10017216.2012.03.016
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