Sublethal effects of imidacloprid on the survival and reproduction of Schizaphis graminum (Rondani)
Author of the article:XIE Jia-Yan;WU Cong;LIN Jia;LI Rui;CAI Guang-Hua
Author's Workplace:School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China;School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China;School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China;School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China;School of Life Science and Technology, Wuhan Polytechnic University, Wuhan 430023, China
Key Words:Schizaphis graminum; imidacloprid; sublethal effect; survival; reproductive period
Abstract:
[Objectives] The effects of
sublethal concentrations of imidacloprid on the survival and reproduction of
three successive generations of Schizaphis
graminum (Rondani) were determined. [Methods] The LC50 of imidacloprid to S. graminum was tested using the leaf-dip
method. The
parental (F0) generation
was exposed to either the LC40 dose of imidacloprid (LC40 group), or distilled water (control group), and the survival and reproduction
of this and two successive generations were measured and compared. [Results] All three LC40 groups had
significantly lower longevity, fewer offspring per female, and a shorter reproductive
period, than the F0 control
group. The survival and reproductive parameters of the F1 and F2 LC40 groups,
were, however, no different to those of the control group. In addition, the number of offspring per female, and other reproductive
parameters of LC40 groups significantly increased in successive generations. [Conclusion] Exposure to a sublethal dose of
imidacloprid significantly reduces the survival and reproduction of the F0 generation of S.
graminum but the magnitude of these effects decreases in successive
generations. The survival and reproductive parameters of the F1 and F2 LC40 groups were not
significantly different to those of the control group.