Hormetic Effect of Imicacloprid on Fecundity of Myzus persicae (Sulzer) and Impacts on the Control Effencicy of Pirata subpiraticus

The term hormesis was coined to describe a phenomenon where exposure to high levels of stressors is inhibitory whereas low dose is stimulatory.The effects of low dose imidacloprid and cypermethrin on the fecundity of Myzus persicae(Sulzer) and effect of low dose imidacloprid on the controlling effencicy of Pirata subpiraticus were studied in the laboratory.The results showed that the low-dose imidacloprid induced the stimulatory effect on fecundity of M.persicae,while the high concentrations of imidacloprid inhibited fecundity,which suggested the occurrence of hormesis was observed.And the insect-control power and the relative activity of spider was decreased significantly by the low-dose imidacloprid.Results in this study indicated that the low-dose imidacloprid may induce the resurgence of M.persicae.