Abstract: The study showed that the functional response of predation on M.persicae by the female and male adults of P.japonica with different extents of starvation belonged to the type of Holling Ⅱ.Female adults had a larger attacking rate than male adults, but the predacious amount of M.persicae by female and male adult predators of different extent of starvation within 24hrs had no significant difference.The predacious amount by female adult was larger than that of male.The significant difference of predacious amount between female and male adults increased with the time of their starvation and the prey density.The predation by unstarved female and male adult predators on M.persicae in 24 hours was concentrated at 6◇00～18◇00 and the predation rate (V)between female and male adults had no significant difference.The predation by starved female and male adults for 48h on the prey in 24 hours was at 0～4 hours after the experiment started, and the predation rate(V)between female and male starved adults had no significant difference either.

Key words: Starvation, Propylaea japonica female and male adults, Myzus persicae, Predatism