Because of the dichotomy of the pest ontogeny, most work on bio logical control has examined the direct predation or parasitism by natural enemies on sessile immature whiteflies (Hoddle al 1998: Gerling et al., 2001: Naranjo, 2001). In contrast, very few studies have addressed the impact of natural enemies on mobile whitefly adults that can escape from the natural enemies. Recent studies have shown that adult B. argentifolii can learn to avoid host plants harboring predatory mites (Nomikou et al., 2003; Meng et al., 2006). That is, female adults avoid allocating their reproductive potential at places where their offspring would be exposed to high predation risks