东亚小花蝽对马铃薯块茎蛾和番茄潜叶蛾的适合度及捕食能力比较OA

Phthorimaea operculella and Phthorimaea absoluta,which are closely related congeneric species,exhibit high similarity in morphology,physiology,and ecological niche and coinfest potato in China.This study systematically evaluated the biocontrol efficacy of the predatory bug Orius sauteri,an important biological control agent,against these two closely related pests by combining analyses of the predatory functional response and two-sex life table.The results demonstrated that the predatory functional responses of both 5th instar nymphs and adults of O.sauteri preying on the eggs and neonate larvae of both pests conformed to the Holling-Ⅱ model but exhibited interspecific and stage-specific variations.O.sauteri exhibited significantly stronger predation capacity on P.absoluta eggs than on P.operculella eggs,whereas its predation on neonate larvae was significantly higher for P.operculella than for P.absoluta.The search effect of all predator stages decreased with increasing prey density and was influenced by both the predator's developmental stages and prey species.O.sauteri can complete its entire life cycle when fed on the eggs of either of the two closely related pest species.However,its performance was superior when fed P.operculella eggs:its development time was significantly shortened,its adult longevity was extended,and its fecundity(eggs per single female)was significantly increased.Consequently,this animal diet resulted in a shorter mean generation time(T)and higher values for the intrinsic rate of increase(r)and finite rate of increase(λ),indicating a significantly enhanced population growth potential.In conclusion,O.sauteri possesses biocontrol potential against both closely related pest species,but the efficacy and population support capability differ between them.P.operculella eggs proved to be a more advantageous food resource.These findings provide a theoretical basis for utilizing O.sauteri to manage mixed infestations of these two closely related pests on solanaceous crops.