Predation function study of Orius maxidentex against Echinothrips americanus
To clarify the predation response and pest control efficacy of Orius maxidentex on Echinothrips americanus,the predatory function response,search effect,disturbance response,intensity of apportionment competition and preference of O.maxidentex(5th instar nymph and female adult)on E.americanus(2nd instar nymph,pupa and adult)were studied at 27℃.The results showed that the functional response of O.maxidentex to E.americanus were in accordance with HollingⅡ-type and HollingⅢ-type disc equations.According to the HollingⅡ-type model,the predation capability(a'/Th)to 2 nd instar nymph of E.americanus of female adult and 5 th instar nymph of O.maxidentex was the strongest,52.97 and 58.15,respectively;the daily maximum consumption to 2nd instar nymph of E.americanus of female adult and 5th instar nymph of O.maxidentex was largest,47.38 and 49.22,respectively.According to the HollingⅢ-type model,the daily maximum consumption to 2nd instar nymph of E.americanus of female adult and 5th instar nymph of O.maxidentex was largest,27.50 and 27.41,respectively.The predation number gradually increases with the increase of prey density,and the increase rate slowed down after reaching a certain density;the search effect gradually decreases with the increase of prey density.A strong self-interference existed among O.maxidentex,as the predation rate decrease with the increase in the density of O.maxidentex,the self-interference fitted Hassell-Varley model.O.maxidentex adult and tended to prey 2nd instar nymph of E.americanus,positive preference for E.americanus adult,and less preference for pupa.The results supported O.maxidentex was a potential domestic natural enemy against E.americanus.
万方数据
维普
