不同龄期中华大刀螳对黑腹果蝇成虫的捕食效果OA

[Objective]The predation capacity of Tenodera sinensis nymphs at different instars against Drosophila melanogaster adults was investigated to evaluate the potential of T.sinensis in biological control of D.melanogaster.[Method]Under the controlled laboratory condition,D.melanogaster adults at prey densities of 5,15,25,35,and 45 adults per container were provided for T.sinensis nymphs at 1st-8th instars after 24h starvation.The daily predation rate of T.sinensis nymphs was determined.The predation functional response of T.sinensis nymphs against D.melanogaster adults was fittingly calculated by Holling's model to analyze its searching efficiency.[Result]The daily predation rate of T.sinensis nymphs at 1st-2nd instar against D.melanogaster adults tended to stable when the prey density exceeded 15 adults per container.In contrast,the predation rate of nymphs at 3rd-8th instar increased with increase of prey density,and the predation rate of nymphs at 4th and 5th instar against D.melanogaster adults under the tested prey densities was higher than those of T.sinensis nymphs at other instars significantly.The predation functional response of T.sinensis nymphs at 1st-8th instar against D.melanogaster adults accorded with Holling Ⅱ model.The predation time,predation capacity and daily predation rate of T.sinensis nymphs at 5th instar against D.melanogaster adults were 0.051 d,24.118/d and 19.608 respectively.The predation time,predation capacity and daily predation rate of T.sinensis nymphs at 4th instar and 6th instar against D.melanogaster adults were 0.057 d,23.263/d and 17.544/d,and 0.061 d,20.754/d and 16.393 separately.The searching efficiency of T.sinensis nymphs at 1st-8th instars against D.melanogaster adults decreased with increase of prey density.[Conclusion]The T.sinensis nymphs at 4th-6th instar have the better control effect against D.melano-gaster adults.