Study on Nasonia vitripennis releasing strategies.

Objective To study the optimal strategies of Nasonia vitripennis releasing outdoors. Methods Releasing the Nasonia vitripennis parasitized Boettcherisca peregrine pupae outdoors under fine day,cloudy and rain day,using four releasing methods.The emergence ratios of N.vitripennis and the disappearance ratio of B.peregrine pupae were examined respectively.Results The nylon net was the best method for releasing the parasitoid,the emergence ratio of the parasitoid were above 70% and no B.peregrine pupae were disappeared under different weather;fine day and cloudy day were the optimal releasing weather;the B.peregrine pupae parasitized after 4~10 days were fit for outdoor releasing. Conclusion The nylon net is the best method,weather and time of releasing N.vitripennis using parasitized B.peregrine pupae outdoors.