Effect of Cold Storage on Development and Dispersal of Encarsia formosa (Hymenoptera: Aphelinidae)

doi:10.16409/j.cnki.2095-039x.2019.04.010

Abstract

Abstract: Encarsia Formosa, which has been identified as an effective parasitic wasp of both Bemisia tabaci and Trialeurodes vaporariorum, has currently been mass produced for control of whiteflies on a wide range of greenhouse vegetable crops. The parasitic wasp usually needs to be stored before augmentative releases, and thus cold storage has been proved to be an important process for mass production and release of parasitoids. In the present study, we exposed pupae of E. formosa to different cold storage regimes, and determined the influence of cold storage on pupal development and several fitness-related traits. We also examined the dispersal ability and parasitic rates on post-storage in the greenhouse. The results showed that E. formosa pupae developed during cold storage at both 8℃ and 4℃. The middle stage pupae appeared to suffer lower mortality compared to the early or late stage pupae. The three fitness parameters (eclosion, parasitism and adult longevity) of E. formosa was obviously improved (P<0.05) when the pupae were exposed to a cold acclimation (12℃ for 7 days). The parasitic wasps that experienced non-cold storage dispersed mainly within a distance of 1-4 m from the released point while those underwent cold storage dispersed mainly within a distance of 1-2 m. The parasitism rate in the greenhouse was also obviously improved (P<0.05) when the pupae were exposed to cold acclimation (12℃ for 7 days). These results are significant for the biological control using E. formosa.

Key words: Encarsia formosa, cold storage, cold acclimation, fitness, dispersal

CLC Number:

S476.3

ZHAO Jing, WANG Lei, ZHANG Fan, CAO Hui, WANG Su. Effect of Cold Storage on Development and Dispersal of Encarsia formosa (Hymenoptera: Aphelinidae)[J]. Chinese Journal Of Biological Control, 2019, 35(4): 497-503.

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