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New Zealand Plant Protection 62 (2009): 156-160

Diurnal rhythms of emergence, host feeding and oviposition of Eretmocerus warrae (Hymenoptera: Aphelinidae)

A. Hanan, X.Z. He, M. Shakeel and Q. Wang


Eretmocerus warrae is a parasitoid of greenhouse whitefly, Trialeurodes vaporariorum. It was first detected in New Zealand in 1997 during a survey of greenhouses in Auckland. In the laboratory at 221C, 605% RH and 16:8 h light:dark, significantly higher adult emergence occurred after 2-3 h of light. No emergence was observed during the scotophase. Host feeding and oviposition occurred in both the photophase and scotophase. In the photophase, host feeding by E. warrae tended to be higher after 4-6 h of light than at other stages of photophase. In the scotophase, the number of hosts fed on by E. warrae was significantly higher 2 h before lights came on. The number of eggs laid was significantly higher 10-14 h into the photophase than at other stages. There tended to be higher oviposition in the first 2 h of darkness.

Keywords: Eretmocerus warrae, whitefly, emergence, host feeding, eggs laid.

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