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1 May 2008 Role of Photoperiod and Temperature in Diapause Induction of Endoparasitoid Wasp Microplitis mediator (Hymenoptera: Braconidae)
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Abstract

Diapause in Microplitis mediator Haliday (Hymenoptera: Braconidae) is manifested during the pupal stage and normally occurs during the winter season because of a photoperiodic response that is highly dependent on temperature. No diapause was observed at temperatures above 20°C regardless of the photoperiod. Only a small part of the population entered diapause at 20°C under short daylengths of light:dark 8:16–12:12. In contrast, when larvae were exposed to 16, 18, and 20°C combined with a photoperiod of 10:14, the percentages of parasitoids that entered pupal diapause was 97.9, 87.8, and 26.2%, respectively. Critical photoperiods were determined to be 7.03:16.97 and 12.21:11.79 at 16°C and 6.75:17.25 and 12.03:11.97 at 18°C. The second instar of the parasitoid was the most sensitive to diapause induction for the photoperiods and temperatures tested.

Wenxiang Li, Jiancheng Li, Thomas A. Coudron, Ziyun Lu, Wenliang Pan, Xiaoxia Liu, and Qingwen Zhang "Role of Photoperiod and Temperature in Diapause Induction of Endoparasitoid Wasp Microplitis mediator (Hymenoptera: Braconidae)," Annals of the Entomological Society of America 101(3), 613-618, (1 May 2008). https://doi.org/10.1603/0013-8746(2008)101[613:ROPATI]2.0.CO;2
Received: 21 September 2007; Accepted: 1 January 2008; Published: 1 May 2008
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