Role of Photoperiod and Temperature in Diapause Induction of Endoparasitoid Wasp Microplitis mediator (Hymenoptera: Braconidae)
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چکیده
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 Cregardless of the photoperiod.Only a small part of the population entered diapause at 20 Cunder short daylengths of light:dark 8:16Ð12:12. In contrast, when larvae were exposed to 16, 18, and 20 C combinedwith 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.
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