Photoperiod and temperature response of diapause induction in Diaphania perspectalis (Lepidoptera: Pyralidae)
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Key Words：Diaphania perspectalis,diapause,photoperiod,temperature,sensitive stage
Abstract： In order to study the over-wintering diapuase characteristics of Diaphania perspectalis (Walker),the photoperiodic response of diapause induction and the photosensitive larval stage were investigated under natural and constant temperature conditions.The results showed that the photoperiodic response is a long day response type,and that short day-length is the most important factor for the induction of larval diapause.The photoperiodic response in this moth is temperature sensitive,under constant temperatures of 25 ℃ and 28 ℃,the critical day-length was 13 h 36 min and 12 h 50 min,respectively.Under a daily mean temperature of 26.7 ℃,the critical day-length was 13 h 40 min.Experiments at a constant temperature of 25 ℃ showed that larvae are sensitive to photoperiod mainly during the 2nd to 3rd larval instar,which is from four to nine days after hatching.