Abstract
The multivoltine hawthorn lace bug, Corythucha cydoniae (Fitch), undergoes a reproductive diapause from late summer to spring. In the laboratory, the critical photoperiod for diapause induction fell between 13:11 and 14:10 L:D h. High temperature averted diapause in a proportion (≍25%) of the females that were reared under short daylengths; high temperature also appeared to diminish the intensity of diapause in females reared under daylengths near the critical photoperiod. Diapause in this long-day insect expresses several features that are typical of imaginal diapause. For example, the preimaginal stages perceive and respond to diapause-inducing photoperiods, but the adult is the ultimate sensitive stage. Diapause is induced earlier in females that experience short daylengths as fourth and fifth instars than in females that are transferred to short days as adults. Mature females remain sensitive to diapause-inducing photoperiods for at least 2 wk after emergence. Photoperiod also appears to playa role in diapause maintenance.
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