Photoperiod and Temperature Influences on Diapause in Eggs of the Floodwater Mosquito, Aedes Dorsalis (Meigen) (Diptera: Culicidae)1

Diapause was elicited in eggs of the mosquito Aedes dorsalis (Meigen) from central Washington (46° N lat.) in response to short photoperiod and low temperature. High temperature removed the effect of short photoperiod, and low temperature reduced hatching in response to long photoperiod. Prolonged exposure to low temperature broke diapause; switching from high to low temperature increased diapause and the reverse temperature change had the opposite effect. A maternal influence on diapause was also noted.