Abstract
Aedes sierrensis (Ludlow) (Diptera: Culicidae) relies upon photoperiod to initiate a 4th instar diapause at 16.5°C. Short days elicited 100% diapause among larvae from central Oregon and northern California, but thereafter the incidence of diapause declines with latitude so that in southern California only 35% of the sample populations entered diapause. Among that portion of the population capable of responding to day length, the critical photoperiod increased by one h for each 4.8° increase in latitude of origin.
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