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The Canadian Entomologist 130: 859 -867 (1998) Effects of photoperiod, time of year, temperature, and an insect growth regulator (fenoxycarb) on ovarian development rate in overwintering pear psylla, Cacopsylla pyricola (Foerster), were determined. Winterform pear psylla were collected from the field at intervals between October and February, and reared at 20°C and one of three treatments: short-day photoperiod, long-day photoperiod, or short-day Xhfl THE CANADIAN ENTOMOLOGIST November/December 1998 Ct C stoppC par de basses tempkratures. Le fenoxycarbe a favoris6 un dCveloppement ovarien rapide, mCme chez les insectes capturCs en octobre; le taux de dCveloppement n'a Ct C que 1Cgbrement plus rapide chez les psylles traitCes en fCvrier.[Traduit par la RCdaction]