Abstract
With three different methods no significant influence of temperature on the timing process in photoperiodic diapause induction of Pieris brassicae was detectable. Between 15 and 21°C the physiological status in which light strongly inhibits diapause is always reached about 14 -16 hours after the beginning of the daily light period. The diurnal changes in responsiveness to light correspond to diurnal changes in the volume of the corpora allata.
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