The results of resonance experiments gave evidence that circadian organization was involved in photoperiodic diapause induction of Pieris brassicae. However, giving the larvae an artificial diet instead of the host plant deeply altered the resonance effect and led to a response that could be accounted for by the operation of a noncircadian timer (hourglass). This important change, however, had no effect on the insect's ability to discriminate between short- and long-day 24-hr cycles. Thus, it is possible via the metabolism to switch the pho toperiodic mechanism to a circadian or an hourglass-like mode of operation without impairing the photoperiodic time measurement.
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