Abstract
The long-day insectYponomeuta vigintipunctatus was subjected to various combinations of temperature and photoperiod. The photoperiodic induction curve at 10°C resembled the one at 20°C, but with a shift of the critical photoperiod towards the shorter day-length. Such unusual averting of diapause at lower temperatures in combination with intermediate long-day photoperiods has still been described in only few insect species of the temperate zone.
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