Abstract
At a constant temperature of 18�C, exposure of Tricholioproctia impatiens to varied daily photophases resulted in a typical long-day response of diapause induction. A critical daily photophase of 13 h marked the transition between diapause induction and continuous development. At 25�C diapause was supressed with no apparent critical photophase. Diapause occurred at 106 h at 18�C and 48 h at 25�C following pupariation.

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