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Photoperiodic control of diapause induction was investigated in the short-day species, Colaphellus bowringi, which enters summer and winter diapause as adult in the soil. Photoperiodic responses at 25 and 28 o C revealed a critical night length between 10 and 12 h; night lengths >=12 h prevented diapause, whereas night lengths <12 h induced summer diapause in different degree. Experiments...