Diapause induction in Harbin population of Colaphellus bowringi
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Key Words：diapause induction, Colaphellus bowringi, Harbin population, photoperiod, temperature, food
Abstract： The effect of photoperiod, temperature and food on diapause induction in a Harbin population of Colaphellus bowringi Baly was investigated. There was no photoperiodic response, and at a constant temperature of 20-30℃ the diapause rate was 91.8%-100% at various photoperiods. Temperature had some influence on diapause induction; lower temperatures could promote diapause, but higher temperatures inhibited diapause in a few individuals. A thermoperiod of C12∶T12 combined with a photoperiod of L12∶D12 had no effect on diapause at a mean temperature of 25℃. The percentage of diapausing individuals was 89.5%-100% at 25℃ and 76.9%-100% at 28℃. Host-plants had a significant effect on diapause; the highest diapause rate was observed in individuals fed leaves of Raphanus sativus and the lowest in those fed leaves of Lepidum sativum.