The effect of the photoperiod on the growth and development of Semiothisa cinereari
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Key Words： Semiothisa cinerearia, photoperiod,developmental periods, eclosion
Abstract： The instars of Semiothisa cinerearia Bremer et Grey larva were exposed to 5 different light to dark (L∶D) photoperiods; 0∶24, 10∶14, 12∶12, 14∶10, 16∶8 at (25±1)℃ and RH 65%-75% in a laboratory. The duration of larval development was the shortest at L∶D=16∶8 and the duration of the 1-5 instar larval period was shortest at L∶D=14∶10. The greater the exposure to light the faster larvae developed. Variation in photoperiod had a significant effect on the developmental period of 6-7 instar larvae but not 1-5 instar larvae. Most eclosion occurred in the evening (55 %). Exposure to 8-14 h of light extended the pupal overwintering period but this decreased when pupae were exposed to 14-16 h of light. The percentage of moth emergence was highest, and the duration of pupae shortest, under an L∶D ratio of 0∶24.