光周期对国槐尺蠖生长发育状况的影响

在温度(25±1)℃,RH65%～75%条件下,对国槐尺蠖Semiothisa cinerearia Bremer et Grey各龄幼虫分别采用0:24、10:14、12:12、14:10、1:85种光周期处理。结果表明,以14:10处理的国槐尺蠖1～5龄幼虫历期最短;以16:8处理的幼虫发育历期最短,且随着光照时间的增加,幼虫发育历期逐渐缩短;不同光周期对于6～7龄幼虫存在显著的影响,但是对于1～5龄影响不大。成虫53%～56%在夜间羽化,越冬蛹在8～14h光照范围内,随光照长度增加发育历期延长,在14～16h光照范围内,历期随光照延长而缩短。以0:24处理的蛹羽化率最高,发育历期最短。

The effect of the photoperiod on the growth and development of Semiothisa cinereari

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.