论文部分内容阅读
草地螟Loxostege sticticalis以老熟幼虫滞育越冬。在室内通过人工诱导的方法对其滞育的光周期和温度诱导条件进行了研究。结果表明:草地螟是一种典型的长日照发育型种类。光周期、温度及其交互作用均对草地螟滞育诱导具有重要影响,其中光周期起主导作用,温度伴随着光周期起作用。对幼虫滞育诱导最有效的光周期是L12∶D12;随着温度的升高,临界光周期呈缩短趋势(18℃除外)。18,22,26和30℃条件下幼虫滞育的临界日长依次为13.97,14.48,13.92和12.88h。光敏感实验揭示:21℃时草地螟对光照反应最敏感时期为幼虫孵化后的11～17d(约5龄幼虫),但孵化后7～11d(约4龄幼虫)的短光照积累对提高滞育率也有重要作用,可以将滞育率从40.0%提高到90.0%。
Meadow borers Loxostege sticticalis overwinter with mature larvae. The photoperiod and temperature-induced conditions of diapause were studied indoors by artificial induction method. The results showed that: Meadow borer is a typical long-day developmental types. The photoperiod, temperature and their interaction all had important effects on the diapause induction of Meadow Stem, in which the photoperiod played a leading role and the temperture influenced the photoperiod. The most effective photoperiod of larval induction was L12:D12. With the increase of temperature, the critical photoperiod was shortened (except 18 ℃). The critical day length of larval diapause at 18, 22, 26 and 30 ℃ were 13.97, 14.48, 13.92 and 12.88 h, respectively. Photo-sensitivity experiments revealed that the larvae were most sensitive to light at 11 ℃ for 11-17 days (about 5th instar larvae) after hatching, but the short-light accumulation of larvae from 7 to 11 days after hatching (about 4th instar larvae) Fertility also plays an important role in increasing the rate of diapause from 40.0% to 90.0%.