栎枯叶蛾生物学特性的观察研究

Observation on the Bionomics of Bhimasp.in Tusser Raising Field

栎枯叶蛾Ｂｈｉｍａｓｐ．在辽宁省１年发生１代，以卵在枝条上越冬。翌年４月底５月上旬越冬卵孵化。幼虫７龄，历经９５～１１２ｄ。幼虫各龄形态变化较大，５，６，７龄的取食量占９３％以上。１～３龄幼虫群居，４龄后分散为害。成虫有较强的趋光性，卵多产于３～４年生的辽东栎或蒙古栎的枝条上，以４纵行紧密的排列呈长条状卵块。其上覆以灰褐色尾毛。卵块在柞蚕场内的分布有一定的规律性。

Bionomics of Bhima sp.was observed in Liaoning Province.The species is one generation a year,overwintering by egg stage which hatches at the end of April and reaches hatching peak in the beginning of May.The larva have 7 instars,lasting 95～112 days.The morphological characters of the larva at different in stars vary considerably.Feeding is mainly focus on the last three in stars of the larva.First three in star larva swarm together and disperse after the 4th instar.Adults have phototaxis,laying eggs on the branches of 3 or 4 year old East Liaoning Oak (Quercus liaotungensis Koid.) and Mongolian Oak (Quercus mongolica Fisch.).Egg mass is in densely placed in four lines,covered by the black brown caudal seta of the adults.