柳蝙蛾生物学特性及发生规律

Biological characteristics and occurrence regularity of Phassus excrescens Bulter.

于 1997～ 2 0 0 0年在黑龙江和吉林东部地区 ,对柳蝙蛾的生物学习性和发生规律进行了研究 .在该地区柳蝙蛾多数个体 2年完成一个世代 ,分别以卵和幼虫 2次越冬 .每年 6月底、7月上旬 ,幼虫转移到水曲柳上危害 .上树后的幼虫 ,在室内人工饲养条件下发育了 6龄仍未化蛹 .在水曲柳人工林中 ,主要危害 2～ 2 0年的水曲柳人工幼林的干基部 (2 0cm以下 )和干部 .水曲柳蝙蝠蛾的发生量与林龄和林分结构密切相关 .以水曲柳人工纯林以及红松水曲柳混交林受害较重 ,而落叶松水曲柳混交林的受害程度最轻 .

The biological characterisitics and occurrence regularity of Phassus excrescens were studied from 1997 to 2000 in the eastern part of Heilongjiang Province and Jilin Province.In this area,most of its individuals took two years to finish one generation,and over wintered two times with eggs and larvae,respectively.At the end of June or the first ten days of July,larvae transferred to damage Fraxinus mandshurica. Feeding with artificial diet indoor,the larvae finished 6 instars before pupation.In artificial Manchurican ash forest,the larva mainly damaged the truck basal(below 20cm) or truck of 2 to 20 years old Fraxinus mandshurica. The occurrence amount of this species was closely related to the forest age and the stand structure.Usually,pure artificial Fraxinus mandshurica stands and Fraxinus mandshurica Pinus koraiensis mixed stands were damaged seriously,while Fraxinus mandshurica Larix mixed forests were damaged lightly.