油松毛虫越冬状况及其对冬防效果的影响

Investigation on the overwintering status of Dendrolimus tabulaeformis Tsai et Liu and its influence on winter control

赤峰地区油松毛虫 Dendrolimus tabulaeformis Tsai et L iu在树干垂直方向上虫口分布百分率呈递减趋势 ,树干不同部位越冬松毛虫死亡率无显著差异 ,山坡不同坡向之间 ,山坡与平地之间树干上越冬松毛虫死亡率也无显著差异 ,树干上越冬的松毛虫仅占越冬总虫口的 3.7% ,且保持了 98%的高死亡率 。

In Chifeng area,the population distribution of Dendrolimus tabulaeformis progressively decreases on trunk vertically.There is no significant differences among the mortalities of overwintering Dendrolimus tabulaeformis on different parts of trunks,directions of mountain slopes and between hillsides and plains.Only 3.7% of the overwintering caterpillars are on trunk, and maintain a high mortality of 98%.So it wont influence the control in winter.