赭色松毛虫在浙江西部拔海300-600米的次生林中为害马尾松,针叶食光后亦取食松梢及树皮。一年发生二代,以4-5龄幼虫在针叶丛中或树皮裂缝中越冬,3月上旬开始活动取食,4月及7月为越冬代及第一代幼虫猖獗为害期。第二代幼虫子11月下旬越冬,老熟幼虫下树在灌木杂草丛中结茧,可人工采茧防治;3龄前幼虫期用“621”烟雾剂防治,效果达98%以上。 Sienna pine caterpillars in the western Zhejiang pull the sea 300-600 meters secondary forest harmful Pinus massoniana, pine needles and bark after feeding. Two generations a year, with 4-5 instar larvae in the bark or bark cracks in the winter, early March began feeding activities, April and July for the overwintering generation and the first generation of larvae rampant period. The second generation of larvae overwintered in late November, the larvae of mature larvae cocoon in shrub weeds can be artificial cocoon control; pre-3 larvae with “621” aerosol control, the effect of more than 98%.