辉南县森防检疫站应用速杀丁和滑石粉制成毒笔,每年四月下旬在越冬代幼虫上树前和十月上旬越冬代幼虫准备下树越冬时,用毒笔在树干下部画两道毒环。两环间相距10—15cm为宽。该站在500亩落叶松人工林内进行了防治试验,结果防治效果达到86.8%。每只毒 Huinan County Forest Prevention and Quarantine Station speed Ding Ding and talc made of poison pen, the end of April each year in the winter before the larvae on the tree and in early October overwintering adult larvae to prepare for the next winter, with a poison pen in the trunk painting Two poison ring. Between the two rings 10-15cm wide. The station in 500 acres of larch plantation prevention and control tests were conducted, the results of the control effect of 86.8%. Each poison