黄褐天幕毛虫发生规律及其飞机防治的研究

黄褐天幕毛虫在黑龙江省大兴安岭地区1年发生1代，幼虫在卵内越冬，第2年4月下旬孵化，主要危害栎树、山杨、白桦、黑桦等阔叶树，5月上旬～6月上旬为暴食期。虫口密度与林分组成的关系为栎树纯林和栎树比例在9以上的林分平均虫口在118头／株以上，危害重；而栎树比例在4以下的林分平均虫口在50头／株以上，危害轻。采用飞机超低量喷洒22．5％杀虫优油剂，防治效果为93．61％。98.05％。

Occurrence Rules Of Malacosoma Neustria Testacea Motschulsky And Its Airplane Prevention

Malacosoma neustria testacea Motschulsky was found to have one generation a year in Daxing'anling district of Heilongjiang province. Its instar larvae hibernated in its nit and incubated at the last ten - day of next April. It mainly does damage to some board - leaved tree such as robur, poplar and birch, and its hungry period is from first ten - day of May to June. The average population density is above 118 in the forest stand that robur can account for 90% , and 50 in a forest stand that robur account for 40% . Using airplane to spray insecticide with consistence of 22.5% , the prevention result can reach 93.61% -98.05%.