在北京中国儿童少年活动中心院内,主要的绿化树种是油松,共394株,因受微红稍斑螟危害,致使松树的枯梢遍布,侧梢丛生。1982至1984年,连年用高浓度(700倍)氧化乐果和杀螟松等农药喷雾防治,每年7—8次,并辅以人工剪除虫梢,但效果不佳,相反每次喷 In the courtyard of the Beijing Children and Children’s Activity Center in Beijing, the main afforested tree species is Pinus tabulaeformis, with a total of 394 strains. Due to the damage caused by the reddish cutworm, the shrubs of the pine trees are all over and the shoots grow up. 1982 to 1984, successive years with high concentrations (700 times) of omethoate and fenitroth and other pesticide spray control, 7-8 times a year, supplemented by manual removal of insects, but the effect is not good, on the contrary each spray