为明确20%氯虫苯甲酰胺悬浮剂防治美国白蛾幼虫的最适用药剂量和最佳防治龄期,国家林业局森林病虫害防治总站等单位研究人员联合开展了直升机超低容量喷雾防治试验。结果表明,20%氯虫苯甲酰胺悬浮剂对美国白蛾2～3龄幼虫具有较好的速效性和较长的持效期。在120mL/hm~2和150mL/hm~2用药剂量下,美国白蛾2龄幼虫虫口减退率施药后2天分别为 In order to clarify the most suitable dose and the best control age of 20% chlorantranil-5-ylbenzamide suspending agent for the prevention and cure of American white moth larvae, researchers at SFA Forest Pest Control Terminals jointly carried out experiments on ultra-low volume aerosol spraying of helicopters. The results showed that 20% chlorantranilone suspending agent had good fast-acting and long-lasting effect on 2nd-3rd instar larvae of American white moth. At the doses of 120 mL / hm ~ 2 and 150 mL / hm ~ 2, the reduction rates of the 2nd instar larvae of C. crassiphylla were respectively 2 days after application