研究了分月扇舟蛾越冬代、一代幼虫在幼龄林中的测报技术及防治指标。研究认为,该蛾当杨树花芽长1cm,鳞片稍裂,平均温度达5℃时,越冬幼虫即上树啃食芽苞。3年生树有卵块株率40％以上,每株平均有1.5块卵;5年生树有卵块株率40％以上,株均卵块4块以上时需要防治。当年一代幼虫实施防治指标,3年生以下树及5年生以上树由公式:实施防治指标=防治指标/(1-寄生率)计算。 The investigation technique and control index of overwintering generation and monthly generation larvae in young forest were studied. Studies suggest that the moth when the poplar flower bud length 1cm, scales a little crack, the average temperature of 5 ℃, the overwintering larvae on the tree chewing buds. 3-year-old tree has an egg plant rate of 40% or more, an average of 1.5 eggs per plant; 5-year-old tree has an egg plant rate of 40% or more, each strain oocyte block more than 4 need prevention and treatment. When the generation of larvae to implement the control indicators, trees below 3 years old and tree above 5 years by the formula: the implementation of control indicators = control indicators / (1-parasitic) calculation.