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在东北地区青杨叶锈病严重发生地区，对小里杨１．２．３年生苗木，分别按病情等级对苗木的生长量、损失率进行测定，确定了经济阈值和防治指标：插条苗经济阈值的病情指数为１４，防治指标的病情指数１５～１６时为重点防治，大于１８时应全面防治；平茬苗经济阈值的病情指数为２１，防治指标的病情指数２２～２３时为重点防治，大于２３时应全面防治；养干苗经济阈值的病情指数为２４，防治指标的病情指数２５～２６时为重点防治，大于２６时应全面防治
In the northeastern region of the serious area of poplar leaf rust occurs, the Xiaoli Yang 1.2.3-year-old seedlings, respectively, according to the severity level of seedlings growth, loss rate was determined to determine the economic threshold and prevention and control indicators: cuttings economy The disease index of the threshold value is 14, the disease index of the control index is the key prevention and control when 15 ~ 16, and should be comprehensively controlled when it is greater than 18. The disease index of the economic threshold of the stubble seedling is 21, and the disease index of the prevention and control index is the key prevention and control , Greater than 23 should be comprehensive prevention and treatment; raised dry economy threshold value of the disease index 24, the index of prevention and treatment of disease index 25-26 when the focus of prevention and control, more than 26 should be comprehensive prevention and treatment