目前随着榆树造林面积的不断增加,春尺蠖的危害也日趋严重。为综合防治春尺蠖,经济有效地把该虫控制在不造成经济损失的水平,我们在上级业务部门的组织和指导下,开展了受害允许水平和防治指标的研究,现将结果初报如下。 At present, as the area of ​​elm afforestation continues to increase, the harm of choriocopsis is also becoming more and more serious. In order to comprehensively prevent and control chilopracton, economically and effectively control the pest at a level that does not cause economic losses, we conducted research on the allowable levels of victimization and prevention and control targets under the guidance and organization of higher-level business units. The results are initially reported as follows.