一、前言 杨干象甲(Cryptorrhynchus lapathi Linne)是宝鸡地区新发现的杨树主要害虫。1979年我们在凤县苗圃中发现,邀请有关专家到现场进行验证并确定此虫为研究对象,1982年此项课题列入陕西省林业厅科研计划。经5年来调查研究,基本摸清了该虫在宝鸡地区分布、寄主种类、生活习性和危害,并发现成虫的色型和飞行行为,运用数理统 I. Preface Cryptorrhynchus lapathi Linne is a newly discovered main poplar in Baoji area. In 1979 we found in Fengxian nursery, invited experts to the scene to verify and identify the pest as the research object, in 1982 this issue included in the Shaanxi Provincial Forestry Department scientific research program. After five years of investigation and study, the insects were basically found in the distribution of Baoji, host species, habits and hazards, and found the adult color and flight behavior, the use of mathematical system