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杨干象Cryptorrhynchus lapathi L.国内分布于东北地区及陕西省,国外分布于日本、朝鲜、苏联、匈牙利、捷克,德国、英国、意大利、法国、加拿大及北美,近年来已传入我省唐、秦两市及承德部分地区,发生面积57000余亩,成灾面积16000余亩。为害杨柳科植物,据文献记载,也为害桦树,是杨树的毁灭性害虫。幼虫在韧皮部中环绕树干蛀道为害,由于切断了树木的输导组织,轻者造成枝梢干枯,重者能使树木死亡。成虫不善飞行,主要通过苗木运输,使其从一个地区传入另一个地区,是我省重点检疫害虫。
Cryptorrhynchus lapathi L. is widely distributed in Northeast China and Shaanxi Province and distributed abroad in Japan, North Korea, the Soviet Union, Hungary, the Czech Republic, Germany, the United Kingdom, Italy, France, Canada and North America. In recent years, Chengde and parts of the city, an area of 57000 acres, disaster area of more than 16000 acres. Willow flora damage, according to the literature, but also harm the birch, poplar devastating pests. Larvae in the phloem around the trunk tunnel damage, due to cut off the organization of the trees, the light caused by the shoots dry, heavy trees can die. Adults flying poorly, mainly through the seedling transport, so that from one area into another area, is the focus of our province quarantine pests.