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据我们1979年7月初踏查及11月中旬协同中国科学院林土所、东北林学院和西北林学院的三位林业昆虫专家,在凤县凤州地区调查,发现了对杨树具有很大危害性的一种害虫——杨干象鼻虫,又叫杨干白尾象鼻虫。一、分布情况杨于象鼻虫国内最初在东北发现,且已酿成严重灾害,据1975年调查,已由1973年的31个市、县扩大到39个市、县。据了解,过去在我区乃至全省尚未发现此虫危害,但现已证实,在凤州公社龙口大队范围内(包括凤州林场苗圃)确有分布(从林木
According to our investigation in early July 1979 and mid-November in collaboration with the Chinese Academy of Forestry Institute of Forestry, Northeast Forestry College and Northwest Forestry College, three forestry insect experts in Feng County Fengzhou area survey found a great risk to poplar A pest - Yang dry weevil, also called Yang dry white tail weevil. I. Distribution Yang Weevil was first discovered in Northeast China and has caused serious disasters in China. According to the survey in 1975, it has been expanded from 31 cities and counties in 1973 to 39 cities and counties. It is understood that in the past in our area and the province has not yet found this pest damage, but has now confirmed that in Fengzhou commune Longkou brigade (including the Fenghuang forest nursery) is indeed distributed (from the trees