2007年入春以来,浙江省淳安县山核桃产区瑶山、临岐、屏门、威坪等乡镇不同程度发生山核桃干腐病,发病程度为有史以来最严重的一次,个别地区株发病率达80%~100%。受此病为害最重的是15~20年左右刚投产的山核桃树,有的整株枯死。山核桃是淳安县主导产业,全县总种植面积达20万亩( Since the spring of 2007, the occurrence of dry rot of pecan trees to varying degrees in villages and towns such as Yaoshan, Linqi, Pingmen and Weiping in the pecan-producing areas of Chunan County, Zhejiang Province, with the most serious incidence in history, has been found in some areas The incidence rate of 80% to 100%. Hardest hit by the disease is about 15 to 20 years just put into operation the pecan tree, and some whole plants died. Hickory is the leading industry in Chun County, the county total planting area of ​​200000 acres (