板栗新病害褐缘叶枯病及病原鉴定

A New Chestnut Disease—Brown Margin Leaf Blight and the Pathogen Identification

板栗（Castanea mollissima）在山东省是一重要的干果树种。自2004年起,山东泰安、济南、潍坊、临沂等地相继发生一种新的叶部病害,板栗感病后,叶片上产生褐色的斑点,随后病斑迅速扩大,呈不规则大面积干枯,9月中、下旬开始大量落叶,10月中、

A new leaf disease occurs in chestnut-producing areas of Tai＇an and Linyi in Shandong Province.Brown spots of 2-3 mm were formed on the infected leaves at initial stage.With the rapid expansion of lesions,the center of spots turned yellow cinnamon and had dark brown on edge.The diseased leaves showed irregular dry rot in a large area at the same time,which seriously influenced the tree vigor and yield.This disease was identified as a new leaf disease with the pathogen morphology and molecular biological characters,named as brown margin leaf blight.The isolate BY1 was found to be a kind of pathogenic strain of Phomopsis castaneae-mollissimae by pathogenicity test.