贵州首次发现由星孢菌引起的云南樟枯梢病

First Record of the Tip Blight Disease of Cinnamomum glanduliferum Caused by Asteroconium sp.in Guizhou Province

本文报道了云南樟上的一种新病害。病菌主要侵染寄主枝条的梢部,在感病部位产生黄色疱状物,后期破裂露出其中的白色孢子堆,受害梢部最终萎缩枯死。依据病原菌形态特征的观测结果,将其鉴定为星孢菌Asteroconium sp.。该菌的形态特征及寄主范围与该属的模式种A.saccardoi Syd.比较接近,但亦有重要区别,主要是其分生孢子梗明显较粗短,且主要危害寄主植物的枝条梢部,未见危害叶片。这一新的病害种类在国内、国外均属首次报道。

In this paper,a new disease of Cinnamomum glanduliferum was reported.The causal agent mainly infect the branch tips of the host and produce yellow blisters on the infected sites,which later rupture and reveal the inside white mass spores,and the infected tips will dry and die finally.Based on the morphological characteristics,the causal agent was identified as Asteroconium sp,which was closely related to the type species of the same genus(i.e.,A.saccardoi Syd.)in terms of morphology and host range.However,the former differs obviously from the latter by having shorter and more robust conidiophores and mainly infecting the branch tips other than leaves.Such a new plant disease was first reported worldwide so far.