西瓜枯萎病菌分离及致病力测定

对采自我国不同地区的西瓜枯萎病病株,进行了病原菌分离鉴定和致病性测定。结果表明：西瓜枯萎病病原菌是尖孢镰刀菌,对西瓜幼苗的平均病株率为72.8%;分离到的茄镰刀菌和半裸镰刀菌对西瓜幼苗也有一定的致病力,造成西瓜幼苗下胚轴基部水浸状腐烂,平均病株率分别为18.1%和20.0%。尖孢镰刀菌不同菌株的致病力也存在差异,除来自海南的菌株外,来自其他各地区的菌株平均病株率均〉70%;只有采自海南的菌株中出现了对西瓜幼苗没有致病力的菌株,海南所有菌株的平均病株率仅为33%。2010年研究结果显示,来自海南的菌株与来自其他地区的菌株之间存在致病力差异。

Isolation and Pathogenicity Determination of Watermelon Wilt

Watermelon wilt pathogens were isolated from diseased watermelon plants in China,and the pathogenicity was determined.The results showed that the pathogen was Fusarium oxysporum,and the average disease incidence rate was 72.8%.F.solani and F.semitectum were also isolated,which could develop light-colored,water-soaked areas on the base of hypocotyl,with the disease incidence rate of 18.1% and 20.0%,respectively.The pathogenicity of different strains of F.oxysporum was different.There was difference in the pathogenicity of different isolates of F.oxysporum.The average disease incidence rate was above 70%,excep for isolates from Hainan with the disease incidence rate of 33%.The results above showed that the pathogenicity of isolates from Hainan was different from those from other regions.