澳大利亚棉花黄萎病菌致病性鉴定研究

 在温室人工接种鉴定了澳大利亚16个棉花种植地区30个棉花黄萎病菌株的致病性.结果表明:根据人工接种5个棉花品种的抗感反应和病情指数,30个供试菌株划分为4种致病类型.致病类型I(3个菌株)具有较强的致病能力,致病类型Ⅳ(5个菌株)的致病能力较弱.致病类型Ⅱ(12个菌株)和致病类型Ⅲ(10个菌株)的致病能力中等,为澳大利亚棉花种植地区的主要菌系类型.

Virulence and Distribution of Australian Strains of Verticillium dahliae of Cotton

Virulence of 30 isolates of Verticillium dahliae from 16 Australian cotton growing areas was identified by artificial inoculation in glasshouse. The results showed that all isolates were classified into 4 virulence groups (VGs) based on the average severity index and reaction on 5 cotton cultivars, The strain of VG 1(3 isolates) posses strong virulence whereas the strain of VG 4(5 isolates) posses weak virulence. VG 2(12 isolates) and VG 3(10 isolates) were the major pathogenic strains in Australia cotton growing areas and show middle level virulence.