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棉花黄萎病是由大丽轮枝菌(Verticilliumdahbiae)侵染引致的维管束病害,田间黄萎病株叶片呈现类似西瓜皮的典型症状,茎秆木质部变成褐色。现蕾后田间陆续出现病株,开花期达到发病盛期。试验证明,病菌通过根部入侵,随后扩展侵染棉株各个部位。关于棉花黄萎病叶内病菌侵染维管束的程度李正理(1980)已作了报道。但病菌在
Verticillium dahliae is a vascular bundle disease caused by Verticillium dahliae infection. Verticillium dahliae leaves show typical symptoms similar to watermelon peel and the xylem of stalk turns brown. After the emergence of buds in the field after the emergence of diseased plants, flowering period to reach its peak. Experiments show that the bacteria invade through the roots, then spread to infect various parts of the cotton plant. About the extent to which pathogenic bacteria in the leaves of cotton Verticillium wilt infected the vascular bundles Li Zhengli (1980) has reported. But the bacteria in