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从棉田采集多种(包括10科20余种)不表现症状的杂草根部,分离得丝核菌属(Rhizoctonia)真菌多株。用这些菌种在灭菌土壤接种棉苗,几乎全部可以在棉苗上致病,只是症状一般轻于从棉株上分离的丝核菌系。从形态鉴定看出,除狗尾草(Setaria-Viridis)和画眉草(Eragrostis cilianesis)上的菌系以外,所分出的绝大多数菌株都属于立枯丝核菌(Rhizoctonia solani)这个种,与棉花立枯病菌同属一个种。结果证明,以分布普遍、腐生能力极强,寄主范围广的立枯丝核菌有多种无症寄主。这种现象对于了解立枯菌的生态和防治都是很关重要的。
A great variety of strains of Rhizoctonia fungi were isolated from cotton weeds, which contained many species (including more than 20 species of 10 families) that did not show symptoms. Inoculation of cotton seedlings with these strains on sterilized soil can almost all cause disease on cotton seedlings, except that the symptoms are generally lower than those of Rhizoctonia isolated from cotton plants. From the morphological identification, most of the strains isolated except Setaria-Viridis and Eragrostis cilianesis belong to the species Rhizoctonia solani, Rhizoctonia both belong to one species. The results show that there is a wide range of distribution, strong saprophytic host Rhizoctonia host a wide range of host disease-free host. This phenomenon is very important for understanding the ecology and prevention of Rhizoctonia.