关键词: 玉米, 纹枯病菌, 致病力, 抗性, 西南地区

Abstract: In order to clarify the differences in the pathogenicity of maize sheath blight strain in southwest China, 33 strains of different groups of maize sheath blight strain were selected as the research object, and the pathogenicity of maize cultivar Chuandan 13 was identified by artificial inoculation at seedling stage and adult stage. The results showed that the virulence of different groups of Rhizoctonia on maize was significantly different, and the virulence of different strains in the same group was also different, moreover, the virulence of AG1-ⅠA was the strongest in these groups. The resistance of 23 varieties were identified by four strains of AG1-ⅠA、AG4-HGI、AG2-2ⅢB、WAG-Z. The resistance differences among varieties were obvious when AG1-ⅠA was used to identify the resistance of maize varieties, including 1 highly susceptible cultivar, accounting for 4.35%; 6 susceptible cultivars, accounting for 26.09%; 11 moderately resistant cultivars, accounting for 47.82%; 5 resistant cultivars, accounting for 21.74%; And no high resistant varieties. The resistance difference could not be identified when inoculated with the other groups since most of varieties were high resistance and individual was resistance.

Key words: maize, Rhizoctonia spp, pathogenicity, resistance, southwest China