玉米小斑病菌在 PDA 平面培养基上常出现菌落局变(saltation)。从局变区菌丝分离获得的局变菌株及其后代仍保持对玉米的致病力。多数局变菌株的致病力增强,并且到第5代时仍能保持第1代时的致病强度。局变菌株的致病力与产孢量没有相关性。培养基上菌落的生长速度与对玉米的致病力也没有相关性,但与产孢量有关。 S. Marcesters often exhibit saltation on PDA flat media. The mutant strain and its offspring obtained from the mycelial isolates from the virulent area still maintained virulence to maize. The virulence of most strains of strains increased virulence, and by the fifth generation can still maintain the virulence of the first generation. The virulent strains of virulence and spore no correlation. The growth rate of colonies on the medium was not related to the virulence of maize, but was related to the amount of sporulation.