宁夏小麦赤霉病菌以分生孢子在高粱、玉米、水稻等寄主作物残体上越冬,第二年形成子囊壳。小麦抽穗前后,子囊壳成熟形成子囊孢子,传播至正在开花的小麦穗部引起侵染。不同前作麦田扬花期穗部周围子囊孢子数的差异达到极显著标准;前作为高粱或玉米的田块,极显著高于小麦连作田。寄主残体密度和带菌率高低与该病发生轻重的相关性显著或极显著,可建立直线回归方程。 Ningxia wheat scab pathogen conidia in sorghum, corn, rice and other host crops on the winter, the second year to form ascus shell. Before and after the heading of wheat, the ascapsulation of the ascapsulate formed ascospores and spread to the spikes of inflorescence wheat. The differences in the numbers of ascospores around the ear of anthesis at the flowering stage reached the extremely significant difference in the previous crop. The field before as the sorghum or corn was significantly higher than that of the wheat cropping field. The host residue density and carrier level and the severity of the disease was significant or very significant correlation can be established linear regression equation.