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采用人工土壤接种高粱丝黑穗病菌方法，用中国高粱丝黑穗病菌不同生理小种对美国高粱丝黑穗病菌小种进行了致病力测定。在Ｔｘ７０７８，ＳＡ２８１，Ｔｘ４１４，ＴＡＭ２５７１和ＡＴｘ６２２等一套鉴别寄主上的测定结果，我国高粱丝黑穗病菌的３个生理小种与美国的４个生理小种对寄主致病力完全不同。中国和美国的生理小种不属于同群。应根据我国高粱丝黑穗病菌小种对寄主致病力反应，有效地引进外来抗性资源用于抗病育种。
The artificial soil was used to inoculate the sorghum head smut. The pathogenicity of the sorghum head smut of American sorghum was tested with different physiological races of Chinese sorghum head smut. In the determination of Tx7078, SA281, Tx414, TAM2571, and ATx622, the pathogenicity of three physiological races of Sorghum smithii and four physiological races in the United States were completely different. Physiological races of China and the United States do not belong to the same group. Should be based on our sorghum head smut bacteria host virulence response to the effective introduction of foreign resistant resources for disease-resistant breeding.