小麦白粉病菌对国外引入的披碱草属植物的侵染

对采自我国和由美，加，日，捷，斯，阿（阿富汗）和前苏联引入了１８人种的披碱草，用我国小麦白粉病１１个生理小种的混合菌种进行接种，有１５个接种成功，用１４份发病披碱草上产生的白粉病菌分别回接小麦，也全部回拉成功，说明国外的披碱草和我国的一株具同源性，都属于我国小麦白粉病的寄主范围，具中间寄主传播病菌的潜力，对国外披碱草在疆域接壤的邻国间传播新小种等问题进行了讨论。

The Infection of Wheat Powdery Mildew to Elymus L. Introduced from Other Coutries

The resistance of eighteen Elymus species,grown in China and introduced from USA,Canada,Japan,Czech,etc to wheat powdery mildew was tested with a mixture of 11 Chinese mildew races in greenhouse.The result showed that 15 species were successfully inoculated by the mildew pathogen.The mildew spores produced on 14 diseased Elymus species plants were collected and inoculated back to the wheat plants.The inoculation was also successful.The infection indicated that Elymus belonged to the wheat mildew host category in China.They have the potential to transmit powdery mildew pathogens.The possibility of the Elymus species transmitting new races in contiguous areas between countries was discussed.