用小麦白粉病菌11个生理小种的混合菌种,对新疆地区的小麦近缘植物的7个属22个种的47份材料进行接种,除6份免疫外,其余均接种成功.用其中6个属19个种的29份小麦近缘植物产生的白粉病菌,对小麦回接,参试的29份材料全部回接成功.小麦白粉病菌对小麦近缘植物的寄生像在小麦上一样,有明显的寄生专化性.感病的小麦近缘植物的78.0%对小麦白粉病菌的感病性,随生育期增长而急剧下降.文中并对小麦白粉病中间寄主的作用进行了讨论. 47 strains of 22 genera and 47 species of wheat relatives in Xinjiang were inoculated with mixed strains of 11 race of wheat powdery mildew, A total of 29 wheat germplasms from 19 species of wheat were successfully picked up and all the 29 materials returned to wheat were successfully connected.The wheat powdery mildew had similar parasitism to the wheat relatives on wheat, Significant parasitism of the susceptible wheat 78.0% of the susceptible strains of wheat powdery mildew, the sharp decline with the growth of growth period.In this paper, the role of intermediate host wheat powdery mildew were discussed.