00346naa a2200109 a 450000100080000000500110000800800410001910000200006024500890008026000090016977300580017818290692010-01-10       1944    bl ---       0--  u    #d1 aHARDISON, J. R.  aSpecialization of pathogenecity in Erysiphe graminis on wild and cultivated grasses.  c1944  tPhytopathology, St. Paulgv. 34, n. 1, p. 1-20, 1944.