STUDIES OF WESTERN TREE RUSTS: VI. THE AECIAL HOST RANGES OF MELAMPSORA ALBERTENSIS, M. MEDUSAE, AND M. OCCIDENTALIS

摘要

Results from controlled inoculation experiments show that conifers of six genera (Abies, Larix, Picea, Pinus, Psendotsuga, andTsuga) are susceptible to the poplar (Populus) rusts of western Canada. Twenty-one new host records are established. It is suggested thatMelampsora albertensisArth. be reduced to synonymy withM. medusaeThuuml;m., because they appear to be indistinguishable from each other in morphology, life history, host range, and host reaction.