Host Specialization ofHeterobasidion annosum

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Abstract
A total of 30 isolates of H. annosum (Fomes annosus) from Pinus ponderosa and Abies concolor were inoculated into seedlings of both hosts in 2 greenhouse experiments. Two-way analyses of variance showed significant differential interaction between isolate groups and host species. Isolates from one host were more virulent on that host than isolates from the other host. Mortality data and tissue colonization patterns parallel observations of H. annosum on the 2 hosts in nature.