Spread of Heterobasidion annosum in Christmas Tree Plantations of the United States Pacific Northwest.

Abstract

ABSTRACT The population structure of Heterobasidion annosum in the Pacific Northwest (PNW) Christmas tree plantations was estimated at two spatial scales to assess the relative importance of primary and secondary infection, colonization, and spread of the pathogen. Ninety-three isolates from single trees in 27 discrete mortality pockets and 104 isolates… (More)
DOI: 10.1094/PHYTO-97-5-0551

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