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Abstract
White pine blister rust disease, caused by the introduced pathogen
Cronartium ribicola, has severely disrupted five-needled pine ecosystems in North America. A 100-year effort to manage this disease was predicated in part on the premise that the pathogen utilizes only species of
Ribes (
Grossulariaceae) as alternate hosts on this continent. The current study presents the first conclusive demonstration that some species in the family
Orobanchaceae (
Pedicularis racemosa and
Castilleja miniata) are functioning as alternate hosts in a natural ecosystem of North America. This finding has implications for improving our understanding of epidemiology, pathogen adaptation and host-pathogen interactions within white pine blister rust.
Keywords
Cronartium ribicola,
Pedicularis racemosa,
Castilleja miniata,
Ribes,
Pinus monticola,
Pinus albicaulis,
plant diseases,
epidemiology,
pathogens,
hosts,
adaptation,
Idaho
Citation
McDonald, Geral I.; Richardson, Bryce A.; Zambino, Paul J.; Klopfenstein, Ned B.; Kim, Mee-Sook. 2006. Pedicularis and Castilleja are natural hosts of Cronartium ribicola in North America: A first report. Forest Pathology. 36(2): 73-82.
