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First report of the white pine blister rust fungus, Cronartium ribicola, on Pedicularis bracteosa


Zambino, P. J.; Richardson, B. A.; McDonald, G. I. 2007. First report of the white pine blister rust fungus, Cronartium ribicola, on Pedicularis bracteosa. USDA Forest Service, Rocky Mountain Research Station, Moscow, ID 83843. Plant Disease. 91:467.

Until recently, Cronartium ribicola J.C. Fisch. was thought to utilize only Ribes spp. (Grossulariaceae) as telial hosts in North America. During 2004, Pedicularis racemosa Dougl. ex Benth. and Castilleja miniata Dougl. (Orobanchaceae) were proven as natural telial hosts at a subalpine site (48.634109°N, 116.570817°W, elevation 1,800 m) near Roman Nose Lake, ID, where whitebark pine (Pinus albicaulis Engelm.) and western white pine (Pinus monticola Dougl. ex D. Don) are aecial hosts, and Pedicularis, Castilleja, and Ribes spp. are common herbs/shrubs (2). During August 2006, teliospore columns typical of C. ribicola or the morphologically indistinguishable (2) C. coleosporioides J.C. Arthur were found on two Pedicularis bracteosa Benth. plants at this site, within 3 m of a large, sporulating canker on whitebark pine.

Keywords: pine blister rust fungus, Cronartium ribicola, Ribes spp., Grossulariaceae


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Title: RMRS Other Publications: First report of the white pine blister rust fungus, Cronartium ribicola, on Pedicularis bracteosa
Electronic Publish Date: August 28, 2007
Last Update:
August 28, 2007

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