Race of Cronartium ribicola Virulent to Major Gene Resistance in Sugar Pine. B. B. Kinloch, Geneticist, Pacific Southwest Forest and Range Experiment Station, USDA Forest Service, Berkeley, CA 94701. M. Comstock, Biological Technician, Pacific Southwest Forest and Range Experiment Station, USDA Forest Service, Berkeley, CA 94701. Plant Dis. 65:604-605. . This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1981. DOI: 10.1094/PD-65-604.

Differential foliar and bark reactions to two different sources of inoculum on sugar pine seedlings of known genotypes confirmed the existence of a race of the white pine blister rust pathogen virulent to major gene resistance.

Keyword(s): Pinus lambertiana.