Restricted distribution of a virulent race of the white pine blister rust pathogen in the western United States

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Abstract
A race of Cronartiumribicola virulent to a major gene for resistance to blister rust in sugar pine appears to be limited to the site where first discovered on resistant genotypes in 1978. It was not detected in inocula surveyed extensively throughout a large part of the range of blister rust in the western United States and detected only rarely in inocula surrounding the discovery site. Nor was it found attacking resistant genotypes in other test plantings either nearby or remote from this site. Rate of spread of the virulent race from the discovery site was too slow to be measured during 6 years of observation. These results imply that major gene resistance may be usable for at least one rotation of improved planting stock, while other resistance mechanisms are being developed.

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