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Xiuli Shen and Myeong-Je Cho

Sugar pine ( Pinus lambertiana Dougl.), a gymnosperm belonging to the family of Pinaceae prized for its economic and ecological value, is one of the most valuable softwood forest plant species in the western United States. Native to the region from

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Richard A. Sniezko, Andrew Bower, and Jude Danielson

Seedlings from 12 sugar pine (Pinus lambertiana Dougl.) and 13 western white pine (Pinus monticola Dougl.) families were planted at Happy Camp, Calif., in 1996. Assessment in Summer 1999 indicated moderate levels of white pine blister rust (Cronartium ribicola Fischer) infection. This paper focused on the species differences and showed that sugar pine had a higher incidence of stem infection (active and inactive cankers) and more stem infections per tree than western white pine. An unexpected result was the very high percentage of infections that were bark reactions (completely inactivated infections), despite the fact that only some of the families of both species were selected for this mechanism. Assessments in subsequent years will track the future performance of the two species and of the individual families.