Initial Characterization of a New Strain ofCronartium ribicolafrom the Cascade Mountains of Oregon

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Abstract
Inoculation of 20 families of Pinus monticola with 2 inoculum types of C. ribicola demonstrated significant variation in virulence. Compared with wild-type inoculum from Oregon, a new strain (Champion Mine) increased the incubation period of the rust, increased rust intensity, reduced the proportion of seedlings shedding all infected needles within 1 yr of inoculation, reduced the proportion of seedlings showing retarded canker appearance, increased the proportion of seedlings with stunted leaders, reduced the period from inoculation to mortality, and reduced the proportion of trees healthy 2 yr after inoculation.

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