Variation in the Susceptibility of Lodgepole Pine Provenances to Sirococcus Shoot Blight

Sirococcusstrobilinus Preuss. was identified as the cause of a shoot blight of lodgepole pine (Pinuscontorta Dougl. ex Loud.) seedlings grown in a nursery in central British Columbia. Marked variation in susceptibility to this fungus was noted among the 153 provenances representing the entire range of lodgepole pine. Genetic variation in host susceptibility is inferred.