Young Douglas fir in British Columbia sustained damage from Phomopsis lokoyae Hahn during the winter of 1948–49. Damage in the form of annual stem and branch cankers, leader die-back, and stem girdling was confined to trees, or parts of trees, 4 in. in diameter or less. Fungus activity was confined to Douglas fir bark and cambium tissues for the single dormant season. Outbreaks of the fungus are recurrent in British Columbia, reaching epidemic proportions only at irregular intervals.