This disease can also affect Norway spruce (and less frequently other spruces) as well as Douglas-fir and balsam fir. Cytospora canker is a common disease on spruce trees that are stressed by drought, winter injury or other factors. Cytospora rarely kills spruce trees, but can badly deform them and damage the look of the tree. Trees that are 15 years old or older and are at least 20 feet high most typically show symptoms of this disease. Cytospora canker is one of the most common fungal diseases of Colorado blue spruce. Cytospora canker is caused by various species of the fungus Cytospora (sexual genera of Valsa and Leucostoma). Cankers kill random branches throughout the tree canopy. (Fig. Prune out and destroy infected branches during dry weather. 4.) During the summer of 1929 an even more serious manifestation of Cytospora canker on apple trees came under the writers' observation These pathogens affect many species of shrubs and trees in Colorado, including aspen, cottonwood, lombardy and other poplars, apple, cherry, peach, plum, birch, willow, honeylocust, mountain ash, silver maple, spruce, and Siberian elm. Sept. 1,1931 A Cytospora Canker of Apple Trees 433 in the 1928 growing season or during subsequent years, and eventually all of the dead areas healed over completely. In peach production systems, three Cytospora species have been reported as the casual agents of Cytospora canker. What is Cytospora canker? Cytospora species have been reported on at least sixty genera of hardwood and conifer trees and pose a serious threat to tree fruit crops (Grove 1935).
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