Prune out and destroy infected branches during dry weather. Check the cut surface of damaged limbs to ensure that all the disease has been removed. How to manage Cytospora canker in spruce trees Plant spruce trees on sites with moist, well-drained soil in full sun. You may not have heard of cytospora canker until after a tree in your backyard is infected. Signs and Symptoms of Tree Cankers . Check spruce trees once a year for cankers. The types of damage that leave the tree susceptible to infection include pruning wounds, flying debris from lawn mowers, string trimmer injuries, frost, fire and cat scratches. This is caused by the cytospora cankers fungus. Pruning during the growing season allows you to better identify branches with cankers. The disease is common on large mature trees. These trees are often removed and replaced. These diagnostic tools will guide you step-by-step through diagnosing a plant problem or identifying a weed or insect. Dark, raised, pimple-like, spore-producing structures form on infected branches. Because this canker disease usually occurs on a weakened host, the primary method of control is to prevent stress on the tree. P… Perhaps the easiest way to avoid Cytospora canker is to avoid planting Colorado blue spruce. Dead areas of bark appear, known as cankers. Now is a good time to prune out … Plant spruce trees on sites with moist, well-drained soil in full sun. The only direct action for disease reduction is pruning out diseased limbs. When the branches or trunks of affected trees are wet; spores exude from cankers onto the surface of the bark. Plant yours with lots of room and good air circulation. At its worst, cankers on the trunk of a tree can be in the process of girdling and subsequently killing the entire tree. Cankers will often appear as a swelling surrounding a sunken lesion on the bark of trunks and branches. Cytospora canker rarely kills spruce trees, but it can severely deform them. Infection by this fungal disease commonly starts in the lower limbs and gradually works up the tree limb by limb. Managing Cytospora canker involves total orchard management. Water them during dry periods and fertilize them annually to provide nutrients. Disease begins when the tree becomes stressed by insect feeding, snow or ice damage, drought or other factors. If you do plant blue spruce, allow adequate spacing between trees in new plantings. Extension is expanding its online education and resources to adapt to COVID-19 restrictions. Needles turn a dull yellowish-green then purple-brown. Take care not to wound trees susceptible to this disease. Use bleach to disinfect the pruners before and after each use. You may look to fungicidal sprays as a cytospora canker treatment, but these are not effective and are not recommended by experts. This is a fatal disease. Wounds, like those from weed whackers and saws, serve as entry points for the fungus. Over several years, symptoms of cytospora canker spread and upper branches brown and die. Cytospora canker disease generally attacks spruces, especially Colorado blue and Norway varieties, as well as peach trees, Douglas firs or hemlock trees. Sign up to get all the latest gardening tips! Cytospora. What is cytospora canker? Regents of the University of Minnesota. Prune out and destroy infected branches during dry weather. Managing Cytospora canker involves total orchard management. Read on for more information about symptoms of cytospora canker as well as cytospora canker treatment. Sign up for our newsletter. The term " canker" is used to describe a killed area or blister on the bark, a branch or the trunk of an infected tree.The Morton Arboretum describes it as a canker that is "usually oval to elongate, but can vary in size and shape." It attacks older trees, stressed trees and those with shallow roots or planted in inappropriate sites. 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