Prune your infected cherry tree during the growing season when it’s easier to identify the cankers. The bark should not be injured unnecessarily, since the fungus may enter through wounds resulting from injuries. Cytospora canker is a warm-season (summer) disease with peak fungal growth occurring just above 90 o F. Canker growth potential is highest when temperatures are high and prune tree growth activity is low (July-September). Botryosphaeria species are known causal organisms for dieback and cankers in most trees and shrubs. Colorado blue spruce trees are no longer recommended for planting in Maryland. CHESTNUT (Castanea) -- chestnut "blight", Cytospora canker, decay, Endothia canker, leafspot, shoestring rootrot, shothole leafspot, twig canker, Verticillium wilt. Fungi in Botryosphaeria genus are typically opportunistic pathogens; they will attack trees that are stressed due to biotic and abiotic conditions. Tree Canker Treatment. Season: Cytospora canker thrives in the summer when temperatures are above 90 degrees. Since no stone fruit tree is immune and fungicide treatments alone are not effective, control efforts must be aimed at reducing tree injuries where infection could begin. Management. How to control Cytospora Canker. CHESTNUT "BLIGHT" is a trunk canker caused by the fungus Endothia parasitica. There is no known chemical control for Cytospora. Due to climate change, summers are too hot and humid as well as too warm in the winter. Management. Treatment: There is no chemical control for Cytospora canker. Cytospora canker is most common on trees over fifteen years old, but may occur on younger trees as well. Control infection by limiting tree stress. Plant tree species that are resistant to the fungus. Other susceptible spruces include black, Norway, Oriental, and white. The Cytospora canker doesn't attack healthy undamaged bark, so prevent mechanical injuries to roots, trunk and limbs and reduce insect damage. Botryosphaeria Canker. Fungicides are not very effective against the Cytospora canker, so prevention is key to controlling the disease. Managing Cytospora canker involves total orchard management. Select a site well away from old cytospora-infected trees. Planning a New Orchard. There are no universally registered chemicals for the treatment of cankers. Cytospora or Leucostoma canker is one of the most damaging diseases of Colorado blue spruce, Picea pungens, in the landscape. Control of Cytospora canker requires that all diseased branches be cut back to the nearest living laterals or to the trunk of affected trees.
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