Pest Alert: Bot Canker in Landscape Plants
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We have been seeing lots of Bot canker in landscape plants. Botryosphaeria is a fungus that causes a canker (infected wound) in oak, arborvitae, cherry laurel, Leyland cypress, and many other trees and shrubs. The fungus infects wounds on plants and kills the branch. Wounds can be caused by pruning, storm damage, cold damage, or excessive wetness.
There is no real treatment for the disease. Try to prevent damage to trees. Keep dwarf trees and shrubs as open as possible so that they will dry out after rain. Prune to allow air flow in plants. Clean out leaves from the insides of shrubs. Do not bury plants too deep in mulch. Prune out infected branches and fertilize affected trees if needed.