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Verticillium wilt is a systemic fungus disease that grows inside the trees vascular system. However, it is not an aggressive pathogen, and is less serious than some other vascular wilt diseases. Infected trees may survive many years after infection. Increasing the health of the infected plant will sometimes allow the plant to seal the diseased areas beneath a layer of thick sapwood. Verticillium attacks a wide range of woody plants and is common among plantings of ornamental trees and shrubs. This disease is frequently misdiagnosed.