Sudden oak death is typically a tree disease caused by the pathogen Phytophthora ramorum, causing cankers on the trunk, dieback of the foliage, and often the death of the tree.
Death can occur with a sudden browning of the leaves, as with the red oaks, or over time with gradual leaf loss. P. ramorum infection in twigs can lead to shoot tip dieback and wilting. Shoot tip wilting, or flagging, can be useful in identifying trees that are infected but not showing bleeding symptoms.
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