sudden oak death

A disease caused by the oomycete Phytophthora ramorum that affects oak trees and certain other woody plants and is characterized by oozing cankers on the trunk, browning of foliage, shoot dieback, and often death of the plant.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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