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Old avocado tree with cracked, flaking bark from Phytophthora trunk canker and crown rot, caused by Phytophthora mengei (= Phytophthora citricola).

Cracked, flaking bark on basal trunk of old avocado tree infected with Phytophthora canker and collar rot. Fallbrook, San Diego Co. Credit: David Rosen — Credit: David Rosen

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