- Author: Belinda Messenger-Sikes
Published on: February 4, 2025

Boxwood dying from Phytophthora root rot. Photo by Jim Downer.
A well-watered plant that suddenly wilts or unexpectedly drops its leaves could be infected with the soil pathogen Phytophthora. The disease it causes, Phytophthora root and crown rot, can affect many plants, including ornamental trees and shrubs, fruit trees, and vegetables. Plants growing in water-logged or poorly draining soil are susceptible to Phytophthora infection, leading to aboveground symptoms like tip dieback, stem cankers, thinned canopies, and discolored foliage, or plant death.
To help you identify and manage this disease, UC IPM has recently updated the Pest Notes: Phytophthora Root and Crown...
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Tags: crown rot (0), disease (0), Downer (0), IPM (0), landscape (0), Perry (0), pest (0), pest management (0), Pest Notes (0), Phytophthora (0), root rot (0), rot (0), shrub (0), soil (0), Swain (0), tree (0), UC IPM (0), urban (0), water (0)
Focus Area Tags: Pest Management, Yard & Garden
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