How to Manage Pests

Pests in Gardens and Landscapes

Pest identification and confirmation—Phytophthora crown rot

Phytophthora crown rot can be distinguished from other diseases by the appearance of crown tissue discoloration and decay. The decay usually starts at one point on the crown and spreads around the crown until the entire plant is girdled. The roots may remain healthy. If the diseased crown is sliced open, the affected area appears water soaked and uniformly brown; the discoloration is not confined to the vascular tissue.

Brown discoloration of crown tissue
Brown discoloration of crown tissue

Statewide IPM Program, Agriculture and Natural Resources, University of California
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