How to Manage Pests

Pests in Gardens and Landscapes

Phytophthora root rot—Phytophthora spp.

Symptoms of Phytophthora are typical of many root diseases. Infected plants may be stunted. Leaves may turn dull green, yellow, red, or purplish. Small fruit may be produced. Darkened areas may develop in the bark around the crown and upper roots. Symptoms are more often pronounced on the previous season's growth.


The most important factor in reducing the threat of Phytophthora rot is good water management. Avoid repeated and prolonged flooding of soil. Remove infected plants and provide good drainage. If using sprinklers, position nozzles to avoid water runoff down trunks. Some varieties may be resistant.

For more information, see the Phytophthora Root and Crown Rot Pest Note.

Stunting and discoloration of caneberries
Stunting and discoloration of caneberries

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

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