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
The most important factor in reducing the threat of Phytophthora rot is good water
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.
and discoloration of caneberries