Adjust catcher plates on mechanical harvesters to minimize wounding and subsequent infection. Fungicide application directed to base of primocanes to protect wounds. Check lower primocane buds for infection in the fall. Phytophthora Root Rot Soilborne fungus which can cause root and crown rot. Infection favored by saturated soil conditions.
Diseased plants have lack of feeder roots, poor vigor canes.
Interior of major roots and crown are brown to black. Damage seen as collapse of fruiting laterals, wilting primocanes with onset of hot weather. Reduced vigor and yield. Note areas in field where these symptoms are seen. Decline can be extreme during harvest.