A common cause of wilting in red raspberries is Phytophthora root rot. It mostly occurs in heavy soils, where standing water occurs, or where plants have been heavily mulched.
Canes suddenly wilt and turn brown at the onset of warm temperatures, usually in June.
Field diagnosis involves removing the outer layer of epidermis on the roots and canes. Phytophthora infection usually is expressed as a chocolate-brown coloration of roots with a sharp transition to white, uninfected wood within the roots or crown.
Black raspberries are susceptible to verticillium wilt. It is most common when raspberries are planted after potatoes, tomatoes or other solanaceous crops. Canes acquire a bluish cast during wilting. Verify diagnosis with a laboratory test.
Crown gall can damage canes at the root level, causing wilting. Galls are visible at the soil line. This bacteria infects canes through wounds.
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This is a part of The Berry Diagnostic Tool - a companion to the NRAES Production Guides for Strawberries, Raspberries and Blueberries