Botrytis, the same fungus that causes gray mold on fruit, can infect flowers and buds before they open, causing them to turn brown. It can also infect canes. These infections are problematic only under very wet conditions. If these tissues are placed in a plastic bag and kept warm and moist, the fungus will sporulate.

Fireblight bacteria can affect raspberries as well as other fruit crops. This bacteria causes the growing points (primocane tips and fruiting laterals) to quickly turn black and die. This is relatively rare in raspberries, but is observed occasionally.

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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