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Red stele

Red stele is a fungus that thrives in cold and wet winter weather.

Also known as:
Lanarkshire disease (strawberries)

recognize red stele on strawberries
Red stele on the roots of the strawberry, photo: Liberato - CC BY 3.0

Red stele (Phytophthora fragariae). This fungus thrives in cold and damp winter weather. Strawberries grow poorly, leaves turn dull blue and the core of the root turns red. The fungus lives in the soil where it can survive for years at rest. Phytophthora fragariae var. rubi is the variety of the fungus that attacks raspberries.

Where to find

Control

Remove infested plants.

Prevention

Plant strawberries and raspberries in a different spot every few years. Also applies to raspberries.