Notes on Raspberry Diseases: Orange rust of blackberry
Infected plants produce weak, spindly shoot growth with yellow misshapen leaves in the spring. Leaves on these shoots develop bright orange pustules on the lower surface. This disease only occurs on blackberries, black raspberries and purple raspberries.
Orange rust on blackberry leaf
Unlike most fungus diseases, orange rust is systemic in the plant.
To prevent spread of the disease, dig out and destroy infected plants early in the spring before pustules break open.
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