Raspberry leaf rust is a common fungal disease of raspberries, causing damage to foliage but rarely greatly affecting yield. It is more common in wet and humid conditions.
Raised yellow/orange pustules appear on upper leaf surfaces, usually of lower leaves first.
Many tiny orange pustules begin to be produced on the lower leaf surface, often with small yellow spots on the corresponding upper surface. Heavy infection may cause early leaf drop.
Yellow/orange pustules are replaced black pustules of overwintering spores.
Raspberry leaf rust (sometimes called raspberry yellow rust) is caused by the fungus Phragmidium rubi-idaei.
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