The rust fungus Melampsora caprearum can affect the leaves of certain willow species (Salix caprea, S. cinerea, S. atro-cinerea and S. aurita). The leaf blade or veins become distorted with irregular thickened spots bearing orange-yellow urediniea of the rust.
Where the host trees are present.
Whenever the host trees are in leaf.
Widespread and fairly frequent in Britain.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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