European Pear Rust
In summer and early autumn this fungus first appears as bright orange spots on the upper leaf surface with corresponding brown, gall-like outgrowths developing on the corresponding underside of the leaf. In mainland Europe the fungus can also cause damaging perennial cankers (sunken lesions in the bark) on the stems. This fungus attacks both pears and junipers. In fact it needs both plants in order to complete its life cycle.
Cultural Control: Cut out affected areas if necessary. There is no chemical registered for the control of this disease.