This species causes a well-known and much studied disease on the horticultural "azaleas." Numerous (all?) cultivars are more or less susceptible ...

Entire leaves or parts deformed into very conspicuous, pale, fleshy, shapeless galls up to 3 cm across, eventually hymenium-clad and chalky white on the morphological underside.

- Nannfeldt, J.A.: (1981) Exobasidium, a taxonomic reassessment applied to the European species^©