Azalea gall attacks certain rhododendrons and azaleas out of doors and is often seen on indoor pot-grown plants of Rhododendron simsii, the popular Indian azalea, obtained from florists.
Scientific name Exobasidium japonicum
Plants affected Rhododendrons, mainly azaleas
Main symptoms Galls (fleshy swellings) on leaves or flowers
Caused by Fungus
Timing Spring until autumn
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.