Azalea Leaf Gall: Fungal Disease Management

Azalea Leaf Gall: Fungal Disease Management

Green, bulbous growths on azalea leaves (and previously on weigela) are azalea/camellia leaf gall (Exobasidium vaccinii), a fungal disease. Galls are fleshy now, will harden and turn black.

Current Control

• Hand-pick all galls; bag and trash (do not compost).
• Rake and remove all fallen leaves.
• Severely prune if galls are only on tips.

Prevention for Next Spring

• Apply fungicide (Daconil or similar) at bud break.
• Repeat per label through spring.
• Improve air circulation; avoid overhead watering.

Galls don't kill plants but reduce vigor and aesthetics. Annual sanitation and spring spray minimize recurrence.