How to Manage Pests

Pests in Gardens and Landscapes

Leaf gall—Exobasidium vaccinii

Leaves infected with the leaf gall fungus are partly or all thickened, distorted, and crisp. White or pinkish spores cover the infected tissue. The fungus that causes leaf gall spreads by air only during wet weather.


Avoid overhead watering. Prune only when dry. Vigorous plants can tolerate extensive leaf galling. Handpick or prune out galls. Rake and dispose of fallen leaves. Provide good air circulation. If symptoms are on azalea, thin crowded azaleas and consider removing some plants if nearby plants are closely spaced.

Leaf gall on manzanitaLeaf gall on manzanita

Leaf and flower gall on azalea
Leaf and flower gall on azalea

Statewide IPM Program, Agriculture and Natural Resources, University of California
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