How to Manage Pests

Pests in Gardens and Landscapes

Flower blight—Ovulinia azaleae

Flower blight causes small round to larger spots on flowers. Flowers collapse, become soft, and cling to leaves or stems. The fungus that causes flower blight is favored by cool, wet weather. Spores are spread by splashing water.


Remove and dispose of diseased blossoms. Remove debris from the base of plants or pots in order to reduce inoculum. Prune to improve air circulation and remove lower branches where infections first occur. Do not use overhead sprinklers. In rainy areas, applying a fungicide such as triforine prior to budbreak may help prevent this disease.

Flower blight on azalea
Flower blight on azalea

Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2014 The Regents of the University of California. All rights reserved.

For noncommercial purposes only, any Web site may link directly to this page. FOR ALL OTHER USES or more information, read Legal Notices. Unfortunately, we cannot provide individual solutions to specific pest problems. See our Home page, or in the U.S., contact your local Cooperative Extension office for assistance.

Agriculture and Natural Resources, University of California

Accessibility   /PMG/GARDEN/PLANTS/DISEASES/flowerblight.html revised: April 25, 2014. Contact webmaster.