How to Manage Pests

Pests in Gardens and Landscapes

Botrytis rot (Gray mold)—Botrytis cinerea

The fungus that causes gray mold invades flower bracts that have been damaged by insects, snails or slugs, frost, or other factors. Infected bracts turn brown on the outside. On the inner surface of the bracts the characteristic gray growth of B. cinerea develops.

Solutions

The fungus survives on decaying organic matter. Botrytis rot is most common during rainy weather. Plant in well-drained areas. Remove infected plant parts and protect plant buds from damage caused by invertebrates. When storing chokes, remove infected chokes immediately.

Gray growth of B. cinerea  on lettuce leaf
Gray growth of B. cinerea on lettuce leaf


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/VEGES/DISEASES/artigraymold.html revised: April 25, 2014. Contact webmaster.