How to Manage Pests

Pests in Gardens and Landscapes

Bacterial leafspot of cole crops—Pseudomonas syringae pv. maculicola

Infections of bacterial leafspot start as small, dark specks on leaves. As the disease develops, numerous water-soaked leafspots appear. Leafspots remain small (0.125 inch in diameter). Older leafspots turn tan and may or may not have a purple border around them. Leafspots are visible from both the top and bottom sides of leaves.

Solutions

Bacterial leafspot occurs primarily in cooler regions such as in coastal areas. The pathogen that causes the disease is seedborne and is splashed from plant to plant by rain and sprinkler irrigation. Plant clean seed and disease-free transplants. Avoid sprinkler irrigation. Remove and discard of any diseased plants.

Bacterial leafspot on cabbage
Bacterial leafspot on cauliflower


Statewide IPM Program, Agriculture and Natural Resources, University of California
All contents copyright © 2017 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   Contact webmaster.