Pest Control Library: Bacterial Spot

Articles→Pest Control Library

By National Gardening Association Editors

Photo by gardengus

This disease is found mainly in eastern parts of North America where it affects tomatoes and peppers. Small, dark, corky, raised spots with slightly sunken centers appear on green fruits. Rot organisms may enter at the spots and decay the fruit. Infected blossoms drop; small, dark spots form on leaves, which yellow and drop. This defoliation weakens plants and exposes developing fruits to sunscald. Very warm, wet weather encourages the development of the disease. The fungus overwinters in plant residues in the soil.

Prevention and Control

Use a 3- to 4-year crop rotation. Destroy volunteer tomato and pepper plants and infected fruits. Purchase only certified disease-free transplants. Keep plants well watered and fertilized. Leave plenty of space between plants and support vines to ensure good air circulation. To prevent the disease from spreading, avoid overhead watering and working among plants when they are wet. Apply a fixed copper fungicide as directed by the product label, or spray aerated compost tea every 7 to 10 days while the weather is favorable for disease spread.

Photo courtesy of Howard F. Schwartz, Colorado State University,

Together with Victory Seed Company:
Victory Seed Company Logo Victory Seed Company has all the seeds you want for your best garden in 2024.

For 25 years, the family-owned Victory Seed Company has provided the highest quality vegetable, herb and flower seeds to families across the country. We are passionate about providing you the best seeds available that give excellent germination, robust plants, and the harvest you want. With a catalog of over a thousand varieties, we have everything, and our prices are the kinds that we'd want to pay. We have hundreds of yesterday's heirloom vegetables, as well as today's award winning hybrid selections. Get to know us by visiting our website and browsing through our online vegetable seed catalog.

This article is a part of our Pest Control Library.
This article is a part of our Pest Control Library.
Member Login:

( No account? Join now! )

Today's site banner is by mcash70 and is called "Queen Ann's Lace"

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.