Vegetable Diseases

What's wrong with my tomato plant, you ask? Look at photos of common tomato problems and learn how to manage common tomato diseases and pests in a home garden.

In a home garden, leaf spots on tomato plants may be caused by Bacterial Spot or Bacterial Speck. Here we describe the two diseases and how to manage them.

Reasons why the leaves of vegetable seedlings curl

Late blight is the plant disease that caused the Irish Potato Famine in the 1840s. This water mold disease is potentially destructive to tomatoes and potatoes that are grown in Maryland, but it rarely occurs here.

Common Pepper Disease

Specific virus diseases are difficult to distinguish and produce a wide range of symptoms including stunted, slow-growing plants, twisted, crinkled, cupped, or deformed leaves, and leaf discoloration (yellow mottling and mosaic patterns, ringspots, and dark-green banding).

Powdery mildew is a common fungal disease that grows as a white powdery coating over the surfaces of leaves. It has a wide host range.

Symptoms of downy mildew include tan to dull yellow angular lesions (spots) that enlarge.

Septoria leaf spot starts on lower leaves of tomatoes as small, circular gray lesions (spots) with dark borders.