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Vegetable Diseases

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Updated: January 3, 2024

Key to Common Problems of Cucumbers

Look at photos of common cucumber plant problems and learn how to manage common cucumber diseases and pests in a home garden.
misshapen cucumber due to poor pollination and downy mildew disease
Updated: July 28, 2023

Key to Common Problems of Tomatoes

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.
tomato plant with spots on the leaves and wilted leaves
Updated: April 5, 2023

Key to Common Problems of Squash

Having problems growing squash plants in your garden? Look at photos of the most common problems of squash and find tips on how to manage a variety of squash diseases, pests, and disorders. 
fuzzy mold on a squash flower
Updated: February 24, 2023

IPM - Prevent, Identify, and Manage Plant Problems

How to ID, prevent, and manage plant problems in Maryland using IPM
no lawn landscape
Updated: July 16, 2024

Leaf Curling on Vegetables

Reasons why the leaves of vegetable seedlings curl
Pepper leaves distorted from aphid damage
Updated: June 6, 2024

Septoria Leaf Spot of Tomatoes

Septoria leaf spot starts on lower leaves of tomatoes as small, circular gray lesions (spots) with dark borders.
closeup of tomato plant leaves with septoria leaf spots
Updated: January 23, 2024

Fungal and Bacterial Diseases of Vegetables

Foliar leaf spots, which include brown, yellow, or black spots, are common on many vegetable plants. Experience and regular monitoring will alert gardeners as to the seriousness of the problem.
early blight leaf lesion on tomato plant
Updated: August 14, 2023

Downy Mildew of Vegetables

Symptoms of downy mildew include tan to dull yellow angular lesions (spots) that enlarge.
yellow and brown spots on cucumber leaves
Updated: July 14, 2023

Anthracnose Disease of Vegetables

Soft, sunken, dark spots on vegetables are a symptom of Anthracnose disease.
Anthracnose symptoms on bush bean pod
Updated: February 20, 2023

White Rot of Alliums in the Home Garden

White rot is a destructive disease of onions and garlic.
white rot diseased onion bulbs