Types of Garden Diseases and Disorders

Fight off common garden diseases with this guide for identifying problems before they worsen.

Related To:

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2011, Dorling Kindersley Limited

©2012, Dorling Kindersley Limited

Botrytis

A fluffy, gray mold (or whitish spots on tomatoes) that enters plants through wounds or flowers. Remove dead and infected plant material to reduce risk of infection. Find out more about common plant diseases here. And follow these tips to prevent plant diseases.

Types of Garden Diseases and Disorders

Just like people, strong, healthy plants are susceptible to disease and infection. Here's how to get to the root of common garden problems. The coral spot pictured here is commonly seen on dead twigs of trees and shrubs. In damp weather, small pink or red eruptions appear on infected bark. Cut out diseased areas promptly.

Potato and Tomato Blight

Brown patches on leaves, fruits, and tubers, caused by a fungus that thrives in warm, wet weather. Grow resistant varieties or spray with copper-based fungicide.

Sclerotinia

Fungus that causes brown, slimy rot with fluffy, white growth, predominantly on stems and fruits of various vegetables. Remove and burn or discard affected plants.

Magnesium Deficiency

Older leaves of various vegetables show yellowing between veins, especially in acidic soil or after heavy rains. Apply Epsom salts to the soil or as a foliar spray.

Clubroot

This soil-borne slime mold infects brassicas, causing swollen roots, wilting foliage, and even death. Ensure good drainage, add lime to acidic soil, and choose resistant varieties.

Blossom End Rot

Dry conditions affect calcium uptake, which causes sunken, black patches at the tips of tomatoes and sweet peppers. Correct with adequate, regular watering.

Powdery Mildew

A wide range of crops are affected by these fungi, causing powdery white growth on leaves in dry soil conditions. Water the soil well, but not over the leaves.

Onion White Rot

This fungus persists in the soil for up to seven years and causes fluffy white growth on bulbs and roots and yellowing of leaves. Remove and burn infected plants.

Rust

Orange or brown spots appear on the leaves and stems of various vegetable crops, particularly in damp weather. Remove infected leaves and grow resistant varieties.

Next Up

Garden Plants and Flowers

Learn how to discover which plants underscore and help define a specific garden design style.

Avoiding Pests and Disease in the Garden

Paul James reveals his secrets for controlling pest and disease problems.

Tips for Watering Lawns and Gardens

Without adequate water, plants will suffer and eventually die. Supplies can run short as rapidly growing plants draw up moisture from the soil. It's important to know what to water and how.

Plant a Rose and Perennial Garden

Create a contemporary display using disease-resistant roses and pretty perennials for a modern mix of flowers and foliage.

What to Plant in High- and Low-Maintenance Gardens

Choose plants for a garden design that will suit your lifestyle.

Plant and Grow Poinsettias in Your Garden

These tropical beauties can flourish outdoors in warm-winter areas.

How to Fertilize Your Lawn and Garden

Learn how adding fertilizer can be beneficial, especially for fruits, veggies and container plants. Fertilizers can also help kick-start growth after planting and reinvigorate plants that have been pruned hard.

Watering Lawns and Gardens

Thorough, careful watering encourages deep, drought-resistant roots in your lawn and garden. Follow the steps below to ensure best results.