Found on potato and tomato leaves as pale green spots, often beginning at leaf tips or edges. Click on a plant disease to be taken to a page full of useful information about how to identify it and prevent problems. Remove and destroy any affected plants as soon as possible to limit the spread of the virus. Galls can grow up to 5 inches in diameter and release thousands of spores as they rupture. A fungicide can be used and the leaves can be removed from the lower part of the plant to prevent spores from splashing up onto the foliage. While by no means the only plant pests of biosecurity concern, the National Priority Plant Pests serve to highlight the sort of threats Australia f… Repeat applications will likely need to be made. Click on a plant disease to be taken to a page full of useful information about how to identify it and prevent problems. Squash bug eggs are hatching into nymphs on the undersides of these leaves. A telltale sign of bacterial wilt is the sticky, white sap-like substance that oozes from snapped stems. Pest Identification Guides. Hornworms favor the leaves of tomato and pepper plants. Powdery mildew has formed on the leaves of this rudbeckia. It starts with one leaf wilting and spreads. Index of common pests and diseases that affect plants. Introducing "One Thing": A New Video Series, The Spruce Gardening & Plant Care Review Board, The Spruce Renovations and Repair Review Board. Because the hornworm is so large (about the size of a pinkie finger), the easiest way to get rid of it is to simply remove it from the plant and dispose of it. As adults, these pests damage plants by feeding on leaves, soft fruits, shoots and blossoms. Whiteflies feed off plants by sucking the plant's juices. The lower leaves of this tomato plant are infected with leaf spot. The tomato hornworm is the larval stage of the five-spotted hawk moth. This list will help you learn about common pests and diseases and how to identify t… When you think you’ve collected all of the dead plant, follow these disposal tips: This list will help you learn about common pests and diseases and how to identify them. However, if you suspect wireworms are present, here are a few techniques you can try to limit their destructiveness: Cucumber beetles eat roots, leaves, and flowers and transmit bacterial wilt disease along the way. Cabbage looper. As larvae, they feed on roots, leaving plants susceptible to wind damage. Attacks plum, apricot, cherry and chokecherry trees -- both fruiting and ornamental. Commonly found in: Soil Greenhouses/Tunnels. Reddish-orange spore masses are found primarily on the surface of lower leaves. Click on the links or pictures below to learn more. The RHS has analysed thousands of gardener enquiries for its latest tally of top 10 diseases and pests. They are responsible for a great deal of damage and are characterized by wilting, scabs, moldy coatings, rusts, blotches and rotted tissue. ​The best way to control whiteflies is to constantly monitor for them and use a combination of techniques to keep their population down. Identifying the problem is the first step in finding an earth-friendly way to reduce — or even eliminate — the damage … Many plant diseases can quickly return if the dead plant matter isn’t properly disposed of. Even the best house plant owner will come across pests. Cucumber plants are sensitive to many chemicals, so follow the label’s instructions carefully and use chemicals only as a last resort. This page is designed to help identify some of the more common plant diseases … Wireworms are very common in most types of soil and can be found year-round. Control the damage done by cucumber beetles by buying wilt-resistant plants and keeping plants off the ground by using a trellis. You can try searching the whole site by using the box below. Common on woody shrubs and herbaceous plants including grapes, raspberries and roses. Common on cherries, peaches and plums, but may also affect other kinds of stone fruits. Gardening in your yard has major upsides, but it has one irritating downside: pests and diseases that attack your beautiful plants and delicious homegrown vegetables. It affects squash, too, but to a much lesser extent. Disease fungi take their energy from the plants on which they live. Occurs when old seed is planted in cold, wet soil and is further increased by poor drainage. Both stages of this insect are formidable to see, but the hornworm is not a welcome sight in the vegetable garden. Advice Pests and Diseases Pest and Disease Directory. Infected plant leaves have intermingled patches of light green or yellowish colors. Click on a pest to be taken to a page full of useful information about how to identify it and prevent problems. If wireworms feed on the roots of plants, the plants will grow slowly and will be weak. Plant Disease Identification Guides. A common tuber disease that shows as dark, pithy patches that may be raised and “warty.”. No Results. Healthy indoor plants will be able to resist and fight off pests and diseases much better than weak plants. The larvae are white and thin. Attacks: Leaves Fruit Seeds Bark Seedlings Flowers Stems Roots. University of Colorado Extension, Marie Iannotti is an author, photographer, and speaker with 27 years of experience as a Cornell Cooperative Extension Horticulture Educator and Master Gardener, The Spruce uses only high-quality sources, including peer-reviewed studies, to support the facts within our articles. Infected plants develop dark, water soaked lesions on stems, leaves or fruit. If an infestation still occurs, use a pesticide such as Rotenone or Pyrethrum on your plants. Ripening tomato and pepper fruits develop a large, sunken, leathery spot on the bottom end. From Gardener's Supply (www.gardeners.com) Garden Pest and Disease Directory. Use the pest and disease factsheets to diagnose the problems with your plants and follow the recommended solutions to treat them. Holes in cabbage leaves are a telltale sign of cabbage worm feeding. Symptoms appear as yellow to white patches on the upper surfaces of older leaves. Spraying with a jet of water and/or insecticidal soap gets rid of the problem. Whiteflies. No Results. If you discover a small infestation in your garden, wash it off with a blast of water from the hose or by sinking the plant into a bucket of water.