Plant Disease Identification and Control

Information on plant disease identification and control, including rot, freeze damage, rust, blight, mold, scales, bacteria, viruses, fungus, wilt, mildew, gall, mites, moths and cankers. Tips on integrated pest management and herbicide summaries.

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Frost damage on ash
Will My Woody Plants Recover from Freeze Damage - Articles Articles
When we have unusually high temperatures in early spring, many woody trees and shrubs will break bud and leaf out or flower early. More
Scheduling Disease Control In Woody Ornamentals
Scheduling Disease Control In Woody Ornamentals - Articles Articles
The scheduling of effective disease management measures is not a simple task nor can it be standardized. More
Phytophthora on African violet
Phytophthora Root Rot On Woody Ornamentals - Articles Articles
Fungus-like organisms belonging to the genus Phytophthora are soil- or plant-borne and all are plant pathogens. More
Pseudomonas syringae: A common pathogen on woody plants
Pseudomonas syringae: A common pathogen on woody plants - Articles Articles
The bacterium Pseudomonas syringae, is an opportunistic pathogen which attacks a wide variety of woody plants especially when they are damaged by frost or injury. More
Rose Black Spot
Rose Black Spot - Articles Articles

Rose Black Spot

Gary W. Moorman, Ph.D.

A common disease of roses called black spot is caused by the fungus Diplocarpon rosae. This fungus readily attacks young expanding leaves and young canes. More
Ericacea (Heath) Family and Their Culture
Ericacea (Heath) Family and Their Culture - Articles Articles

Ericacea (Heath) Family and Their Culture

Jim Sellmer, Ph.D., Rick Bates, Ph.D.

Generally, the ericaceous plants are woody and range in size from low ground covers to small trees over 20 feet tall. More
Landscaping and Gardening Around Walnuts and Other Juglone Producing Plants
Landscaping and Gardening Around Walnuts and Other Juglone Producing Plants - Articles Articles
Walnuts and hickories produce the chemical juglone (5 hydroxy-1,4- napthoquinone), which is exuded from all parts of the plant. More
What Killed this Tree? Site-Related Problems in the Landscape
What Killed this Tree? Site-Related Problems in the Landscape - Articles Articles
This article provides some questions to ask yourself when diagnosing plant problems in the landscape. More
Using Nature's Signals to Manage Landscape Pests
Using Nature's Signals to Manage Landscape Pests - Articles Articles

Using Nature's Signals to Manage Landscape Pests

Emelie Swackhamer, Gregory Hoover

The best way to make an effective pesticide application is to observe pest development at the site through regular monitoring. More
Pest Management Methods
Pest Management Methods - Articles Articles

Pest Management Methods

Emelie Swackhamer, J. Robert Nuss, Larry Kuhns, Gregory Hoover

IPM (integrated pest management) primarily consists of methods used to prevent plant problems from occurring in the first place. More
Monitor Pests and Keep Records
Monitor Pests and Keep Records - Articles Articles

Monitor Pests and Keep Records

Emelie Swackhamer, J. Robert Nuss, Larry Kuhns, Gregory Hoover

Inspecting your plants on a regular basis is essential to identifying and evaluating plant problems in their early stages. More
Pieris Diseases
Pieris Diseases - Articles Articles

Pieris Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Pieris diseases. More
Pyracantha Diseases
Pyracantha Diseases - Articles Articles

Pyracantha Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Pyracantha diseases. More
Scott Bauer, USDA Agricultural Research Service, Bugwood.org
Plum Pox Virus In Ornamentals - Articles Articles

Plum Pox Virus In Ornamentals

Gary W. Moorman, Ph.D.

Plum pox is a serious disease of Prunus species caused by a virus. More
Gerald Holmes, California Polytechnic State University at San Luis Obispo, Bugwood.org
Powdery Mildew Cross Listing - Articles Articles

Powdery Mildew Cross Listing

Gary W. Moorman, Ph.D.

A few of the common powdery mildews and the plants that each can infect are listed here. More
Virus Diseases
Virus Diseases - Articles Articles

Virus Diseases

Gary W. Moorman, Ph.D.

Viruses are submicroscopic entities capable of causing disease. They are a piece of nucleic acid (genetic material) surrounded by a protein coat. More
Tobacco Mosaic Virus (TMV)
Tobacco Mosaic Virus (TMV) - Articles Articles

Tobacco Mosaic Virus (TMV)

Gary W. Moorman, Ph.D.

Tobacco mosaic virus (TMV) is named for one of the first plants in which it was found in the 1800s. However, it can infect well over 350 different species of plants. More
References For Floricultural Crop Diseases
References For Floricultural Crop Diseases - Articles Articles
It is very helpful to know where information can be obtained to diagnose and learn more about plant diseases. More
Powdery mildew on Poinsettia
Powdery Mildew - Articles Articles

Powdery Mildew

Gary W. Moorman, Ph.D.

Powdery mildew occurs on many different flowers, woody ornamentals and trees. More
Viola Diseases
Viola Diseases - Articles Articles

Viola Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Viola diseases. More
Vinca Diseases
Vinca Diseases - Articles Articles

Vinca Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Vinca diseases. More
Verbena Diseases
Verbena Diseases - Articles Articles

Verbena Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Verbena diseases. More
Tulip Diseases
Tulip Diseases - Articles Articles

Tulip Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Tulip diseases. More
Syngonium Diseases
Syngonium Diseases - Articles Articles

Syngonium Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Syngonium diseases. More
Rudbeckia Diseases
Rudbeckia Diseases - Articles Articles
Informational table showing disease name, symptoms, pathogen/cause, and management of Rudbeckia diseases. More
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