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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Stay Alert for Oak Wilt!
Stay Alert for Oak Wilt! - Articles Articles

Stay Alert for Oak Wilt!

Sandy Feather

Oak wilt was not known in New York before 2008, but foresters and arborists are managing it there now. More
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
Wilting maple
Verticillium Wilt of Woody Ornamentals - Articles Articles

Verticillium Wilt of Woody Ornamentals

Gary W. Moorman, Ph.D.

Most deciduous trees and shrubs are susceptible to a disease called Verticillium wilt caused by the fungus Verticillium. Conifers do not appear to be susceptible. More
Tree Diseases that Create Hazards
Tree Diseases that Create Hazards - Articles Articles

Tree Diseases that Create Hazards

Gary W. Moorman, Ph.D.

Certain diseases of trees weaken their structure and create a hazardous situation where serious damage could result from falling limbs or the toppling of the entire tree. 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
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
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
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
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
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
Infected boxwood branch shows typical leaf spots and lesions
Boxwood Blight: Emerging Threat to Pennsylvania's Landscape - Articles Articles
This article provides information about boxwood blight, including symptoms, management, and what to do if you suspect boxwood blight infection on your trees. More
Willow Diseases
Willow Diseases - Articles Articles

Willow Diseases

Gary W. Moorman, Ph.D.

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

Viburnum Diseases

Gary W. Moorman, Ph.D.

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

Tulip Poplar Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Tulip Poplar diseases. More
Rose Diseases (Outdoors)
Rose Diseases (Outdoors) - Articles Articles

Rose Diseases (Outdoors)

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Rose Diseases (Outdoors) diseases. More
Rose Diseases (Greenhouse)
Rose Diseases (Greenhouse) - Articles Articles
Informational table showing disease name, symptoms, pathogen/cause, and management of Rose Diseases (Greenhouse) diseases. More
Redbud Diseases
Redbud Diseases - Articles Articles

Redbud Diseases

Gary W. Moorman, Ph.D.

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

Poplar Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Poplar diseases. More
Impatiens, Downy Mildew - sporulation closeup, photo: Gary Moorman
Overview of Plant Diagnostics - Articles Articles
Getting to the bottom of a plant problem can be a challenge. More
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