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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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
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
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
Taxus Diseases
Taxus Diseases - Articles Articles

Taxus Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Taxus diseases. 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
Sources Of Plant Disease In Nurseries
Sources Of Plant Disease In Nurseries - Articles Articles

Sources Of Plant Disease In Nurseries

Gary W. Moorman, Ph.D.

Where do diseases begin? Learn to minimize losses caused by plant pathogens by reducing or eliminating the numbers of pathogens at their source. More
Cross-wall near base of branch
Rhizoctonia - Articles Articles

Rhizoctonia

Gary W. Moorman, Ph.D.

Rhizoctonia, a soil-borne fungus, is known to cause root rots, stem rots, damping-off and, in some cases, a blight of leaves. More
Penn State Department of Plant Pathology & Environmental Microbiology Archives, Penn State, Bugwood.org
Pythium - Articles Articles

Pythium

Gary W. Moorman, Ph.D.

Root rot can be caused by several different species of the fungus-like organism Pythium. More
Zinnia Diseases
Zinnia Diseases - Articles Articles

Zinnia Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Zinnia diseases. 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
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
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
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
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