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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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
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
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
Primula Diseases
Primula Diseases - Articles Articles
Informational table showing disease name, symptoms, pathogen/cause, and management of Primula diseases. 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
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
Snapdragon (Antirrhinum) Diseases
Snapdragon (Antirrhinum) Diseases - Articles Articles
Informational table showing disease name, symptoms, pathogen/cause, and management of Snapdragon (Antirrhinum) diseases. More
Poinsettia Diseases
Poinsettia Diseases - Articles Articles
Informational table showing disease name, symptoms, pathogen/cause, and management of Poinsettia diseases. More
Petunia Diseases
Petunia Diseases - Articles Articles

Petunia Diseases

Gary W. Moorman, Ph.D.

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

Pansy Diseases

Gary W. Moorman, Ph.D.

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

Pachysandra Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Pachysandra 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
Marigold Diseases
Marigold Diseases - Articles Articles

Marigold Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Marigold diseases. More
Cercospora spp., Cercospora fungi Photo: Yonghao Li, The Connecticut Agricultural Experiment Station, Bugwood.org
Leaf Spotting Fungi - Articles Articles

Leaf Spotting Fungi

Sinclair Adam

Leaf spotting fungi comprise a wide range of plant disease pathogens that do injury to many host plants. More
Key Plants And Key Diseases Indoors
Key Plants And Key Diseases Indoors - Articles Articles

Key Plants And Key Diseases Indoors

Gary W. Moorman, Ph.D.

Selecting plants for placement in the interiorscape can be simplified if the key plants used are known and if the key pathogens on those plants can be identified. More
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