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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Whitney Cranshaw, Colorado State University, Bugwood.org
Cooley Spruce Gall Adelgid - Articles Articles
The most common host plants of Cooley spruce gall adelgid are Colorado blue spruce and Douglas-fir that are grown as landscape ornamentals and Christmas trees. 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
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
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
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
Spruce Diseases
Spruce Diseases - Articles Articles

Spruce Diseases

Gary W. Moorman, Ph.D.

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

Privet Diseases

Gary W. Moorman, Ph.D.

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

Pine Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Pine 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
Norfolk Island Pine Diseases
Norfolk Island Pine Diseases - Articles Articles

Norfolk Island Pine Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Norfolk Island Pine diseases. More
Nematode eggs.
Nematode-caused Diseases On Woody Ornamentals - Articles Articles
Nematodes are soil-dwelling non-segmented roundworms, usually less than 0.5 mm (0.02 in.) long. More
Nectria fruiting on a twig
Nectria Canker - Articles Articles

Nectria Canker

Gary W. Moorman, Ph.D.

The fungus Nectria invades wood damaged by freezing, hail, animals and insects. More
Mountain Laurel Diseases
Mountain Laurel Diseases - Articles Articles

Mountain Laurel Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Mountain Laurel diseases. More
Needlecast Diseases
Needlecast Diseases - Articles Articles

Needlecast Diseases

Gary W. Moorman, Ph.D.

Needlecast diseases of evergreens are caused by several fungi. More
Leucothoe Diseases
Leucothoe Diseases - Articles Articles

Leucothoe Diseases

Gary W. Moorman, Ph.D.

Informational table showing disease name, symptoms, pathogen/cause, and management of Leucothoe 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 Outdoors
Key Plants and Key Diseases Outdoors - Articles Articles

Key Plants and Key Diseases Outdoors

Gary W. Moorman, Ph.D.

Selecting plants for placement in the landscape can be simplified if the key plants are known and if the key diseases on those plants can be identified. More
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