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
Downy mildew on pumpkin. Photo: Beth K. Gugino, Penn State
Vegetable Disease Updates: August 30, 2017 - Articles Articles
Within the past week, there have been three separate reports of downy mildew on jack-o-lantern pumpkin in eastern Virginia. More
Late season fungicides needed to protect against fruit rot in storage. Photo: K. Peter, Penn State
Apple Disease, Pre- and Post-harvest - Keep Apples Free From Fruit Rot - Articles Articles
Management considerations are discussed for mitigating pome fruit rots before and after harvesting. More
Photo 1. Early symptom of orange rust. Photo: K. Demchak
Bramble Disease - Managing Orange Rust - Articles Articles

Bramble Disease - Managing Orange Rust

Kathy Demchak, mahfuzur rahman

Orange rust, Gymnoconia nitens, is a systemic disease, any plants propagated from infected plants will also be infected. More
Bacterial spot on peach fruit. Photo by S. Bardsley.
Stone Fruit Disease - Bacterial Spot, Refining Disease Management - Articles Articles
Bacterial spot, Xanthomonas arboricola pv. pruni, is a difficult disease to manage. More
Dull, olive green areas visible on the undersides of leaves are the first evidence of apple scab.
Tree Fruit Disease - An Apple Scab Review - Articles Articles
Early season apple disease management is primarily directed at controlling scab. More
Upper surface of affected shrub rose showing round leaf spots with an orange center on yellowing leaves. Image: R. Benner, Penn State
Rose Rust in the Landscape - Articles Articles
Rose Rust is uncommon on ornamental roses in Pennsylvania but it does occur, especially in mild, wet spring conditions. More
Photo: P. Landschoot, Penn State
SDHI Fungicides for Turfgrass Diseases - Articles Articles

SDHI Fungicides for Turfgrass Diseases

Peter Landschoot, Ph.D.

As summer approaches, plans are being finalized for disease prevention and control programs. More
Tobacco Mosaic Virus on petunia. Photo: T. Ford, Penn State
Tobacco Mosaic Virus Prevention Starts with Worker Training - Articles Articles
The most important way that Tobacco Mosaic Virus (TMV) can be spread from plant to plant is on workers' hands, clothing or on tools. More
University of Georgia Plant Pathology, University of Georgia, Bugwood.org
Grape Disease - Black Rot Photo Gallery - Articles Articles
Slideshow depicting various stages of black rot on grapes. More
Diagnosing Injury to Woody Ornamentals
Diagnosing Injury to Woody Ornamentals - Articles Articles
Adapted from Johnson, W.T. and H.H. Lyon. 1991. Insects that feed on trees and shrubs. 2nd ed., Cornell Univ. Press, Ithaca, New York, 560 pp. More
Major Insect Pests of Red Clover in Pennsylvania
Major Insect Pests of Red Clover in Pennsylvania - Articles Articles
Two insect pests, the clover root curculio and the clover root borer, are partially responsible for the reduction or elimination of red clover stands. More
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
What's That!
What's That! - Articles Articles

What's That!

Ed Rajotte, Ph.D.

Properly identifying the organism is the first step of integrated pest management (IPM). More
Peggy Greb, USDA Agricultural Research Service, Bugwood.org
Black Vine Weevil - Articles Articles
The black vine weevil is a serious pest in nurseries and established landscape plantings. More
Alton N. Sparks, Jr., University of Georgia, Bugwood.org
Integrated Pest Management (IPM) Tactics - Articles Articles
The goal of using multiple tactics or "many small hammers" is to effectively suppress pests below injurious levels and avoiding outbreaks. More
Greenhouse IPM
Greenhouse IPM - Articles Articles
PA IPM has devoted a great deal of effort to designing IPM solutions for greenhouse production, particularly biological control. More
Red thread disease, Corticium fuciforme, on perennial ryegrass. Courtesy of C. J. O'Rourke.
Diseases of Forage Grasses in Humid Temperate Zones - Articles Articles
Forage grasses are subject to a multitude of leaf, stem, floral, and root diseases. More
Edward L. Barnard, Florida Department of Agriculture and Consumer Services, Bugwood.org
Phytophthora Root Rot in Raspberries in the Home Garden - Articles Articles
Phytophthora root rot is now regarded as a major cause of declining red raspberry plantings. More
R. Stace-Smith, Bugwood.org
Leaf Curl Virus of Brambles in Home Gardens - Articles Articles
Raspberries are affected more severely by leaf curl than are blackberries. 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
Figure 1. Drain plugs must be sealed. Photo: PA Mushroom IPM Handbook
IPM in Mushroom Production: Exclusion Techniques for Pest Control - Articles Articles

IPM in Mushroom Production: Exclusion Techniques for Pest Control

Maria Gorgo-Gourovitch, David Meigs Beyer, Ph.D., John A. Pecchia, Ph.D.

Exclusion prevents the entrance of pest organisms into new rooms and their escape from older ones. The latter should not be underestimated. 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
Tips to Improve Your Lawn Care Program This Fall
Tips to Improve Your Lawn Care Program This Fall - Articles Articles
As nighttime temperatures dip into the low 50s and the days continue to get shorter, one thing is certain; fall is coming. 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
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