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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Be proactive about fire blight management: Let’s not repeat 2014. (Photo: B. Lehman)
Disease Update: Blossoms Still Open—Fire Blight Risk Continues - News News
Conditions are favorable for fire blight and apple scab. Additional tools for the fire blight management toolbox are discussed. More
Control for fire blight and apple scab is critical during bloom. (Photo: K. Peter)
Disease Update: Watch Out For Diseases during Apple Bloom - News News
Bloom is well underway in parts of PA and MD. Fire blight and scab disease conditions are in full force now. Growers are encouraged to protect trees. 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
Dormant copper sprays are encouraged to help keep diseases in check. (Photo: K. Peter)
Disease Management Strategies For The Grower Radar - News News
Consider applying dormant sprays soon to manage fungal and bacterial diseases this season. More
Copper sprays need to be applied prior to bud swell to manage peach leaf curl. (Photo: K. Peter)
Disease Update: Copper Sprays and Orchard Sanitation to Manage Diseases - News News
Depending on your location, the warm weather over the last few weeks may have pushed some fruit trees along. For disease management, consider applying dormant copper and urea sprays soon. More
Whitney Cranshaw, Colorado State University,
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
Plum Pox Virus
Plum Pox Virus - Videos Videos
Part 3, 6 minutes. More
Peggy Greb, USDA Agricultural Research Service,
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,
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,
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,
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
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
A declining tree with bark removed from graft union to show necrosis. Note numerous rootstock suckers. (Photo: K. Peter)
Apple Disease - Rapid Apple Decline (RAD) or Sudden Apple Decline (SAD)? - Articles Articles
There is a mystery surrounding rapid apple decline/sudden apple decline of young, dwarf apple trees. More