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Stay Alert for Oak Wilt!
Stay Alert for Oak Wilt! - Articles Articles
Oak wilt was not known in New York before 2008, but foresters and arborists are managing it there now. More
Pruning Flowering Shrubs
Pruning Flowering Shrubs - Articles Articles
The correct time to prune your flowering shrubs depends on when they flower. More
Galls on Oak
Galls on Oak - Articles Articles
There are a variety of gall-forming species of small wasps that commonly infest oak trees in Pennsylvania. More
John Ghent, John Ghent, Bugwood.org
Fall Cankerworm - Articles Articles
The fall cankerworm is a native pest of hardwood trees in North America. It causes some defoliation in the forest every year, with larger outbreaks occasionally. 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
Evergreens near a high use roadway are wrapped with burlap to give some protection from damaging salt spray.
Salt Spray Damage and Evergreen Plants - Articles Articles
Evergreens provide year long interest in the landscape and are normally pretty hardy during the winter months. More
Best Management Practices for Bee Health
Best Management Practices for Bee Health - Articles Articles
The Horticultural Research Institute, the research foundation of AmericanHort, announces the release of Best Management Practices for Bee Health in the Horticultural Industry. More
Oakleaf hydrangea in full bloom. Notice the shape of the leaves. Photo: T. Butzler, Penn State
A Guide for Selecting Shrubs for Pennsylvania Landscapes - Articles Articles
Information for over 100 shrubs, including: the selection and aesthetic qualities of shrubs, and shrubs for specific conditions. More
Ward Upham, Kansas State University, Bugwood.org
Elm Leaf Beetle - Articles Articles
The elm leaf beetle is an introduced pest that feeds only on species of elm. Trees growing in landscapes are more heavily infested than those in forests. More
Gyorgy Csoka, Hungary Forest Research Institute, Bugwood.org
Euonymus Scale - Articles Articles
The euonymus scale is a key pest of euonymus, pachysandra, and bittersweet. This armored scale insect is native to Japan and China. More
Emerald Ash Borer Photos
Emerald Ash Borer Photos - Articles Articles
Photos of EAB damage on ash trees, the insects, and a purple panel sticky trap 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
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
Twospotted spider mite (Tetranychus urticae) Photo: David Cappaert, Michigan State University, Bugwood.org
Twospotted Spider Mites - Articles Articles
One of our most common landscape pests is the two-spotted spider mite (Tetranychus urticae). More
Tree Diseases that Create Hazards
Tree Diseases that Create Hazards - Articles Articles
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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