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Crabapples with vole damage. Note the English ivy being used as a ground cover. Photo: Tim Abbey, Penn State
English Ivy in the Landscape - Articles Articles
English ivy is an evergreen with dark green older foliage that has white veins, while new growth is a lighter green color. More
Wheel bug nymphs
Attracting Beneficial Insects - Articles Articles
There are numerous insects that can be considered “beneficial.” More
Pruning Flowering Shrubs
Pruning Flowering Shrubs - Articles Articles
The correct time to prune your flowering shrubs depends on when they flower. More
Above top, firepower — the flower of Hydrangea paniculata “Bulk,” also known as Quick Fire, is one of the earliest to emerge of this species and turns an attractive pinkish-red. Bottom, hydrangea arborescens “Annabelle” is blooming now in our state.
Take a Look at Hydrangeas - Articles Articles
American consumers love to buy the latest and greatest, whether it's electronic gadgets, new cars, or the latest fashions. More
Whitney Cranshaw, Colorado State University,
Fletcher Scale - Articles Articles
The Fletcher scale, sometimes referred to as the arborvitae soft scale, is a common pest of arborvitae and yew. It can also attack juniper, cypress, and hemlock. More
John Ghent, John Ghent,
Hemlock Woolly Adelgid - Articles Articles
In much of Pennsylvania, the hemlock woolly adelgid has caused significant damage to eastern hemlock in ornamental plantings and the forest. More
Milan Zubrik, Forest Research Institute - Slovakia,
European Pine Shoot Moth - Articles Articles
The European pine shoot moth is a key pest of ornamental pine plantings, pines in production nurseries, and Christmas trees in Pennsylvania. More
Swiss stone pine, Pinus cembra, is a slow growing, stately conifer that is well-suited for smaller landscapes.
You Can Have Your Pine and Eat It, Too - Eventually - Articles Articles
Needled evergreens have been described as the “backbones of the landscape.” 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
A. Steven Munson, USDA Forest Service,
European Pine Sawfly - Articles Articles
The European pine sawfly is common in Pennsylvania. The larval stage feeds on the needles of pine trees in landscapes, nurseries, and Christmas tree plantations. More
Eric R. Day, Virginia Polytechnic Institute and State University,
Elongate Hemlock Scale - Articles Articles
The elongate hemlock scale, sometimes known as the fiorinia scale, is a serious armored scale insect pest on ornamental and forest hemlock trees in Pennsylvania. More
Gyorgy Csoka, Hungary Forest Research Institute,
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
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
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