Species and Varieties

Information on selecting the best varieties of trees and shrubs, including walnut, oak, pine, hemlock, beech, ironwood, viburnum, crabapple, boxwood, fir, ash, pachysandra, poplar, privet, hackberry, holly, dogwood, elm, hawthorn and hickory.

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Master Gardener Woody Plant ID: Flowering Trees Adv. Cert.
Master Gardener Woody Plant ID: Flowering Trees Adv. Cert. - Workshops Workshops
$60.00
Master Gardeners and Green Industry Professionals are invited to join us for the Woody Plant Identification: Flowering Trees Advanced Certification. More
Windbreaks and Shade Trees
Windbreaks and Shade Trees - Articles Articles

Windbreaks and Shade Trees

Bryan Swistock

This publication provides information for homeowners interested in using shade trees and windbreaks for energy savings. More
Wild bees like this bumble bee are essential to Pennsylvania agriculture.
Conserving Wild Bees in Pennsylvania - Articles Articles

Conserving Wild Bees in Pennsylvania

Mary Barbercheck, Ph.D., David Mortensen, Ph.D.

Wild bees, which include native and naturalized bees, pollinate a variety of crops. In areas of Pennsylvania, wild bees already provide the majority of pollination for some summer vegetable crops. More
Woody Plant Identification: Deciduous Shrubs
Woody Plant Identification: Deciduous Shrubs - Workshops Workshops

Woody Plant Identification: Deciduous Shrubs

05/15/2018

Reading, PA

$60.00
This six-hour course is designed to teach the identification and usage of deciduous shrubs that are hardy in Pennsylvania. More
Planting and After Care of Community Trees
Planting and After Care of Community Trees - Articles Articles

Planting and After Care of Community Trees

William Elmendorf, Ph.D., Larry Kuhns

This publication is for people who plant trees in public landscapes, such as streets and parks, but its advice also is useful to those who plant trees around homes and businesses. 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

A Guide for Selecting Shrubs for Pennsylvania Landscapes

Jim Sellmer, Ph.D., J. Robert Nuss

Information for over 100 shrubs, including: the selection and aesthetic qualities of shrubs, and shrubs for specific conditions. More
Black walnut fruit. Photo: K. Salisbury, Penn State
Working With the Black Walnut - Articles Articles

Working With the Black Walnut

Kathleen V. Salisbury

Black walnut is one of the last trees to leaf out in the spring and one of the first to lose its leaves in the fall. More
Micrathena gracilis female
Spined Micrathena - Articles Articles
This small spider is commonly encountered in wooded locations, including landscaped residential and suburban locales. More
Whitney Cranshaw, Colorado State University, Bugwood.org
Oystershell Scale - Articles Articles
The oystershell scale is a common armored scale insect that causes injury to shade trees and shrubs, most often lilac, ash, dogwood, maple, poplar, and willow. More
Lorraine Graney, Bartlett Tree Experts, Bugwood.org
Obscure Scale - Articles Articles
The armored obscure scale is a key pest of oak in Pennsylvania, and can attack other woody host plants such as beech, dogwood, hickory, maple, and willow. More
Pest and Diseases Image Library, Bugwood.org
Oak Leaf Itch Mite - Articles Articles
The oak leaf itch mite, thought to have originated in Europe, has been recorded from Australia, India, Egypt, Chile and most recently, the United States. More
Eric R. Day, Virginia Polytechnic Institute and State University, Bugwood.org
Magnolia Scale - Articles Articles
The magnolia scale is one of the largest scale insects in the United States. It feeds only on magnolia. More
John Ghent, John Ghent, Bugwood.org
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
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
Lacy L. Hyche, Auburn University, Bugwood.org
European Fruit Lecanium - Articles Articles
The European fruit lecanium is a key soft scale insect pest of shade trees and other woody ornamental plants in Pennsylvania. More
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