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Winterberry holly Photo: Mike Masiuk, Penn State
Why Doesn't My Holly Have Berries? - Articles Articles
Lack of berries on holly is a common concern for home gardeners. This article identifies some of the reasons and possible solutions. More
Winterberry fruit. Photo credit: Mike Masiuk
Shrubs and Trees for the Winter Landscape - Articles Articles
Look for trees and shrubs that could beautify your property and nurture wildlife during the winter months. More
Photo credit: Lois Miklas
De-Icers and Plant Health - Articles Articles
Find out what effect winter de-icers can have on plants and which types are least harmful. More
Christmas Tree Farm Photo credit: Penn State Extension Master Gardener Program
Master Gardener Tips for Christmas Trees - Articles Articles

Master Gardener Tips for Christmas Trees

Lois Miklas, Carol Papas

This article discusses how to choose the perfect tree and keep it fresh. It also addresses unnecessary concerns about finding spotted lanternfly on fresh Christmas trees. More
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
Stigmina Leaf Spot. Photo by Joseph OBrien, USDA Forest Service,
Tree Diseases - Articles Articles

Tree Diseases

Tim Abbey

Living in the humid mid-Atlantic area, we have lots of fungal and bacterial diseases to contend with. More
Acer rubrum Red Sunset® on a commercial site with suspected glyphosate damage. Photo: S. Feather, Penn State
Use Glyphosate With Care Near Trees! - Articles Articles
Glyphosate is the active ingredient in non-selective, systemic herbicides sold under a variety of trade names – Round Up, Accord, Glypro, and many others. More
Damage to a row of boxwoods from boxwood leafminer. Photo: T. Butzler, Penn State
The Boxwood Leafminer Makes Its Yearly Entrance in Spring - Articles Articles
Boxwoods have many positive qualities that make it one of the most popular shrubs in the landscape. More
Four-lined plant bug adult. Photo: S. Feather, Penn State
Four-lined Plant Bugs Are Active Now - Articles Articles
Four-lined plant bugs, Poecilocapsus lineatus, become active in May. More
Organic Land Care Best Management Practices Manual
Organic Land Care Best Management Practices Manual - Articles Articles
This free manual provides recommendations to land managers and landscape contractors on best management practices for effectively conducting organic land care. More
James B. Hanson, USDA Forest Service,
White Pine Weevil - Articles Articles
The white pine weevil is considered the most destructive insect pest of eastern white pine in North America. More
Gyorgy Csoka, Hungary Forest Research Institute,
Western Conifer Seed Bug - Articles Articles
The western conifer seed bug feeds on Douglas-fir seeds and other species of pine. This bug can also become a nuisance to homeowners in the fall. More
USDA Forest Service - Region 4 - Intermountain, USDA Forest Service,
Spruce Spider Mite - Articles Articles
The spruce spider mite attacks spruce, arborvitae, juniper, hemlock, pine, Douglas-fir, and occasionally other conifers. More
Whitney Cranshaw, Colorado State University,
Snailcase Bagworm - Articles Articles
The snailcase bagworm is a moth (family Psychidae) that was accidentally introduced into the United States from Europe in the 1940s. More
Rhododendron Borer
Rhododendron Borer - Articles Articles
The rhododendron borer is a native pest of rhododendron, sometimes attacking mountain laurel and deciduous azaleas growing adjacent to infested host plants. More
Scott Tunnock, USDA Forest Service,
Pine Needle Scale - Articles Articles
The pine needle scale is a key native pest of pine, Douglas-fir, spruce, and cedar in landscapes, nurseries, and Christmas tree plantations in Pennsylvania. More
USDA Forest Service - Northeastern Area , USDA Forest Service,
Old House Borer - Articles Articles
The old house borer is an injurious wood-boring insect. The larva bores through pine, spruce, and other coniferous woods, weakening structural timbers. More
Jim Baker, North Carolina State University,
Native Holly Leafminer - Articles Articles
Ornamental plantings of holly in Pennsylvania are often damaged by leafmining pests. The native holly leafminer only feeds on the foliage of American holly. More
USDA Forest Service, USDA Forest Service,
Lace Bugs on Broad-Leaved Evergreen Ornamental Plants - Articles Articles
Twenty-eight lace bug species have been recorded in Pennsylvania, but only a few are key pests of ornamental evergreen plants like azalea and rhododendron. More
Joseph LaForest, University of Georgia,
Juniper Scale - Articles Articles
The juniper scale, native to Europe, is now found throughout the United States. This key pest attacks junipers, cypresses, falsecypress, and incense cedar in landscapes and nurseries. 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
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
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
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
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
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