Pests and Diseases

Information on private forest pests and diseases, including spiders, worms, scale, caterpillars, weevils, mites, spotted lantern fly, knotweed, multiflora rose and other invasive weeds.

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Do Lichens Cause Harm to Trees?
Do Lichens Cause Harm to Trees? - Videos Videos

Do Lichens Cause Harm to Trees?

Scott Weikert


Lichens are often thought to be a pest or disease to trees and shrubs. More
Araneus saevus male
Fierce Orbweaver - Articles Articles
Araneus saevus is found from Canada into the northern United States. It can be seen in forested areas and suburbia with mature landscape plantings. More
John Ghent, John Ghent,
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
USDA Forest Service - Northeastern Area, USDA Forest Service,
Elm Spanworm - Articles Articles
The elm spanworm is a serious defoliator of hardwood shade and forest trees in the eastern United States. 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
Why are My Spruce Trees Dying?
Why are My Spruce Trees Dying? - Videos Videos

Why are My Spruce Trees Dying?

Kimberly Bohn, Ph.D.


Learn how to identify types of spruce trees, symptoms of two common fungal diseases, and what if any treatments are available. More
Herbicide treatments are often used to reduce competition between undesirable vegetation and planted or naturally established tree seedlings.
Chemical Control of Forest Vegetation - Articles Articles
This article details control methods involving pesticides and herbicides by application method. More
Photo: Leslie J. Mehrhoff, University of Connecticut,, Japanese barberry, Berberis thunbergii, Infestation
The Invasive Japanese Barberry - Articles Articles
Japanese barberry (Berberis thunbergii) is an invasive, non-native woody plant that can grow 3 to 6 feet tall with a similar width. More
Tim Tigner, Virginia Department of Forestry,
Eastern Tent Caterpillar - Articles Articles
The eastern tent caterpillar has been observed in the United States since 1646. Outbreaks frequently occur at eight to ten year intervals. 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
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
Gerald J. Lenhard, Louisiana State University,
Tuliptree Scale - Articles Articles
The tuliptree scale is a pest of yellow poplar, or tuliptree, magnolia, and linden. This soft scale insect is so prolific that it can cover twigs and branches. 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
Natural Areas and Purple Loosestrife
Natural Areas and Purple Loosestrife - Articles Articles
Importance and background of natural areas, including activities related to monitoring and controlling Purple Loosestrife. More
What Can Property Owners Do About the Spotted Lantern Fly
What Can Property Owners Do About the Spotted Lantern Fly - Videos Videos
This presentation looks at management options property owners can use on their property throughout the year. More
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