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Eastern Tent Caterpillar
Author(s) C. F. Koval, S. W. Binnie. The eastern tent caterpillar is native to North America, and records of its existence go back as far as 1646....
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Deciduous Tree Disorder: Cankerworms
Author(s) P. J. Pellitteri, D. L. Mahr, D. J. Hall. Severe, early season defoliation of several hardwood species may be caused by spring or fall c...
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Birch Leafminer
Author(s) P. J. Pellitteri. Birch leafminers are insects that can destroy the leaves of all ornamental birch varieties grown in Wisconsin. Europea...
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Birch Disorder: Bronze Birch Borer
Author(s) R. C. Williamson, P. J. Pellitteri. The bronze birch borer is a serious pest of birch trees in the Midwest. It can severely injure or ki...
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Ash Plant Bug
Author(s) P. J. Pellitteri, C. F. Koval A small insect called the ash plant bug attacks ash trees in June and July, causing thin, discolored, spot...
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Preserving Trees During Construction
Author(s) Stan Binnie. Home construction can easily damage or even kill prized and valuable landscape trees. Learn the simple steps of safely prot...
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Mountain Ash Disorder: Sunscald-Fungal Canker Complex
Author(s) M. F. Heimann, G. L. Worf. Physical damage to the trunk—caused by sunscald or even lawn mower damage—opens the way for a fungal infectio...
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Mountain Ash Disorder: Fire Blight
Author(s) M.F. Heimann, G.L. Worf. Fire blight sometimes causes dramatic and serious damage, blackening leaves and either the vegetative shoots or...
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Maple and Other Trees Disorder: Cottony Maple Scale
Author(s) C. F. Koval, D. L. Mahr, P. J. Pellitteri. Cottony maple scale is an insect that can infest the twigs of maples and other shade trees wi...
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Linden Borer
Author(s) C. A. Johnson, R. C. Williamson. The linden borer (Saperda vestita Say) is a native insect found throughout northeastern North America t...
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Honeylocust Disorder: Canker Diseases in Wisconsin
Author(s) G. L. Worf, M. F. Heimann. The honeylocust has become an increasingly important street and landscape tree in Wisconsin. Finer textured a...
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Gypsy Moths: Identifying and Managing Gypsy Moth Caterpillars
Author(s) R. Chris Williamson, Andrea Diss. The gypsy moth caterpillar has a distinctively bristly body, with five pairs of blue warts followed by...
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Spruce Disorder: Spruce Gall Adelgids
Author(s) R. C. Williamson, P. J. Pellitteri. Tiny aphid-like insects frequently cause unusual swellings called galls at or near the ends of spruc...
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Sooty Mold
Author(s) M. F. Heimann, G. L. Worf, P. J. Pellitteri. Sooty mold can be found on virtually any plant in the state. Nearly all shade trees and eve...
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Wisconsin Land Use Megatrends: Forests
Author(s) Anna Haines, Lynn Markham, Dan McFarlane, Eric Olson, Rebecca Roberts, Linda Stoll. Forests have played a large role in the physical and...
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Dutch Elm Disease in Wisconsin
Author(s) M. F. Heimann, P. J. Pellitteri, E. B. Smalley, R. P. Guries. Dutch elm disease is a fatal fungus disease attacking American elms. The f...
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Deciduous Tree and Shrub Disorder: Skeletonizing by Rose Chafer
Author(s) R. C. Williamson, C. F. Koval. Skeletonizing of the leaves of roses, raspberries, grapes, fruit trees, and many other cultivated trees a...
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Caring for Deciduous Shrubs
Author(s) E. R. Hasselkus Here's sound advice on planting, watering, mulching, pruning, and maintaining flowering shrubs and other woody plants (...
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Pine Needle Diseases: Brown Spot and Lophodermium Needlecast
Author(s) M. F. Heimann, G. R. Stanosz, G. L. Worf. These two, needle diseases can make Christmas trees unmarketable and can ruin the beauty of Sc...
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Mountain Ash Disorder: Scab
Author(s) M.F. Heimann, G.R. Stanosz, G.L. Worf. Mountain ash scab is not always a serious problem in Wisconsin, but in wet years it can reach nea...
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Maple Petiole Borer
Author(s) P. J. Pellitteri, D. L. Mahr. The maple petiole borer is an introduced species that has extended its range from the northeastern states ...
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Maple Gall Mites
Author(s) P. J. Pellitteri, C. F. Koval, D. L. Mahr. Maple leaves frequently develop growths or swellings known as galls. These are caused by micr...
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Japanese Beetles
Author(s) R. Chris Williamson. This fact sheet on the Japanese beetle, considered the single most important turf grass pest in the United States ...
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Honeysuckle Disorder: Honeysuckle Leaffolding Aphid
Author(s) C. F. Koval, D. L. Mahr. Landscapers and nursery operators in Wisconsin long considered honeysuckle a low-maintenance plant. The arrival...
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