Insect Pests

Author(s) R. Chris Williamson, Andrea Diss The gypsy moth caterpillar has a distinctively bristly body, with five pairs of blue warts followed by ...

Author(s) K. A. Delahaut In Wisconsin, the euonymus caterpillar Yponomeuta cagnagella damages the spindletree euonymus, the winged euonymus (also ...

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. ...

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 ca...

Author(s) R. C. Williamson, C. F. Koval Skeletonizing of the leaves of roses, raspberries, grapes, fruit trees, and many other cultivated trees an...

Author(s) P. J. Pellitter Birch leafminers are insects that can destroy the leaves of all ornamental birch varieties grown in Wisconsin. European,...

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 kil...

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...

Author(s) C. A. Johnson, R. C. Williamson The linden borer (Saperda vestita Say) is a native insect found throughout northeastern North America th...

Author(s) R. Chris Williamson This fact sheet on the Japanese beetle, considered the single most important turf grass pest in the United States b...

Author(s) C. F. Koval, D. L. Mahr Landscapers and nursery operators in Wisconsin long considered honeysuckle a low-maintenance plant. The arrival ...

Author(s) K. A. Delahaut The honeylocust has become an increasingly important street and landscape tree in Wisconsin. Finer textured and less form...

Author(s) R. Chris Williamson, Andrea Diss Many insecticides are available to control gypsy moth; however, not all are created equal. Before you b...

Author(s) R. Chris Williamson, Andrea Diss Gypsy moth egg masses contain all the eggs a female moth produces. Each destroyed egg mass represents h...

Author(s) R. Chris Williamson This fact sheet covers the highly destructive gypsy moth, detailing its life cycle, the destruction it causes, and t...

Author(s) C. F. Koval, M. F. Heimann Oak trees that are dying from the top down or exhibiting drought-like symptoms may be infested with the twoli...

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 t...

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 micro...

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 wit...

Author(s) Chris Williamson, P.J. Liesch, Jim Kerns, Roger Flashinski Woody Ornamentals Pest Management in Wisconsin is an indispensable resource f...