Trees & Shrubs

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) 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...

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

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...

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

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

Author(s) G. L. Worf, J. S. Stewart. Russian olive (Elaeagnus angustifolia) is a small tree with beautiful, silver-gray foliage. The tree was once...

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...

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...

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 ...

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...

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 for...

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

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

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

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...

Author(s) E. R. Hasselkus Here's sound advice on planting, watering, mulching, pruning, and maintaining flowering shrubs and other woody plants (...