Trees & Shrubs

Author(s) Laura G. Jull. Plant roots, like people, need oxygen for respiration. That is why a flood can stress a plant and even, if roots are subm...

Author(s) M. F. Heimann, G. L. Worf. Springtime weather injury can cause misleading symptoms on foliage. This fact sheet describes symptoms and st...

Author(s) G. L. Worf., J. E. Kuntz. Many problems and disorders can lead to tree decline. This fact sheet explores sun scald, girdling roots, mowe...

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) R. C. Williamson, P. J. Pellitteri. Tiny aphid-like insects frequently cause unusual swellings called galls at or near the ends of spruc...

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...

Author(s) Stan Binnie. Home construction can easily damage or even kill prized and valuable landscape trees. Learn the simple steps of safely prot...

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...

Author(s) M.F. Heimann, G.L. Worf. Fire blight sometimes causes dramatic and serious damage, blackening leaves and either the vegetative shoots or...

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...

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

Author(s) G. L. Worf, M. F. Heimann. The honeylocust has become an increasingly important street and landscape tree in Wisconsin. Finer textured a...

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...