Trees & Shrubs

Author(s) M. F. Heimann, P. J. Pellitteri Despite their name, evergreen needles do not stay green forever. Older, inner needles discolor and drop ...

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

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

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, mower...

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) 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) E. R. Hasselkus, E. E. Schulte Explains what fertilizer you should use and how you should apply it to your deciduous trees, evergreens, ...

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

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 ever...

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

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 Scot...

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 infection...

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 near...

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

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) William Klase, Kris Tiles Which trees yield the best firewood? What are the steps in properly harvesting trees? How about splitting and...

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...