Trees & Shrubs

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, R. C. Newman When the herbicides used to kill broadleaf weeds in the lawn are applied on windy or hot days, they may end ...

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) P. J. Pellitteri, D. L. Mahr, D. J. Hall Early season defoliation of pines in southern Wisconsin may be attributed to European pine sawf...

Author(s) M. F. Heimann, G. L. Worf, R. F. Patton Dothistroma needle blight causes needle spots, discoloration, and substantial needle loss in hea...

Author(s) Jane Cummings Carlson, A. Jeff Martin, Kyoko Scanlon Thousands of oaks in woodland and urban settings die every year from oak wilt, a fu...

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) 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) M. F. Heimann, G. L. Worf, J. E. Kuntz, M. J. Drilias Research has demonstrated that many of Wisconsin sugar maples are declining becaus...

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

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...

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) Christine Stephens, Anne Hartung, Patrick Hart, Michael Mispagel How do you know whether that leaf discoloration is a cosmetic issue lik...