Forest Health
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Environmental Causes of Tree Damage
Trees are damaged by a variety of weather events including storms, drought and flooding. Chemicals like pesticides and salt also harm trees. Healthy trees are better able to recover from these stress events.
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Red Pine Pocket Decline and Mortality
Red pine pocket decline and mortality is a disease of plantation-grown red pine. The most likely trees to show symptoms of this syndrome are 30- to 45-year-old red pines in thinned plantations. Studies to identify the reasons why certain…
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Oak Wilt
Learn if your property is at risk, how to reduce the spread of oak wilt in a forested area, how to know if a tree has oak wilt and much more. Distribution Oak wilt is widespread in southern Wisconsin, but in much of northern Wisconsin it is…
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Herbicides for Forest Management
The herbicide sensitivity tables listed here contain a large volume of information from the labels of herbicide products that are registered for various forestry uses. To be listed here, a product's labeling must contain wording specific to forestry.
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Find Forest Health Help
For sick forest trees, contact a DNR forest health specialist or forester. For sick ornamental or urban trees, contact a certified arborist [exit DNR] or your county UW-Extension Office [exit DNR].
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Spongy Moth (Lymantria dispar)
Those currently experiencing a spongy moth infestation are also invited to visit the interagency Wisconsin Spongy Moth Resource Center [exit DNR]. European spongy moths were accidentally introduced into Massachusetts in 1869 by an amateur…
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Forest Tent Caterpillar
The forest tent caterpillar is an important leaf-eating (defoliating) caterpillar in Wisconsin. Some people call forest tent caterpillars "army worms" because as they travel across the ground they look like marching soldiers. Distribution Forest…
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Emerald Ash Borer
Emerald ash borer (Agrilus planipennis) is an invasive, wood-boring beetle that kills ash trees (Fraxinus spp.) by eating the tissues under the bark. Native to northeastern Asia, emerald ash borer (EAB) was first detected in the United States in…
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Beech Bark Disease
Beech bark disease is a major threat to American beech (Fagus grandifolia) in eastern North America. The disease is the result of an interaction between an insect (a scale) and a fungus (Neonectria) and it only happens when both are present.