Taking action

Watch For Woodpecker Damage On Ash Trees

Posted on by akabelowsky
Woodpecker flecking on the bark of a dying ash tree is visible at Winnebago County Community Park in Oshkosh.

Woodpecker flecking on the bark of a dying ash tree is visible at Winnebago County Community Park in Oshkosh. Flecking occurs when the birds peck away at the trees to feed on emerald ash borer larvae beneath the bark. / Photo Credit: Wisconsin DNR

By Bill McNee, DNR Forest Health Specialist
Bill.McNee@wisconsin.gov

The Wisconsin Department of Natural Resources (DNR) encourages property owners to watch for woodpecker damage to their ash trees this winter.

Woodpecker damage, often called “flecking,” happens when birds peck away some of a tree’s bark to access the larvae underneath. Flecking is a common early sign that an ash tree might be infested with emerald ash borer (EAB), an invasive insect. EAB is the most damaging threat to Wisconsin trees, killing more than 99% of the untreated ash trees it infests.

Continue reading “Watch For Woodpecker Damage On Ash Trees” →

Arbor Day Seedling Orders Open To Fourth-graders

Posted on by akabelowsky

By Wisconsin DNR

A worker plants a red pine seedling provided by the Wisconsin Department of Natural Resources.

A worker plants a red pine seedling provided by the Wisconsin Department of Natural Resources. / Photo Credit: Wisconsin DNR

The Wisconsin Department of Natural Resources (DNR) is offering free tree seedlings to every fourth-grade student in Wisconsin as part of its annual Arbor Day tree planting program.

Wisconsin fourth-grade principals, teachers and homeschoolers can now place seedling orders and coordinate delivery by completing the 2026 Arbor Day application by March 16, 2026.

Continue reading “Arbor Day Seedling Orders Open To Fourth-graders” →

DNR Urban Forestry Grant Update

Posted on by janness

The 2026 Urban Forestry Grant application deadline was Oct. 1, 2025, and the Wisconsin Department of Natural Resources (DNR) received 71 applications, equaling over $1.1 million in funding requests. A total of $559,680 is available in grant funding for 2026.

Cities, villages, towns, counties, tribes and 501(c)(3) nonprofit organizations in or conducting their project in Wisconsin are eligible to apply for an Urban Forestry Grant. The grants range from $1,000 to $25,000, and grant applicants must match each grant dollar for dollar. Grants are awarded to projects that align with state and national goals for increasing the urban forest canopy and the benefits it provides. Continue reading “DNR Urban Forestry Grant Update” →

Fourth Grade Arbor Day Seedling Orders Now Open

Posted on by janness

The Wisconsin Department of Natural Resources (DNR) is offering free tree seedlings to every fourth-grade student in Wisconsin as part of its annual Arbor Day tree planting program.

Wisconsin fourth grade principals, teachers and homeschoolers can now place seedling orders and coordinate delivery by completing the 2026 Arbor Day application by March 16, 2026. Continue reading “Fourth Grade Arbor Day Seedling Orders Now Open” →

After The Ice: Urban Forestry’s Role In Community Recovery And Resilience

Posted on by janness

By Lee Mueller, Davey Resource Group, Inc., Kevin Sayers, Michigan Department of Natural Resources and Paul Hickman, Urban Ashes

*Republished with permission from the authors

ice covered street trees

Photo Credit: MI DNR

Cold weather is just around the corner, so now is the time to develop or revisit winter storm response plans. Ice storms are a recurring challenge in the Midwest. Freezing rain can add substantial weight to limbs, causing even healthy trees to snap. Ultimately, events like this can offer opportunities to reassess communities’ approaches to tree management and build stronger, more resilient urban forests. Continue reading “After The Ice: Urban Forestry’s Role In Community Recovery And Resilience” →

Increased Tree Mortality Seen As Spongy Moth Outbreak Ends

Posted on by akabelowsky
Mature spongy moth larva on a tree at Potawatomi State Park in Door County, July 2025.

Mature spongy moth larva on a tree at Potawatomi State Park in Door County, July 2025. / Photo Credit: Wisconsin DNR

By Bill McNee, DNR Forest Health Specialist, Oshkosh
Bill.McNee@wisconsin.gov  

Wisconsin’s recent period of high spongy moth populations (an “outbreak”) came to an end in 2025, as the remaining known hotspots were aerially sprayed or naturally collapsed. Only a handful of large larvae were observed or reported by property owners.

Spongy moth populations are likely to be low across the state for at least the next few years. However, it is possible that some sites may experience a population increase before then, if local weather conditions are favorable for the insect.

Continue reading “Increased Tree Mortality Seen As Spongy Moth Outbreak Ends” →

Report Invasive Hemlock Insects This Winter

Posted on by akabelowsky
Small, white hemlock woolly adelgid eggs found on the needles of a tree in Bastian, Virginia, in 2017.

Small, white hemlock woolly adelgid eggs are found on the needles of a tree in Bastian, Virginia, in 2017. / Photo Credit: Bill McNee, Wisconsin DNR

By Mike Hillstrom, Forest Invasive Pest Coordinator, Fitchburg
Michael.Hilstrom@wisconsin.gov or 608-513-7690

Hemlock woolly adelgid (HWA) looms as a major threat to Wisconsin’s hemlock trees. As the infestation of these invasive, aphid-like insects spreads in Michigan and other states in the eastern United States, Wisconsin is preparing to respond when it arrives.

HWA is most evident in winter and spring as fluffy, white, woolly balls that are present at the base of hemlock needles. These fluffy, waxy balls cover adult female adelgids and eggs.

Continue reading “Report Invasive Hemlock Insects This Winter” →

Take Advantage Of Mild Winter Days To Prune Trees

Posted on by akabelowsky
An arborist uses climbing safety gear to prune an oak tree along a road.

An arborist uses climbing safety gear to prune an oak tree along a road. / Photo Credit: Wisconsin DNR

By Mike Hillstrom, Forest Invasive Pest Coordinator, Fitchburg
Michael.Hilstrom@wisconsin.gov or 608-513-7690

Winter is an ideal time to perform trimming, cutting and brush removal work on and near trees, especially oak trees.

Winter is the best time to prune because the insects and diseases that attack oak trees, such as oak wilt, are not active. Pruning and other work can be done around oak trees from after the first hard freeze in the fall until the high-risk period for oak wilt begins in April.

Continue reading “Take Advantage Of Mild Winter Days To Prune Trees” →

Stumping Heterobasidion Root Disease With Cellu-Treat®

Posted on by akabelowsky
Photo of a freshly cut tree stump after treatment with fungicide to prevent infection with Heterobasidion root disease. The fungicide is dyed blue to help ensure complete coverage.

A freshly cut tree stump after treatment with fungicide to prevent infection with Heterobasidion root disease. The fungicide is dyed blue to help ensure complete coverage. / Photo Credit: Wisconsin DNR

By Tim Shively, DNR Forest Health Specialist, Eau Claire
Timothy.Shively@wisconsin.gov or 608-772-6974

Treating freshly cut conifer stumps is critical to preventing infection by Heterobasidion species, causal agents of Heterobasidion root disease (HRD).

Within this genus, H. irregulare is believed to be the only species in Wisconsin, and it causes the mortality of overstory pine and spruce trees. The DNR has developed comprehensive guidelines to assist landowners, property managers, foresters, and loggers with determining whether stump treatments are necessary to prevent the introduction or spread of HRD at a given site.

Continue reading “Stumping Heterobasidion Root Disease With Cellu-Treat®” →

Tree City USA – Online Portal Open, No More Paper Applications!

Posted on by janness

By Laura Buntrock, DNR Urban Forestry Partnership & Policy Specialist, Laura.Buntrock@wisconsin.gov or 608-294-0253

kids holding a Tree City USA bannerThe online portal for Tree City USA (TCUSA) is now open, with applications due Dec. 31. If you’re new to TCUSA, you can learn more about the program on the Arbor Day Foundation’s (ADF) website or from your DNR Urban Forestry Coordinator. Please note that beginning this year, Arbor ADF is no longer accepting paper applications. You can create an account by clicking “sign up now” on the application portal login page. Within the online portal, you will have access to your historical data. More information is available on ADF’s FAQ page. Continue reading “Tree City USA – Online Portal Open, No More Paper Applications!” →