Technical assistance

Katie Hill Grows Into West Central FH Technician Role

Posted on by akabelowsky
Katie Hill, head and shoulders

Katie Hill has been named the Wisconsin Department of Natural Resources Forest Health technician for West Central Wisconsin. / Photo Credit: Wisconsin DNR

By Art Kabelowsky, DNR Outreach and Communications, Fitchburg;
Arthur.Kabelowsky@wisconsin.gov or 608-335-0167

As a youngster, Katie Hill found her future outdoors.

Now, as she steps in as the Wisconsin Department of Natural Resources (DNR)’s Forest Health technician for West Central Wisconsin, she continues working to turn those early goals into reality.

Continue reading “Katie Hill Grows Into West Central FH Technician Role” →

Resources For Storm-Damaged Trees

Posted on by janness

By Olivia Witthun, DNR Urban Forestry Coordinator
Olivia.Witthun@wisconsin.gov or 414-750-8744

storm-damaged treeWith recent storms passing through Wisconsin, communities may still be working on clean-up. Depending on the intensity of the storms and the condition of the trees, damage from high winds, heavy rainfall, hail and lightning can be quite severe. Cracked or broken branches, trunk damage and root failure are some of the main concerns, but also the risk and liability of damage to people and property.

Did your community experience damage from the storms that passed through the state recently? The list below contains resources individuals and communities may find useful. Feel free to include any of these links on your website or in social media posts. Continue reading “Resources For Storm-Damaged Trees” →

Upcoming Training & Events

Posted on by janness

group of people learning to plant a tree* These training opportunities are provided as an information service only and do not constitute endorsement by the Wisconsin Department of Natural Resources (DNR).

See below for information on training topics and events including i-Tree, American elm research, oak health issues, invasives and private equity. Continue reading “Upcoming Training & Events” →

Fungicide For HRD Stump Treatment Available In Smaller Size

Posted on by akabelowsky

A bag of Tim-bor Professional, a borate-based chemical that fights Heterobasidion root disease. / Photo Credit: Wisconsin DNR

By Kyoko Scanlon, Forest Pathologist, Fitchburg
Kyoko.Scanlon@wisconsin.gov

People who have been dealing with Heterobasidion Root Disease (HRD) may be familiar with the product name “Cellu-Treat®.” It has been used to treat fresh cut stumps to prevent HRD.

But Cellu-Treat® is not the only chemical available for HRD. Another borate-based chemical, Tim-bor® Professional, can also be used legally for the same purpose in Wisconsin. Both products are manufactured by Nisus Corporation, and their labels are almost identical (Cellu-Treat label, Tim-bor label).

Continue reading “Fungicide For HRD Stump Treatment Available In Smaller Size” →

Cooperative Hemlock Woolly Adelgid Trapping Effort Begins

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A 3-D printed trap used to collect hemlock woolly adelgid DNA. / Photo Credit: Wisconsin DNR

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

This spring, the Wisconsin Department of Natural Resources (DNR) is collaborating with the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP) to set traps to detect the invasive insect hemlock woolly adelgid (Adelges tsugae; HWA).

The project, funded by the Wisconsin Specialty Crop Block Grant Program, calls for traps to be set to detect the invasive insect. No detection of HWA has been made to date in Wisconsin forests. Continue reading “Cooperative Hemlock Woolly Adelgid Trapping Effort Begins” →

Yard Tree Owners, Send In Your Questions

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The niversity of Wisconsin-Madison Division of Extension Horticulture Program's webpage for "Ask A Gardening Question."

The University of Wisconsin-Madison Division of Extension Horticulture Program’s webpage for “Ask A Gardening Question,” the best place for homeowners to ask questions about the health of their yard trees. / Graphic Credit: UW-Madison Division of Extension

By Art Kabelowsky, DNR Forest Health Outreach and Communications, Fitchburg; Arthur.Kabelowsky@wisconsin.gov or 608-335-0167

The Wisconsin Department of Natural Resources (DNR) has a team of Forest Health specialists that focus on problems affecting state, county and municipal forests and private forests larger than 10 acres.

But, to twist a cliché, if you can’t see the forest for the trees when it comes to your yard trees, expert help is a few clicks away.

Continue reading “Yard Tree Owners, Send In Your Questions” →

Increased Tree Mortality Seen As Spongy Moth Outbreak Ends

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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” →

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 Inventory Subaccounts Available Within Wisconsin Community Tree Map

Posted on by janness

By Dan Buckler, DNR Urban Forest Assessment Specialist; Daniel.Buckler@wisconsin.gov or 608-445-4578

Do you have a tree inventory but have a hard time keeping it up to date? Or are you interested in inventorying trees from scratch?

The Department of Natural Resources (DNR) has made a handful of “subaccounts” available for communities or organizations to edit data within the Wisconsin Community Tree Map at no cost to the community or organization.

Continue reading “Tree Inventory Subaccounts Available Within Wisconsin Community Tree Map” →

American Forests Launches Tree Equity Coaching Network

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American Forests LogoThe  American Forests National Coaching Network is a community for urban foresters, community advocates, city leaders and allied professionals to connect, learn, inspire and cultivate city commitments to advance tree equity. This network is a way for people to address challenges and build their tools and resources. Continue reading “American Forests Launches Tree Equity Coaching Network” →