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Hemlock Borer Attacks Stressed Hemlock

Posted on by akabelowsky
Closeup photo of a hemlock borer larva feeding inside channels in a hemlock tree.

A hemlock borer larva inside channels in a hemlock tree. / Photo Credit: Steven Katovich, Bugwood.org

By Linda Williams, DNR Forest Health Specialist, Woodruff
Linda.Williams@wisconsin.gov or 920-360-0665

Woodpeckers are often the first to know that a hemlock tree is being attacked by hemlock borer.

Woodpeckers will flake off the outer layers of bark to get at the tasty hemlock borer larvae under the bark, leaving the tree with a reddish hue that, once you’ve seen it, is unmistakable. The woodpecker damage quickly makes it obvious that the tree was fully infested from top to bottom by hemlock borer.

Continue reading “Hemlock Borer Attacks Stressed Hemlock” →

Be Mindful Of Invasives During Holiday Clean-Up

Posted on by akabelowsky
A stack of discarded Christmas trees awaits processing at a drop-off facility.

A stack of discarded Christmas trees awaits processing at a drop-off facility. / Photo Credit: Wisconsin DNR

By Wisconsin DNR

Invasive plants and insects don’t mind playing the long game. After all, they’re just trying to survive and thrive, like the rest of us.

They’ll hang out as part of your holiday decorations throughout the season, just on the chance humans might dispose of them improperly, giving them an opportunity to find a new home in your yard or neighborhood.

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Community Spotlight: Rhinelander — How One Small Community Is Making Urban Forestry A Priority

Posted on by janness

By Tom Jerow, Rhinelander City Forester

View of the same street before and after urban forestry efforts.

The City of Rhinelander, like many communities with populations under 10,000, has struggled to maintain a vibrant urban forestry program. Funding and staffing are its main challenges. The city also faces a variety of urban forestry issues, including pests and diseases, species diversity, community engagement, catastrophic ice storms and aging sewer and water infrastructure. The latter is one of the most significant challenges. Continue reading “Community Spotlight: Rhinelander — How One Small Community Is Making Urban Forestry A Priority” →

Repurpose Your Holiday Tree!

Posted on by janness

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

To say that working on a Christmas tree farm in high school led me into forestry would be a case of significant historical revisionism. Still, that experience swam in the same waters as reading Lord of the Rings, going on family vacations to the mountains, having a nearby municipal forest and other things that showed me that trees were the way.

Since then, I have increasingly appreciated holiday trees and other green things brought into households, not (just) in the harbinger-of-gifts way, but as reminders of life against a cold, seemingly bleak background. “Things will get better,” these green things announce. “Just wait!” Continue reading “Repurpose Your Holiday Tree!” →

White Pine Blister Rust Can Devastate Young Stands

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

A close-up photo of a white pine blister rust canker as seen on a young white pine tree.

A white pine blister rust canker as seen on a young white pine tree. / Photo Credit: Wisconsin DNR

Eastern white pine (Pinus strobus) has historically held great ecological, cultural and economic value throughout Wisconsin, a tradition which continues today. For more than 100 years, however, it has been threatened by a non-native, invasive fungal pathogen called Cronartium ribicola, or white pine blister rust (WPBR).

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Impacts Of Winter Weather On Trees

Posted on by akabelowsky

By Michael Hillstrom, DNR Forest Health Specialist
Michael.Hillstrom@wisconsin.gov

A stand of pines shows heavy damage from an ice storm in April 2025.

A stand of pines shows heavy damage from an ice storm in April 2025. / Photo Credit: Wisconsin DNR

Winter damage can significantly impact the health of trees. Keeping trees healthy through the fall is important for reducing winter stress. Provide water as needed to trees until the leaves start falling (for deciduous trees) or until the ground starts freezing (for conifers).

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DNR, DATCP Teams Exemplify Interagency Teamwork

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

Wisconsin Department of Natural Resources Forest Health team leader Becky Gray and Department of Agriculture, Trade and Consumer Protection Pest Survey and Control Section manager Renee Pinski appear before the Natural Resources Board to discuss tree and forest health issues on Nov. 13, 2025.

Wisconsin Department of Natural Resources Forest Health team leader Becky Gray (left) and Department of Agriculture, Trade and Consumer Protection Pest Survey and Control Section manager Renee Pinski appear before the Natural Resources Board to discuss tree and forest health issues on Nov. 13, 2025. / Photo Credit: Wisconsin DNR

The spirit of interagency communication was on display during a joint meeting of the Wisconsin Natural Resources Board (NRB) and the Wisconsin Board of Agriculture, Trade and Consumer Protection (Ag Board) on Nov. 13.

The seven-member NRB is the governing body of the Wisconsin Department of Natural Resources (DNR); the nine-member Ag Board governs the Wisconsin Department of Agriculture, Trade and Consumer Protection (DATCP). Each board sets policies and rules to be followed and enforced by its respective agencies. Members of both boards are appointed by the governor and confirmed by the Wisconsin State Senate.

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Forest Health Staffers Hit The Airwaves

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Photo of Mike Hillstrom, who became the Wisconsin Department of Natural Resources Invasive Forest Pest Coordinator on Sept. 9, 2024.

Mike Hillstrom became the Wisconsin Department of Natural Resources Invasive Forest Pest Coordinator on Sept. 9, 2024. / Photo Credit: Wisconsin DNR

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

Mike Hillstrom and Bill McNee, members of the Wisconsin Department of Natural Resources’ Forest Health team, made notable radio appearances during November.

Hillstrom, the DNR’s invasive forest pest coordinator, appeared on Wisconsin Public Radio to discuss the invasive pest hemlock woolly adelgid (HWA). The insect has not yet established a presence in Wisconsin.

Continue reading “Forest Health Staffers Hit The Airwaves” →

Go-To Online Resources For Urban Forestry

Posted on by janness

By Allen Pyle, UW-Extension Horticulture Outreach Specialist and Jay Dampier, DNR IRA Grant Coordinator, Jason.Dampier@wisconsin.gov or 920-765-1935

Reliable and up-to-date research-based information is vital for tree care professionals and urban foresters to make sound, scientific management decisions. To make trusted resources more accessible, UW-Extension’s Horticulture Program and Wisconsin DNR’s Urban Forestry Program have developed this curated selection of useful webpages with free information and resources for urban forestry professionals and community tree managers. Continue reading “Go-To Online Resources For Urban Forestry” →

Fourth Grade Arbor Day Seedling Orders Now Open

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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” →