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Species Spotlight: Japanese Honeysuckle

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Japanese honeysuckle climbing up nearby trees. / Photo Credit: Leslie J. Mehrhoff, University of Connecticut, Bugwood.org

By Carter Hellenbrand, DNR Invasive Plant Field Specialist, Fitchburg
Carter.Hellenbrand@Wisconsin.gov  

Note: This is the first installment in the Forest Health News “Invasives Spotlight” series, a monthly series of Forest Health News articles.

Many people recognize honeysuckle as a fast-spreading invasive shrub that can quickly displace native vegetation. But did you know that some honeysuckles exist as a vine?

Japanese honeysuckle (Lonicera japonica) is an invasive perennial vine that can grow to a length of 80 feet or longer. Birds will often eat and disperse the berries the vine produces, allowing for the creation of new populations.

Continue reading “Species Spotlight: Japanese Honeysuckle” →

Take Precautions to Prevent Tick Bites

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An adult deer tick looks for a spot to attach. / Photo Credit: Wisconsin DNR

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

Adult blacklegged (deer) ticks are already active this year, as of March 2026. The adults start looking for a host as soon as it warms up to around 40 degrees Fahrenheit.

In Wisconsin, between 20-60 percent of adult ticks are infected with the bacteria that causes Lyme disease. However, the risk of getting Lyme disease is higher with bites from nymphal ticks, which are most abundant in June and July, because they are so tiny and difficult to find. While only 10-28 percent of nymphs are infected with the Lyme disease bacteria in Wisconsin, rapid removal of a tick can reduce the risk of infection because it takes at least 24 hours for the Lyme bacteria to spread.

Continue reading “Take Precautions to Prevent Tick Bites” →

Campers Reminded: Don’t Move Firewood

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A self-service firewood point of sale at Mirror Lake State Park in Sauk County. / Photo Credit: Wisconsin DNR

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

With camping season about to enter full swing, the Wisconsin Department of Natural Resources (DNR) urges campers to think twice before giving invasive species or harmful hitchhikers a ride in their firewood.

Memorial Day marks the unofficial start of summer, and campfires are a Wisconsin summer staple. And campers should know it’s a big help to the state’s trees when they help to prevent the spread of invasive pests by making smart firewood choices.

Continue reading “Campers Reminded: Don’t Move Firewood” →

Governor Plants Seeds Of Celebration For Wisconsin’s Forests

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Wisconsin Gov. Tony Evers (second from right) joins educators working with the Lodi School Forest during a tree planting event on Arbor Day 2026.

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

Wisconsin Governor Tony Evers didn’t have to go out on a limb to make this announcement.

By issuing a Governor’s Proclamation last month, Gov. Evers has shined a spotlight on Wisconsin’s 17 million acres of forestland. His announcement officially recognized Wisconsin’s participation in Forest Appreciation Week and Arbor Day.

Continue reading “Governor Plants Seeds Of Celebration For Wisconsin’s Forests” →

Forest Health Specialist Paul Cigan Spreads The News

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Paul Cigan (in black hat) discusses the health of a tree with fellow Wisconsin Department of Natural Resources Forest Health specialists Bill McNee and Linda Williams in Cambridge. / Photo Credit: Wisconsin DNR

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

Paul Cigan, the Wisconsin Department of Natural Resources Forest Health specialist for Northwest Wisconsin, has planned a public discussion for Tuesday, June 30, in Ashland.

Cigan will give a presentation on “Invasive Insects and Diseases” and take questions from those in attendance at the event, set for 6 p.m. June 30 at the Northern Great Lakes Visitors Center, 29270 County Hwy. G, Ashland.

Continue reading “Forest Health Specialist Paul Cigan Spreads The News” →

Governor Plants Seeds Of Celebration For Wisconsin’s Forests

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Wisconsin Governor Tony Evers speaks to a group after a tree planting to celebrate Arbor Day.

Wisconsin Gov. Tony Evers speaks at a 2025 Forest Appreciation Week and Arbor Day tree-planting event in Green Bay. The governor assisted in the planting of 15 large shade trees as part of Wisconsin’s participation in the Trillion Trees Pledge. / Photo Credit: Wisconsin DNR

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

Wisconsin Governor Tony Evers didn’t have to go out on a limb to make this announcement.

By issuing a Governor’s Proclamation this week, Gov. Evers has shined a spotlight on Wisconsin’s 17 million acres of forestland. His announcement officially recognizes Wisconsin’s participation in Forest Appreciation Week and Arbor Day.

“Wisconsin’s trees and forests are among the state’s most beautiful and critical natural resources,” Gov. Evers wrote, “and educating kids, families and communities about sustainable forestry is vital to their long-term conservation.”

Continue reading “Governor Plants Seeds Of Celebration For Wisconsin’s Forests” →

Aerial Spraying For Spongy Moth Planned at Perrot State Park

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A map showing the area to be covered by a 2026 aerial spray for spongy moth caterpillar control at Perrot State Park.

A map showing the 2026 spongy moth caterpillar aerial spraying area planned for Perrot State Park in Trempealeau County. / Map Credit: Wisconsin Department of Agriculture, Trade and Consumer Protection.

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

This spring, a portion of Perrot State Park in Trempealeau County will be aerially treated for spongy moth with “Foray” bacterial insecticide, containing Bacillus thuringiensis var. kurstaki.

A reproducing population of the leaf-eating caterpillar was detected in the park last fall, leading to the decision to conduct aerial spraying in 2026.

Continue reading “Aerial Spraying For Spongy Moth Planned at Perrot State Park” →

April Brings Celebration of Wisconsin’s Forests

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An overhead view of a group of children kneeling in a circle while planting a tree.

A group of children in Cedarburg gathers to plant a tree as part of an Arbor Day observance. / Photo Credit: Wisconsin DNR

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

It takes more than one celebration to pay tribute to Wisconsin’s 17 million acres of rich, diverse forestland.

So, the state has come up with multiple ways to acknowledge the value of trees to Wisconsin’s ecology, economy, health and way of life. Three of the biggest ones are taking place in April:

  • Earth Day will be observed on Wednesday, April 22.
  • Arbor Day is set for Friday, April 24.
  • Forest Appreciation Week runs April 20-24 statewide, covering both of those dates.

Continue reading “April Brings Celebration of Wisconsin’s Forests” →

Video Explains Importance Of Oak Wilt Prevention

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A frame-grab from the Wisconsin DNR's video explaining the tree disease oak wilt.

Landowner Montgomery Mouw and DNR Forest Health specialist Linda Williams inspect oaks as part of a DNR video explaining the disease oak wilt. / Photo Credit: Wisconsin DNR

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

Owners of oak trees, the time for caution is now.

Your oaks are at risk of oak wilt infection if they undergo pruning work or are damaged —even inadvertently — between April and mid-July.

Continue reading “Video Explains Importance Of Oak Wilt Prevention” →

‘Exploding Trees’ Face Long-term Impacts

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A long vertical wound in a tree trunk caused by deep freezing.

Cracked bark and wood creates a long vertical wound typical of the phenomenon commonly called “exploding trees.” / Photo Credit: Wisconsin DNR

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

This past winter, “exploding trees” went viral on social media. Many news outlets followed up with a more realistic explanation of the dramatically named phenomenon, pointing out that while the bitter cold can cause sudden cracks to form on trees, the trees don’t truly explode.

But what happens to those damaged trees as we warm up and move into the growing season?

Continue reading “‘Exploding Trees’ Face Long-term Impacts” →