Statewide Forest Health

Check Conifers For Invasive Adelgids

Posted on by akabelowsky
Photo showing white, cottony hemlock woolly adelgid egg sacs on a hemlock branch.

White, cottony hemlock woolly adelgid egg sacs on a hemlock branch. / Photo Credit: Bill McNee, Wisconsin DNR

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

Hemlock woolly adelgid (HWA) and balsam woolly adelgid (BWA) are invasive, aphid-like insects that cause tree mortality in North America. Neither has been found in Wisconsin so far, but they are likely to arrive at some point, as they have been confirmed in Michigan.

HWA (Adelges tsugae) is an invasive, sucking insect pest of hemlock trees. The white, cottony egg sacs of HWA can be seen on the undersides of hemlock branches at the base of needles year-round. HWA saliva enters the tree while feeding. The saliva is toxic and causes needle drop and twig dieback, progressing to tree mortality in 4-10 years.

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Take In Wisconsin’s Beautiful Bounty Of Fall Colors

Posted on by akabelowsky
Photo of a trail at Sheboygan's Kohler-Andrae State Park with fallen leaves all around.

Fall colors set a trail at Sheboygan’s Kohler-Andrae State Park ablaze in 2021. / Photo Credit: Bill McNee, Wisconsin DNR

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

Once again, it’s time for nature’s majestic paintbrush to spread its magic across Wisconsin.

Many of the state’s trees have begun to show off their amazing fall colors, brightening the view for state residents and visitors everywhere – from the restful resplendence of our urban areas and state properties to the drive-by dazzlement of our tree-lined country roads.

“It’s a brilliant and colorful display,” said Scott Lyon, leader of the Wisconsin Department of Natural Resources Forest Products team. “The Badger State is home to many deciduous hardwood species which change colors and lose their leaves as the seasons change, including maple, oaks, hickories and aspen.”

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Gov. Evers, DNR Announce Inflation Reduction Act Urban Forestry Grant Recipients

Posted on by janness

Gov. Tony Evers, together with the Wisconsin Department of Natural Resources (DNR) today announced Urban Forestry Grant (UF) recipients, funded through the Biden-Harris Inflation Reduction Act (IRA).

“Wisconsin’s forests are a critical resource for our state, promoting clean air, preserving natural habitats, and bolstering our statewide economy,” said Gov. Evers. “Thanks to our local and federal partners, these investments help build a stronger, more resilient forestry industry, and will protect our environment and grow our economy for generations to come.”
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Japanese Beetles Finding New Locations

Posted on by akabelowsky

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

A closeup photo of Japanese beetles defoliating basswood leaves. The invasive pest is becoming more prevalent in northern Wisconsin.

A closeup photo of Japanese beetles defoliating basswood leaves. The invasive pest is becoming more prevalent in northern Wisconsin. / Photo Credit: Linda Williams, Wisconsin DNR

The Japanese beetle (Popillia japonica) is an invasive insect that feeds on many plant species. The pests “skeletonize” leaves by eating the material between the veins.

Adult Japanese beetles feed on the flowers and leaves of more than 300 plant species, including trees, shrubs and herbaceous plants. Forest trees can be defoliated, with open-grown or edge trees suffering the highest defoliation rates.

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Oak Decline Continues In Southern Wisconsin

Posted on by akabelowsky

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

Oak decline at Big Foot Beach State Park caused by flooding, drought, spongy moth defoliation, twolined chestnut borer and Armillaria. / Photo Credit: Michael Hillstrom, Wisconsin DNR

Bur and white oaks, most of them more than 100 years old, have experienced rapid mortality (within one to two years) over the past four years in southern Wisconsin and neighboring states. Research into the cause is ongoing, but the evidence so far suggests it’s an oak decline.

Oak declines are not caused by a single issue, but rather by the stacking of multiple health issues. Drought, flooding, storm damage, age, twolined chestnut borer, Armillaria and other root pathogens, and spongy moth and oak leafroller defoliation all play a role in the damage.

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Bark Beetles Infest Drought-Stressed Conifers

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

An adult bark beetle found infesting a white pine branch in 2024. / Photo Credit: Michael Hillstrom, Wisconsin DNR

Conifer mortality in southern Wisconsin has increased in 2024. Regardless of the conifer species, the common theme has been heavy infestation by bark beetles.

This increased bark beetle activity is likely linked to the 2023 drought, which lasted from May to September. Wisconsin experienced the fifth-driest May-July period on record and the fifth-driest meteorological summer (June-August) summer on record. The drought peaked during the middle of September before much-needed rain finally arrived.

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Forest Health Public Appearance Set

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

Wisconsin Department of Natural Resources Forest Health team leader Becky Gray will discuss invasives during a presentation to the Southeastern Wisconsin Invasive Species Consortium, set for Wednesday, Nov. 6, at Havenwoods State Forest in Milwaukee. / Photo Credit: Art Kabelowsky, Wisconsin DNR

Forest Health team leader Becky Gray has planned an appearance at a public meeting of the Southeastern Wisconsin Invasive Species Consortium (SEWISC). She’ll give a presentation covering invasives on a statewide level.

The event will take place from 1 to 4 p.m. Wednesday, Nov. 6, at Havenwoods State Forest, 6141 N. Hopkins St., Milwaukee, WI. More information is available on the SEWISC website.

Williams to appear at WWOA event: Linda Williams will take part in a Field Day event to discuss oak and pine issues during the four-day Wisconsin Woodland Owners Association meeting, set for Sept. 26-29 in Marshfield and Stevens Point. Four tours will take place Sept. 27; the Field Day will take place Sept. 29 at Pine Bluff Tree Farm in Stevens Point.

The event is open to the public. For more information, visit the event’s website or call 715-346-4798.

New Invasive Pest Discovered In Wisconsin

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

A closeup of an elm zigzag sawfly caterpillar consuming a leaf. The invasive insect, new to Wisconsin, was found on an elm tree near the Wisconsin Department of Natural Resources office in Oshkosh on July 16, 2024.

A closeup of an elm zigzag sawfly caterpillar consuming a leaf. The invasive insect, new to Wisconsin, was found on an elm tree near the Wisconsin Department of Natural Resources office in Oshkosh on July 16, 2024. / Photo Credit: Bill McNee, Wisconsin DNR

The invasive insect elm zigzag sawfly (Aproceros leucopada) has been detected in Wisconsin for the first time.

Following the initial Wisconsin discovery in Portage County on July 4. Through Aug. 12, the pest has since been detected in 17 Wisconsin counties. Continue reading “New Invasive Pest Discovered In Wisconsin” →

Emerald Ash Borer Confirmed In All 72 Counties

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

Closeup photo of an adult emerald ash borer. The pest has been detected in Burnett County, making it the 72nd and final county in Wisconsin that have confirmed presence of the invasive insect.

The emerald ash borer has been detected in Burnett County, making it the 72nd and final county in Wisconsin that have confirmed presence of the invasive insect. / Photo Credit: Paul Cigan, Wisconsin DNR

Sixteen years after the Wisconsin Department of Natural Resources (DNR) first detected emerald ash borer (EAB) in Wisconsin, the invasive beetle has been found in the last county without a previous detection.

Burnett County, in northwest Wisconsin, is the 72nd and final county to have a detection of the tree-killing pest.

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DNR Urban Forestry Council Welcomes New Members

Posted on by janness

The Wisconsin Department of Natural Resources (DNR)’s Division of Forestry recently welcomed two new members to the Wisconsin Urban Forestry Council and said farewell to several members who contributed much to the council. In addition, eight council members renewed their commitment for another 3-year term.

The Wisconsin Urban Forestry Council is an advisory committee to the DNR’s Division of Forestry, guiding the best ways to preserve, protect, expand and improve Wisconsin’s urban and community forest resources. The council is comprised of 23 people appointed by the Secretary of the DNR.

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