Care for your woods

Oak Moth Outbreaks May Have Peaked In North

Posted on by akabelowsky

By Paul Cigan, DNR Forest Health Specialist, Hayward;
Paul.Cigan@wisconsin.gov or 715-416-4920

Wide-angle photo showing many oaks across northern Wisconsin with partially defoliated, thin, and yellow-tinted crowns caused by defoliation from the oak leafroller and oak leaftier.

Many oaks across northern Wisconsin displayed partially defoliated, thin, and yellow-tinted crowns caused by defoliation from the oak leafroller and oak leaftier. / Photo Credit: Paul Cigan, Wisconsin DNR

A three-year-long outbreak of oak leafroller moth and oak leaftier moth—two native, early-season oak defoliators—continued this spring in northern Wisconsin, leaving behind tens of thousands of acres of oak-dominated forest with scattered, widespread defoliation.

Partially defoliated, thin and yellow-tinted crowns were visible across portions of Barron, Rusk, Sawyer and Washburn counties, as well as areas in Florence, Forest, northern Marinette and Vilas counties.

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Spongy Moth Status Update

Posted on by akabelowsky

By Bill McNee, DNR Forest Health Specialist, Oshkosh;
Bill.McNee@wisconsin.gov or 920-360-0942

A photo showing several trees with spongy moth defoliation in Marinette County in mid-June 2024.

Spongy moth defoliation in Marinette County in mid-June 2024. / Photo Credit: Darrek Sams, Wisconsin DNR

As of early July, we have seen a mix of live and dead caterpillars and tree defoliation that is typical of a late-stage spongy moth outbreak. Reports of defoliation have been received as far north as Florence County.

Recent aerial surveys in southern Wisconsin spotted defoliation in the same general areas as in 2023, but the defoliation has generally been less intense this year. Information for northern Wisconsin has yet to be made available. Refoliating oaks, growing a second set of pale-looking leaves, were seen in Walworth County in early July.

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Pruning Can Control White Pine Blister Rust

Posted on by akabelowsky

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

Eastern white pines (Pinus strobus) can be beautiful trees in urban and forested areas (they can tower above the rest of the forest’s trees), but they can also attract a deadly disease.

White pine blister rust (Cronartium ribicola), also known as WPBR, is a fungus that can attack branches and the main stem of white pine, causing cankers that continue to grow each year and creating dead spots that can girdle branches or the main stem. Damage from a girdling canker may take years to become severe enough to cause tree decline and mortality. That means you may be able to help your trees and prevent mortality.

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Best Disposal Methods For Garlic Mustard

Posted on by akabelowsky

By Erika Segerson-Mueller, DNR Invasive Plant Program Specialist, Oshkosh Service Center
Erika.SegersonMueller@wisconsin.gov or 715-492-0391

Summer can be prime time for invasive plant control, with garlic mustard pulls and many other plant- or location-specific events taking place to confront invasive plants head-on.

Wanting to do your best to help, you might pull garlic mustard along your local hiking trail. But what should you do after you pull it?

Read on for invasive plant disposal tips to ensure you don’t inadvertently do more harm than good with your control efforts.

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Invasives Get The Spotlight On Madison TV

Posted on by akabelowsky

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

The fight against invasive plant species in Wisconsin’s forests, woods and natural areas got a big boost over the airwaves in June.

WISC-TV (Channel 3 in Madison) produced a news feature on invasives that included an interview and tour with Wisconsin Department of Natural Resources (DNR) invasive plant specialist and Natural Heritage Conservation representative Mackenzie Manicki.

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Spongy Moth Egg Mass Surveying Video Released

Posted on by akabelowsky

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) Forest Health team joined with the DNR Office of Communications to produce an instructional video aimed at helping large landowners and land managers in the fight against spongy moth.

The video, less than 2 minutes in length, shows how to conduct a survey of spongy moth egg masses in the fall. With that information, people can predict how much damage to expect from the caterpillars in the spring, giving them time to make advance plans for the most effective control options.

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DNR Debuts Fact Sheet On Twolined Chestnut Borer

Posted on by akabelowsky

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

The Wisconsin Department of Resources (DNR) has debuted a new Forest Health fact sheet on twolined chestnut borer (Agrilus bilineatus), a native beetle that attacks already weakened oaks in Wisconsin.

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2025 DNR Urban Forestry Grant Application Opening Soon

Posted on by janness

Urban Forestry grant applications are opening soon!

Beginning July 1, 2024, cities, villages, towns, counties, tribes and 501(c)(3) nonprofit organizations in –or conducting their projects in – Wisconsin can apply for a regular or startup 2025 Wisconsin Department of Natural Resources (DNR) Urban Forestry grant. The total 2025 available funding is $559,680, with a possible release of $139,920 of catastrophic storm reserve to fund a second round in March 2025. Continue reading “2025 DNR Urban Forestry Grant Application Opening Soon” →

WAA Summer Conference And Tree Climbing Competition July 26-28

Posted on by janness

Join the Wisconsin Arborist Association (WAA) for its summer conference. It will be held at the University of Wisconsin-River Falls University Center in River Falls, Wisconsin, on Friday, July 26, 2024. The program will have a little something for everyone, Planting for the Future and feature two educational tracks, one indoors and one outdoors.

Topics include:

  • Storm damage to trees
  • Construction project management
  • Tree stress and management
  • Tree diversity options
  • Mentoring the new generation
  • Training new climbers
  • Company training
  • Aerial lift to climbing transitions
  • Drone applications

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Weather Whiplash Affects Pine Stands

Posted on by akabelowsky
Swath of dead pine due to high water table mortality

A swath of pine dead due to high water table mortality in 2020 in northeast Wisconsin.

By Alex Hornung, DNR Forest Health Specialist, Plover;
Alexandra.Hornung@wisconsin.gov

Many pine stands across central and northeast Wisconsin are being impacted by the change from high levels of precipitation to extreme drought that has occurred over the last 5-7 years.

Drastic or sudden changes can be particularly stressful to trees of all species, but especially to pine stands that prefer well-drained soil types.

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