Care for your woods

Emerald Ash Borer Detected In Rusk County

Posted on by akabelowsky

By Paul Cigan, DNR Forest Health Specialist, Hayward
Paul.Cigan@wisconsin.gov or 715-634-9232

Photo of an emerald ash borer on a tree

Emerald ash borer was detected in Rusk County in northwest Wisconsin in late July, making it the 69th of Wisconsin’s 72 counties that have confirmed presence of the invasive insect. / Photo Credit: Paul Cigan, Wisconsin DNR

The emerald ash borer (EAB) has been detected for the first time in Rusk County, making it the 69th of Wisconsin’s 72 counties to determine the presence of the invasive insect.

On July 25, Wisconsin Department of Natural Resources Forest Health staff investigated a report of several ash trees with woodpecker flecking and branch dieback in a village park along Railroad Avenue in the Village of Sheldon.

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Don’t Spread Invasive Plants This Hunting Season

Posted on by akabelowsky

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

Photo of a hunter walking through a field.

Whether you are headed out to a tree stand in your favorite local forest or a duck blind on the shore of your nearby pond, you can take a few easy precautions to help minimize the spread of invasive plants in your favorite hunting spots. / Photo Credit: NAISMA.org

Heading out to your tree stand or hunting blind this fall? Avoid adding invasive species to your hunting party by taking a few simple steps to help protect your woods.

Non-native invasive plants often outcompete native plants in forest environments, degrading diversity and destroying wildlife habitat. Invasive plants can replace local forest species and may interfere with or decrease tree regeneration. They may take over woodlands, prairies and wetlands, and many provide ideal habitats for pests that harm wildlife and people alike.

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Balsam Fir Mortality Similar To 2018 And 2020

Posted on by akabelowsky

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

Photo of balsam fir tree prematurely turning brown and red.

Scattered balsam fir trees in the Northwoods have suddenly turned brown and red this spring. / Photo Credit: Linda Williams, Wisconsin DNR

Scattered balsam fir trees in some areas of northern Wisconsin have suddenly turned rusty red to brown and are dying. These trees are not being impacted by spruce budworm and typically die with a full complement of needles.

The symptoms resemble what was observed in 2018 and 2020. So far, the number of trees being reported is smaller than what was seen in 2018 or 2020. Reports are still coming in, but they seem to be concentrated in northern areas of the state where we had extensive snowfall in late winter.

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Yard Waste: Not For The Woods

Posted on by akabelowsky

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

Photo of garden waste dumped along an ATV trail in a Wisconsin state forest.

This garden waste was dumped along an ATV trail in a state forest and can be a pathway for invasive plants and diseases that affect our public lands. / Photo Credit: Wisconsin DNR

When a pile of more than 500 pounds of uncooked pasta was found in the woods in New Jersey in early May, no one was quite sure why or how the piles had appeared — but it was clear that they didn’t belong there.

Whether spaghetti noodles, broken electronics or old furniture, some things shouldn’t be in our woods, waters or roadsides, no matter the reason.

Though it may seem obvious that you should avoid dumping these types of waste in your local woods, some items aren’t as straightforward.

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Spongy Moth Update: State Defoliation Record Set

Posted on by akabelowsky
Photo of spongy moth laying a tan-colored egg mass on an oak tree.

A female spongy moth lays a tan-colored egg mass on an oak tree at the Kettle Moraine State Forest – Southern Unit on July 25. Photo Credit: Bill McNee, Wisconsin DNR

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

In many areas across Wisconsin, conditions were right for the worst outbreak of spongy moth caterpillars (Lymantria dispar) in more than a decade.

The caterpillars of this invasive insect — formerly known as gypsy moth — prefer to feed on oak, birch, crabapple, aspen and willow leaves, but will also feed on many other tree and shrub species. As of early August, caterpillars have pupated, but adult moths remain present.

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Forest Health Team Offers Seven New Fact Sheets, Updates Website

Posted on by akabelowsky
A preview of the new Wisconsin Department of Natural Resources Forest Health fact sheet on spongy moth.

A preview of the new Wisconsin Department of Natural Resources Forest Health fact sheet on spongy moth. Graphic Credit: Wisconsin DNR

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

The Wisconsin Department of Natural Resources’ (DNR) Forest Health team has debuted seven new fact sheets, providing information on various forest insects and diseases as well as tips on how to deal with their emergence on your property.

The new fact sheets provide details on spongy moth, oak wilt management, spruce budworm, jack pine budworm, tamarack insects (larch casebearer and eastern larch beetle), red pine pocket decline and mortality and a comparison of common spring defoliator caterpillars (forest tent caterpillar, eastern tent caterpillar and spongy moth).

Additionally, the Forest Health team has updated and/or refreshed the look of its 13 existing fact sheets.

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Upcoming Environmental Justice Webinars

Posted on by patricialindquist

The Arbor Day Foundation and the Chicago Region Trees Initiative are each hosting an environmental justice webinar next week.

On Tuesday, July 18, from 11 a.m. – noon, the Arbor Day Foundation is presenting Environmental Justice in Tree Cities: Where to Begin? A conversation with Dr. Christine Carmichael of Fair Forests Consulting for the Tree City USA network. In this webinar, attendees will learn the defining characteristics of environmental justice, evidence of environmental injustices in urban and community forestry, and strategies to integrate environmental justice principles into their Tree City USA programs.

If you, your organization, your city or town are new to environmental justice concepts and practices, this webinar will equip you with tangible next steps to advance your efforts, including ways to measure your success and adapt as needed along the way. 

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Acorn Pip Galls, Woolly Catkin Galls All The Same

Posted on by akabelowsky

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

Photo of acorns showing small pip galls.

Pip galls are small, tongue-like protrusions emerging from under the caps of acorns. / Photo Credit: Linda Williams, Wisconsin DNR.

Gall wasp life cycles can be complex. Did you know that acorn pip galls, which I’ve written about several times, have another part of their life cycle that is entirely different? This stage is called the woolly catkin gall.

Both woolly catkin galls and acorn pip galls are caused by Callirhytis quercusoperator, a species of cynipid gall wasp. This gall wasp takes two years to complete development by going through the two parts of its life cycle. Both parts of the life cycle are completed on northern red oak in our area.

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High Beech Scale Moving Beyond Door County

Posted on by akabelowsky

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

and Linda Williams, DNR Forest Health Specialist, Woodruff; linda.williams@wisconsin.gov or 920-360-0665

Photos of white 'wool' coating on trees with beech scale.

Examples of white “wool” coating on trees heavily infested with beech scale at Kohler-Andrae State Park (left) and in the Town of Beecher in Marinette County (right). / Photo Credit: Bill McNee (left) and Linda Williams (right), Wisconsin DNR.

Fourteen years after first detecting beech scale (Cryptococcus fagisuga, a non-native insect) in Door County, sites with high populations of beech scale have been found in additional counties. Beech scale is believed to have spread through the range of American beech in Wisconsin’s eastern counties, but until now has only been seen at low levels outside of Door County.

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White Pine Weevil Damage And Management Options

Posted on by akabelowsky

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

Photo of a white pine tree showing weevil damage.

A dead terminal leader, resulting from an attack by white pine weevil. Photo: Linda Williams, Wisconsin DNR.

White pine weevil (Pissodes strobi) is a native insect that can kill the terminal leader of white pine, jack pine and spruce. Wisconsinites often refer to this insect as Tip Weevil.

The insects prefer to attack stout terminal leaders. When the terminal leader dies, lateral branches grow upward and compete to take over apical dominance. This can leave a noticeable crook for decades. If two or more lateral branches take over, forking can occur. New terminal leaders may be attacked in subsequent years, causing more crook or forking.

Spruce and jack pine tend to recover better from weevil damage than white pine because the lateral branch that takes over apical dominance often creates a less prominent crook.

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