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Emerald Ash Borer Detected In Rusk County

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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

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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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Pine Bark Adelgids Infest White Pines

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Photo of pine bark adelgids covered in white, waxy fluff on a white pine tree.

Pine bark adelgids covered in white, waxy fluff on a white pine tree. / Photo Credit: Wisconsin DNR

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

Pine bark adelgids are tiny, aphid-like insects that suck the sap of white pines. The bugs protect themselves from predators with a fluffy, white wax covering. Pine bark adelgids generate concern when thousands of them gather on white pines to feed, making the pine bark appear covered with sap.

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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

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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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Balsam Fir Mortality Similar To 2018 And 2020

Posted on by akabelowsky
Picture of dying balsam fir in Northwoods of Wisconsin.

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

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

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

These symptoms are similar to those observed in 2018 and 2020. So far, the number of impacted trees reported is smaller than what was seen in 2018 or 2020. While reports of affected trees are still coming in, they seem to be concentrated in northern areas of the state that experienced extensive snowfall in late winter.

Continue reading “Balsam Fir Mortality Similar To 2018 And 2020” →

Hemlock Being Defoliated By Spruce Budworm

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Photo of spruce budworm eating hemlock needles.

Spruce budworm defoliation this spring on hemlock makes the trees look thin. Photo Credit: Linda Williams, Wisconsin DNR

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

Spruce budworm is finished feeding for the year, but the damage from the insects is still being observed.

Spruce budworm prefers to feed on balsam fir and spruce, but a previous newsletter article noted that tamarack had been observed as 100% defoliated by spruce budworm. More recently, stands of hemlock with moderate to severe defoliation were also identified.

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Forest Health Team Offers Seven New Fact Sheets, Updates Website

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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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Basswood Thrips Causing Crumpled Leaves, Thin Crowns

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

Photo of basswood leaves damaged by basswood thrips.

Basswood leaves show damage after feeding of introduced basswood thrips. / Photo Credit: Wisconsin DNR.

For the second consecutive year, damage from introduced basswood thrips (Thrips calcaratus) is significant in some northeastern Wisconsin counties. Introduced basswood thrips are tiny, invasive insects that feed inside tree buds in early spring. Leaves are then deformed when they expand and can look like frost or wind has damaged them.

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