Urban Forestry News

Is That A Crack In My Tree?

Posted on by janness

By Olivia Witthun, DNR Urban Forestry Coordinator
Olivia.Witthun@wisconsin.gov or 414-750-8744

tree with frost crackWisconsin winters with subzero weather can create problems for our trees. Frost cracks are one of those problems we’re seeing an uptick of lately. These longitudinal openings can run the entire length of the trunk, often extend deep into the wood, and permanently damage a tree. In wintertime, the tree may even look like it’s splitting in half! Then warmer weather comes, and the crack seems to close, repeating this process annually. Over time, frost cracks may even develop a raised area where callus tissue develops in an attempt to close over the wound, only to reopen again next winter. Continue reading “Is That A Crack In My Tree?” →

Post Your Forestry Jobs For Free

Posted on by janness

Have a job opening you need to get the word out about before the busy field season ramps up?

The UW-Stevens Point’s Wisconsin Forestry Center welcomes employers to send in their job openings using this email: wfc@uwsp.edu. Web links are preferred, but PDFs are also acceptable. Be sure to include job title, type of employment (full-time, part-time, temporary, internship, etc.), location and application due date. There is no cost for posting openings. Continue reading “Post Your Forestry Jobs For Free” →

Run For The Trees

Posted on by janness

Now is the time to sign up for Run for the Trees: Happy Little (Virtual) 5K! Run, walk or roll to support tree planting and forest protection efforts in state parks. The program was started in 2019 when Bob Ross Inc. partnered with the Michigan Department of Natural Resources to raise awareness of and money for tree planting and has since expanded to 13 states. Continue reading “Run For The Trees” →

A Wonderful Winter Display: Phomopsis Galls

Posted on by akabelowsky
Phomopsis galls are plentiful on branches of a 120-year-old red oak tree in Clark County, Wisconsin, in 2024.

Phomopsis galls are plentiful on branches of a 120-year-old red oak tree in Clark County, Wisconsin, in 2024. / Photo Credit: Kris Wimme, retired Wisconsin DNR forester

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

It is the perfect time of year to be on the lookout for galls – woody growths or swellings on tree branches that are typically oblong in shape and of varying sizes.

They can often be found on small branches, but occasionally they can affect large branches or even the main stem. Galls can occur for several reasons, ranging from fungi to bacteria to insect activity.

One type, Phomopsis gall, can be particularly impressive to see. Galls formed due to this native fungus mostly occur on oak, hickory and maple trees in Wisconsin.

 

Continue reading “A Wonderful Winter Display: Phomopsis Galls” →

Frost’s Bite: How Do Insects Survive Winter?

Posted on by akabelowsky
An emerald ash borer larva overwinters by curling into a J shape inside a channel in an ash tree in Brookfield in 2019.

An emerald ash borer larva overwinters by curling into a J shape inside a channel in an ash tree in Brookfield in 2019. / Photo Credit: Bill McNee, Wisconsin DNR

By Michael Hillstrom, DNR Forest Health Specialist, Fitchburg

Michael.Hillstrom@wisconsin.gov

As winter’s chill persists, Wisconsin Department of Natural Resources (DNR) Forest Health staff members are often asked how cold it needs to get to kill insects, especially invasives.

The answer varies from species to species, but many insects are well adapted to dealing with freezing winter temperatures. Some, such as monarchs, avoid the issue and migrate south for the winter. Others, such as multicolored Asian ladybeetles, annoy us with their presence in our homes and offices as they try to avoid the cold until spring.

Continue reading “Frost’s Bite: How Do Insects Survive Winter?” →

Now Is Time To Seek Out Spongy Moth Egg Masses

Posted on by akabelowsky
Large egg masses are seen on a tree at the Kettle Moraine State Forest-Southern Unit in 2021.

Large egg masses are seen on a tree at the Kettle Moraine State Forest-Southern Unit in 2021. / Photo Credit: Bill McNee, Wisconsin DNR

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

It might be a bit chilly these days, but spring is coming. When the weather warms up, the annual return of spongy moth caterpillars will begin.

There’s a way for landowners to make a dent in the population of the hungry caterpillars: Get out now to locate and properly dispose of spongy moth egg masses, produced by adult moths last summer.

Continue reading “Now Is Time To Seek Out Spongy Moth Egg Masses” →

What Are Those White Fluffies On Trees?

Posted on by akabelowsky
Lots of beech scale, covered in white wool, makes this tree’s bark look fluffy.

Lots of beech scale, covered in white wool, makes this tree’s bark look fluffy. / Photo Credit: Linda Williams, Wisconsin DNR

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

Last month, we introduced readers to the woolly alder aphid, which is easier to spot in the winter as the insects congregate on alder branches and grow strands of white, waxy material to cover themselves for winter.

But there are other white, fluffy things that you might notice on tree bark or branches as well.

Beech scale, the insect associated with beech bark disease, is covered in white wool and remains on the tree throughout the winter. In areas with high beech scale populations, the beech trees can be so white with insects that the bark looks white, like a birch.

Continue reading “What Are Those White Fluffies On Trees?” →

Urban Forestry Internship Application Period Now Open

Posted on by janness

The application period is now open for hundreds of internships with the state of Wisconsin, including two positions with the DNR’s Urban Forestry program!

The urban forest interns will focus on data collection and analysis projects to expand our knowledge of the sustainable management of community forests. Daily work will mostly consist of different tree inventory projects, with opportunities to learn about the wider forestry and urban forestry fields in Wisconsin. Continue reading “Urban Forestry Internship Application Period Now Open” →

Register Now For The WAA/DNR Annual Conference, Feb. 16 – 18. 2025

Posted on by janness

What: 60+ Years of Enhancing the Urban Forests in Wisconsin
When: Feb. 16-18, 2025
Where: Hyatt & KI Convention Center – Green Bay, WI

Green Bay can’t wait for arborists to return for the WAA and Wisconsin DNR Annual Winter Conference! The program committee outdid themselves again with this year’s lineup. Continue reading “Register Now For The WAA/DNR Annual Conference, Feb. 16 – 18. 2025” →