Best Management Practices

Controlling Buckthorn With Plants

Posted on by janness

By Olivia Witthun, DNR Urban Forestry Coordinator, Olivia.Witthun@wisconsin.gov or 414-750-8744 and Elton Rogers, DNR Urban Forestry Coordinator, Elton.Rogers@wisconsin.gov or 414-294-8675

buckthorn The Cover It Up project is a suite of related research projects conducted by multiple partners in Minnesota that are evaluating the ecology and management of buckthorn and other invasive plant species. Buckthorn is an invasive understory plant that was introduced to Wisconsin well over 100 years ago. It was used primarily in hedgerows, prized for its lack of pest issues and the fact it greens up early and holds its leaves well into the fall. These once desirable characteristics are also what turned this non-native into one of our state’s worst invasive species, easily outcompeting our natives, taking over Wisconsin’s forests, riparian woods, savannas, prairies, old fields, roadsides and vacant lots. Continue reading “Controlling Buckthorn With Plants” →

Call For Urban Forestry Presentations: Due July 1, 2026

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Wisconsin Arborist Association LogoThe Wisconsin Arborist Association (WAA) is accepting presentations for the 2027 Annual Conference to be held in Green Bay, WI on Feb. 14-16, 2027. This three-day event attracts approximately 950 attendees including professional arborists, community foresters, nursery professionals, utility workers, park/recreation staff, other green industry professionals, educators and students.

If you are interested in speaking at this conference, please complete the online form. Please make sure that the form is filled out completely to be considered. Continue reading “Call For Urban Forestry Presentations: Due July 1, 2026” →

Upcoming Training & Events

Posted on by janness

 * These training opportunities are provided as an information service only and do not constitute endorsement by the Wisconsin Department of Natural Resources (DNR).

See below for information on training topics and events, including flowering trees, climbing events, ecological restoration and gardening, urban forestry risks, soil health, chainsaw training, useful software and online tools, advocacy, career advancement and maintaining optimism.

Continue reading “Upcoming Training & Events” →

Community Spotlight: Cedarburg’s UF Program – 2025 Report

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tree-lined street

Photo Credit: City of Cedarburg

By Olivia Witthun, DNR Urban Forestry Coordinator
Olivia.Witthun@wisconsin.gov or 414-750-8744
and
Kevin Westphal, City of Cedarburg City Forester
kwestphal@cityofcedarburg.wi.gov or 262-375-7662

Annual program reports can be a very useful tool. One example is Cedarburg’s 2025 urban forestry report. It is detailed, yet not overwhelming, and the format provides for easy comprehension at a quick glance. The annual report includes things like: a mission statement, the number and location of vacant plantable sites, removal/planting/pruning numbers, specific cultivars planted, types and reasons for pruning and a comparison to previous years.

The report is shared with Cedarburg’s Parks & Forestry Board, City Council, and other leadership and can also be found on their website. Cedarburg’s city forester attends these local meetings, goes over the main points in the report and answers any questions they may have. Additionally, some of the information is useful when filling out their Tree City USA application. Continue reading “Community Spotlight: Cedarburg’s UF Program – 2025 Report” →

Submit Proposals For Partners In Community Forestry Conference

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Arbor Day Foundation LogoThe Partners in Community Forestry Conference is currently seeking speaking proposals for the upcoming conference Nov. 18-19 in St. Louis.  Any passionate speakers, community leaders and learners are encouraged to send a proposal submission. These speeches are an opportunity to share your expertise and passion about community forestry with others. The topics for this year’s speaker proposals include: Continue reading “Submit Proposals For Partners In Community Forestry Conference” →

Upcoming Training

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Photo Credit: Wisconsin DNR

* These training opportunities are provided as an information service only and do not constitute an endorsement from the Wisconsin Department of Natural Resources (DNR).

See below for training on urban forestry basics, tree risk fundamentals in Spanish, plant diseases and pests, invasive species, student apprenticeships, nut trees and other urban forestry resources. Continue reading “Upcoming Training” →

Oak Wilt Information Updated

Posted on by akabelowsky
University of Wisconsin-Madison Extension online tool to help with oak wilt decisions.

A University of Wisconsin-Madison Extension online tool provides users localized information about the estimated emergence status of the two most important insects that transmit oak wilt in Wisconsin. / Graphic Credit: University of Wisconsin-Madison Extension

By Kyoko Scanlon, DNR Forest Pathologist, Fitchburg
Kyoko.Scanlon@wisconsin.gov

In 2025, oak wilt was detected for the first time in Hughes Township, Bayfield County, a northern Wisconsin location where oak wilt remains uncommon. There were no new county finds in 2025.

Based on the findings in 2025, the maps in the Oak Harvesting Guidelines To Reduce The Risk Of Introduction And Spread Of Oak Wilt (the oak wilt guidelines), oak wilt fact sheet and were updated. The maps in the oak wilt guidelines are good through the end of 2026.

Continue reading “Oak Wilt Information Updated” →

Oak Wilt High Risk Period Quickly Approaches

Posted on by akabelowsky
A closeup of a fungal pressure pad under the bark of an oak tree infected with oak wilt.

A fungal pressure pad formed on the outside of the sapwood underneath the bark of an infected tree. The pad will create cracks in the bark, where beetles can enter and visit the pad and become covered in spores. They will then leave and move on to infect new trees through open wounds. / Photo Credit: Wisconsin DNR

By Alex Hornung, DNR Forest Health Specialist, Plover
Alexandra.Hornung@wisconsin.gov or 715-340-3810

It is again that time of year to pause operating in oak stands or pruning oak trees during the high-risk period for oak wilt, which begins in April. The high-risk period begins April 1 in the South, April 15 in the North, and ends in both zones on July 15.

The high-risk period is determined by when the beetles that carry the fungus that causes oak wilt have emerged for the year and when they are carrying the highest number of fungal spores. When wounds are created by logging operations or other activities that expose sapwood, the beetles carry the fungus to the wounded tree, and the disease process begins.

Continue reading “Oak Wilt High Risk Period Quickly Approaches” →

Upcoming Training

Posted on by janness

group of people listening to a speaker in the woods* These training opportunities are provided as an information service only and do not constitute an endorsement from the Wisconsin Department of Natural Resources (DNR).

See below for information on training topics and events, including shade trees, fruit trees, chainsaw certification, tree diseases and pests, pruning and public perspectives on trees. Continue reading “Upcoming Training” →

Now Is Time To Seek Out Spongy Moth Egg Masses

Posted on by akabelowsky
Large spongy moth egg masses on a tree main stem.

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

By Bill McNee, DNR Forest Health Specialist, Oshkosh
Bill.McNee@wisconsin.gov

It certainly has been chilly in recent weeks, but spring is coming. When the weather warms up, the annual return of spongy moth caterpillars will begin.

The overall spongy moth population is currently low in Wisconsin. However, egg mass numbers may remain high enough to cause nuisance problems and heavy tree defoliation on individual trees or in small areas.

There’s a way for property owners to help keep the population down: Get out now to locate and properly dispose of spongy moth egg masses, which were produced by adult moths last summer. Each spongy moth egg mass contains hundreds of eggs that will hatch into hungry, leaf-eating caterpillars in the spring.

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