Take Action! Look For Gypsy Moth Egg Masses

Posted on by patricialindquist

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

In 2021, gypsy moth populations increased for a second consecutive summer due to favorable weather conditions. Populations typically increase with an average or mild winter, below average spring precipitation and above average May through June temperatures.

Regional variation in weather can result in significant differences in populations. If weather conditions are favorable again in 2022, the most noticeable increase in caterpillar numbers would likely occur in southern counties, where conditions were driest during this past spring and summer.

Populations experience the fastest growth rate and are first noticed on:

  • Dry sites with sandy soil and abundant oak
  • Mowed lawns with preferred tree species (oak, crabapple, birch, etc.)
  • Large oaks (bur, in particular) with rough bark, especially on or adjacent to mowed lawns
Five small gypsy moth egg tan masses on a single tree branch in Walworth County.

Gypsy moth egg masses found in Walworth County in fall 2021.
Photo Credit: Gypsy moth egg masses KMSU

 

 

 

 

 

 

 

 

 

 

 

 

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Managing Damage By White Pine Weevil

Posted on by patricialindquist

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

Tree damage from white pine weevil is noticeable across Wisconsin this time of year. White pine weevils attack several different Wisconsin species, including eastern white pine, jack pine and spruce.

Adult weevils lay their eggs on terminal leaders in the spring. After the eggs hatch, larvae bore into the terminal and begin feeding downwards just under the bark which can result in the killing of a 1 to 2-feet section of the terminal leader as they feed. Terminal leaders will often have a wilted or “shepherds crook” appearance, and they will turn rusty red to brown late in the fall season. These dead terminal leaders will often break off during the winter.

A white pine tree with a cluster of dead twigs caused by a white pine weevil attack.

Dead terminal leader caused by a white pine weevil attack on a young white pine.
Photo Credit: Wisconsin DNR

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Mystery Walnut Defoliator Identified

Posted on by patricialindquist

Article by: Mike Hillstrom, Forest Health Specialist

In 2020, forest health staff in Wisconsin, Minnesota and Iowa received calls about black walnut stands being defoliated and webbed. In 2021, the defoliation expanded to multiple additional black walnut stands in southwest Wisconsin, while northeast Iowa and Minnesota continued to see damage. Recently, molecular work completed by the Wisconsin Department of Agriculture, Trade and Consumer Protection has identified the larvae causing the damage as a native Tortricid moth, Gretchena amatana.

G. amatana caterpillars on tree.

G. amatana caterpillars on tree.

Fine webbing covers walnut tree trunk.

Fine webbing covers walnut tree trunk.

 

 

 

 

 

 

 

 

 

 

 

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Young Oaks Defoliated By Oak Slug Sawfly

Posted on by patricialindquist

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

The oak slug sawfly (Caliroa quercuscoccineae), sometimes called the scarlet oak sawfly, has the appearance of a small, slimy slug. Its slime helps it stick to leaves it feeds on. The oak slug sawfly’s tiny larvae feed in groups on the undersides of oak leaves, scraping out the green material from between the veins of the leaves. The upper leaf surface is usually left intact, creating a “stained glass window” look. Oak slug sawfly has the ability to completely defoliate leaves before dropping to the ground to pupate.

Two oak leaves eaten by oak slug sawfly larvae left with brown discoloration on the leaf and translucent patches.

Oak slug sawfly larvae cause defoliation on oak leaf after feeding.
Photo Credit: Wisconsin DNR

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Oriental Bittersweet: A Bitter Beauty!

Posted on by patricialindquist

Article By: Jaqi Christopher, Invasive plant specialist & Mary Bartkowiak, Invasive plant coordinator

Just as the leaves begin to shift from summer green to the fall shades of gold, orange, red and bronze, the fruits of Oriental bittersweet explode on the scene with their very own show-stopping colors of bright gold and red.

The sight of these vines full of colorful berries may tempt the casual observer to take these berry-filled branches home to use as fall decorations or to plant in their own garden. This, however, would be a mistake, as this striking plant is a serious threat to native ecosystems. Oriental bittersweet is a restricted species under Wisconsin’s Invasive Species Rule NR40. This makes it illegal to transport, transfer or introduce Oriental bittersweet statewide.

Oriental bittersweet is an aggressive-growing woody vine that invades forests, woodlands, fields and hedgerows. The vines twine up trees, smother the crown and girdle trunks with their thick woody stems. In fact, the sheer weight of the vine can cause tree crowns to break and collapse and whole trees to uproot. Additionally, large mats of bittersweet can shade out native plants.

Oriental bittersweet woody vine twines up tree, girdling tree trunk

Oriental bittersweet vine girdles tree trunks. Photo Credit: Minnesota Department of Agriculture

Oriental bittersweet woody vine twines up tree, girdling tree trunk

Oriental bittersweet vine girdles tree trunks. Photo Credit: University of Illinois’ Chris Evans

 

 

 

 

 

 

 

 

 

 

 

 

 

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DNR To Accept Seedling Orders For The Spring Starting Oct. 4, 2021

Posted on by Kirsten Held

The Wisconsin Department of Natural Resources (DNR) Division of Forestry’s reforestation program will accept seedling orders from Wisconsin forest landowners for trees and shrubs to be planted in spring 2022 starting Oct. 4, 2021. The high-quality seedlings are native species appropriate for planting throughout Wisconsin.

Seedlings grown by the state nurseries are used for reforestation and conservation plantings on private, public and tribal lands. These seedlings can provide future forest products and revenues, wildlife habitat, soil erosion control, living snow fences, aesthetics and shade to landowners and managers in every state county. Continue reading “DNR To Accept Seedling Orders For The Spring Starting Oct. 4, 2021” →

Nominate Your Community Tree Champion For An Urban Forestry Council Award!

Posted on by patricialindquist

The Wisconsin Urban Forestry Council (UFC), comprised of municipal employees, elected officials, nursery operators and arborists, advises the Department of Natural Resources (DNR) Division of Forestry on the best ways to manage urban and community forest resources.

Every year, the Council bestows several awards to recognize and thank individuals, organizations, communities and tribes across Wisconsin for their work and commitment to trees, plantings, habitat and the economic benefits they provide. The awards are announced at the annual Wisconsin Urban Forestry Conference in February and presented to winners in their communities.

We are currently seeking nominations for next year’s awards. The deadline for 2022 nominees is Oct. 31, 2021. However, you can nominate your community tree champions at any time.

There are five categories of awards, including our new Next Gen award:

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A Reminder that the Application Deadline is Coming Up for 2022 Urban Forestry Grants!

Posted on by patricialindquist

Cities, villages, towns, counties, tribes and 501(c)(3) nonprofit organizations in or conducting their project in Wisconsin are encouraged to apply for a regular or startup 2022 Department of Natural Resources Urban Forestry Grant! The grants range from $1,000 to $25,000, and grant recipients must match each grant dollar for dollar. A startup grant of up to $5,000 is available for communities that want to start or restart a community forestry program. Grants are awarded to projects that align with state and national goals for increasing the urban forest canopy and the benefits it provides.

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WAA Fall Seminar

Posted on by patricialindquist

The Wisconsin Arborist Association (WAA) will host this year’s Fall Seminar in-person and virtually.

The in-person seminar will be held on Sept. 15 from 7:30 a.m. to 4 p.m. at Army Lake Camp & Retreat Center in East Troy, Wisconsin. Up to 6 CEUs are available. The registration deadline is Friday, Sept. 10. The fee is $100 for WAA members or $110 for nonmembers plus a $25 late registration fee. Full-time students may attend for free. Register online here.

For those who prefer to participate online, the content of the in-person seminar will be repeated on a virtual platform that can be viewed Oct. 1-15. The online seminar will include five hours of virtual learning and engagement with 5 CEUs available through an online quiz. The registration deadline is Sept. 30, and the fee is $90 for WAA members or $100 for nonmembers. Full-time students may attend for free. Register online here.

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ArbNet Arboretum Accreditation Program

Posted on by patricialindquist

Created and administered by the Morton Arboretum in Chicago, the ArbNet Arboretum Accreditation Program is the only international accreditation program specific to arboreta. It fosters professionalism and collaboration and recognizes arboreta at various levels of development.

The program is free of charge, and accreditation is valid for five years with a simple renewal every five years.

Examples of institutions that may be accredited include arboreta and botanic gardens, historic properties, college campuses, cemeteries, zoos, city tree collections, corporate campuses, school properties, golf courses, nature reserves and municipal parks.

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