Insect

Treat Your Valuable Ash Trees Against Emerald Ash Borer

Posted on by eleanorvoigt

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

Property owners with healthy, valuable ash trees should consider treating them with insecticide this spring to protect against emerald ash borer (EAB). The pest is currently the most damaging threat to trees in Wisconsin, killing more than 99% of the ash trees it infests.

Woodpecker damage during the winter is often the first sign that an ash tree is infested. Now is an excellent time to consider insecticide protection because the treatments are typically done between mid-April and mid-May once leaves begin to return.

Treatments on already-infested ash trees are more likely to be successful if the trees have low or moderate levels of woodpecker damage.

An ash tree branch with bark missing after woodpeckers attacked it while looking for larvae to eat.

This ash tree branch in West Allis has been attacked by woodpeckers looking for larvae to eat.

Continue reading “Treat Your Valuable Ash Trees Against Emerald Ash Borer” →

Look For Gypsy Moth Egg Masses And Prepare For Hatch; DATCP Slow-The-Spread Treatments Announced

Posted on by eleanorvoigt

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

Typically, gypsy moth egg masses hatch in April as temperatures warm. Now is a great time to do an egg mass inspection to look for unknown infestations and treat or remove any masses within reach. Each mass can result in 500 to 1,000 leaf-eating caterpillars.

Egg masses are tan-colored lumps and vary from about the size of a nickel to a quarter. They can be found on many outdoor surfaces such as tree trunks, the undersides of branches, buildings, rocks, fences, retaining walls, firewood piles and picnic tables.

Gypsy moth egg masses on the underside of a maple branch

Gypsy moth egg masses on the underside of a maple branch. 

Continue reading “Look For Gypsy Moth Egg Masses And Prepare For Hatch; DATCP Slow-The-Spread Treatments Announced” →

Look For Gypsy Moth Egg Masses And Prepare For Hatch; Slow-The-Spread Treatments Announced

Posted on by patricialindquist

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

Gypsy moth egg masses on the underside of a maple branch.

Gypsy moth egg masses are expected to start hatching in April as temperatures warm. Now is a great time to do an egg mass inspection to look for unknown infestations and treat or remove any masses within reach. Each mass that never hatches can result in 500 to 1,000 fewer leaf-eating caterpillars.

Egg masses are tan-colored lumps about the size of a nickel or quarter. They can be found on many outdoor surfaces, including tree trunks, undersides of branches, buildings, rocks, fences, retaining walls, firewood piles and other outdoor objects.

Continue reading “Look For Gypsy Moth Egg Masses And Prepare For Hatch; Slow-The-Spread Treatments Announced” →

Snow Fleas Come To The Surface

Posted on by eleanorvoigt

By Todd Lanigan, Forest Health Specialist, Eau Claire. Todd.Lanigan@wisconsin.gov or 715-210-0150

Snow fleas are a species of springtails that are active during the winter and are generally found in groups where their dark-colored bodies stand out against the white snow. While often observed in late winter or early spring, they also come to the surface on warm winter days. Cold weather drives snow fleas back below the surface to wait for better weather. 

Many snow fleas on snow.

Easily mistaken for specks of dirt or debris, snow fleas are tiny soil-dwelling animals that gather on the surface of the snow on warm winter and spring days.

Continue reading “Snow Fleas Come To The Surface” →

Join Virtual Q&A Sessions With DNR Experts

Posted on by patricialindquist

The Wisconsin Department of Natural Resources (DNR) Urban Forestry program will have a virtual booth at the 2021 WAA/DNR Urban Forestry Annual Conference, Feb. 21-23, 2021. Our virtual booth will feature a new video on our grant program and live group Q&A sessions with our grant and forest health specialists.

A virtual booth could be described as a hybrid between a Zoom call and a website, with some additional features. If you’re attending the annual conference, you’ll have the opportunity to stop by our virtual booth, just as you would at an in-person meeting. Staff will be available to answer questions at set times, and there will be resources available to view and download.

A new video on our DNR Urban Forestry Grant program will be available to view in the booth throughout the conference. Created by DNR Finance Specialist Nicolle Spafford and DNR Grant Manager Chase O’Brien, the video will show you the program’s basics and inspire you to start projects of your own while seeing some successful programs across the state.

Join One Of These Live Q&A Sessions At Our Virtual Booth

Continue reading “Join Virtual Q&A Sessions With DNR Experts” →

Revised Factsheets, Guidelines Now Available

Posted on by eleanorvoigt

By Elly Voigt, DNR Forest Health Lab Technician and Communications Specialist, Eleanor.Voigt@wisconsin.gov

The Wisconsin Department of Natural Resources (DNR) has just released several updated publications, including the annual update of the Heterobasidion root disease and oak wilt factsheets and guidelines. Updated versions can be found on the DNR’s forest health webpage by clicking the links below:

     – Heterobasidion root disease factsheet
     – Heterobasidion root disease guidelines
     – Oak wilt factsheet
     – Oak harvesting guidelines

Minor revisions were also made to the environmental cause of tree damage and conifer bark beetle factsheets. Visit the DNR webpage here for other forest health publications.

For more information on forest health, visit the DNR webpage, or talk to your regional Forest Health Specialist.

Wisconsin DNR 2020 Forest Health Annual Report

Posted on by eleanorvoigt

By Elly Voigt, DNR Forest Lab Technician and Communications Specialist, Eleanor.Voigt@wisconsin.gov

The cover page of the 2020 Annual ReportThe Wisconsin Department of Natural Resources’ Forest Health team recently completed the 2020 Forest Health Annual Report. The report summarizes impacts from pests, diseases and weather on the health of Wisconsin’s forests. Highlights from 2020 include:

• An update on emerald ash borer in Wisconsin, including newly confirmed counties
• New township detections of oak wilt
• Flooding and tornado damage
• Summary of state nursery studies

For access to the report, visit the link here.

Municipal Detections Of Emerald Ash Borer Continued In 2020

Posted on by patricialindquist

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

Emerald ash borer (EAB) reports continued to grow across Wisconsin in 2020. The total number of communities with EAB was 808 as of December, an increase of over 50% since the start of 2020. In addition, the insect was confirmed for the first time in six additional counties (Dunn, Florence, Oconto, Pepin, Price and Shawano) during 2020. EAB has now been found in 58 of Wisconsin’s 72 counties and confirmed on Oneida Nation land. Additional unreported infestations are widely believed to be present.

Municipal (green) and Tribal (blue) EAB detections in Wisconsin as of Dec. 10, 2020. Map created by the Wisconsin Dept. of Agriculture, Trade and Consumer Protection.

Continue reading “Municipal Detections Of Emerald Ash Borer Continued In 2020” →

How to look for white pine bast scale and Caliciopsis canker

Posted on by eleanorvoigt

By Elly Voigt, DNR Forest Health Communications Specialist and Linda Williams, DNR Forest Health Specialist, Linda.Williams@wisconsin.gov, 920-360-0665

The association between a tiny insect and an inconspicuous fungus is causing branch and sapling mortality. White pine bast scale (WPBS; Matsucoccus macrocicatrices) and Caliciopsis canker (caused by Caliciopsis spp.) are agents in an insect/disease complex impacting white pines (Figure 1).

A white pine tree showing branch dieback in the mid and lower crown.

Figure 1. Branch mortality caused by WPBS and Caliciopsis canker.

Continue reading “How to look for white pine bast scale and Caliciopsis canker” →

Deer hunters should avoid ash trees when placing deer stands this hunting season

Posted on by margueriterapp

By Bill McNee, forest health specialist, Oshkosh, bill.mcnee@wisconsin.gov, 920-360-0942

This November, hunters should avoid placing tree stands in or near ash trees, especially in the southern half of Wisconsin, Door County and the Mississippi River counties. Most ash trees in these areas are dead or dying from infestation by emerald ash borer (EAB) and may unexpectedly snap or drop large branches. Place deer stands in non-ash trees to keep yourself safe from infested ash this hunting season.

Infographic showing four ways to identify ash trees.

A photo guide to identifying ash trees.

Continue reading “Deer hunters should avoid ash trees when placing deer stands this hunting season” →