Technical assistance

Make Plans To Control Spongy Moth Before The Eggs Hatch

Posted on by patricialindquist

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

Spongy moth (formerly known as gypsy moth) egg masses typically begin to hatch in April as temperatures warm. Each mass that hatches may produce up to 1,000 leaf-eating caterpillars.

Now is a great time to inspect your trees for egg masses and treat or remove any masses within reach. Wisconsin weather has been favorable for this pest over the last three years and populations have grown.

Photo of three spongy moth egg masses on the underside of a pine branch in Walworth County.

Three spongy moth egg masses on the underside of a pine branch in Walworth County. Photo: Bill McNee, Wisconsin DNR.

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Make Your 2023 Spongy Moth Treatment Plans Early

Posted on by brenna.denamur

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

As long as weather conditions are favorable for the spongy moth* (formerly known as gypsy moth) population, the current outbreak is predicted to continue and spread to other parts of Wisconsin in 2023. Property owners are encouraged to examine susceptible host trees (including oak, birch, crabapple, aspen and willow) and plan ahead.

Spongy moth egg masses on a tree next to a penny for size comparison.

Spongy moth egg masses are tan-colored lumps that are larger than a penny, about the size of a nickel or quarter. Photo: Wisconsin DNR

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Harvest Timing Affected By Spongy Moth

Posted on by brenna.denamur

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

Numerous spongy moth egg masses on a bur oak in southern Waukesha County, November 2022.

Numerous spongy moth egg masses on a bur oak in southern Waukesha County, November 2022. Photo: Bill McNee, Wisconsin DNR.

Forest managers planning silvicultural treatments in spongy moth susceptible stands (containing a large proportion of host species including oak, birch, aspen and basswood) are encouraged to annually conduct egg mass surveys in the few years prior to the scheduled treatment to predict if heavy defoliation is likely. The results may indicate that management activities should be altered or delayed until an outbreak has ended. At present, stands that were heavily defoliated in 2022 or are predicted to be heavily defoliated in 2023 are most likely to need a management delay or alteration.

It is recommended that a time interval be left between a stress agent (such as heavy defoliation or significant drought) and stand thinning so that the trees can recover from pre-existing stress before being subjected to additional stress. One growing season is a common interval for healthy stands that are not being subjected to drought or other stresses. A longer interval is suggested if the tree stress has been more severe or if the stand was not healthy and vigorously growing at the time of defoliation. The same interval is probably appropriate regardless of which stress agent is the pre-existing one. A protective aerial spray may prevent tree stress from defoliation but is usually not economically viable due to the high cost of an aerial treatment.

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Look For Spongy Moth Egg Masses – Larger Outbreak Possible in 2023

Posted on by kirsten.biefeld

By: Bill McNee, DNR Forest Health Specialist, Oshkosh

bill.mcnee@wisconsin.gov or 920-360-0942

Three tan-colored spongy moth egg masses on a single tree branch in Walworth County.

Three spongy moth egg masses on a branch in Walworth County. Photo Credit: Bill McNee, Wisconsin DNR

Now that spongy moth* (formerly known as gypsy moth) egg laying is complete for 2022, it’s a good time to look for and dispose of egg masses produced by adult moths over the past two months.

Spongy moth egg masses are tan-colored lumps about the size of a nickel or quarter, and are found on trees, buildings and other outdoor objects. They may also be found in protected places such as firewood piles and birdhouses. Newly produced egg masses will feel firm and appear darker in color than older egg masses, which appear faded, feel spongy and do not contain viable eggs. The current-year egg masses will not hatch until next spring.

In 2022, Wisconsin’s spongy moth population grew for a third consecutive summer due to favorable weather conditions and limited caterpillar mortality from diseases. The outbreak was most dramatic in opposite ends of the state. In southern and southeast Wisconsin, several thousand oak-dominated acres were heavily defoliated and very large numbers of property owner reports were received by DNR staff. In Bayfield County, about 80,000 acres of rural defoliation was reported from aspen-dominated forests. Smaller patches of defoliation were also reported from several other counties. Continue reading “Look For Spongy Moth Egg Masses – Larger Outbreak Possible in 2023” →

Tree Ordinances: Why They’re Important, How To Write Them, And Resources For Help

Posted on by kirsten.biefeld

By: Abigail Krause, DNR Urban Forestry Coordinator

Trees contribute to a community’s character and livability. Improved air quality, stormwater management, energy savings, and increased aesthetics are just a few of the frequently referenced benefits provided by trees. However, as with any community infrastructure, trees also need to be managed and maintained.

Ordinances are one step communities can take to shift from reactive to proactive management and avoid large, unexpected maintenance costs. 

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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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Tree Inventory Accounts Available

Posted on by patricialindquist

By Dan Buckler, DNR Urban Forest Assessment Specialist, Madison, Daniel.Buckler@wisconsin.gov or 608-445-4578

Do you have a tree inventory but have had a hard time keeping it current, or you’re interested in inventorying some trees of your own? The Wisconsin Department of Natural Resources (DNR) is funding several accounts for communities or organizations to edit data within the Wisconsin Community Tree Map, a compilation of tree inventories from around the state. The map shows where trees are located and includes information about each tree, such as diameter, health condition and street address.

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Free Tree Inventory Software Pilot Opportunity

Posted on by patricialindquist

By Dan Buckler, DNR Urban Forest Assessment Specialist based in Madison, daniel.buckler@wisconsin.gov or 608-445-4578

Do you have a tree inventory but have had a hard time keeping it current? The Wisconsin Department of Natural Resources (DNR) maintains the Wisconsin Community Tree Map, a compilation of tree inventories from around the state. The map shows where trees are located in different communities and includes information about each tree, such as diameter, health condition and street address.

The DNR recently acquired a few extra accounts to distribute to communities on a pilot basis. We would like to distribute these accounts to communities that would make use of the tree map functionality and actively use the tool to add or remove trees in the inventory or to edit current data (e.g. change the diameter, mark the tree as pruned). If you already have a tree inventory tool that you use and like, then this option is probably not for you. But if you don’t have a tool, then you might be interested in this free account. It could be accessed with a smart phone, tablet or computer, provided there is an internet connection. The DNR can help provide training on the tool for interested communities.

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Four Communities Kick-Start Urban Forestry Programs With DNR Assistance

Posted on by patricialindquist

By Don Kissinger, DNR Urban Forestry Coordinator based in Wausau, Don.Kissinger@wisconsin.gov or 715-348-5746 

In 2018, I had been covering the Northwest part of the state for three years due to a vacancy and saw first-hand a lack of proactive community forestry management in some areas, but also a lot of potential.

To help kick-start new urban forestry programs in the region, I proposed that the Wisconsin Department of Natural Resources (DNR) use some of our US Forest Service funding to contract an urban forestry consultant to work one-on-one with selected communities. The consultant would meet with community staff, collect tree inventory data and develop individual operations plans.

The selected communities would then agree to apply for our 50-50 matching Startup Grants to implement the developed plan. A similar strategy (minus the startup grant commitment) had worked well in southern Wisconsin in 2012: out of five selected communities (Adams, Elroy, Hillsboro, Mauston and Necedah), four have become Tree City USA communities, three have had staff complete the Community Tree Management Institute (CTMI) and one has hired a full-time forester responsible for their community’s street, park, and cemetery trees.

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What does a DNR Urban Forestry Coordinator do?

Posted on by patricialindquist

By Olivia Witthun, DNR urban forestry coordinator, Plymouth, olivia.witthun@wisconsin.gov, 414-750-8744 

Wisconsin’s urban forests provide a wide range of ecological, economic and social benefits. Urban areas contain nearly 27 million trees with an estimated total replacement value of almost $11 billion. Many don’t realize all the services urban forests provide. They reduce air pollution, mitigate storm water runoff, conserve energy, provide wildlife habitat, increase property values, and attract businesses, tourists and residents. They even improve public health and well-being. The Wisconsin DNR’s Urban Forestry Team seeks to maximize these benefits derived from our state’s community tree canopies. 

Thirteen people are part of the DNR Urban Forestry Team, and six of those are Urban Forestry Coordinators (UFCs).  Each UFC serves a different region, and within that region, we mainly serve city foresters, local government tree managers and other partners.  (UW Extension serves homeowners.)  Your UFC is your go-to contact for all things urban forestry. 

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