Statewide Forest Health

ALB: What to watch for in Wisconsin

By Linda Williams, forest health specialist, Woodruff, Linda.Williams@wisconsin.gov, 920-360-0665

We do NOT have Asian longhorned beetle (ALB) in Wisconsin at this time, but it’s good to be on the lookout for it. Every year folks submit reports of insects that they suspect to be ALB, but to date they have always been confirmed as the native whitespotted sawyer (sometimes called pine sawyer), which attacks stressed conifers rather than the maple and other hardwood species preferred by ALB. If you find a beetle that you suspect to be ALB, please collect the beetle, take some pictures, and send them to your forest health specialist, or to the University of Wisconsin Insect Diagnostic Lab for identification.

Asian longhorned beetle is a large beetle. They are smooth and shiny black with white spots and blotches on their wing covers. Photo by Joe Boggs, Ohio State University, bugwood.org

Asian longhorned beetle is a large beetle. They are smooth and shiny black with white spots and blotches on their wing covers. Photo by Joe Boggs, Ohio State University, bugwood.org.

 

Our native pine sawyer beetle appears dusty or pitted, but is often mistaken for Asian longhorned beetle. Photo by Linda Williams.

Our native pine sawyer beetle appears dusty or pitted, but is often mistaken for Asian longhorned beetle. Photo by Linda Williams.

ALB can be a very destructive pest. It is typically introduced, unintentionally, to new areas via wooden pallets, wood packing materials, or firewood. The Don’t Move Firewood website has some great tips for safe transport of firewood, how to find firewood locally, as well as a list of other invasive insects and diseases to be aware of when buying or using firewood.

USDA APHIS, which conducts eradication efforts wherever ALB is found, recently announced that an area of Ohio was officially ALB-free, and the quarantine was subsequently removed. Earlier this year in March, a separate area of Ohio was also declared ALB-free. That leaves just one area of Ohio with ALB quarantines still in effect. Eradication of ALB can take decades to complete and involves extensive efforts including tree removal and chemical treatments. States with current ALB quarantines include: Massachusetts, New York and Ohio.

For more info on ALB, check out the USDA APHIS ALB webpage, and as always, please let us know if you think you have come across a forest health concern, including ALB.

Invasive stink bug numbers increasing

By Mike Hillstrom, forest health specialist, Fitchburg. Michael.Hillstrom@wisconsin.gov; 608-513-7690

Invasive brown marmorated stink bugs (BMSB) are now well established and reproducing in southern and central Wisconsin. This fall we are getting our first reports of large numbers of BMSB gathering on the sides of houses looking for places to overwinter. This problem will continue to get worse as stink bug populations increase and their range expands. Damage to important crops, ornamental plants and trees will also be a major concern. BMSB is known to feed on a wide variety of plants including apples, tomatoes, corn, soybeans, silver maple and walnut.

Adult brown marmorated stink bugs are ½ to ¾ inch long, brown with alternating white and black patches on the edge of the abdomen and white bands on the antennae and have smooth shoulders that lack spines.

An adult brown marmorated stink bug. Photo by P.J. Liesch, University of Wisconsin Insect Diagnostic Lab.

Researchers are working on ways to manage the pesky bugs. One new method being explored is hanging black netting soaked in insecticide at locations where the bugs congregate, such as doors on the north and east sides of structures.

Samurai wasps are another promising lead. These stink bug-killing wasps found their way into the U.S. on their own over the past few years, but researchers are also working with lab-reared samurai wasps that they hope to release. Samurai wasps parasitize the eggs of BMSB but do not sting humans or other animals.

For more information about identification and management check out:
University of Wisconsin-Extension
WisContext
Midwest Stink Bug app

New forest health specialist for Central Zone

New forest health specialist Alex Feltmeyer in woods.

New forest health specialist Alex Feltmeyer. Photo by Mike Hillstrom.

Alexandra (Alex) Feltmeyer started October 15, 2018 as the Forest Health Specialist for the Central Zone (Adams, Green Lake, Lincoln, Marathon, Marquette, Menominee, Oconto, Portage, Shawano, Taylor, Waupaca, Waushara, and Wood counties). Alex will be stationed at the Plover Ranger Station and will start making connections with the foresters and partners in her zone right away. Her contact information is Alexandra.Feltmeyer@wisconsin.gov and 715-340-3810.

As a reminder, the DNR forest health specialists are available to diagnose and provide management recommendations for forest health concerns such as insect, disease and weather-related damage on forested properties in Wisconsin. The forest health specialists are also available to give presentations and trainings on current insect and disease concerns and management guidelines. For a full list of forest health program staff and the counties they cover, please visit https://dnr.wi.gov/topic/ForestHealth.

Public comment period for HRD treatment guidelines revision closes October 16

A fruiting body of Heterobasidion irregulare at the base of a pine tree.

By Kyoko Scanlon, forest pathologist, Fitchburg. Kyoko.Scanlon@wisconsin.gov; 608-235-7532

Wisconsin DNR is seeking public comments on a proposed revision to preventative treatment guidelines for Heterobasidion root disease (HRD). Stand-level HRD treatment guidelines were originally released in 2013. A DNR technical team and stakeholder advisory committee proposed a revised version using recent research findings, operational experience, and economic considerations.

The draft document and information about the public comment process can be found at  https://dnr.wi.gov/news/input/Guidance.html#open through Tuesday, October 16, 2018. All comments must be submitted by that date.

Leaf-browning on white and burr oaks

By Mike Hillstrom, forest health specialist, Fitchburg. Michael.Hillstrom@wisconsin.gov; 608-513-7690

Dying leaves on white oak. Photo: Mike Hillstrom.

Dying leaves on white oak. Photo: Mike Hillstrom.

During late August and September of this year, Forest Health staff received several comments about problems with white and burr oaks. Leaves on affected trees turned brown, curled and died prematurely. Some trees were almost completely affected, while others only mildly. Symptoms varied widely between trees, even between those located next to each other. After examining several samples, the DNR Forest Health Lab concluded that damage was likely caused by fungal leaf pathogens and the twig canker fungus Botryosphaeria. Because the damage occurred late in the growing season, afflicted trees will not likely suffer major impacts. Although Botryosphaeria can cause twig dieback, oak trees usually recover without long-term problems. Continue reading “Leaf-browning on white and burr oaks”

Return of Asian multicolored ladybugs

By Linda Williams, forest health specialist, Woodruff. Linda.Williams@wisconsin.gov; 920-360-0665

Multicolored Asian ladybeetles, true to their name, come in a range of colors, from orange to red, with a variety of spot sizes and numbers.

Multicolored Asian ladybeetles, true to their name, come in a range of colors, from orange to red, with a variety of spot sizes and numbers. Photo: Linda Williams

Multicolored Asian ladybeetles are not native to Wisconsin. Although there are numerous native ladybugs in the state, only the Asian variety are known to aggregate in buildings in the fall and become nuisances. Continue reading “Return of Asian multicolored ladybugs”

Public comment period for EAB silviculture guidelines revision closes October 9

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

Ash trees dying from an EAB infestation. Photo: Troy Kimoto, Bugwood.org

Ash trees dying from an EAB infestation. Photo: Troy Kimoto, Bugwood.org

The Wisconsin DNR is seeking public comments on a proposed revision to silviculture guidelines for emerald ash borer (EAB). Stand-level EAB silviculture guidelines were originally released in 2007, with periodic reviews and updates. A DNR technical team and stakeholder advisory committee prepared the current version using multiple sources of information, including recent research findings, identification and locations of new EAB infestations, economic considerations, and experience gained from implementing previous versions of the guidelines.

The draft document and information about the public comment process can be found at  https://dnr.wi.gov/news/input/Guidance.html#open through Tuesday, October 9, 2018. All comments must be submitted by that date.

Requiem for an Ash

The front moves and defenses are built, but there’s no doubt which way the war is going, and little doubt what is emerging the victor: a little green bug.

Agrilus planipennis, the emerald ash borer, has harangued and harassed North American forests since the late 1990s, and its journey across Wisconsin continues, county by county, city by city, tree by tree. But this is not its story. Continue reading “Requiem for an Ash”

Look for gypsy moth egg masses

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

Gypsy moth egg masses. Photo: Bill McNee

Fall is an excellent time to look for and dispose of gypsy moth egg masses produced by adult moths this summer. Gypsy moth egg masses are felt-like, tan-colored patches about the size of a nickel or quarter that gypsy moth females deposit in protected places. Surveying for egg masses helps property owners predict how high populations of the insect will be during the subsequent spring and summer. Since egg masses usually don’t hatch until April, information gained from fall/winter surveys can be used to mitigate gypsy moth damage before the following season.  Continue reading “Look for gypsy moth egg masses”

Tree decline and mortality observed at many wet sites this summer

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

An aerial view of tree mortality in very wet areas. Photo: Bill McNee

An aerial view of tree mortality in very wet areas. Photo: Bill McNee

Site visits and aerial surveys conducted on trees in eastern Wisconsin by the Wisconsin DNR forest health team in July and August found multi-species decline and mortality common at many very wet sites. Continue reading “Tree decline and mortality observed at many wet sites this summer”