By Bill McNee, DNR Forest Health Specialist, Oshkosh. Bill.Mcnee@wisconsin.gov or 920-360-0942
The University of Wisconsin-Madison Extension has recently updated two insecticide guides for those interested in treating high-value ash trees against emerald ash borer (EAB). One guide lists options for homeowners and the other lists options for tree-care professionals. Download the guides here.
First page of the homeowner guide to EAB insecticide treatments.
Continue reading “Updated Emerald Ash Borer Treatment Guides Now Available”
By Elly Voigt, DNR Forest Health Lab Assistant, Fitchburg
Beech leaf disease (BLD) is a destructive disease affecting beech trees in the U.S. The disease has not yet been observed in Wisconsin, but it could become an issue in the future in the eastern third of the state, which is the edge of the American beech’s native range.
Figure 1. Symptomatic banding on beech foliage, as well as asymptomatic leaves. Photo: Ohio State University Extension
Continue reading “Keep An Eye Out For Beech Leaf Disease”
By Andrea Diss-Torrance, DNR Invasive Forest Insects Program Coordinator, Andrea.DissTorrance@wisconsin.gov, 608-516-2223
Most people know that using locally-sourced firewood helps prevent the spread of invasive pests and diseases. What may be less well known are the processes for finding local sources of firewood or learning where and how you can collect it yourself.
In Wisconsin, oak wilt, emerald ash borer, gypsy moth and several other invasive pests and diseases are moved in or on firewood. During the camping season, these pests can emerge from transported wood to attack trees at the camper’s destination. Photo credit: Wisconsin DNR, MJ Raupp Bugwood, WDNR
Continue reading “It’s Camping Season! Where Can I Get Firewood?”
By Todd Lanigan, DNR Forest Health Specialist, Eau Claire. email@example.com or 715-210-0150
Eastern tent caterpillars (ETC) are hatching and beginning to feed on host trees, including cherry, apple and crabapple. Landowners and homeowners may notice the white silken tents forming in branch forks which are spun by ETC.
Eastern tent caterpillars on a black cherry tree. Photo credit: Wisconsin DNR
Continue reading “White Silk Tents In Trees”
By Danielle Smith, Midwest Center of Excellence for Vector-Borne Disease, UW-Madison
Researchers at the University of Wisconsin-Madison, Columbia University and Michigan State University have developed the TickApp, a mobile smartphone application that allows users to learn how they can protect themselves, their families and their pets from ticks—and join a team of citizen scientists helping researchers better understand ticks and tick-borne disease risk.
Adult blacklegged tick
Continue reading “The Tick App: ‘Your On-the-Go Tick Expert’”
Linda Williams, DNR Forest Health Specialist, Woodruff. Linda.Williams@wisconsin.gov or 920-360-0665.
Emerald ash borer (EAB) has been identified in Langlade County. Although this is the first find of EAB in Langlade County, it was found in three separate areas of the county in the towns of Ainsworth, Parrish and Wolf River. Two of these locations were within the area hit by the derecho storms in July 2019.
This was the first new county EAB detection for 2021 and is the 59th county in Wisconsin to identify the insect. There are no regulatory changes due to these detections since EAB was federally deregulated as of January 14, 2021, and Wisconsin instituted a state-wide quarantine in 2018.
Check out the interactive Wisconsin map showing which Townships and Municipalities are known to have EAB.
Bark removed using hatchet to show EAB larval galleries underneath.
Linda Williams, Forest Health Specialist, Woodruff. Linda.Williams@wisconsin.gov or 920-360-0665
If you notice swollen needles or bare branches on balsam fir trees this spring, the culprit might be balsam gall midge. Adult balsam gall midges are tiny flies that lay their eggs in the developing new shoots shortly after budbreak in the spring.
Balsam fir needles with swellings caused by balsam gall midge will turn brown and drop from the tree prematurely.
Trees with late-breaking buds are less susceptible to gall midge attacks, as the buds are still tight when adult midges are laying eggs. The young larvae feed at the base of developing needles, causing needle tissue to grow around them (forming the needle gall).
The galls are green during the spring and summer but turn yellow in early fall, and infested needles drop prematurely. In the fall, the mature larvae drop to the ground, where they overwinter in the litter. By early the following spring, most of the damaged needles have fallen off, leaving bare spots along the branches where no needles are present.
Control options using insecticide applications are geared towards Christmas trees and are generally not necessary for forest trees.
Bill McNee, Forest Health Specialist, Oshkosh, Bill.Mcnee@wisconsin.gov or 920-360-0942
Ash tree branch in West Allis has been attacked by woodpeckers looking for larvae to eat.
Municipal foresters and property owners with healthy, valuable ash trees should consider treating the trees 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 percent of the ash trees it infests.
Woodpecker damage during the winter is often the first sign that an ash tree is infested, so it is essential to examine your ash trees. Now is an excellent time to consider insecticide protection because the treatments are usually 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.
Continue reading “Treat Your Valuable Ash Trees Against Emerald Ash Borer”
By Don Kissinger, DNR Urban Forester, 715-348-5746 or Don.Kissinger@wisconsin.gov; Paul Cigan, DNR Forest Health Specialist, 715-416-4920 or Paul.Cigan@wisconsin.gov
The Wisconsin Department of Natural Resources (DNR) urban and forest health specialists recommend not pruning or cutting oaks from April through July to protect oak trees from the often fatal oak wilt disease.
The spring season often draws property owners outdoors to soak up rays of long-awaited sunlight, breathe in some fresh air and begin seasonal yard maintenance and cleanup projects. While spring is a time to dust off yard tools like rakes, shovels and weed clippers, when it comes to the health of oak trees, keeping those chainsaws and trimming tools a safe distance away will go a long way to ensure that your trees stay healthy for many more spring seasons to come.
Sap-feeding beetle on a diseased oak tree in Sawyer County.
Continue reading “Protect Oak Trees From Oak Wilt By Pruning After July, Not Before”
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.
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”