Recently, there were two reports of a white, frothy substance on the bases of otherwise healthy- looking, mature pine. There are two different possible explanations for this interesting and unusual phenomenon. Continue reading “Frothy foam on pine stems could be stemflow mixing or alcoholic flux”
Statewide Forest Health
Invasive insects and disease awareness month
Vin Vasive is the spokesman for invasive insects at USDA APHIS. He is made up of invasive species. This USDA APHIS poster was designed by Deb Levy Creative.
April is invasive plant pest and disease awareness month, and May 21-27 is EAB awareness week.
It’s spring, and a good time to remember that invasive species can be easily moved long distances by unsuspecting citizens; maybe even you! All it takes to potentially start a new infestation is to move things we often like to take with us, but don’t know are a problem:
- firewood,
- infected or infested plant material,
- an infected or infested piece of fruit, or
- even a decorative piece of northwoods style furniture that hasn’t been properly treated to kill pests hiding inside.
Take a moment to think about whether you are unknowingly moving items that could harbor pests. The Hungry Pests website lists things you can do to prevent the spread of invasive species, whether you’re a birdwatcher, gardener, hunter, logger, or anyone. Check it out! While you’re there check out some short videos of their “spokesman” Vin Vasive, who has gotten much creepier over the years.
Help spread the word
Coming up, May 21-27 is emerald ash borer awareness week, which is right before the Memorial Day holiday, when lots of travelling, camping, and opening up of summer cabins occurs. The Don’t Move Firewood website has a nice video of how to identify an EAB infested tree. More detailed videos are also available at dnr.wi.gov, keyword “forest health.” If you would like some examples of outreach tools or publications you can use to promote EAB awareness, check out the Don’t Move Firewood website; there you’ll find games for kids, an EAB craft project, videos, press releases, and news articles from past years.
Written by: Linda Williams, forest health specialist, Green Bay, (Linda.Williams@wisconsin.gov), 920-662-5172. Categories: FH, UF. Tags: Statewide FH, Insect, Pest
DNR will conduct aerial spraying for gypsy moth in Madison, Monona and at Devils Lake State Park
Spray aircraft used in gypsy moth control.
Residents in the Madison and Baraboo areas can expect a morning or two of loud, low-flying planes this May. The DNR Gypsy Moth Suppression Program will be spraying to control high populations of gypsy moth, an invasive and destructive pest whose caterpillars feed on the leaves of many tree and shrub species. Aerial spraying will occur in the following locations:
- Cities of Madison and Monona: Three sites in and around Orton Park, Quaker Park, and Acewood/Elvehjem Parks
- Devils Lake State Park: Day-use area at the south end of the lake, and the day-use area and several campgrounds at the north end of the lake.
Maps of the treatment areas can also be seen at the Wisconsin Cooperative Gypsy Moth Program website. Spraying is currently predicted to occur in mid-May, but actual dates will depend on weather conditions and caterpillar development.
Amur cork tree is an emerging threat to Wisconsin forests.
Amur cork tree (Phellodendron amurense) is a relatively new invasive plant found in at least four Wisconsin counties. It is classified as Prohibited under Wisconsin’s invasive species law, NR 40. The female cork tree cannot be possessed, transferred, transported or introduced in Wisconsin. We ask that you report this tree to DNR because it is invasive here and in other states and DNR is mounting control efforts before it becomes widespread. DNR works with property owners to achieve this by providing advice, tools and resource opportunities. Continue reading “Amur cork tree is an emerging threat to Wisconsin forests.”
Herbicide damage to trees
Herbicide damage can resemble other tree problems such as branch dieback, foliage discoloration, and premature leaf or needle drop. Look for certain clues to help narrow down whether it is a weather related issue, insect or disease issue, or a potential herbicide issue.
Forest tent caterpillar egg mass surveys indicate low populations again
Newly hatched forest tent caterpillars with the egg mass they emerged from. Egg masses are laid in mid-summer and remain on the tree through the winter.
Low numbers of forest tent caterpillar egg masses were found recently during surveys in Vilas and Oneida Counties. Forest tent caterpillar is a native insect that has periodic outbreaks. Our last outbreak was from 1999-2002, and they typically have outbreaks every 10-15 years. Last year I noticed a few more caterpillars than the previous year, but there was no noticeable defoliation. So far egg mass surveys indicate another year of low populations, although there may be areas with locally higher populations. Forest tent caterpillar eggs will start hatching soon, timed to closely match the emergence of aspen leaves.
Eastern tent caterpillars hatch from eggs and immediately start to create a web nest. Young caterpillars are shown on a small nest.
Eastern tent caterpillars do not follow a typical outbreak pattern and tend to be present at some low level every year. They create web nests early in the spring, preferring black cherry trees, crabapple trees, or other stone fruits. When webs are small the caterpillars can be easily crushed or sprayed. As webs get bigger you may have to use a rake to pull them out of the tree. It is not necessary to prune the branch out of the tree. Doing so will actually cause more damage to the tree than the defoliation caused by the caterpillars, because trees can more easily send out additional leaves than grow a branch to replace one you prune out. Please do not burn nests out of the trees as this could start a wildfire.
Written by: Linda Williams, forest health specialist, Green Bay, (Linda.Williams@wisconsin.gov), 920-662-5172.
Emerald ash borer new locations in Wisconsin
EAB quarantine and detections map. Counties shaded in tan are quarantined for EAB, green areas are townships and municipalities where EAB has actually been identified.
Emerald ash borer (Agrilus planipennis) continues to be found in new areas. Wisconsin continues to track EAB at the municipality or township level; quarantined counties are shown in tan and known infested areas are shown in green on the map.
If you know you have EAB, please contact us with that information so we can verify the infestation and update the maps. If your area:
- is not shaded in green on the map please contact DNR or
- is not shaded at all on the map please contact DATCP.
You can reach both agencies from the menu options when you call 1-800-462-2803.
New county quarantines
- none
New finds in counties already quarantined
- Adams/Columbia/Juneau/Sauk counties — city of Wisconsin Dells
- Brown County — village of Allouez
- Crawford County – town of Bridgeport
- Columbia County – town of Lowville
- Columbia/Dodge counties – village of Randolph
- Dane County – village of DeForest
- Green County – town of Monroe
- Jackson County — towns of Melrose and North Bend
- Jefferson County – towns of Aztalan, Farmington, Hebron, and Sumner
- La Crosse County – town of Shelby
- Monroe County – city of Sparta
- Rock County – towns of Clinton, Harmony, Johnstown, and Lima
- Sheboygan County – village of Kohler
- Trempealeau County — towns of Ettrick, Gale and Preston
Written by: Linda Williams, forest health specialist, Green Bay, (Linda.Williams@wisconsin.gov), 920-662-5172.
Emerald ash borer trapping in 2017
The Wisconsin DNR forest health team is planning to trap for emerald ash borer (EAB) at 20 locations in 2017.
EAB trap locations in northwest Wisconsin in 2017.
EAB trap locations in northeast Wisconsin in 2017.
Traps will mostly be placed on state properties. A couple traps will be placed on county land where state properties are not in the local area. Traps are deployed close to 400 growing degree days so they are ready when EAB adults start emerging at approximately 450 degree days. In 2016, southern Wisconsin hit 450 degrees days (modified base 50°F) in late May.
Written by: Mike Hillstrom, forest health specialist, Wisconsin Dells (Michael.Hillstrom@Wisconsin.gov), 715-459-1371.
Lesser celandine is an emerging threat to Wisconsin forests – be on the lookout.
Spherical bulbils of lesser celandine form during the spring growing season. Later they drop off and sprout to form new plants.
Lesser celandine (Ranunculus ficaria), also known as fig buttercup, is a ground layer plant and an aggressive invader of forests in North America. So far, it is relatively unknown in Wisconsin but has been found in the southeastern part of the state, especially in moist (mesic and wet-mesic) forests and along river banks.
Lesser celandine is a spring ephemeral that emerges in early spring, develops flowers, dies back by early summer, and remains dormant in underground tubers. During the short growing period the plant produces bulbils which sprout and give rise to new plants. After the round bulbils drop off they are spread by gravity, water, small animals, and like the tubers, transported when soil is moved. Continue reading “Lesser celandine is an emerging threat to Wisconsin forests – be on the lookout.”
Welcome to the new Forest Health News
The DNR Forest Health Program has transitioned to a new online newsletter format. You will no longer receive Pest Updates and Regional Forest Health Newsletters directly from DNR Forest Health Specialists. Instead, if you are subscribed to Forest Health News you will receive an email, typically once per month, when new information is posted by the Forest Health Program on this new Wisconsin DNR Forestry News site. You can also access the articles directly anytime.
If you haven’t already, consider subscribing and please take a moment now to include widnr@service.govdelivery.com in your email address book, so the emails avoid your spam box.
Monthly emails will have Forest Health articles organized by:
- Information that is relevant statewide and
- Information specific to certain parts of the state.
The Forest Health News zones have changed too, so check out which counties each zone covers.