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.
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”
T. Davis Sydnor, The Ohio State University, Bugwood.org
Scientific Name: Corylus colurna
Native to: southeast Europe and western Asia
Mature Height*: 40-55’
Form: conical, symmetrical, medium texture
Growth Rate*: medium (35 feet over a 20-year period)
Foliage: 3-5”, dense green, simple leaf
Fall Color: poor, yellowish-green
Flowers: inconspicuous; catkins in early spring can be rather handsome
Continue reading “Feature species: Turkish filbert”
By Dan Buckler, DNR urban forest assessment specialist, Madison, firstname.lastname@example.org, 608-445-4578
Jack Frost descends upon us all in Wisconsin, but the depths to which he brings the mercury differ depending on your latitude, elevation, and proximity to water or urban areas. These differences are observed in a location’s cold hardiness zone, which represents the average minimum temperature a location is expected to experience.
Cold hardiness zones are well-known decision-making factors for anybody with a smidge of green on their thumb. But did you know that there are multiple hardiness zone maps out there, and that where you stand right now might be in zone 6 on one map, but zone 5 on another? Enter the labyrinth, dear reader.
Continue reading “Cold hardiness zone maps: how many versions are there, and how are they different?”
Paul Wray, Iowa State University, Bugwood.org
Scientific name: Quercus bicolor
Native to: northeastern quarter of the U.S. (including southern Wisconsin)
Mature Height*: 50-60+’
Form: broad, wide-spreading
Growth Rate*: slow to moderate; 12”-18” per year
Foliage: 5”-6”; glossy green above, white below; leathery with shallow, irregular lobes; leaves often persist into winter
Fall Color: yellow-brown to orange-brown
Continue reading “Feature species: swamp white oak”
By Elly Voigt, forest health lab assistant, Fitchburg
Beech leaf disease (BLD) is a relatively recently discovered, destructive disease of beech trees in the US. It was first observed in 2012 in Ohio and has since spread to areas of Pennsylvania, New York, Connecticut, Rhode Island, Massachusetts and Ontario, Canada. BLD affects our native beech species, American beech (Fagus grandifolia) and ornamental beech species, including European beech (Fagus sylvatica). The disease has not yet been observed in Wisconsin but could become an issue in the future.
Symptomatic leaf puckering of a beech tree with BLD. Credit: Ohio State University.
Continue reading “Be on the lookout for beech leaf disease”
Credit: Steven Katovich, Bugwood.org
Scientific name: Celtis occidentalis
Native to: east-central U.S. (includes Wisconsin)
Mature Height*: 30’-60’
Form: broadly and irregularly oval, approximately the vase shape of American elm
Growth Rate*: medium to fast; up to 24”-36” per year
Foliage: 2”-5”; lopsided oval with serrated edge
Fall color: yellow-green to yellow
Continue reading “Feature species: hackberry”
By Bernie Williams, invasive plants and earthworms specialist, Madison, Bernadette.Williams@wisconsin.gov, 608-444-6948
As the weather warms up and more of us are out in our gardens digging around, it seems like a good time to learn a few things about those fascinating and beautiful worms you keep encountering.
Nightcrawlers have reddish-pink bodies and can be 6-8 inches long when mature.
Continue reading “All about earthworms: nightcrawler edition”
By Mike Hillstrom, forest health specialist, Fitchburg, Michael.Hillstrom@wisconsin.gov, 608-513-7690
What’s the orange goo on that tree?!
Should I fight or should I flee?
I bet forest health staff can ID!
The spore-producing, slimy, orange gall caused by cedar apple rust fungus.
Continue reading “What’s that orange goo?!”
By Todd Lanigan, forest health specialist, Eau Claire, Todd.Lanigan@wisconsin.gov, 715-210-0150
With the onset of spring and snow melt, you may have noticed bark missing at the base of trees and shrubs. This is most commonly noticed on sections of bark that were below the snow line. This damage, known as girdling, was caused by mice and rabbits feeding on the bark during the winter.
Mouse girdling damage at base of tree surrounded by older greyish-black wound.
Continue reading “Mouse, rabbit and squirrel damage from winter”
To keep everyone safe and healthy during this pandemic, the Arbor Day Foundation is suspending the requirement to hold a public Arbor Day celebration in 2020. Communities will be able to maintain their Tree City/Campus/Line designations without meeting this standard.
As an alternative to a public gathering, we encourage you to use social media to celebrate trees and their many benefits. Social media is an excellent tool for spreading the message that trees and tree care/management are vitally important to our communities. You could design your own campaign on a theme such as the health benefits of trees or how to properly plant a tree, or you could simply copy one or more of the messages below.
Feel free to cut and paste the following text and photos for your own social media campaign for Arbor Day – or any day of the year!
Message #1: (only valid through Arbor Day, April 24th): Celebrate Arbor Day by planting a tree from your couch! Post a photo of your favorite tree on social media, tag @arborday, and use the hashtag #arbordayathome. The Arbor Day Foundation will plant a tree on your behalf. Learn more at celebratearborday.com.
Continue reading “Celebrate Arbor Day using social media (check out our suggested posts below)”