Content tagged with "invasive species"

Cut-Leaved Teasel

Photo of cut-leaved teasel plants showing white flowering heads.
Currently, invasive teasels in our state occur mainly along highways, but these aggressive weeds can outcompete native plants, especially in prairies and savannas. Their spines protect them from being eaten by most herbivores, so it’s up to humans to check their spread. More

Cut-Leaved Teasel (Flowerheads)

Photo of cut-leaved teasel, blooming flowerhead, showing white flowers.
Cut-leaved teasel typically has white flowers. It was first recorded in our state in 1968, when it apparently had sprouted from seeds spread from a cemetery wreath to a nearby fencerow. But there have undoubtedly been numerous introductions since then. It is robust, aggressive, and is spreading rapidly along highways and other open habitats. More

Cut-Leaved Teasel (Leaves)

Photo of cut-leaved teasel showing deeply pinnately lobed leaves.
The deeply cut, pinnately lobed stem leaves explain the name of cut-leaved teasel. More

Deer Tracks

Deer tracks showing both hoof and dewclaws
Compared to rounded hog tracks, deer tracks are more elongated from tip to heel. If deer dewclaws show in the track, they typically do not register wider than the hoof. More


photo of didymo
“Didymo” or “rock snot” is an invasive alga that forms large, thick mats on the bottom of lakes and streams, smothering aquatic life vital to the food chain that supports many fish species, including trout. More


Photo of man holding a wad of didymo
Didymosphenia geminata, an invasive algae, forms slimy mats that smother fish eggs and makes water sports unpleasant. More

Didymo Control

This fact sheet shows you how to identify and control didymo, a type of invasive algae commonly known as "rock snot." which can cover stream bottoms, smothering fish eggs, degrading water quality and affecting fishing success. More

Ditch the Invasive Hitchhikers

Camping and boating travelers beware! More

Do Pigs Have Wings?

This content is archived
"The time has come," the Walrus said, "To talk of many things: Of shoes--and ships--and sealing wax Of cabbages--and kings--And why the sea is boiling hot--And whether pigs have wings" - Lewis Carroll More

Don't Dump That Bait!

This content is archived
Let’s keep invasive species from colonizing new waters. More