Invasive Species

Non-Native Invasive Species in Forest County

TERRESTRIAL:

  • Purple Loosestrife
  • Garlic Mustard
  • Wild Parsnip
  • Common Tansy
  • Buckthorn
  • Japanese Knotweed
  • Spotted Knapweed
  • Reed Canary Grass
  • Phragmites
  • Japanese barberry
  • Emerald Ash Borer
  • Earthworms
  • Jumping Worms

AQUATIC (AIS):

  • Eurasian Milfoil
  • Yellow Floating Heart
  • Curly Leaf Pondweed
  • Rusty Crayfish
  • Zebra Mussels
  • Spiny Water Flea
Invasive Species By Lake

View this page to check lakes in your area for invasive species.

Phragmites in Forest County

Conservation Corner Conservation Corner is a weekly article produced by the Forest County Land &Water Conservation Department. For more information contact Steve Kircher, County Conservationist-Land Information/GIS Director at 715-478-1387 or by e-mail at...

Golden Rod

Conservation Corner Conservation Corner is a weekly article produced by the Forest County Land &Water Conservation Department. For more information contact Steve Kircher, County Conservationist-Land Information/GIS Director at 715-478-1387 or by e-mail at...

Blue-Green Algae

Conservation Corner is a weekly article produced by the Forest County Land &Water Conservation Department. For more information contact Steve Kircher, County Conservationist-Land Information/GIS Director at 715-478-1387 or by e-mail at .   My...

Spotted Lanternfly Alert

The Spotted Lanternfly is an invasive species native to Asia. In 2014 it was found in Pennsylvania and has since spread to multiple counties which are now quarantined. If you see a spotted lanternfly, kill it, squash it, smash it...just get rid of it. In the fall,...

European Frog-bit

Earlier this summer, botanists discovered a population of the wetland invasive plant European frog-bit (Hydrocharis morsus‐ranae) in Oconto County. This is the first time this species, which is widespread along the coastal areas of lakes Erie and Huron up to the...

Purple Loosestrife control

This week we finished mapping the county roads for Wild Parsnip and Purple Loosestrife locations.  We noted that the Wild Parsnip has bolted (flowered and gone to seed) and is pretty much done causing problems for the year.  Next spring, we will begin...

Wisconsin Caterpillars

Every summer at my household, my wife collects milkweed and monarch butterfly eggs.  She’ll put the milkweed and eggs in a large terrarium and then has her daycare monitor their growth and transformation from caterpillars to butterflies.  She usually is able...

Oak Wilt Disease

 Tips for helping to prevent oak wilt disease It’s best to avoid cutting, pruning or damaging oak trees this time of year to prevent the spread of oak wilt disease. Oaks are most vulnerable to the disease during the growing season, especially from April 1 to July 15....