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.

Rusty Crayfish (Orconectes rusticus)

Rusty Crayfish (Orconectes rusticus)

Rusty crayfish are native to streams in the Ohio River Basin states of Ohio, Kentucky, Illinois, Indiana, and Tennessee.  They were introduced to Wisconsin by anglers who used them as fishing bait. These crayfish impact native crayfish populations, aquatic plant...

Curly Leaf Pondweed (Potamogeton crispus)

Curly Leaf Pondweed (Potamogeton crispus)

Curly Leaf Pondweed is one of 80 pondweed species found within the world.  It is native to Eurasia, Africa and Australia.  It was accidently introduced with the common carp in the early 1800’s and made its way to Wisconsin in 1905 with fish imported from Europe. This...