Wisconsin
Invasive plants, animals and pests are taking a toll on Wisconsin’s lakes, rivers and landscapes. The DNR is working with citizens and partners to slow the spread of invasive species. Through educational outreach, strategic planning and active management we are protecting our environment and economy from invasives.
— Wisconsin DNR
State Contacts
Top Reported Species
Common tansy | 6,823 |
Common carp | 4,525 |
Canada thistle | 3,333 |
Spotted knapweed | 2,024 |
Phragmites (Invasive) | 1,565 |
Common buckthorn | 1,104 |
Wild parsnip | 1,084 |
Garlic mustard | 999 |
Purple loosestrife | 798 |
European swamp thistle | 704 |
Recent Observations
- Brown marmorated stink bug in Milwaukee County, WI on December 27, 2023
- Phragmites (Invasive) in Brown County, WI on October 16, 2023
- Phragmites (Invasive) in Brown County, WI on October 16, 2023
- Eurasian watermilfoil in Brown County, WI on October 16, 2023
- Curly pondweed in Brown County, WI on October 16, 2023
Prohibited Species
- Asian loeseneri bittersweet
- Blotched snakehead
- Bullseye snakehead
- Chevron snakehead
- Dwarf snakehead
- Floating marsh pennywort
- Monk parakeet
- Rainbow snakehead
- Red shiner
- Spotted snakehead
- Stigonematales
Restricted Species
- Arctic char
- Atlantic salmon
- Brown trout
- Chinese hi-fin banded shark
- Chinook salmon
- Coho salmon
- Eastern mosquitofish
- Pink salmon
- Rainbow trout
- Spiny naiad
- Sterlet
- Tiger trout
- Tilapia
- Tubenose goby
- Western mosquitofish