Invasive Species I.D. and Impacts

Explore below to learn about identification and impacts of several invasive species in Wisconsin.

Terrestrial Plants

Aquatic Plants

Plant Diseases

Animals


Terrestrial Plants

Use the UW Online Weed Key to help identify invasive plants: videowebsite
Visit this story map to access species distribution maps, additional I.D. information, and priority species in your county.
Biennial thistles: fact sheet
Black locust (Robinia pseudoacacia): fact sheet
Black swallow-wort (Vincetoxicum nigrum): videofact sheet
Buckthorns: fact sheet
Bush honeysuckles (Lonicera sp.): videofact sheet
Impacts of bush honeysuckles: video
Canada thistle (Cirsium arvense): videofact sheet
Common tansy (Tanacetum vulgare): videofact sheet
Common teasel (Dipsacus foullonum): videofact sheet
Creeping bellflower (Campanula rapunculoides): videofact sheet
Crown vetch (Securigera varia): videofact sheet
Dame’s rocket (Hesperis matronalis): videofact sheet
Garden valerian (Valeriana officinalis): video
Garlic mustard (Alliaria petiolata): videofact sheet
Hill mustard (Bunias orientalis): videofact sheet
Japanese hedge-parsley (Torilis japonica): videofact sheet
Japanese hop (Humulus japonicus): videofact sheet
Japanese knotweeds (Polygonum cuspidatum): fact sheet
Leafy spurge (Euphorbia esula): videofact sheet
Oriental bittersweet (Celastrus orbiculatus): fact sheet
Perennial pepperweed (Lepidium latifolium): videofact sheet
Poison hemlock (Conium maculatum): videofact sheet
Purple loosestrife (Lythrum salicaria): fact sheet
Spiny plumeless thistle (Carduus acanthoides): videofact sheet
Spotted knapweed (Centaurea stoebe): videofact sheet
Wild chervil (Anthriscus sylvestris): videofact sheet
Wild parsnip (Pastinaca sativa): videofact sheet


Aquatic Plants

Invasive Aquatic Plants Introduction: video
Water Hyacinth (Eichhornia crassipes), Water Lettuce (Pistia stratiotes), & Parrot Feather (Myriophyllum aquaticum): video
Eurasian Watermilfoil (Myriophyllum spicatum): video
Starry Stonewort (Nitellopsis obtusa): video


Plant Diseases

Plant diseases that are impacting or have the potential to impact natural areas and native vegetation:

Aster yellows: videofact sheet
Boxwood blight: video
Dutch elm disease: videofact sheet
Impatiens downy mildew: videofact sheet
Late blight: fact sheet
Impacts of late blight: video
Powdery mildews: videofact sheet
Southern blight: videofact sheet
Tar spot: videofact sheet
Thousand cankers disease: videofact sheet
Tobacco mosaic: video
Tobacco rattle: videofact sheet
Tomato chlorotic dwarf: video
Verticillium wilt: videofact sheet


Animals

Emerald Ash Borer (Agrilus planipennis)

Gypsy Moth

  • Impacts and history of gypsy moth in Wisconsin: video

Jumping Worm (Amynthas sp.)

Feral Pigs (Sus scrofa)