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The first specimen of pale pink swallowtail grass has been discovered in Wisconsin, prompting urgent action to prevent its spread.

A new invasive vine species has been discovered in parts of Wisconsin, raising alarm, and state officials say quick action is crucial to ensure it remains a small outbreak or a long-term environmental problem.

The first known populations of pale swallowtail grass in Wisconsin were confirmed by the Department of Natural Resources in Shawano and Oconto counties.

What's happened?

According to NBC26, the pests were discovered in an area near Krakow, on the border of Oconto and Shawano counties. Information on the pest sightings was first entered into the Early Detection and Distribution Mapping System (EDDMapS) by the Timberland Invasives Partnership.

State officials said "a prompt response is critical to preventing the spread of this species in Wisconsin," especially because these cases mark "the first known populations in the state.".

Although the scaly-sided vine is related to the milkweed, it doesn't play the same beneficial role in local habitats. The Department of Natural Resources stated that this vine can overtake forests and meadows, crowding out native vegetation and making it difficult for native species to survive.

Once invasive vines become established, they can spread aggressively, making control much more expensive and labor-intensive.

Why is this important?

Officials say the plant could be a dead end for monarch butterflies: Adults can lay eggs on the pale pink swallowtail, but the hatched caterpillars don't survive.

Monarch butterflies are part of a pollinator network that maintains the health of landscapes, homesteads, and agricultural systems. When invasive species disrupt this balance, communities can face habitat degradation, increased land management costs, and decreased native biodiversity.

According to Wisconsin's invasive species regulations, the pale dwarf rhinoceros is classified as a prohibited species, meaning it is illegal to transport, import, or possess in the state.

What is being done?

Anyone who believes they have discovered the pale swallowtail should email the Department of Natural Resources at Invasive.Species@wisconsin.gov with clear photographs of the plant and its location. Reports can also be submitted via EDDMapS.

Early detection of a new invasive species can significantly improve land managers' chances of containing it before it spreads.

Residents can also help by learning to identify vines, preventing the spread of suspicious plants, and checking yards or natural areas for anything they suspect is crowding out nearby vegetation. Even a single report with photos can help experts quickly confirm a sighting.

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