Invasive Species

After decades of work, fishery managers say lake trout have fully recovered in most of Lake Superior after the invasive, fish-killing sea lamprey decimated their numbers.

PJ Liesch, manager of the University of Wisconsin-Madison Insect Diagnostic Lab, told Larry Meiller recently that this is the best year he can recall for praying mantid sightings.

Invasive carp have been detected for the first time in the lower Chippewa and Black rivers in western Wisconsin.

The Environmental Protection Agency finalized ballast water standards on Tuesday that would require new, but not existing lake vessels in the Great Lakes to install treatment systems to prevent the spread of invasive species.

Efforts to curb invasive Eurasian watermilfoil with herbicides may cause more harm than good, researchers said.

Illinois has signed a key agreement with the state of Michigan and U.S. Army Corps of Engineers that will advance a $1.15 billion project to keep invasive carp out of the Great Lakes.

Over the last few weeks, spongy moth caterpillars have been dying off in some parts of Wisconsin — thanks to rainy weather hurting the invasive species.

State forest health experts say it’s likely an invasive tree-killing beetle has spread to every county in Wisconsin, which has already killed most ash trees in roughly one-third of the state.

Wisconsin saw its worst spongy moth outbreak in more than a decade last year, and the state could see a repeat this year unless spring rains help decrease their population.

The Wisconsin Department of Natural Resources and the University of Wisconsin-Madison developed the tool in 2021 to prevent oak wilt advancement in a time of unpredictable weather.