Montana’s weed-control fly was linked to 3x more hantavirus-positive mice

Controlling invasive spotted knapweed biologically has initiated an unexpected ecological chain reaction. Gall flies, introduced as a control measure, have turned into a vital winter food source for deer mice, causing a surge in their populations and an uptick in hantavirus spread. Areas dense with knapweed report more infected mice than those with native grasslands.

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