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In 1973, Montana released a gall fly to control spotted knapweed; decades later, the biocontrol program was linked to over 3 times more hantavirus-positive deer mice - The Times of India

A biological control project started half a century ago to destroy a stubborn invasive weed accidentally set off an ecological chain reaction that increased human exposure to a deadly virus. In 1973, wildlife officials and agricultural scientists in Montana released two species of European gall flies, Urophora affinis and Urophora quadrifasciata, to control the spread of spotted knapweed (Centaurea stoebe).

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