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Whitehall Biological Weed Control Project: Spotted Knapweed

Spotted knapweed (Centaurea stoebe) is one of the most widespread noxious weeds in Montana, occurring in all 56 counties. Spotted knapweed was probably originally brought to the United States through contaminated alfalfa shipments and discarded ballast soil from cargo ships. This noxious weed arrived in America in the late 19th century and began appearing in Montana in the 1920s, where it has...
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whitehallledger.com broke the news in Whitehall, United States on Tuesday, June 16, 2026.
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