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Russian knapweed biological control success with host specific wasps and midges
December 16, 2022
Dan Bean, Melanie Mollack, Sonya Daly
By Sonya Daly, Dan Bean and Melanie Mollack of the Colorado Department of Agriculture, Conservation Services, Biological Control Program. Russian knapweed (Rhaponticum repens) is a nonnative weed in the western United States. It was introduced in the late 1800’s and is now invading and degrading cropland, rangeland, riparian areas, and roadsides.
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