Russian knapweed biological control success with host specific wasps and midges

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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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