Microctonus aethiopoides, a braconid parasite of adult alfalfa weevil, Hypera postica, is now established in southeastern Minnesota. Releases were made near Caledonia in Houston County, in 1978 and 1979, and near Rosemount in Dakota County, in 1979 and 1980. M. aethiopoides was recovered in Houston County in 1979, a new state record, and since has expanded its range more than 40 km from the release site. Establishment in Dakota County was unexpected because of low host densities, but parasites were recovered there in 1983. Other workers have recovered M. aethiopoides in Olmstead County.
Radcliffe, Edward B.; Cuperus, Gerrit W.; and Flessel, John K.
"Establishment of the Alfalfa Weevil Parasite Microctonus Aethiopoides (Hymenoptera: Braconidae) in Michigan,"
The Great Lakes Entomologist, vol 16
Available at: https://scholar.valpo.edu/tgle/vol16/iss4/5