The swede midge (Contarinia nasturtii) is an introduced pest of brassicas that was discovered in North America in 2000. Currently, C. nasturtii is present in Erie, Genesee, Orleans, and Niagara counties in western New York and 15 counties in Ontario and 20 counties in Quebec, Canada. The Massachusetts Department of Agricultural Resources (MDAR) and University of Massachusetts Extension have been surveying for this pest in Massachusetts as part of the USDA, APHIS Cooperative Agricultural Pest Survey (CAPS). This past summer they found the swede midge for the first time in Massachusetts. Two specimens were captured in Hampshire County: one specimen in a garden in Northampton and the other in Hadley.
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Update December 20, 2005: Only ONE specimen (the one in the Northampton garden with mixed brassica species) was confirmed by DNA sequencing at Cornell University to be Contarinia nasturtii. Please visit this link for more information: