swede midge (diptera: cecidomyiidae), ten years of invasion of crucifer crops in north america.the swede midge, contarinia nasturtii kieffer (diptera: cecidomyiidae), a common insect pest in europe, is a newly invasive pest in north america that constitutes a major threat to cruciferous vegetable and field crops. since its first identification in ontario, canada, in 2000, it has rapidly spread to 65 counties in the provinces of ontario and quebec and has recently been found in canola (one of two cultivars of rapeseed, brassica napus l. and brassica campestris l.) in the central prairie re ...201121735885
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