Over the past 20 years, the swede midge (SM), Contarinia nasturtii (Diptera: Cecidomyiidae) has emerged as one of the major threats to canola production in Ontario and Quebec, causing damage by feeding on the growth points. In 2016, a parasitoid of the SM, Synopeas myles (Hymenoptera: Platygastridae), was discovered in Canada. A research project is currently underway in Quebec and Ontario to evaluate its distribution and effectiveness as a mean of controlling SM populations. Canola plants showing symptoms of infestation were collected from different regions and at different times during the season. Damaged parts were cut and placed in emergence containers to count SM and S. myles to evaluate parasitism rates. Results showed that S. myles was present in all sampled areas and occasionally at high rates of parasitism. Knowledge on this parasitoid will help improve current pest management practices against swede midge.