Enhanced modelling of swede midge population dynamics in North America

Researcher: Rebecca Hallett, University of Guelph, Guelph ON

Project Code: CARP CCC 2016.18

Final Report: September 2019

Summary: Swede midge has been an economically significant pest of Brassica crops in ON, QB, NS, and PEI since 2000. An insect with swede midge like appearance has also been observed in SK and MB since 2007 and 2008. This pest could become an emerging issue for major canola production regions in western Canada. Since the development of the initial "MidgEmerge" model in 2009, new knowledge has been gained on factors that affect swede midge population dynamics. An updated model with new parameters can allow more accurate predictions for different regional conditions and populations of swede midge, and this will enable better informed decisions on pest management timing and crop rotations. A three-year study conducted by the University of Guelph and AAFC researchers revised the existing model "MidgEmerge" and developed a more accurate prediction model "MidgEmergeII". Research data indicated that when a high number of adults coincided with days of high temperatures, egg laying would increase and result in higher damage levels in the current year and outbreak-level populations of adults in the subsequent year.

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