Swede midge is considered an endemic and common pest of cruciferous vegetable crops (e.g. cabbage, cauliflower, broccoli, and Brussels sprouts), often causing severe losses. It has also been reported on rutabaga, turnip, radish, horseradish, kale, canola, collard, field mustard, and many common weed species, including pennycress, wild mustard, wild radish, Sheppard's purse, and yellow rocket.
In Europe, this pest can cause serious economic damage and/or crop loss of Brassica and other related crucifers with vegetable crops being especially hardest hit. Farmers in Ontario first started to see heavy losses (85%) in broccoli in 1996, but the cause was mistakenly attributed to nutrient deficiencies.
The swede midge is not known to occur in Indiana.