Agriculture & Agri-Food Canada
Size: Up to 1/2 inch long
Where/When: Primarily feeds on apples and large crabapples. Appears in early July and is active until September. Peak activity occurs from late July through early August.
Significance: Causes distorted fruits due to oviposition activity of the adult fly. Pulp breaks down, discolors, and starts to rot as a result of maggots tunneling through the flesh. Larvae are rarely, if ever, seen.