University of Minnesota, Department of Entomology
Size: 1/4 inch long
Where/When: Primarily feeds on apples and large crab apples. 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 by adult flies. Pulp breaks down, discolors, and starts to rot as a result of maggots tunneling through the flesh.