Utah State University Extension
Apple maggot is not currently a pest of commercial orchards in Utah, but it is regulated as a quarantine insect in the state. If it becomes established in commercial fruit production areas, its presence can inflict substantial economic harm through loss of export markets. Infestations cause fruit damage, may increase insecticide use, and can result in subsequent disruption of integrated pest management programs.
Alston, Diane and Murray, Marion, "Apple Maggot" (2013). All Current Publications. Paper 845.