Economic Research Institute Study paper
Utah State University
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Until just recently, the apple maggot (Rhagoletis pomonella) has not been a serious pest in Utah fruit crops. It was first discovered in 1967, but was remote from existing orchards. The first recorded findings in Utah orchards did not occur until 1983 while the Utah Department of Agriculture was conducting survey studies of the western cherry fruit fly (Rhagoletis indifferens).
Bond, Larry K.; Glover, T. F.; Jorgensen, Clive D.; and Hatch, Anthony H., "The Economic Impact of the Apple Maggot and Western Cherry Fruit Fly on Utah's Fruit Industry" (1984). Economic Research Institute Study Papers. Paper 404.