Abstract
The apple maggot, Rhagoletis pomonella (Walsh), is present throughout the major commercial fruit-growing counties (Mesa and Delta) of Colorado. A trapping program was initiated in 1987 to evaluate the host status of the apple maggot in Colorado and to compare the efficacy of the various trap types. No apple maggot adults were trapped in commercial apple orchard locations. Trap catches were low in abandoned apple orchard locations compared with trap catches in adjacent native hawthorn, Crataegus rivularis Nutt. No larvae or pupae were obtained from apple fruit collected from unsprayed abandoned orchards. At this time, it appears that the apple maggot has not successfully expanded its host range to include apples in Colorado. Red spheres baited with butyl hexanoate did not trap more apple maggot adults than Pherocon AM traps in July, but baited spheres trapped more adults than Pherocon AM traps in the months of August and September. Red baited spheres did not trap more adults than red unbaited spheres throughout the entire season.
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