Abstract
The phenology of the adult apple maggot associated with its three main hosts in Utah (sweet cherry, Prunus avium L., tart cherry, P. cerasus L., and black hawthorn, Crataegus douglasii Lind!.) was investigated. The emergence curves of apple maggots associated with these three hosts were similar on a physiological time (degree-day, DD) scale (6.7°C base), but on a calendar basis, populations in different parts of the state emerged up to 4 wk apart. Emergence curves of cumulative percentage were fit to an Erlang density distribution function with Del = 1,180 DD and K = 65. The ovarian maturity curve had the same shape, but occurred about 112 DD after the emergence curve. Published emergence curves for apple maggot populations from Ontario, New York, and Oregon were similar to those of the Utah populations if the first consistent trap catch was used to synchronize degreeday accumulations. Wisconsin populations were found to differ by about 256 DD (at 50% emergence) from Utah populations even when the model was synchronized as above.
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