Apple Maggot Adult Dispersion in a New Brunswick Apple Orchard

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Abstract
The daily emergence of adult apple maggots, Rhagoletis pomonella (Walsh), from laboratory-held pupae was marked with fluorescent powder en masse, and released in 1 end of an orchard each day for 11 successive days. Of approximately 2800 marked adults released, 607 were re-captured on Bird Tanglefoot®-treated traps and on a similarly treated barrier outside the orchard. Examination of trees with ultraviolet lights at night immediately following release resulted in finding only a small percentage of marked adults scattered throughout the orchard. Examination of traps indicated that marked adults had been captured in all traps situated in all bearing trees in the orchard. Examination of the barrier indicated that of the marked and orchard-emerged flies which left the or-chard, 77% were captured at 8-14 feet above ground.

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