Onion maggot fly activity and oviposition along field edges with and without bordering forest was investigated. Sticky traps extending in transects from these edges were used to monitor flight activity for all three generations in 2002 and 2003. Flight activity was higher in fields bordered by forest than in those that were not. Activity declined with increasing distance from the edge in all fields. This edge effect lessened as the season progressed. Oviposition was also quantified in the edges and centers of these fields in 2003. Similar numbers of eggs were laid on plants regardless of their proximity to the field edge or the presence or absence of bordering woods. Based on these results, control strategies targeting onion maggot adults should focus on field edges.
Species 1: Diptera Anthomyiidae Delia antiqua (onion maggot)
Keywords: landscape ecology, dispersal
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