Technical Abstract: Tests were conducted to evaluate capture of Anastrepha spp fruit flies in Multilure traps baited with synthetic food-based lures. Traps were baited with putrescine and varying doses of ammonium acetate or ammonium bicarbonate. Captures in these traps were compared with capture in Multilure traps baited with standard liquid protein baits. Choice and no-choice, laboratory and field tests were used to compare among a variety of environmental and experimental conditions, and a subset of field-collected flies were dissected to determine maturity of captured flies. Results from these studies will be used to develop improved trapping systems for Anastrepha spp fruit flies.