COMPARATIVE EFFECTIVENESS OF 3 TRAP MODELS TO MONITOR THE APPLE MAGGOT, RHAGOLETIS-POMONELLA (WALSH), (DIPTERA, TEPHRITIDAE), IN QUEBEC

The effectiveness of the Great Lakes(R) red sphere trap, the Ladd(R) t rap, and the Pherocon(R) AM trap to monitor apple maggot, Rhagoletis p omonella (Walsh) activity was studied at 14 sites. The Great Lakes and the Ladd traps were baited with synthetic volatiles, whereas the Pher ocon AM trap was prebaited with protein hydrolysate and ammonium aceta te. Orchard management practices at these sites varied from heavy reli ance on insecticides to insecticide-free programs. The Great Lakes and the Ladd trap detected apple maggot activity earlier than the Pheroco n AM trap, however this was not statistically significant. When apple maggot pressure was low, only the Great Lakes and Ladd traps were able to detect the presence of flies. The attractiveness of the Ladd traps to flies was not affected by pest management practices, whereas pest management practices significantly affected the sex ratios of flies ca ptured by the Pherocon AM and the Great Lakes traps.