Several different formulations of the synthetic pheromone (grandlure) ofAnthonomus gandisBoheman were prepared and tested in the laboratory and field in an attempt to prolong effectiveness of attractant in traps. Of those tested, two extended the effective trap life of attractant for periods greater than one week: (1) a physical-barrier preparation that consisted of a cigarette filter impregnated with grandlure in a solution of polyethylene glycol 1000 (20.4 percent), glycerol (32.3 percent), water (12.8 percent), and methanol (34.5 percent), and contained in an open one-dram glass vial; and (2) a commercial gel formulation. Plastic preparations tested did not improve significantly on the grandlure formulations.