DISRUPTION OF PHEROMONE COMMUNICATION THROUGH THE USE OF PUFFERS FOR CONTROL OF BEET ARMYWORM (LEPIDOPTERA, NOCTUIDAE) IN TOMATOES

Puffer machines were designed for the release at 30-min intervals of p uffs of a 2-component pheromone blend of the beet armyworm, Spodoptera exigua (Hubner), from pressurized canisters. Pheromone components wer e (Z,E)-9,12-tetradecadienyl acetate and (Z)-9-tetradecenol in a 9:1 r atio, The amount of communication disruption attributable to the resul ting pheromone permeation of the ail above puffer protected blocks of tomatoes was measured by comparing the numbers of male moths of the be et armyworm that located living females or synthetic beet armyworm lur es used as bait ill traps in the centers of these blocks with the numb ers captured in similar traps in untreated blocks. When 40 puffers wer e positioned at 160-m separations only around tile perimeters of 256-h a blocks of tomatoes (plus cotton), providing a pheromone release rate of 46 mg/ha/d, complete disruption of premating pheromone communicati on was achieved. A 60-ha block of tomatoes was provide with 117 puffer s for 11 wk, during most of tile period of tomato plant growth auld ma turation. The block received. 266 mg of pheromone/ha/d. Greater than 9 9% communication disruption was achieved, measured by the reduction in numbers of male moths captured in female- or lure-baited traps. Beet armyworm egg masses laid by female moths in the treated block were 76% fewer than in a nonprotected, control block.