Forum: Evaluation of Loss of (+)-Disparlure from Gypsy Moth (Lepidoptera: Lymantriidae) Pheromone Dispenser Tapes Under Field Conditions in Florida

James L. Nation, John L. Foltz, Wayne N. Dixon, Heather J. McAuslane

Abstract


The residual pheromone content of laminated plastic, pheromone-dispensing tapes impregnated with (+)-disparlure, the sex pheromone of the gypsy moth, Lymantria diapar (L.), was assessed after exposure to field conditions in Gainesville. As determined by gas chromatography, lure tapes deployed on 26 August 1991 rapidly lost pheromone during the first 2 months in the field. Loss of pheromone was considerably less for the remaining 4-month exposure period (28 October 1991 to 3 March 1992). Lure tapes at 5 locations differed slightly in their rates of pheromone loss, and traps placed on the north side of tree trunks retained more pheromone than traps placed on the south side. These data indicate that a pheromone lure used for monitoring gypsy moth during spring and early summer in north Florida may lose its effectiveness rapidly and may have to be replaced more often than is currently recommended for other regions of the country.

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