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The application of a juvenile hormone analog, methoprene, to newly emerged adult males reduced the time required for sexual maturation and enhanced mating success in several species of tephritid fruit ßies. In this work, we investigated the effect of topical methoprene application on West Indian fruit ßy, Anastrepha obliqua (Macquart), male calling, mating, and volatile release. Males treated with topical methoprene exhibited sexual maturation and reproductive behavior 2 d earlier when compared with control males treated with acetone. Methoprene-treated males began calling and mating at 4 d old, whereas control males did not call and mate until 6 d old. The gas chromotographyÐ mass spectrometry analysis of volatiles showed that during calling A. obliqua males consistently released four compounds; three of them were identiÞed as (Z)-3-nonenol, (Z,E)- -farnesene, (E,E)- -farnesene, and a fourth compound with the appearance of a farnesene isomer. Both treated and control males released the same compounds, although treated males started to release volatiles before that control males. The results are discussed in view of possible methoprene application with the aim of reducing costs in ßy emergence and release facilities before eventual release of A. obliqua in the Þeld, thus improving the sterile insect technique. Inglés

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