A fi eld test carried out in an industrial greenhouse in Lithuania revealed the attractiveness of synthetic methyl salicylate (MeSa) to two dipteran species: the vinegar fl y, Drosophila busckii (Drosophilidae), and the cluster fl y, Pollenia rudis (Calliphoridae). The attractant for the former fl y species was especially effective, as sticky traps containing 0.25 ml of MeSa captured (814 ± 55) D. busckii fl ies/trap on average compared to (12 ± 4) fl ies/trap in control traps. The mean capture of P. rudis [(42 ± 4) fl ies/trap] was signifi cantly higher in MeSa-baited traps compared to the control traps [(13 ± 4) fl ies/trap]. The presence of MeSa in emissions of many fruits suitable for D. busckii feeding allows to attribute this attractant to kairomones. In case of P. rudis, MeSa should be attributed to synomones (compounds benefi cial for both receiver and sender), because adult fl ies feeding on fl owers act as pollinators. This is the fi rst report on the fi eld-active attractant for D. busckii and the second for P. rudis.
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