Behavioral responses of Drosophila suzukii to blends of its attractants

<i>Drosophila suzukii</i> poses a significant threat to soft-skinned fruits worldwide. Effective trapping of this pest largely depends on commercially available lures, which often capture not only <i>D. suzukii</i> but also other species. Previously, we identified phenylacetaldehyde, spermidine, and pyridine as specific attractants for <i>D. suzukii</i> . Here we tested mixtures of these odorants and found that a blend of all three odorants did not produce any attraction. However, mixtures of phenylacetaldehyde with either spermidine or pyridine, but not spermidine with pyridine, triggered significant attraction. These findings can guide the formulation of more effective lures for <i>D. suzukii</i> .