Coriander Derived <i>E</i>-2-Decenal Repels Fall Armyworm through Dedicated Olfactory Coding Involving SfruOBP13

The <i>Spodoptera frugiperda</i> Smith (Lepidoptera: Noctuidae) is a globally invasive pest, and its management is primarily dependent on chemical pesticides, which has spurred the need for eco-friendly control strategies. The push-pull strategy, an environmentally friendly pest management approach, has shown promise in controlling <i>S. frugiperda</i>. In this study, using a combination of adult oviposition, larval feeding, and electrophysiological tests, we confirmed the repellent properties of coriander and its volatiles. Gas chromatography-mass spectrometry analysis of coriander volatiles revealed <i>E</i>-2-decenal as the major repellent compound. Furthermore, SfruOBP13 was identified as one of the main odorant-binding proteins that detects <i>E</i>-2-decenal in the <i>S. frugiperda</i>, providing a molecular basis for the insect's perception of this volatile. These findings lay the groundwork for developing behavior-based pest control strategies, offering valuable insights for sustainable <i>S. frugiperda</i> management using plant-derived semiochemicals.