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10-Minute Presentation

Physiology, Biochemistry, and Toxicology

10-min: PBT, IPM and Insecticide Resistance

Resistance of a Puerto Rican fall armyworm (Spodoptera frugiperda) (Lepidoptera: Noctuidae) strain to Iindoxacarb, a voltage-dependent sodium channel blocker

Sunday, November 9, 2025
10:36 AM - 10:48 AM Pacific
Location: Oregon Convention Center, F152, OCC
Oral Presentation
Spodoptera frugiperda (J.E. Smith), commonly known as the fall armyworm (FAW), is one of the most destructive pests affecting corn and causing significant economic damage across the Americas, Asia, Africa, and Oceania. Its wide host range, ability to migrate over long distances, multiple generations per year, and substantial pesticide selection pressure have led to resistance against 44 active ingredients, spanning more than eight modes of action (www.pesticideresistance.org), with 272 documented cases. Indoxacarb, a voltage-dependent sodium channel blocker, is a valuable tool for managing FAW. However, its long-term effectiveness is at risk due to the intense artificial selection. In island-like conditions such as those in Puerto Rico, our research identified field-evolved resistance of FAW to indoxacarb through overlay-diet bioassays, showing resistance ratios (RR50 and RR90) of 54-fold and 51-fold, respectively, compared to a susceptible population. Moreover, we investigated the role of detoxification enzymes (P450s, esterases, glutathione transferases, and ABC transporters) in the resistance of FAW from Puerto Rico to indoxacarb. These insights could support the implementation of integrated resistance management (IRM) strategies in areas invaded by FAW.