Ingestion of HGL-DTGs is negatively correlated with hornworm larval performance. Dotted bars: RP-HPLC-UV (λ = 210 nm) relative area percentage of HGL-DTGs (means ± se, n = 9, area of the peaks at 24–28 min/area of thymols' peak × 100) of the methanolic extract of the leaves from plants not attacked by herbivores. White bars: hornworm larval mass (milligrams; means ± se; n = 40; in the beginning of the assay) after 14 d of feeding on N. attenuata plants inoculated with A. tumefaciens GV3101 carrying pTV00, pTVGGPPS, or pTVFPPS. ***, Significant differences from pTV00 at P < 0.0001.