Untargeted metabolomics profiling of oat ( Avena sativa L.) and wheat ( Triticum aestivum L.) infested with wheat stem sawfly ( Cephus cinctus Norton) reveals differences associated with plant defense and insect nutrition.

We propose that the species differences found here likely affect the survival of WSS larvae and may also be associated with differences in stem architecture at the molecular level. Our findings suggest pathways to focus on for future studies in elucidating plant response to WSS infestation.