We discovered that an oviposited Arabidopsis plant sends a root-mediated signal to neighboring plants. This signal activates resistance against the foliar pathogen Pseudomonas syringae. Whether this phenomenon benefits hatching larvae is an exciting hypothesis that will deserve further investigation.
Orlovskis and Reymond (2020) Pieris brassicae eggs trigger inter‐plant systemic acquired resistance against a foliar pathogen in Arabidopsis. New Phytologist 228: 1652-1661.