ScienceDaily https://www.sciencedaily.com/releases/2021/02/210217151011.htm

An enzyme in the saliva of certain insects prevents their food plants from warning neighboring plants of an attack

Source:

Penn State

Summary:

Like a scene from a horror movie, …

It appears that the vibrations caused by insect feeding can elicit chemical defenses in plants. Arabidopsis thaliana  pre-exposed to vibrations caused by caterpillar feeding had higher levels of glucosinolate and anthocyanin defenses when …

Science https://phys.org/news/2019-07-defend-insects-leaky-gut-syndrome.html

by Pennsylvania State University Plants may induce "leaky gut syndrome"—permeability of the gut lining—in insects as part of a multipronged strategy for protecting …