There was an article I read like a decade ago about some research that when bugs eat a particular tree, the tree would react in two ways: Emit some sort of che

There was an article I read like a decade ago about some research that when bugs eat a particular tree, the tree would react in two ways: Emit some sort of chemical that hurt or resisted the bug, and emit something (can't remember if it was sound or something pheremone-like) that caused nearby trees of the same species to emit the same chemical, allowing them to proactively protect themselves.