Learning to Speak Shrub
A few months later, Karban, a professor at the University of California, Davis who studies plant defense communication, returns to the sagebrush and examines its leaves, many of which now have damage from real grasshoppers or beetles. However, within about two feet of the branches he clipped, leaves have been spared the worst ravages of the hungry insects. That’s because Karban’s cuttings convinced those damaged leaves they were under insect attack, so they sent chemical alarms into the air.
Neighboring leaves intercepted and deciphered the code messages, and began prepping their own defenses against the bugs.