Reiterative and interruptive signaling in induced plant resistance to chewing insects

► We review insect-derived cues that plants perceive as actual or impending herbivory. ► Early cues include insect walking, oviposition, and the presence of predators. ► Feeding cues from oral secretions may amplify or reduce the expression of defenses. ► Induced resistance is, in some cases, transmitted to successive generations. ► Here we present a model where plant defense level varies in response to insect cues.