Along with gaseous phytohormones induced by herbivory, VOCs including a wide array of low molecular weight terpenes and green leaf volatiles function as airborne signals within and between plants . Such signals allow receiver plants to tailor their defenses to their current and expected risks caused by herbivores. On occasion, receiver plants do not show immediate changes in their level of defenses, but respond stronger and faster than non-receiver plants when damaged by herbivores