Figure 1. Laboratory studies reveal benzenoid compounds emitted from plants in response to stresses.

A) Emission rates of seven benzenoid compounds emitted from Populus balsamifera in response to heat stress (left) and spider mite stress followed by heat stress (right). B) Heat-stress induced benzenoids from the Jülich controlled environment plant chamber containing three tree species (Pinus sylvestris, Picea abies, and Betula); C) Benzenoids from Populus tremula L. × tremuloides Michx. induced by larvae-feeding stress. Detailed descriptions of measurements can be found in the Supplementary Methods (S2).