Herbivore-specific, density-dependent induction of plant volatiles: honest or "cry wolf" signals?

Our experiments reveal that cabbage seedlings also show such a positive response to the density of CWB caterpillars ( Figure 4a ): with an increase in CWB density, the total amount of all induced volatiles together increased significantly and the amounts of some induced volatiles increased, two significantly ( Figure 4a ) and one almost significantly (limonene, see Table S4 ).

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