In order for a plant to initiate chemical responses to herbivory,

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In order for a plant to initiate chemical responses to herbivory, volatile "signal" compounds must be perceived. These compounds can come from the saliva or waste of an herbivore, as well as from the plant itself in response to damage. The perception of these compounds then triggers a cascade of chemical reactions within the plant that lead to the production of defensive compounds. While gene-for-gene recognition and the release of phytoalexins may also be involved in plant responses to herbivory, they are not always necessary for the initial initiation of these responses.

In Order for a Plant to Initiate Chemical Responses to Herbivory