Abstract
This chapter deals with the damage caused by mites, discusses the structure and functioning of their mouthparts, and analyses plant damage at the cellular level. All plant parts, except the roots, may be attacked by eriophyoid mites. Eriophyoid mites are highly specific; they live and multiply only on susceptible host plant species that are usually closely related. These compatible interactions lead to a great variety of well-documented plant symptoms. . The presence of dead cells as a result of mite feeding activities has been noticed in almost all mite galls and in russeting. But the occurrence of a peculiar cell death of punctured cells was only established recently. The main role imputed to chitosan as an exogenous elicitor in this process does not exclude eventual effects of other molecules coming from the injured cell wall itself, and therefore considered as endogenous elicitors. These substances may act alone or are synergized and trigger the host cell response. Cell-to-cell communication is set in motion and defined biochemical, physiological, cytological, and morphological processes determine the plant–mite interaction.
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