Figure 1. Photographs and life history diagram showing the phoretic association between eriophyoid mites and psyllids.

(a) Phoretic mites associated with adult psyllids during the winter. (b) Phoretic mites dismounted from psyllids and forming galls on the host plant in early spring. (c) The galls on the host plant caused by eriophyoid mites in summer. (d) Phoretic mites hidden under the abdomen of a 5th instar psyllid nymph in autumn. (e) The life history of an eriophyoid mite that can be phoretic on a psyllid and accompany the host during the hibernation period.