Definition of "psyllid"

Psyllids, sometimes called 'suckers', may either be regarded as constituting a single large family (sensu stricto) of about 2000 species, or else about eight closely related families (sensu lato).

1987, Dennis S. Hill, Agricultural Insect Pests of Temperate Regions and Their Control, page 207

The acacia psyllid, Acizzia uncatoides (Ferris & Klyver) (formerly Psylla uncatoides), feeds primarily on the young terminal growth of Acacia and Albizia species.

1995, J. W. Beardsley, K. S. Hagen, J. R. Leeper, R, L. Tassan, 17: Acacia Psyllid, James Robert Nechols (editor), Biological Control in the Western United States, page 91

Psyllids extract large quantities of sap from the plant as they feed and produce copious amounts of honeydew.

2006, Elizabeth Grafton-cardwell, Asian Citrus Psyllid, ANR Publication 8205, University of California Division of Agriculture and Natural Resources, page 3