Resistance of Acacia to the Acacia Psyllid, Psylla uncatoides

Abstract

Thirty-one species of Acacia were quantitatively evaluated in the field at San Jose, CA, for resistance to the acacia psyllid, Psylla uncatoides (Ferris and Klyver). This insect causes foliage necrosis and dieback of the tips of susceptible Acacia. A few species exhibited no infestation by the insect, many were found highly to moderately resistant, and several were confirmed highly susceptible. Propagation and use of horticulturally desirable species of Acacia, locally adapted and with high resistance to the psyllid, are recommended where this pest occurs.