TY - JOUR AU - van den Bosch, Robert AU - Schlinger, E. I. AU - Dietrick, E. J. TI - Imported parasites established: Natural enemies of the spotted alfalfa aphid brought from the Middle East in 1955–56 now established in California JF - California Agriculture JO - Calif Agr Y1 - 1957/07/01 VL - 11 IS - 7 SP - 11 EP - 12 PB - University of California Agriculture and Nature Resources SN - 0008-0845 UR - http://www.ucanr.edu/sites/calagjournal/archive/?article=ca.v011n07p11 AB - Three imported wasp species—parasites of the spotted alfalfa aphid—have survived their first winter in southern California alfalfa fields and have become abundant in several localities.