; ; ; ; ; ; G. H. Kaloostian is Research Leader, and G. N. Oldfield and H. D. Pierce are Research Entomologist and Agricutural Research Technician, respectively, USDA-ARS, Boyden Entomology Laboratory, Riverside; E. C. Calavan, A. L. Granett, G. L. Rana, and D. J. Gumpf are Professor and Plant Pathologist, Postgraduate Research Plant Pathologist, Research Associate, Plant Pathologist (from Department of Plant Pathology, University of Bari, Italy); and Assistant Professor and Plant Pathologist, respectively, Department of Plant Pathology, University of California, Riverside. This research was supported in part by a grant from the California Citrus Advisory Board to the University of California.