Lauren D. Anderson is Associate Entomologist, University of California College of Agriculture, Riverside; Luther G. Jones is Associate Specialist, Department of Agronomy, University of California College of Agriculture, Davis; Harold T. Reynolds is Assistant Entomologist, University of California College of Agriculture, Riverside; Ray F. Smith is Assistant Professor of Entomology, University of California College of Agriculture, Berkeley; John E. Swift is Extension Entomologist, University of California College of Agriculture, Berkeley;