Harold T. Reynolds is Professor of Entomology, University of California, Riverside; Edward S. Sylvester is Professor of Entomology, U.C., Berkeley; Ken Kido is Staff Research Associate, Cooperative Extension, U. C., Riverside; Marshall W. Johnson is Post-graduate Research Assistant, Department of Entomology, University of California, Riverside; Eric T. Natwick is Farm Advisor, Cooperative Extension, Imperial County. Nick C. Toscano is Pest Management Program Director, Cooperative Extension, University of California, Riverside;