Gordon W. Frankie is Professor, Department of Entomology, University of California, Berkeley; James I. Grieshop is Community Education Specialist, Cooperative Extension, UC Davis; Carlton S. Koehler is Entomologist, Cooperative Extension, UC Berkeley; J. Kenneth Grace was formerly a graduate student. Department of Entomology, UC Berkeley; Kathleen Hesketh was formerly Farm Advisor. UC Cooperative Extension. Alameda County;