Howard D. Ohr is Exterision Plant Pathologist, Cooperative Extension, University of California, Riverside. Margaret K. Murphy is Staff Research Associate, Cooperative Extension, University of California, Riverside. Emmylou M. Krausman is Staff Research Associate, Department of Plant Pathology, University of California, Riverside. John Van Dam is Farm Advisor, Cooperative Extension, San Bernardino County. Robert M. Endo is Professor and Plant Pathologist, Department of Plant Pathology, University of California, Riverside.