F. M. Ashton is Associate Professor of Botany and Associate Botanist in the Experiment Station, Department of Botany, University of California, Davis; L. K. Mann (deceased) was Professor of Vegetable Crops and Olericiulturist in the Experiment Station, Department of Vegetable Crops, University of California, Davis; A. R. Saghir is Research Assistant, Department of Vegetable Crops, University of California, Davis; W. S. Seyman is Farm Advisor, Santa Clara County; H. B. Collins is Farm Advisor, San Benito County; R. H. Tyler is Farm Advisor, San Benito County; L. E. Allen is Farm Advisor, Lassen County;