Yield of pod sizes 1 through 4, expressed in terms of percentage of total yield, appears to be a practical measure of maturity for GV 50, Blue Lake 274, and Salem; but a different standard is required for Green Isle. For all four varieties in this trial, however, yield of pod sizes 1 through 4, expressed in terms of percentage of total yield, had a straight-line relationship, suggesting that field sampling for two or three days several days ahead of harvest time can be used to predict when a desired maturity (expressed in terms of percentage of pod sizes 1 through 4) will be reached.

Cooperators included Thomas M. Little, U.C. Extension Biometrician; Richard and James Naumann; Kenneth Bahns of Santa Clara Chemical Company; and Arthur Letherman and Luther Morris of California Consumers Corporation.