GDD base 50 = 3633. We track GDD at http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf This is the last post for the year. We had 3633 GGD accumulate since April 1. … [Read more...] about Grape Phenology and GDD accumulation