GDD base 50 accumulation for today = 3868 http://agebb.missouri.edu/weather/reports/gddTable.asp Phenology stages according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf We continue to harvest the rest of the Norton this week. All other cultivars have been harvested. Sugar accumulation was lower than normal in most cases. … [Read more...] about Grape phenology and GDD accumulation