GDD base 50 accumulation count beginning April 1 = 3793 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 The last vineyard to be harvested was the North Nortons on October 19th. Photos and stages will be included in the last observation at the … [Read more...] about Grape phenology and GDD accumulation