GDD base 50 accumulation count beginning April 1 = 3885 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 This is the final phenology observation for 2016. We have had unseasonable warm weather through October with no freezing temperatures. The … [Read more...] about Grape phenology and GDD accumulation