GDD base 50 accumulation since April 1 = 2384. 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 Photos and stages to be uploaded shortly. … [Read more...] about Grape phenology and GDD accumulation