GDD base 50 accumulation for May 29 = *** (agebb was down and GDD was not available). 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   … [Read more...] about Grape phenology and GDD accumulation