GDD base 50 accumulated since April 1 = +503 (+213 departure from normal) at Mountain Grove http://agebb.missouri.edu/weather/reports/gddTable.asp March 2012 GDD base 50: 306+503 = 809 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