GDD base 50 accumulated since April 1 = 0 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 All grape cultivars in E-L stages 1 (winter bud) or 2 (bud scales opening). … [Read more...] about Grape phenology and GDD accumulation