GDD base 50accumulated since April 1 = 679 http://agebb.missouri.edu/weather/reports/gddTable.asp Phenology stages according to the modified E-L System http://door.uwex.edu/files/2010/modifiedEichhornLorennzsystem.pdf Photos and stages were recorded by Vickie Baumer who is working on her graduate student internshiop through Texas Tech here at the Missouri State Fruit … [Read more...] about Grape phenology and GDD accumulation