GDD base 50 accumulated since April 1 = 3853 (+284 departure from normal) at Mountain Grove 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 Grapevine phenology and GDD accumulation (last one for 2011)