GDD base 50 = 125 at http://agebb.missouri.edu/weather/reports/gddTable.asp Phenology stages described according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf Due to the freeze on April 18 I did not evaluate the stages. It looks as though the vineyard with the most surviving primaries is Norton in the North vineyard. It … [Read more...] about Grape phenology and GDD accumulation