GDD base 50 = 83 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 have taken photos of the buds, but did not evaluate the stages. I will be looking at the number of primary buds/shoots that survived … [Read more...] about Grape phenology and GDD accumulation