GDD base 50 accumulation since April 1 = 3669. 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 Arandel and Aromella are not listed here. They did not perform well at our location, so they were removed. The actual photos were taken on November … [Read more...] about Grape phenology and GDD accumulation