GDD base 50 accumulation count beginning April 1 = 2162 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 Xiangqing (Mina) Tang, Suo (Phoebe) Dong, Zhong (Edward) Zhang, and Hongrui (Terry) Wang recorded phenology today as they did last … [Read more...] about Grape phenology and GDD accumulation