GDD base 50 accumulation for today = 1532 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 Japanese beetles are extremely severe and several cultivars are greatly affected, primarily those with upright growth. … [Read more...] about Grape Phenology and GDD Accumulation