APRIL 1, 2026

GDD base 50 = 16 . We track GDD at http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System https://door.extension.wisc.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

E-L Stage 2 Bud Swell

E-L Stage 3 Wooly Bud

E-L Stage 4 Bud Burst

E-L Stage 7 First leaf separated from shoot tip

E-L Stage 9 2 to 3 leaves separated; shoots 2-4 cm long