GDD base 50 accumulated since April 1 = 3495
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

N Norton E-L Stage 37 Berries not quite ripe.

MVEC Delaware E-L Stage 43 Beginning of leaf fall

MVEC Valvin Muscat E-L Stage 43 Beginning of leaf fall

MVEC Sunbelt E-L Stage 40 After harvest before complete cane maturation.

MVEC Chambourcin E-L Stage 40 After harvest before complete cane maturation.

W Catawba E-L Stage 40 After harvest before complete cane maturation.

R Seyval Blanc E-L Stage 40 Stage 43 Beginning of leaf fall

R Catawba E-L Stage 40 After harvest before complete cane maturation.

F Vignoles E-L Stage 43 Beginning of leaf fall

F Chardonel E-L Stage 43 Beginning of leaf fall

F Traminette E-L Stage 43 Beginning of leaf fall

F Cayuga White E-L Stage 43 Beginning of leaf fall

D Concord E-L Stage 40 After harvest before complete cane maturation.

D Vivant E-L Stage 43 Beginning of leaf fall

D Vidal Blanc E-L Stage 40 After harvest before complete cane maturation.

D Mars E-L Stage 43 Beginning of leaf fall