Grape phenology and GDD accumulation

June 8, 2015 by Marilyn Odneal

GDD base 50 accumulated since April 1 = 774
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 27 Setting; young berries enlarging, bunch at right angles to stem.

MVEC Delaware E-L Stage 29 Berries pepper-corn size; bunches tending downwards.

MVEC Valvin Muscat E-L Stage 27-29 Setting to berries pepper-corn size.

MVEC Sunbelt E-L Stage 32 Beginning of bunch closure.

MVEC Chambourcin E-L Stage 27-29 Setting to berries pepper-corn size.

W Catawba E-L Stage 29-31 Berries pepper-corn to pea size.

R Vidal Blanc E-L Stage 26-29 Cap fall complete to berries pepper-corn size.

R Seyval Blanc E-L Stage 29-31 Berries pepper-corn to pea size.

R Catawba E-L Stage 31 Berries pea size.

F Vignoles E-L Stage 26 Cap fall complete.

Chardonel E-L Stage 29-31 Berries pepper-corn to pea size.

F Traminette E-L Stage 27 Setting; young berries enlarging, bunch at right angles to stem.

F Cayuga White E-L Stage 31 Berries pea size.

D Concord E-L Stage 31 Berries pea-size.

D Vivant E-L Stage 29-31 Berries pepper-corn to pea size.

D Mars E-L Stage 29 Berries pepper-corn size; bunches tending downward.