Grape phenology and GDD accumulation

August 29, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 2832 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 36 Berries with intermediate sugar levels.

G Norton E-L Stage 36 Berries with intermediate sugar levels.

G Cabernet Sauvignon E-L Stage 36 Berries with intermediate sugar levels.

MVEC Delaware E-L Stage 38 Berries harvest ripe.

MVEC Valvin Muscat E-L Stage 38 Berries harvest ripe.

MVEC Sunbelt E-L Stage 38 Berries harvest ripe.

MVEC Chambourcin E-L Stage 37 Berries not quite ripe.

W Catawba E-L Stage 35 Berries begin to colour and enlarge.

NWV Arandel E-L Stage 39 Berries overripe.

NWV Aromella E-L Stage 39 Berries overripe.

R Seyval Blanc E-L Stage 40 After harvest, canes maturing.

R Catawba E-L Stage 35 - 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels. — R Catawba E-L Stage 35 – 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels.

F Vignoles E-L Stage 40 After harvest, canes maturing.

F Chardonel E-L Stage 40 After harvest, canes maturing.

F Traminette E-L Stage 38 Berries harvest ripe.

F Cayuga White E-L Stage 40 After harvest, canes maturing.

D Concord E-L Stage 37 Berries not quite ripe.

D Vivant E-L Stage 40 After harvest, canes maturing.

D Vidal Blanc E-L Stage 38 Berries harvest ripe.

D Mars E-L Stage 40 After harvest, canes maturing.