Grape phenology and GDD accumulation

August 8, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 2354 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 33 - 35 Berries still hard and green to Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — N Norton E-L Stage 33 – 35 Berries still hard and green to Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

G Norton E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — G Norton E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

G Cabernet Sauvignon E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — G Cabernet Sauvignon E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

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

MVEC Valvin Muscat E-L Stage 34-35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

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

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

W Catawba E-L Stage 34 Berries begin to soften, sugar starts increasing.

NWV Arandel E-L Stage 38 Berries harvest ripe.

NWV Aromella E-L Stage 38 Berries harvest ripe.

R Seyval Blanc E-L Stage 38 Berries harvest ripe.

R Catawba E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — R Catawba E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

F Vignoles E-L Stage 38 Berries harvest ripe.

F Chardonel E-L Stage 38 Berries harvest ripe.

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

F Cayuga White E-L Stage 38 Berries harvest ripe.

D Concord E-L Stage 34 - 35 Berries begin to soften, Sugar starts increasing to Berries begin to colour and enlarge. — D Concord E-L Stage 34 – 35 Berries begin to soften, Sugar starts increasing to Berries begin to colour and enlarge.

D Vivant E-L Stage 38 Berries harvest ripe.

D Vidal Blanc E-L Stage 35 - 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels. — D Vidal Blanc E-L Stage 35 – 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels.

D Mars E-L Stage 38 Berries harvest ripe.