Grape phenology and GDD accumulation

July 29, 2020 by Marilyn Odneal

GDD base 50 = 1923 at http://agebb.missouri.edu/weather/reports/gddTable.asp

Phenology stages described according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

N Norton E-L Stage 33 Berries still hard and green.

G Norton E-L Stage 33 Berries still hard and green.

G Cabernet Sauvignon E-L Stage 33 Berries still hard and green.

MVEC Sunbelt E-L Stage 33 Berries still hard and green.

MVEC Chambourcin E-L Stage 33 Berries still hard and green.

W Catawba E-L Defruited

NWV Chardonel E-L Stage 33 Berries still hard and green.

R Seyval Blanc E-L Stage 34 Berries begin to soften; Sugar starts increasing.

R Seyval Blanc E-L Stage 34 Berries begin to soften; Sugar starts increasing.

R. Norton E-L Stage 33 Berries still hard and green.

F Vivant E-L Stage 34 Berries begin to soften; Sugar starts increasing.

F Norton E-L Stage 33 Berries still hard and green.

F Vignoles E-L Stage 33 Berries still hard and green.

F Chambourcin E-L Stage 33 Berries still hard and green.

F Chardonel E-L Stage 33 Berries still hard and green.

F Vidal Blanc E-L Stage 33 Berries still hard and green.

F Traminette E-L Stage 33 Berries still hard and green.

F Cayuga White E-L Stage 34 - 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge. — F Cayuga White E-L Stage 34 – 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge.

D Concord E-L Stage 33 Berries still hard and green.

D Mars E-L Stage 35 – 36 Berries begin to soften; sugar starts increasing to Berries begin to colour and enlarge to Berries with intermediate sugar levels.