Grape Phenology and GDD accumulation

August 8, 2022 by Jennifer Morganthaler

GDD base 50 = 2503 . We track GDD at http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System https://door.extension.wisc.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

Norton N E-L Stage 33-35 33 Berries still hard and green to Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Mars Demo E-L Stage 36-37 Berries with intermediate sugar values to Berries not quite ripe

Concord Demo E-L Stage 34-35 34 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Vivant F E-L Stage 35 Berries begin to colour and enlarge

Norton F E-L Stage 34-35 34 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Vignoles F E-L Stage 35-36
Berries begin to colour and enlarge to Berries with intermediate sugar values

Chambourcin F E-L Stage 35-36Berries begin to colour and enlarge to Berries with intermediate sugar values

Chardonel F E-L Stage 35-36 Berries begin to colour and enlarge to Berries with intermediate sugar values

Vidal Blanc F E-L Stage 34-35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Traminette F E-L Stage 34-35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Cayuga White F E-L Stage 37-38 Berries not quite ripe to Berries harvest-ripe

Norton R E-L Stage 34-35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Catawba R 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

Seyval Blanc E-L Stage 38 Berries harvest-ripe

Chardonel W E-L Stage Berries begin to colour and enlarge

Catawba W E-L Stage 33-34 Berries still hard and green to berries begin to soften; Sugar starts to increase

NC-6 G E-L Stage 33 Berries still hard and green

Norton G E-L Stage 34-35 34 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge

Sunbelt MVEC E-L Stage 35-36 Berries begin to colour and enlarge to Berries with intermediate sugar values

Chambourcin MVEC E-L Stage 35-37 Berries begin to colour and enlarge to Berries with intermediate sugar values to Berries not quite ripe