Grape Phenology and GDD accumulation

July 11, 2022 by Jennifer Morganthaler

GDD base 50 =1660 . 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

North Norton E-L Stage 33 Berries still hard and green

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

Concord Demo E-L Stage 33-34 Berries still hard and green to Berries begin to soften;
Sugar starts increasing

Vivant Foundation E-L Stage 33 Berries still hard and green

Norton Foundation E-L Stage 33 Berries still hard and green

Vignoles Foundation E-L Stage 32-33 Beginning of bunch closure, berries touching
(if bunches are tight
to Berries still hard and green

Chambourcin Foundation E-L Stage 33 Berries still hard and green

Vidal Foundation E-L Stage 33-34 Berries still hard and green to berries begin to soften;
Sugar starts increasing

Chardonel Foundation E-L Stage 33 Berries still hard and green

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

Cayuga White F E-L Stage 33-34 Berries still hard and green to berries begin to soften;
Sugar starts increasing

Norton Research E-L Stage 32-33 Beginning of bunch closure, berries touching
(if bunches are tight)
33 Berries still hard and green

Catawba Research E-L Stage 33-34 Berries still hard and green to Berries begin to soften;
Sugar starts increasing

Seyval Blanc Research E-L Stage 32-33 Beginning of bunch closure, berries touching (if bunches are tight) to Berries still hard and green

Chardonel Winery E-L Stage 33 33 Berries still hard and green

Catawba Winery E-L Stage 33 33 Berries still hard and green

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

Norton Genomics E-L Stage 33 33 Berries still hard and green

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

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