Grape Phenology and GDD accumulation

August 25, 2025 by Jennifer Morganthaler

GDD base 50 = 2789 . 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

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

Genomics Norton E-L Stage 35-36. 35 Berries begin to colour and enlarge. 36 Berries with intermediate sugar values.

Genomics NC-6 E-L Stage 35 Berries begin to colour and enlarge.

Genomics NC-65 E-L Stage 36 Berries with intermediate sugar values.

Genomics J x V E-L Stage 36 Berries with intermediate sugar values.

Genomics J 70 E-L Stage 36 Berries begin to colour and enlarge.

Genomics CH x CS E-L Stage 36 Berries with intermediate sugar values.

Foundation Vidal Blanc E-L Stage 35-36. 35 Berries begin to colour and enlarge. 36 Berries with intermediate sugar values.

Foundation Norton E-L Stage 35-36. 35 Berries begin to colour and enlarge. 36 Berries with intermediate sugar values.

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

Foundation NC-6 E-L Stage 35 Berries begin to colour and enlarge.

Demo Concord E-L Stage 36-37. 36 Berries with intermediate sugar values. 37 Berries not quite ripe.

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