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What's happening in the field?

At the Missouri State Fruit Experiment Station

Grape Phenology and GDD accumulation

July 14, 2025 by Jennifer Morganthaler

GDD base 50 = 1616 . 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

NC-6 Genomics E-L Stage 34-35. 34 Berries begin to soften; Sugar starts increasing.
35 Berries begin to colour and enlarge.
NC-65 Genomics E-L Stage 33 Berries still hard and green.
Vivant Foundation E-L Stage 33 Berries still hard and green.
Vignoles Foundation E-L Stage 34-35. 34 Berries begin to soften; Sugar starts increasing.
35 Berries begin to colour and enlarge.
Vidal Blanc Foundation E-L Stage 35 Berries begin to colour and enlarge.
Traminette Foundation E-L Stage 33 Berries still hard and green.
Orion Foundation E-L Stage 35 Berries begin to colour and enlarge.
Norton New Winery E-L Stage 33 Berries still hard and green.
Norton Genomics E-L Stage 33 Berries still hard and green.
Norton Foundation E-L Stage 33 Berries still hard and green.
NC-6 Foundation E-L Stage 33-34. 33 Berries still hard and green. 34 Berries begin to soften; Sugar starts increasing.
Mars Demo E-L Stage 35 Berries begin to colour and enlarge.
J x V Genomics E-L Stage 35 Berries begin to colour and enlarge.
J 70 Genomics E-L Stage 35 Berries begin to colour and enlarge.
Concord Demo E-L Stage 33 Berries still hard and green.
CH x CS Genomics E-L Stage 33 Berries still hard and green.
Chardonel Foundation E-L Stage 35 Berries begin to colour and enlarge.
Chambourcin New Winery E-L Stage 33 Berries still hard and green.
Chambourcin Foundation E-L Stage 33 Berries still hard and green.
Cayuga White Foundation E-L Stage 34-35. 34 Berries begin to soften;
Sugar starts increasing
35 Berries begin to colour and enlarge.
Catawba Winery E-L Stage 33-34. 33 Berries still hard and green. 34 Berries begin to soften;
Sugar starts increasing.

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