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What's happening in the field?

At the Missouri State Fruit Experiment Station

Grape Phenology and GDD accumulation

May 30, 2023 by Jennifer Morganthaler

GDD base 50 =594. 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 

Demo Mars E-L Stage 18 14 leaves separated; flower caps still in place,
but cap colour fading from green
Demo Concord E-L Stage 20 10% Caps off
Demo Concord E-L Stage 27 27 Setting; young berries enlarging (>2 mm
diam.), bunch at right angles to stem
Demo Mars E-L Stage 25 80% caps off
Foundation Vignoles E-L Stage 21 30% caps off
Foundation Vidal Blanc E-L Stage 15 8 leaves separated, shoot elongating rapidly;
single flowers in compact groups
Foundation Traminette E-L Stage 13 6 leaves separated
Foundation NC-6 E-L Stage 17 12 leaves separated; inflorescence well
developed, single flowers separated
Foundation Chardonel E-L Stage 17 12 leaves separated; inflorescence well
developed, single flowers separated
Foundation Chambourcin E-L Stage 15 8 leaves separated, shoot elongating rapidly;
single flowers in compact groups
Foundation Cayuga White E-L Stage 15-16 8 leaves separated, shoot elongating rapidly; single flowers in compact groups
to 10 leaves separated
New Winery Norton E-L Stage 17 12 leaves separated; inflorescence well
developed, single flowers separated
New Winery Chambourcin E-L Stage 25-27 80% caps off to Cap-fall complete to Setting; young berries enlarging (>2 mm
diam.), bunch at right angles to stem
MVEC Sunbelt E-L Stage 27 Setting; young berries enlarging (>2 mm
diam.), bunch at right angles to stem
MVEC Chambourcin E-L Stage 15-16 8 leaves separated, shoot elongating rapidly; single flowers in compact groups
to 10 leaves separated
Genomics Norton E-L Stage 15-16 8 leaves separated, shoot elongating rapidly;
single flowers in compact groups
to 10 leaves separated
Genomics NC-6 E-L Stage 15 8 leaves separated; shoot elongating rapidly;
single flowers in compact groups
Foundation Vivant E-L Stage 17 12 leaves separated; inflorescence well
developed, single flowers separated
Foundation Norton E-L Stage 17-18 12 leaves separated; inflorescence well
developed, single flowers separated
to 14 leaves separated; flower caps still in place,
but cap colour fading from green
Winery Chardonel E-L Stage 19-20 About 16 leaves separated; beginning of
flowering (first flower caps loosening)
to 10% caps off
Winery Catawba E-L Stage 17 12 leaves separated; inflorescence well
developed, single flowers separated
Research Seyval Blanc E-L Stage 14 7 leaves separated
Research Norton E-L Stage 16-17 10 leaves separated to 12 leaves separated; inflorescence well
developed, single flowers separated
Research Catawba E-L Stage 12-14 5 leaves separated; shoots about 10 cm long;
inflorescence clear
to 6 leaves separated
to 7 leaves separated
North Norton E-L Stage 19 About 16 leaves separated; beginning of
flowering (first flower caps loosening)

Filed Under: Grapes, Phenology

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  • Grape Phenology and GDD accumulation
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