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What's happening in the field?

At the Missouri State Fruit Experiment Station

Grape Phenology and GDD accumulation

April 10, 2026 by Jennifer Morganthaler

APRIL 1, 2026

GDD base 50 = 16 . 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

E-L Stage 2 Bud Swell

Research Norton
New Winery Norton
North Norton
Genomics Norton Blanc

E-L Stage 3 Wooly Bud

Genomics Norton
Genomics CH x CS
Genomics NC-65
Foundation Traminette
Foundation Norton Blanc
Foundation Norton
New Winery Chambourcin

E-L Stage 4 Bud Burst

Foundation Vidal Blanc
Genomics J70

E-L Stage 7 First leaf separated from shoot tip

Demo Mars
Demo Concord
Research Catawba

E-L Stage 9 2 to 3 leaves separated; shoots 2-4 cm long

MVEC Catawba
Foundation Vivant
Foundation Vignoles
Foundation Orion
Foundation Chardonel
Foundation Chambourcin
Foundation Cayuga White
WInery Catawba
MVEC Sunbelt
Genomics J x V

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Filed Under: Grapes, Phenology

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