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What's happening in the field?

At the Missouri State Fruit Experiment Station

First frost and grapevine phenology and GDD accumulation

October 8, 2012 by Marilyn Odneal

The first frost occurred yesterday, October 7 when it dropped to 30.4 degrees F at 7:05am.

GDD base 50 accumulated since April 1 = +3919 (+472 departure from normal) at Mountain Grove http://agebb.missouri.edu/weather/reports/gddTable.asp

March 2012 GDD base 50: 306+3919 = 4225

Phenology stages according to the Modified E-L system http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

N Traminette E-L Stage 41
N Traminette E-L Stage 41
N Concord E-L Stage 41
N Concord E-L Stage 41
N Sunbelt E-L Stage 41
N Sunbelt E-L Stage 41
N Norton E-L Stage 41
N Norton E-L Stage 41
MVEC Chambourcin E-L Stage 40
MVEC Chambourcin E-L Stage 40
W Catawba E-L Stage 40
W Catawba E-L Stage 40
R Vignoles E-L Stage 41
R Vignoles E-L Stage 41
R Cayuga White E-L Stage 41
R Cayuga White E-L Stage 41
R Vidal Blanc E-L Stage 40
R Vidal Blanc E-L Stage 40
R Seyval Blanc E-L Stage 40
R Seyval Blanc E-L Stage 40
R Catawba E-L Stage 40
R Catawba E-L Stage 40
F Chardonel E-L Stage 40
F Chardonel E-L Stage 40

Filed Under: Grapes, Phenology

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  • Grape Phenology and GDD accumulation
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