Grape Phenology and GDD accumulation - What's happening in the field?

What's happening in the field?

At the Missouri State Fruit Experiment Station

Grape Phenology and GDD accumulation

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Grape Phenology and GDD accumulation

GDD base 50 =1542 . 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.pd

Most of the grapes are at E-L Stage 33 Berries still hard and green. Mars is the first one to enter veraison this year.

We dropped the fruit on all vines except those listed below in order maintain the health of the vines due to the extreme cold kill this year.  We do not want to stress the vines and they the amount of fruit that did set was small, so we are trying to keep them healthy for a good crop next year.

North Norton E-L Stage 33 Berries still hard and green
Research Norton E-L Stage 33 Berries still hard and green
MVEC Sunbelt E-L Stage 33 Berries still hard and green
Genomics Norton E-L Stage 33 Berries still hard and green
Foundation Norton E-L Stage 33 Berries still hard and green
Foundation Chambourcin E-L Stage 33 Berries still hard and green
Demo Mars E-L Stage 35 Berries begin to colour and enlarge
Demo Concord E-L Stage 33 Berries still hard and green