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At the Missouri State Fruit Experiment Station

Grape phenology and GDD accumulation

July 26, 2021 by Marilyn Odneal

GDD base 50 = 1740. We track GDD at  http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the phenology stages according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

The stage for the majority of grapes is 33 – Berries still hard and green. Mars is undergoing veraison.

Mars table grape is undergoing veraison, changing color signaling the beginning of ripening.
Mars table grape is undergoing veraison, changing color signaling the beginning of ripening.

Filed Under: Grapes, Phenology

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