Grape phenology and GDD accumulation

May 14, 2012 by Marilyn Odneal

GDD base 50 accumulated since April 1 = +503 (+213 departure from normal) at Mountain Grove http://agebb.missouri.edu/weather/reports/gddTable.asp

March 2012 GDD base 50: 306+503 = 809

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

N Traminette E-L Stage 26-27

N Concord E-L Stage 29-31

N Sunbelt E-L Stage 31

N Norton E-L Stage 23

MVEC Chambourcin E-L Stage 26-27

MVEC Valvin Muscat E-L Stage 26-27

W Catawba E-L Stage 29-31

R Vignoles E-L Stage 26-29

R Cayuga White E-L Stage 29-31

R Vidal Blanc E-L Stage 26-29

R Seyval Blanc E-L Stage 29-31

R Catawba E-L Stage 31

D Chardonel E-L Stage 26-27

D Vivant E-L Stage 26-29

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