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

Grape phenology and GDD accumulation

March 20, 2017 by Marilyn Odneal

We usually begin grape phenology on April 1st, but since development is a bit early this year, we will begin on this first day of Spring.

GDD base 50 accumulation count begins April 1 in this resource. We will calculate the March data by hand and add it to our April 1 count http://agebb.missouri.edu/weather/reports/gddTable.asp

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

N Norton E-L Stage 1 Winter bud

G Norton E-L Stage 2 Bud scales opening

G Cabernet Sauvignon E-L Stage 2 Bud scales opening

MVEC Delaware E-L Stage 1-2 Winter bud to Bud scales opening

MVEC Valvin Muscat E-L Stage 2 Bud scales opening

MVEC Sunbelt E-L Stage 1-2 Winter bud to Bud scales opening

MVEC Chambourcin E-L Stage 1-2 Winter bud to Bud scales opening

W Catawba E-L Stage 1-2 Winter bud to Bud scales opening

NWV Arandel E-L Stage Stage 1-2 Winter bud to Bud scales opening

NWV Aromella E-L Stage Stage 1-2 Winter bud to Bud scales opening

R Seyval Blanc E-L Stage 2 Bud scales opening

R Catawba E-L Stage 1-2 Winter bud to Bud scales opening

F Vignoles E-L Stage 1 Winter bud

F Chardonel E-L Stage 2 Bud scales opening

F Traminette E-L Stage 1 Winter bud

F Cayuga White E-L Stage 2 Bud scales opening

D Concord E-L Stage 1-2 Winter bud to Bud scales opening

D Vivant E-L Stage 1-2 Winter bud to Bud scales opening

D Vidal Blanc E-L Stage 1 Winter bud

D Mars E-L Stage 1 Winter bud