Grape phenology and GDD accumulation

June 20, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 1010 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 32 Beginning of bunch closure; berries touching (if bunches are tight).

G Norton E-L Stage 29 - 31 Berries pepper-corn size (4 mm diam); bunches tending downward to Berries pea-size (> 7mm diam.). — G Norton E-L Stage 29 – 31 Berries pepper-corn size (4 mm diam); bunches tending downward to Berries pea-size (> 7mm diam.).

G Cabernet Sauvignon E-L Stage 29 – 31 Berries pepper-corn size (4 mm diam); bunches tending downward to Berries pea-size (> 7mm diam.).

MVEC Delaware E-L Stage 33 Berries still hard and green.

MVEC Valvin Muscat E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

MVEC Sunbelt E-L Stage 33 Berries still hard and green.

MVEC Chambourcin E-L Stage 31 Berries pea-size (> 7mm diam.).

W Catawba E-L Stage 33 Berries still hard and green.

NWV Arandel E-L Stage 31 Berries pea-size (> 7mm diam.).

NWV Aromella E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

R Seyval Blanc E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

R Catawba E-L Stage 33 Berries still hard and green.

F Vignoles E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

F Chardonel E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

F Traminette E-L Stage 31 Berries pea-size (> 7mm diam.).

F Cayuga White E-L Stage 32 - 33 Beginning of bunch closure; berries touching (if bunches are tight) to Berries still hard and green. — F Cayuga White E-L Stage 32 – 33 Beginning of bunch closure; berries touching (if bunches are tight) to Berries still hard and green.

D Concord E-L Stage 32 - 33 Beginning of bunch closure; berries touching (if bunches are tight) to Berries still hard and green. — D Concord E-L Stage 32 – 33 Beginning of bunch closure; berries touching (if bunches are tight) to Berries still hard and green.

D Vivant E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).

D Vidal Blanc E-L Stage 31 Berries pea-size (> 7mm diam.).

D Mars E-L Stage 32 Beginning of bunch closure; berries touching (if bunches are tight).