Grape phenology and GDD accumulation

April 17, 2017 by Marilyn Odneal

GDD base 50 accumulation since April 1 = 149. 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 9 - 11 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated. — N Norton E-L Stage 9 – 11 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated.

G Norton E-L Stage 9 - 11 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated. — G Norton E-L Stage 9 – 11 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated.

G Cabernet Sauvignon E-L Stage 9 2 to 3 leaves separated; shoots 2 – 4 cm long

MVEC Delaware E-L Stage 12 5 leaves separated; shoots about 10 cm long; inflorescence clear.

MVEC Valvin Muscat E-L Stage 11 4 leaves separated.

MVEC Sunbelt E-L Stage 12 5 leaves separated; shoots about 10 cm long; inflorescence clear

MVEC Chambourcin E-L Stage 11 4 leaves separated.

W Catawba E-L Stage 9 - 12 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear. — W Catawba E-L Stage 9 – 12 2 to 3 leaves separated; shoots 2 – 4 cm long to 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear.

NWV Arandel E-L Stage 12 – 14 5 leaves separated; shoots about 10 cm long; inflorescence clear to 6 leaves separated to 6 leaves separated.

NWV Aromella E-L Stage 12 5 leaves separated; shoots about 10 cm long; inflorescence clear.

R Seyval Blanc E-L Stage 12 5 leaves separated; shoots about 10 cm long; inflorescence clear.

R Catawba E-L Stage 11 - 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear. — R Catawba E-L Stage 11 – 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear.

F Vignoles E-L Stage 7 - 11 First leaf separated from shoot tip to 2 to 3 leaves separated; shoots 2-4 cm long to 4 leaves separated. — F Vignoles E-L Stage 7 – 11 First leaf separated from shoot tip to 2 to 3 leaves separated; shoots 2-4 cm long to 4 leaves separated.

F Chardonel E-L Stage 12 – 14 5 leaves separated; shoots about 10 cm long; inflorescence clear to 6 leaves separated to 6 leaves separated.

F Traminette E-L Stage 11 4 leaves separated.

F Cayuga White E-L Stage 12 – 14 5 leaves separated; shoots about 10 cm long; inflorescence clear to 6 leaves separated to 6 leaves separated.

D Concord E-L Stage 11 - 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear. — D Concord E-L Stage 11 – 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear.

D Vivant E-L Stage 11 - 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear. — D Vivant E-L Stage 11 – 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear.

D Vidal Blanc E-L Stage 11 4 leaves separated.

D Mars E-L Stage 11 - 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear. — D Mars E-L Stage 11 – 12 4 leaves separated to 5 leaves separated; shoots about 10 cm long; inflorescence clear.