Grape phenology and GDD accumulation

April 27, 2015 by Marilyn Odneal

GDD base 50 accumulated since April 1 = 196
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 11-12 4 to 5 leaves separated

MVEC Delaware E-L Stage 12 5 leaves separated, shoots about 4 inches long; inflorescence clear

MVEC Valvin Muscat E-L Stage 11-12 4 to 5 leaves separated

MVEC Sunbelt E-L Stage 13 6 leaves separated

MVEC Chambourcin E-L Stage 4-11 budburst to 4 leaves separated

W Catawba E-L Stage 11 4 leaves separated

R Vidal Blanc E-L Stage 7-9 First leaf separated to 2 to 3 leaves separated; shoots 1 – 2 inches long

R Seyval Blanc E-L Stage 11-12 4 to 5 leaves separated

R Catawba E-L Stage 11-12 4 to 5 leaves separated

F Vignoles E-L Stage 4-9 budburst to 2 to 3 leaves separated

Chardonel E-L Stage 7-11 first leaf to 4 leaves separated

F Traminette E-L Stage 7-11 first leaf to 4 leaves separated

F Cayuga White E-L Stage 9-11 2 to 4 leaves separated

D Concord E-L Stage 12 5 leaves separated; shoots about 4 inches long; inflorescence clear

D Vivant E-L Stage 9-11 2 to 4 leaves separated

D Mars E-L Stage 9-11 2 to 4 leaves separated