Grape phenology and GDD accumulation

April 11, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 32 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 3-4 Wooly bud +- green showing to Budburst; leaf tips visible

G Norton E-L Stage 3 Wooly bud +- green showing

G Cabernet Sauvignon E-L Stage 2 Bud scales opening

MVEC Delaware E-L Stage 3 Wooly bud +- green showing

MVEC Valvin Muscat E-L Stage 3 Wooly bud +- green showing

MVEC Sunbelt E-L Stage 4 Budburst; leaf tips visible

MVEC Chambourcin E-L Stage 3 Wooly bud +- green showing

W Catawba E-L Stage 2-3 Wooly bud +- green showing

NWV Arandel E-L Stage 4 Budburst; leaf tips visible

NWV Aromella E-L Stage 4 Budburst; leaf tips visible

R Seyval Blanc E-L Stage 3 Wooly bud +- green showing

R Catawba E-L Stage 3 – 4 – (7) Wooly bud +- green showing to Budburst; leaf tips visible; to first leaf separated from shoot tip.

F Vignoles E-L Stage 2-3 Bud scales opening to Wooly bud +- green showing

F Chardonel E-L Stage 4 - 7 Budburst; leaf tips visible; to first leaf separated from shoot tip. — F Chardonel E-L Stage 4 – 7 Budburst; leaf tips visible; to first leaf separated from shoot tip.

F Traminette E-L Stage 2 - 3 Bud scales opening to Wooly bud +- green showing — F Traminette E-L Stage 2 – 3 Bud scales opening to Wooly bud +- green showing

F Cayuga White E-L Stage 3-4 Wooly bud +- green showing to Budburst; leaf tips visible

D Concord E-L Stage 3-4 Wooly bud +- green showing to Budburst; leaf tips visible

D Vivant E-L Stage 3 Wooly bud +- green showing

D Vidal Blanc E-L Stage 2 Bud scales opening

D Mars E-L Stage 3 Wooly bud +- green showing