Grape phenology and GDD accumulation

April 18, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 62 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 (4) 7-9 (Budburst; leaf tips visible); First leaf separated from shoot tip to 2 to 3 leaves separated, shoots 2 – 4 cm long

G Norton E-L Stage 4 Budburst; leaf tips visible

G Cabernet Sauvignon E-L Stage 2 - 3 Bud scales opening tp Wooly bud +- green showing — G Cabernet Sauvignon E-L Stage 2 – 3 Bud scales opening tp Wooly bud +- green showing

MVEC Delaware E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip

MVEC Valvin Muscat E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip

MVEC Sunbelt E-L Stage 7-9 First leaf separated from shoot tip to 2 to 3 leaves separated, shoots 2 – 4 cm long

MVEC Chambourcin E-L Stage 4 – (7) Budburst; leaf tips visible to (First leaf separated from shoot tip)

W Catawba E-L Stage Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip

NWV Arandel E-L Stage 9 2 to 3 leaves separated, shoots 2 – 4 cm long

NWV Aromella E-L Stage 7-9 First leaf separated from shoot tip to 2 to 3 leaves separated, shoots 2 – 4 cm long

R Seyval Blanc E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip

R Catawba E-L Stage (4) 7-9 (4) 7-9 (Budburst; leaf tips visible); First leaf separated from shoot tip to 2 to 3 leaves separated, shoots 2 – 4 cm long

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

F Chardonel E-L Stage 7 – (9) First leaf separated from shoot tip to (2 to 3 leaves separated, shoots 2 – 4 cm long)

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

F Cayuga White E-L Stage 7 First leaf separated from shoot tip

D Concord E-L Stage 7-9 First leaf separated from shoot tip to 2 to 3 leaves separated, shoots 2 – 4 cm long

D Vivant E-L Stage 4-(7) Budburst; leaf tips visible to (First leaf separated from shoot tip)

D Vidal Blanc E-L Stage 3 Wooly bud +- green showing

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