Grape phenology and GDD accumulation

April 10, 2017 by Marilyn Odneal

GDD base 50 accumulation since April 1 = 52. 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 — N Norton E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible

G Norton E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible — G Norton E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible

G Cabernet Sauvignon E-L Stage 3 Wooly bud +- green showing

MVEC Delaware E-L Stage 4 Budburst, leaf tips visible

MVEC Valvin Muscat E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible — MVEC Valvin Muscat E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible

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

MVEC Chambourcin E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible — MVEC Chambourcin E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible

W Catawba E-L Stage 4 Budburst, leaf tips visible

NWV Arandel E-L Stage 7 First leaves separated from shoot tip

NWV Aromella E-L Stage 7 First leaves separated from shoot tip

R Seyval Blanc E-L Stage 7 - 9 First leaves separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long — R Seyval Blanc E-L Stage 7 – 9 First leaves separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long

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

F Vignoles E-L Stage 3 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 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible — F Traminette E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible

F Cayuga White E-L Stage 7 - 9 First leaves separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long — F Cayuga White E-L Stage 7 – 9 First leaves separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long

D Concord E-L Stage 4 - 7 Budburst; leaf tips visible to First leaf separated from shoot tip — D Concord E-L Stage 4 – 7 Budburst; leaf tips visible to First leaf separated from shoot tip

Vivant E-L Stage 4 Budburst, leaf tips visible

D Vidal Blanc E-L Stage 4 Budburst, leaf tips visible

D Mars E-L Stage 4 - 7 Budburst; leaf tips visible to First leaf separated from shoot tip — D Mars E-L Stage 4 – 7 Budburst; leaf tips visible to First leaf separated from shoot tip