Grape Phenology and GDD accumulation

April 25, 2022 by Jennifer Morganthaler

GDD base 50 = 109. We track GDD at http://agebb.missouri.edu/weather/reports/gddTable.asp and rate the 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 Budburst to First leaf separated from shoot tip

D Mars E-L Stage 4 -7 Budburst to First leaf separated from shoot tip.

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

F Vivant E-L Stage 7-9 First leaf separated from shoot tip to 2 to 3 leaves separated; shoots 2-4 cm long.

F Norton E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip.

F Vignoles E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip.

F Chambourcin E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip.

F Chardonel E-L Stage 9 2-3 leaves separated; shoots 2-4 cm long.

F Vidal Blanc E-L Stage 4-7 Budburst; leaf tips visible to First leaf separated from shoot tip.

F Traminette E-L Stage 4 Budburst; leaf tips visible.

F Cayuga White E-L Stage 4 Budburst; leaf tips visible.

R Norton E-L Stage 4 Budburst.

R Catawba E-L Stage 4-9 Budburst; leaf tips visible 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 separatedf from shoot tip.

W Chardonel E-L Stage 4-9 Budburst; leaf tips visible to 2 to 3 leafs separated; shoots 2-4 cm long.

W Catawba E-L Stage 4-9 Budburst; leaf tips visible to 2 to 3 leaves separated; shoots 2-4 cm long.

Genomics NC-6 E-L Stage 3 Wooly bud +/- green showing.

Genomics Norton E-L Stage 4 Budburst;leaf tips visible.

MVEC Sunbelt E-L Stage 4-7 Budburst; leaf tips visible to 2 to 3 leaves separated; shoots 2-4 cm long.

MVEC Chambourcin E-L Stage 4-7 Budburst; leaf tips visible to 2 to 2 leaves separated; shoots 2-4 cm long.