Grape phenology and GDD accumulation

April 19, 2021 by Marilyn Odneal

GDD base 50 = 84. 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

A critical freeze is predicted for Tuesday night, so we will see how things look afterward!!

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

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

G NC-6 E-L Stage 3-4 Wooly bud +/- green to Budburst; leaf tips visible.

MVEC Sunbelt E-L Stage 4-9 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 First leaf separated from shoot tip.

W Catawba E-L Stage 3-4 Wooly bud +/- green to Budburst; leaf tips visible.

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

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 Budburst; leaf tips visible to First leaf separated from shoot tip.

R. Norton E-L Stage 3-4 Wooly bud +/- green to Budburst; leaf tips visible.

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

F Norton E-L Stage 3-4 Wooly bud +/- green to Budburst; leaf tips visible.

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

F Chambourcin 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 Vidal Blanc E-L Stage 3-4 Wooly bud +/- green to Budburst; leaf tips visible.

F Traminette E-L Stage 4 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 – 3 leaves separated; shoots 2 – 4 cm long.

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