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What's happening in the field?

At the Missouri State Fruit Experiment Station

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.
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 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.
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 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.
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.
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.
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 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 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.
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 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 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 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 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 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 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 Traminette E-L Stage 4 Budburst; leaf tips visible.
F Cayuga White E-L Stage 7 First leaf separated from shoot tip.
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 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.
D Mars E-L Stage 7 First leaf separated from shoot tip.

Filed Under: Grapes, Phenology

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