Grape phenology and GDD accumulation

April 30, 2018 by Marilyn Odneal

GDD base 50 accumulation for April 23 = 97 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 Budburst, leaf tips visible.

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

G Cabernet Sauvignon E-L Stage 4 Budburst, leaf tips visible.

MVEC Delaware E-L Stage 4 - 7 Budburst, leaf tips visible – First leaf separated from shoot tip. — MVEC Delaware E-L Stage 4 – 7 Budburst, leaf tips visible – First leaf separated from shoot tip.

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

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

W Catawba E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible. — W Catawba E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible.

NWV Chardonel E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible. — NWV Chardonel E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible.

R Seyval Blanc E-L Stage 4 Budburst, leaf tips visible.

R Vidal Blanc E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible. — R Vidal Blanc E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible.

R Catawba E-L Stage 3 - 7 Wooly bud +- green showing to Budburst, leaf tips visible – First leaf separated from shoot tip. — R Catawba E-L Stage 3 – 7 Wooly bud +- green showing to Budburst, leaf tips visible – First leaf separated from shoot tip.

F Vignoles E-L Stage 3 - 7 Wooly bud +- green showing to Budburst, leaf tips visible. — F Vignoles E-L Stage 3 – 7 Wooly bud +- green showing to Budburst, leaf tips visible.

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

F Traminette E-L Stage 3 – 7 Wooly bud +- green showing to Budburst, leaf tips visible to First leaf separated from shoot tip. — F Traminette E-L Stage 3 – 7 Wooly bud +- green showing to Budburst, leaf tips visible to
First leaf separated from shoot tip.

F Cayuga White E-L Stage 4 - 9 Budburst, leaf tips visible to First lef separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long. — F Cayuga White E-L Stage 4 – 9 Budburst, leaf tips visible to First lef separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long.

D Concord E-L Stage 4 - 9 Budburst, leaf tips visible to First lef separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long. — D Concord E-L Stage 4 – 9 Budburst, leaf tips visible to First lef separated from shoot tip to 2 to 3 leaves separated; shoots 2 – 4 cm long.

D Vivant E-L Stage 3 - 4 Wooly bud +- green showing to Budburst, leaf tips visible. — D Vivant E-L Stage 3 – 4 Wooly bud +- green showing to Budburst, leaf tips visible.

D Mars E-L Stage 4 Budburst, leaf tips visible.

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