Grape phenology and GDD accumulation

May 24, 2021 by Marilyn Odneal

GDD base 50 = 383. 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 14 - 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — N Norton E-L Stage 14 – 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

G Norton E-L Stage 12 - 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — G Norton E-L Stage 12 – 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

G NC-6 E-L Stage 13 - 15 6 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — G NC-6 E-L Stage 13 – 15 6 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

MVEC Sunbelt E-L Stage 12 Five leaves separated; shoots about 10 cm long; inflorescence clear.

MVEC Chambourcin E-L Stage 13 - 14 6 leaves separated to 7 leaves separated. — MVEC Chambourcin E-L Stage 13 – 14 6 leaves separated to 7 leaves separated.

W Catawba E-L Stage 12 - 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated. — W Catawba E-L Stage 12 – 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated.

NWV Chardonel E-L Stage 12 - 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — NWV Chardonel E-L Stage 12 – 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

R Seyval Blanc E-L Stage 12 - 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated. — R Seyval Blanc E-L Stage 12 – 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated.

R Catawba E-L Stage 12 - 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated. — R Catawba E-L Stage 12 – 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated.

R. Norton E-L Stage 14 7 leaves separated.

F Vivant E-L Stage 12 - 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated. — F Vivant E-L Stage 12 – 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated.

F Norton E-L Stage 14 - 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — F Norton E-L Stage 14 – 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

F Vignoles E-L Stage 13 - 15 6 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — F Vignoles E-L Stage 13 – 15 6 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

F Chambourcin E-L Stage 12 - 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — F Chambourcin E-L Stage 12 – 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

F Chardonel E-L Stage 12 - 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — F Chardonel E-L Stage 12 – 15 5 leaves separated; shoots about 10 cm long; inflorescence clear to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

F Vidal Blanc E-L Stage 13 - 15 6 leaves separated to 8 leaves separated, shoots elongating rapidly; single flowers in compact groups. — F Vidal Blanc E-L Stage 13 – 15 6 leaves separated to 8 leaves separated, shoots elongating rapidly; single flowers in compact groups.

F Traminette E-L Stage 14 - 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups. — F Traminette E-L Stage 14 – 15 7 leaves separated to 8 leaves separated, shoot elongating rapidly; single flowers in compact groups.

F Cayuga White E-L Stage 12 - 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated. — F Cayuga White E-L Stage 12 – 14 Five leaves separated; shoots about 10 cm long; inflorescence clear to 7 leaves separated.

D Concord E-L Stage 15 – 19 8 leaves separated, shoot elongating rapidly; single flowers in compact groups to About 16 leaves separated, beginning of flowering (first flower caps loosening)

D Mars E-L Stage 17 - 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place but cap fading from green. — D Mars E-L Stage 17 – 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place but cap fading from green.