Grape phenology and GDD accumulation

May 16, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 377 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 16 10 leaves separated

G Norton E-L Stage 15 8 leaves separated; shoots elongating rapidly; single flowers in compact groups

G Cabernet Sauvignon E-L Stage 14 7 leaves separated

MVEC Delaware E-L Stage 17 12 leaves separated; inflorescence well developed; single flowers separated.

MVEC Valvin Muscat E-L Stage 15 - 16 8 leaves separated; shoot elongating rapidly; single flowers in compact groups to 10 leaves separated. — MVEC Valvin Muscat E-L Stage 15 – 16 8 leaves separated; shoot elongating rapidly; single flowers in compact groups to 10 leaves separated.

MVEC Sunbelt E-L Stage 17-19 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place, but cap colour fading from green to About 16 leaves separated; beginning of flowering (first flower caps loosening).

MVEC Chambourcin E-L Stage 15 - 16 8 leaves separated; shoot elongating rapidly; single flowers in compact groups to 10 leaves separated. — MVEC Chambourcin E-L Stage 15 – 16 8 leaves separated; shoot elongating rapidly; single flowers in compact groups to 10 leaves separated.

W Catawba E-L Stage16 10 leaves separated

NWV Arandel E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

NWV Aromella E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

R Seyval Blanc E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

R Catawba E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

F Vignoles E-L Stage 15 8 leaves separated; shoots elongating rapidly; single flowers in compact groups

F Chardonel E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

F Traminette E-L Stage16 10 leaves separated

F Cayuga White E-L Stage 16 – 17 10 leaves separated to 12 leaves separated; inflorescence well developed, single flowers separated.

D Concord E-L Stage Stage16 10 leaves separated

D Vivant E-L Stage Stage16 10 leaves separated

D Vidal Blanc E-L Stage 15 8 leaves separated; shoots elongating rapidly; single flowers in compact groups

D Mars E-L Stage Stage16 10 leaves separated