Grape phenology and GDD accumulation

May 23, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 421 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 to 12 leaves separated; inflorescence well developed; single flowers separated.

G Norton E-L Stage 16 10 leaves separated

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

MVEC Delaware 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 colour fading from green — MVEC Delaware 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 colour fading from green

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 21 30% cap fall

MVEC Chambourcin E-L Stage 16 10 leaves separated

W Catawba E-L Stage 17 12 leaves separated; inflorescence well developed, single flowers separated.

NWV Arandel E-L Stage 18 14 leaves separated; flower caps still in place, but cap colour fading from green.

NWV Aromella E-L Stage 18 14 leaves separated; flower caps still in place, but cap colour fading from green.

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

R Catawba E-L Stage 18 - 19 14 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place but cap colour fading from green — R Catawba E-L Stage 18 – 19 14 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place but cap colour fading from green

F Vignoles E-L Stage 15 - 16 8 leaves separated; shoots elongating rapidly; single flowers in compact groups to 10 leaves separated — F Vignoles E-L Stage 15 – 16 8 leaves separated; shoots elongating rapidly; single flowers in compact groups to 10 leaves separated

F Chardonel E-L Stage 18 - 19 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) — F Chardonel E-L Stage 18 – 19 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)

F Traminette E-L Stage16 10 leaves separated

F Cayuga White 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). — F Cayuga White 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).

D Concord E-L Stage Stage23 17 – 20 leaves separated; 50% caps off (=flowering).

D Vivant E-L Stage Stage17 - 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place, but cap colour fading from green — D Vivant E-L Stage Stage17 – 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place, but cap colour fading from green

D Vidal Blanc E-L Stage 16 10 leaves separated

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