Grape phenology and GDD accumulation

May 22, 2017 by Marilyn Odneal

GDD base 50 accumulation since April 1 = 529. 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 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. — N Norton 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.

G Norton 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. — G Norton 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.

G Cabernet Sauvignon E-L Stage 17 12 leaves separated; inflorescence well developed, single flowers separated.

MVEC Delaware E-L Stage 23 17 – 20 leaves separated; 50% cap fall (= flowering).

MVEC Valvin Muscat 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. — MVEC Valvin Muscat 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.

MVEC Sunbelt E-L Stage 27 - 29 Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem to Berries peppercorn size (4 mm diam.); bunches tending downwards. — MVEC Sunbelt E-L Stage 27 – 29 Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem to Berries peppercorn size (4 mm diam.); bunches tending downwards.

MVEC Chambourcin E-L Stage 23 17 – 20 leaves separated; 50% cap fall (= flowering).

W Catawba E-L Stage 19 About 16 leaves separated beginning of flowering (first flower caps loosening).

NWV Arandel E-L Stage 25 - 26 80% caps off to Cap-fall complete. — NWV Arandel E-L Stage 25 – 26 80% caps off to Cap-fall complete.

NWV Aromella E-L Stage 23 - 25 17 – 20 leaves separated; 50% caps off (= flowering) to 80% caps off. — NWV Aromella E-L Stage 23 – 25 17 – 20 leaves separated; 50% caps off (= flowering) to 80% caps off.

R Seyval Blanc E-L Stage 23 - 25 17 – 20 leaves separated; 50% caps off (= flowering) to 80% caps off. — R Seyval Blanc E-L Stage 23 – 25 17 – 20 leaves separated; 50% caps off (= flowering) to 80% caps off.

R Catawba E-L Stage 26 Cap-fall complete.

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

F Chardonel E-L Stage 21 30% caps off.

F Traminette E-L Stage 19 About 16 leaves separated; beginning of flowering (first flower caps loosening).

F Cayuga White E-L Stage 25 80% caps off.

D Concord E-L Stage 27 Setting; young berries enlarging (>2 mm diam), bunch at right angles to stem

D Vivant E-L Stage 25 80% caps off.

D Vidal Blanc E-L Stage 18 14 leaves separated; flower caps still in place, but cap fading from green.

D Mars E-L Stage 23 17 – 20 leaves separated; 50% cap fall (= flowering).