Grape phenology and GDD Accumulation

May 31, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 570 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 18 - 22 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) to 10% caps off to 30% caps off. — N Norton E-L Stage 18 – 22 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) to 10% caps off to 30% caps off.

G Norton E-L Stage 17 - 20 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) to 10% caps off. — G Norton E-L Stage 17 – 20 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) to 10% caps off.

G Cabernet Sauvignon E-L Stage 16 - 18 10 leaves separated to 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 16 – 18 10 leaves separated to 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 23 - 26 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off to cap fall complete. — MVEC Delaware E-L Stage 23 – 26 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off to cap fall complete.

MVEC Valvin Muscat E-L Stage 17 - 25 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) to 10% caps off to 30% caps off to 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off. — MVEC Valvin Muscat E-L Stage 17 – 25 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) to 10% caps off to 30% caps off to 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off.

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

MVEC Chambourcin E-L Stage 23 - 26 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off to cap fall complete. — MVEC Chambourcin E-L Stage 23 – 26 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off to cap fall complete.

W Catawba E-L Stage 26 - 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem. — W Catawba E-L Stage 26 – 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

NWV Arandel E-L Stage 25 - 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem. — NWV Arandel E-L Stage 25 – 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem.

NWV Aromella E-L Stage 26 - 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem. — NWV Aromella E-L Stage 26 – 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

R Seyval Blanc E-L Stage 25 - 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem. — R Seyval Blanc E-L Stage 25 – 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem.

R Catawba E-L Stage 26 - 29 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem to Berries peppercorn size (4 mm diam.); bunches tending downward. — R Catawba E-L Stage 26 – 29 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem to Berries peppercorn size (4 mm diam.); bunches tending downward.

F Vignoles E-L Stage 18 - 23 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering) — F Vignoles E-L Stage 18 – 23 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering)

F Chardonel E-L Stage 25 - 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem. — F Chardonel E-L Stage 25 – 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem.

F Traminette E-L Stage18 - 23 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering) — F Traminette E-L Stage18 – 23 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering)

F Cayuga White E-L Stage 25 - 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem. — F Cayuga White E-L Stage 25 – 27 80% caps off to Cap fall complete to Setting; young berries enlarging (>2 m diam.), bunch at right angles to stem.

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

D Vivant E-L Stage Stage26 – 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

D Vidal Blanc E-L Stage 18 - 25 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering) to 89% caps off. — D Vidal Blanc E-L Stage 18 – 25 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) to 10% caps off to 30% caps off to 17 – 20 leaves separated; 50% caps off (=flowering) to 89% caps off.

D Mars E-L Stage 23 - 26 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off to cap fall complete. — D Mars E-L Stage 23 – 26 17 to 20 leaves separated; 50% caps off (= flowering) to 80% caps off to cap fall complete.