Grape phenology and GDD accumulation

May 30, 2017 by Marilyn Odneal

GDD base 50 accumulation since April 1 = 616. 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 23 17 – 20 leaves separated; 50% cap fall (= flowering).

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

G Cabernet Sauvignon E-L Stage 21 - 23 30% caps off to 17 – 20 leaves separated; 50% cap fall (= flowering). — G Cabernet Sauvignon E-L Stage 21 – 23 30% caps off to 17 – 20 leaves separated; 50% cap fall (= flowering).

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

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

MVEC Sunbelt E-L Stage 29 - 31 Berries peppercorn size (4 mm diam.); bunches tending downwards to Berries pea-sized (7 mm diam.). — MVEC Sunbelt E-L Stage 29 – 31 Berries peppercorn size (4 mm diam.); bunches tending downwards to Berries pea-sized (7 mm diam.).

MVEC Chambourcin 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. — MVEC Chambourcin 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.

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

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

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

R Seyval Blanc 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. — R Seyval Blanc 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.

R Catawba 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. — R Catawba 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.

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

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

F Traminette E-L Stage 25 80% caps off.

F Cayuga White E-L Stage 27 Setting; young berries enlarging (>2 mm diam), bunch at right angles to stem.

D Concord E-L Stage 29 Berries peppercorn size (4 mm diam.): bunches tending downwards.

D Vivant 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. — D Vivant 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.

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

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