Grape phenology and GDD accumulation

May 29, 2018 by Marilyn Odneal

N Norton E-L Stage 21 - 23 10 30% caps off and 17 – 20 leaves separated; 50% caps off (=flowering). — N Norton E-L Stage 21 – 23 10 30% caps off and 17 – 20 leaves separated; 50% caps off (=flowering).

G Norton E-L Stage 21 - 23 10 30% caps off and 17 – 20 leaves separated; 50% caps off (=flowering). — G Norton E-L Stage 21 – 23 10 30% caps off and 17 – 20 leaves separated; 50% caps off (=flowering).

G Cabernet Sauvignon E-L Stage 23 17 – 20 leaves separated; 50% caps off (=flowering).

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

MVEC Sunbelt E-L Stage 29 Berries peppercorn size (4 mm diam.); bunches tending downward.

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

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

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

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

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

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

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

F Chardonel E-L Stage 23 17 – 20 leaves separated; 50% caps off (=flowering).

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

F Cayuga White E-L Stage 29 Berries peppercorn size (4 mm diam.); bunches tending downward.

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

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

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

GDD base 50 accumulation for May 29 = *** (agebb was down and GDD was not available). 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