Grape phenology and GDD accumulation

June 12, 2017 by Marilyn Odneal

GDD base 50 accumulation since April 1 = 870. 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 29 Berries pepper-corn size (4 mm diam.), bunches tending downwards.

G Norton 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. — G Norton 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.

G Cabernet Sauvignon 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. — G Cabernet Sauvignon 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 Delaware E-L Stage 31 - 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight). — MVEC Delaware E-L Stage 31 – 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight).

MVEC Valvin Muscat E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

MVEC Sunbelt E-L Stage 32 Beginning of bunch closure, berries touching (if bunches are tight).

MVEC Chambourcin E-L Stage 31 Berries pea-size (7 mm diam.).

W Catawba E-L Stage 31 Berries pea-size (7 mm diam.).

NWV Arandel E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

NWV Aromella E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

R Seyval Blanc E-L Stage 31 - 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight). — R Seyval Blanc E-L Stage 31 – 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight).

R Catawba E-L Stage 31 Berries pea-size (7 mm diam.).

F Vignoles E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

F Chardonel E-L Stage 31 Berries pea-size (7 mm diam.).

F Traminette E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

F Cayuga White E-L Stage 31 - 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight). — F Cayuga White E-L Stage 31 – 32 Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight).

D Concord E-L Stage Berries pea-size (7 mm diam.) to Beginning of bunch closure, berries touching (if bunches are tight).

D Vivant E-L Stage 31 Berries pea-size (7 mm diam.).

D Vidal Blanc E-L Stage 29- 31 Berries pepper-corn size (4 mm diam.); bunches tending downwards to Berries pea-size (7 mm diam.).

D Mars E-L Stage 31 Berries pea-size (7 mm diam.).