Grape phenology and GDD accumulation

August 1, 2016 by Marilyn Odneal

GDD base 50 accumulation count beginning April 1 = 2162 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

Xiangqing (Mina) Tang, Suo (Phoebe) Dong, Zhong (Edward) Zhang, and Hongrui (Terry) Wang recorded phenology today as they did last week.

N Norton E-L Stage 33 Berries still hard and green.

G Norton E-L Stage 33 - 35 Berries still hard and green to Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — G Norton E-L Stage 33 – 35 Berries still hard and green to Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

G Cabernet Sauvignon E-L Stage 33-34 Berries still hard and green to to Berries begin to soften, sugar starts increasing.

MVEC Delaware E-L Stage 34 - 36 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge to Berries with intermediate sugar levels. — MVEC Delaware E-L Stage 34 – 36 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge to Berries with intermediate sugar levels.

MVEC Valvin Muscat E-L Stage 32 - 33 Beginning of bunch closure, berries touching (if bunches are tight) to Berries still hard and green. — MVEC Valvin Muscat E-L Stage 32 – 33 Beginning of bunch closure, berries touching (if bunches are tight) to Berries still hard and green.

MVEC Sunbelt E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — MVEC Sunbelt E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

MVEC Chambourcin E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — MVEC Chambourcin E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

W Catawba E-L Stage 33 Berries still hard and green.

NWV Arandel E-L Stage 37 - 38 Berries not quite ripe to Berries harvest ripe. — NWV Arandel E-L Stage 37 – 38 Berries not quite ripe to Berries harvest ripe.

NWV Aromella E-L Stage 36 - 37 Berries with intermediate sugar levels to Berries not quite ripe. — NWV Aromella E-L Stage 36 – 37 Berries with intermediate sugar levels to Berries not quite ripe.

R Seyval Blanc E-L Stage 35 - 36 Berries with intermediate sugar levels to Berries not quite ripe. — R Seyval Blanc E-L Stage 35 – 36 Berries with intermediate sugar levels to Berries not quite ripe.

R Catawba E-L Stage 33 - 34 Berries still hard and green to Berries begin to soften, sugar starts increasing. — R Catawba E-L Stage 33 – 34 Berries still hard and green to Berries begin to soften, sugar starts increasing.

F Vignoles E-L Stage 34 - 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge. — F Vignoles E-L Stage 34 – 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge.

F Chardonel E-L Stage 35 - 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels. — F Chardonel E-L Stage 35 – 36 Berries begin to colour and enlarge to Berries with intermediate sugar levels.

F Traminette E-L Stage 34 - 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge. — F Traminette E-L Stage 34 – 35 Berries begin to soften, sugar starts increasing to Berries begin to colour and enlarge.

F Cayuga White E-L Stage 35 - 36 Berries with intermediate sugar levels to Berries not quite ripe. — F Cayuga White E-L Stage 35 – 36 Berries with intermediate sugar levels to Berries not quite ripe.

D Concord E-L Stage 33 - 34 Berries still hard and green to Berries begin to soften, Sugar starts increasing. — D Concord E-L Stage 33 – 34 Berries still hard and green to Berries begin to soften, Sugar starts increasing.

D Vivant E-L Stage 35 Berries begin to colour and enlarge.

D Vidal Blanc E-L Stage 33 - 34 Berries still hard and green to Berries begin to soften, sugar starts increasing. — D Vidal Blanc E-L Stage 33 – 34 Berries still hard and green to Berries begin to soften, sugar starts increasing.

D Mars E-L Stage 37 - 38 Berries not quite ripe to Berries harvest ripe. — D Mars E-L Stage 37 – 38 Berries not quite ripe to Berries harvest ripe.