Grape phenology and GDD accumulation

May 11, 2015 by Marilyn Odneal

GDD base 50 accumulated since April 1 = 372
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 14 – 15 7-8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

MVEC Delaware E-L Stage 15-16 8-10 leaves separated; shoots elongating rapidly, single flowers in compact groups.

MVEC Valvin Muscat E-L Stage 15 8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

MVEC Sunbelt E-L Stage 16 10 leaves separated

MVEC Chambourcin E-L Stage 13-15 6 – 8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

W Catawba E-L Stage 15 8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

R Vidal Blanc E-L Stage 11-12 4-5 leaves separated; shoots about 4 inches long

R Seyval Blanc E-L Stage 13-14 6-7 leaves separated

R Catawba E-L Stage 14-15 7-8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

F Vignoles E-L Stage 11-13 4-6 leaves separated

Chardonel E-L Stage 13-15 6 – 8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

F Traminette E-L Stage 13-14 6-7 leaves separated

F Cayuga White E-L Stage 13-14 6-7 leaves separated

D Concord E-L Stage 13-15 6 – 8 leaves separated; shoots elongating rapidly, single flowers in compact groups.

D Vivant E-L Stage 12-13 5-6 leaves separated; shoots 4 inches long +; inflorescence clear

D Mars E-L Stage 13-14 6-7 leaves separated