Grape phenology and GDD accumulation

May 27, 2019 by Marilyn Odneal

GDD base 50 accumulation for today = 569 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

1. N Norton E-L Stage 17 - 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place, but cap colour fading from green. — 1. N Norton E-L Stage 17 – 18 12 leaves separated; inflorescence well developed, single flowers separated to 14 leaves separated; flower caps still in place, but cap colour fading from green.

2. G Norton E-L Stage 19 - 20 About 16 leaves separated; beginning of flowering (first flower caps loosening to 10% caps off. — 2. G Norton E-L Stage 19 – 20 About 16 leaves separated; beginning of flowering (first flower caps loosening to 10% caps off.

3. G Cabernet Sauvignon E-L Stage 19 - 20 About 16 leaves separated; beginning of flowering (first flower caps loosening to 10% caps off. — 3. G Cabernet Sauvignon E-L Stage 19 – 20 About 16 leaves separated; beginning of flowering (first flower caps loosening to 10% caps off.

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

5. MVEC Chambourcin E-L Stage 26 Cap fall complete

6. W Catawba E-L Stage 19 - 25 About 16 leaves separated; beginning of flowering (first flower caps loosening to 80% caps off. — 6. W Catawba E-L Stage 19 – 25 About 16 leaves separated; beginning of flowering (first flower caps loosening to 80% caps off.

7. NWV Chardonel E-L Stage 23 - 25 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off. — 7. NWV Chardonel E-L Stage 23 – 25 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off.

8. NWV Chambourcin E-L Stage 23 - 27 17 – 20 leaves separated; 50% caps off (=flowering) to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem. — 8. NWV Chambourcin E-L Stage 23 – 27 17 – 20 leaves separated; 50% caps off (=flowering) to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

9. R Seyval Blanc E-L Stage 25 - 27 80% caps off to Setting; young berries enlarging (>2mm diam.), bunch at right angles to stem. — 9. R Seyval Blanc E-L Stage 25 – 27 80% caps off to Setting; young berries enlarging (>2mm diam.), bunch at right angles to stem.

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

11. R Norton E-L Stage 18 - 19 14 leaves separated; flower caps still in place but cap colour fading from green to About 16 leaves separated; beginning of flowering (first flower caps loosening. — 11. R Norton E-L Stage 18 – 19 14 leaves separated; flower caps still in place but cap colour fading from green to About 16 leaves separated; beginning of flowering (first flower caps loosening.

12. F Norton E-L Stage 18 14 leaves separated; flower caps still in place but cap colour fading from green.

13. F Vignoles E-L Stage 23 - 26 17 – 20 leaves separated; 50% caps off (=flowering) to Cap fall complete. — 13. F Vignoles E-L Stage 23 – 26 17 – 20 leaves separated; 50% caps off (=flowering) to Cap fall complete.

14. F Chardonel E-L Stage 26 Cap fall complete.

15. F Vidal Blanc E-L Stage 20 - 23 10% caps off to 17 – 20 leaves separated; 50% caps off (=flowering). — 15. F Vidal Blanc E-L Stage 20 – 23 10% caps off to 17 – 20 leaves separated; 50% caps off (=flowering).

16. F Traminette E-L Stage 23 - 25 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off. — 16. F Traminette E-L Stage 23 – 25 17 – 20 leaves separated; 50% caps off (=flowering) to 80% caps off.

17. F Cayuga White E-L Stage 26 - 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem. — 17. F Cayuga White E-L Stage 26 – 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

18. D Concord E-L Stage 26 - 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem. — 18. D Concord E-L Stage 26 – 27 Cap fall complete to Setting; young berries enlarging (>2 mm diam.), bunch at right angles to stem.

19. D Vivant E-L Stage 26 Cap fall complete.

20. D Mars E-L Stage 25 - 27 25 - 27 80% caps off to Setting; young berries enlarging (>2mm diam.), bunch at right angles to stem. — 20. D Mars E-L Stage 25 – 27 25 – 27 80% caps off to Setting; young berries enlarging (>2mm diam.), bunch at right angles to stem.