Grape phenology and GDD accumulation

August 12, 2019 by Marilyn Odneal

GDD base 50 accumulation for today = 2330 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 35 Berries begin to colour and enlarge.

2. G Norton E-L Stage 35 Berries begin to colour and enlarge.

3. G Cabernet Sauvignon E-L Stage 35 Berries begin to colour and enlarge.

4. MVEC Sunbelt E-L Stage 37 Berries not quite ripe.

5. MVEC Chambourcin E-L Stage 36 Berries with intermediate sugar levels.

6. W Catawba E-L Stage 33 - 34 Berries still hard and green to Berries begin to soften; Sugar starts increasing. — 6. W Catawba E-L Stage 33 – 34 Berries still hard and green to Berries begin to soften; Sugar starts increasing.

7. NWV Chardonel E-L Stage 37 Berries not quite ripe.

8. NWV Chambourcin E-L Stage 36 Berries with intermediate sugar levels.

9. R Seyval Blanc E-L Stage 37 Berries not quite ripe.

10. R Catawba E-L Stage 34 - 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge. — 10. R Catawba E-L Stage 34 – 35 Berries begin to soften; Sugar starts increasing to Berries begin to colour and enlarge.

11. R Norton E-L Stage 35 Berries begin to colour and enlarge.

12. F Norton E-L Stage 35 Berries begin to colour and enlarge.

13. F Vignoles E-L Stage 37 Berries not quite ripe.

14. F Chardonel E-L 37 Berries not quite ripe.

15. F Vidal Blanc E-L Stage 36 Berries with intermediate sugar levels.

16. F Traminette E-L Stage 37 Berries not quite ripe.

17. F Cayuga White E-L Stage 38 Berries harvest-ripe.

18. D Concord E-L Stage 36 Berries with intermediate sugar levels.

19. D Vivant E-L Stage 38 Berries harvest-ripe.

20. D Mars E-L Stage 40 After harvest, but cane maturation not complete (bird damage). — 20. D Mars E-L Stage 40 After harvest, but cane maturation not complete

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