Grape phenology and GDD accumulation

April 8, 2020 by Marilyn Odneal

GDD base 50 = 41 at http://agebb.missouri.edu/weather/reports/gddTable.asp

Phenology stages described according to the Modified E-L System http://door.uwex.edu/files/2010/10/ModifiedEichhornLorennzsystem.pdf

1. N Norton E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

2. G Norton E-L Stage 3 Wooly bud +/- green showing.

3. G Cabernet Sauvignon E-L Stage 3 Wooly bud +/- green showing.

4. MVEC Sunbelt E-L Stage 4 Budburst; leaf tips visible.

5. MVEC Chambourcin E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

6. W Catawba E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

7. NWV Chardonel E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

8. NWV Chambourcin E-L Stage 2-3 Bud scales opening to Wooly bud =/- green showing.

9. R Seyval Blanc E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

10. R Catawba E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

11. R Norton E-L Stage 3 Wooly bud +/- green showing.

12. D Vivant E-L Stage 3 Wooly bud +/- green showing.

13. F Norton E-L Stage 3 Wooly bud +/- green showing.

14. F Vignoles E-L Stage 3 Wooly bud +/- green showing.

15. F Chardonel E-L 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

16. F Vidal Blanc E-L Stage 2-3 Bud scales opening to Wooly bud =/- green showing.

17. F Traminette E-L Stage 2-3 Bud scales opening to Wooly bud =/- green showing.

18. F Cayuga White E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

19. D Concord E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

20. D Mars E-L Stage 3-4 Wooly bud +/- green showing to Budburst; leaf tips visible.

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