APPENDIX A: The following grape diagram is an amended version of the original “Modified E-L system for identifying major and intermediate grapevine growth stages” [Coombe, B. and Dry, P. (eds.). 2004. Viticulture 1 Resources. Winetitles. Adelaide, Australia.].
The original document outlines 39 growth stages. Modifications were made for pest management purposes only.
Pictures provided by E. C. Burkness and T. L. Galvan, University of Minnesota |
Stage: Dormant
Diseases: Anthracnose (control at this stage is imperative) |
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Stage: Wooly Bud
Insects: Grape flea beetle |
Stage: Bud Burst
Insects: Grape flea beetle, Climbing cutworms, Apple twig borer
Diseases: Phomopsis |
Stage: 1st Leaf Separated
Insects: Grape flea beetle
Diseases: Phomopsis |
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Stage: Inflorescence Swelling
Insects: Grape flea beetle
Diseases: Black rot, Powdery mildew, Downy mildew, Phomopsis |
Stage: 14 leaves separated, caps starting to loosen
Insects: Grape flea beetle
Diseases: Black rot, Powdery mildew, Downy mildew, Phomopsis |
Stage: Flowering-50% caps off
Insects: Japanese beetle
Diseases: Botrytis, Black rot, Powdery mildew, Downy mildew, Phomopsis |
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Stage: Fruit Set
Insects: Japanese beetle
Diseases: Botrytis, Black rot, Powdery mildew, Downy mildew, Phomopsis |
Stage: Berries BB Sized
Insects: Japanese beetle
*Diseases: Powdery mildew, Downy mildew |
Stage: Berries Pea-Sized
Insects: Grape berry moth, Japanese Beetle
Diseases: Powdery mildew, Downy mildew |
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Stage: Berries Touching
Insects: Grape berry moth, Japanese beetle
Diseases: Botrytis, Powdery mildew, Downy mildew |
Stage: Veraison
Insects: Grape berry moth
Diseases: Botrytis, Powdery mildew, Downy mildew |
Stage: Harvest
Insects: Grape berry moth, Multicolored Asian lady beetle, Yellowjacket, Bumble flower beetle
Diseases: Botrytis, Powdery mildew, Downy mildew |
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*Berries become resistant to black rot, downy mildew, and powdery mildew 3-4 weeks after bloom; however, the rachis and leaves are still susceptible to infection by powdery mildew and downy mildew.
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