Grapes or rootstocks

Grapes

One item of agricultural biodiversity interest from my visit to Bologna last weekend, this rather charming 1926 poster.1 It offers, as you can see, American vines. And here’s my question: varieties, or Phylloxera-resistant rootstocks?

Footnotes:
  1. Apologies for the quality. I took it after a rather wonderful lunch at Il Tinello, and alcoholic beverages had been involved. []

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