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?

Nibbles: Plant Guardians, Peruvian Solanum, Sunflower genomics, California drought, Brazil drought, Sri Lankan tea, Minnesota wine, Seed of Hope, Sugarcane engineering, King Cotton, Rubber boom

Brainfood: Weird coconut, Rainforest management, Pollinators and grazing, Pre-Mendel, Italian grapes, Indian fibre species, Cereal relatives, Brazil nut silviculture

Brainfood: Value of Chiloé, Zimbabwe sorghum, Rosa karyotypes, PSM diversity, Pear diversity, Medic clines, Wild rices, Barley adaptation, Coffee agroforesty