World crop capitals?

The post a couple of days back about horseradish got me thinking about the whole “Capital of the World” thing. And of course it turns out Wikipedia has a long list of cities that call themselves the world capital of something or other. Here are the ones for crops (and one domesticated animal):

You’ll notice something of a disagreement over horseradish! Anyway, unsurprisingly perhaps, most of these places are in the US, and indeed California. So I was thinking: what would be the real Avocado Capital of the World, for example? I would vote for Antigua in Guatemala, where a couple of important varieties originated. The California Avocado Society (I think) put a plaque in the central plaza some years back commemorating the contribution of the area to the California avocado industry. The famous plant explorer Wilson Popenoe had a house there. Here’s a history of the avocado. And here’s an interesting account of avocado collecting in Guatemala. Any other ideas? What would naming a city a world capital for a crop do for the conservation of that crop?