Pub Quiz thread

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Cheers Dave. Remaining on the subject of banning, but moving south of the border. Which commonly grown plant (in both the UK and Germany) - grown often by self sufficiency freaks like myself (very edible) was banned in the USA for nearly a century with the ban only being lifted for some states in 2003 ? Also why was it banned ?
 
Blackcurrents and something to do with a fungus that could spread to trees?
That's the one Frenchie. There are many examples of fungus forms which have 2 host plants - mostly between fruit trees and bushes, and evergreens such as pines, ceder etc. where the fungus lives over the winter. Fruit orchards are never situated close to these - we had problems between our pear trees and the juniper bushes of our neighbour a few years back. In order to protect the white pines in the USA (and the timber industry) the Americans banned the cultivation of blackcurrants for nearly a century. Over to you.