Dave Wood comments on UG99 myths, and then adds, perhaps provocatively, that
The current fashion for the on-farm conservation of crop diversity ignores the inevitable conservation of diverse plant diseases, some of which, like Ug99 of wheat, can cross continents on the wind and threaten crop production globally.
“Ignores” may be a bit strong here. Is not (one of the) explicit point(s) of on-farm conservation to allow continued co-evolution of crop and pest? On-farmers, over to you!