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QUESTION > How do you dispel a persistent enchantment cast on a city : where is the dispel command located ?

I cast the Harvest spell on my capital to boost food production for a few turns, but I do not need it anymore and I do not wish to continue paying the enchantment maintenance cost (-5 mana per turn).

Have you tried to: click on the city. Open up city screen. Then go to the city overview dialog at the bottom left. There should be an icon of any spell effects currently affecting the city. Click on it to bring up the cancel dialog.
 
I found the icon, where you said it was. Thank you.

I had missed it because on my high-rez screen, it was a tiny icon which was camouflaged within the rich and colourful landscape of my capital.