Please consider agency authority (implied and apparent) in the following hypo:

Parsons, who lives in New York, bought a ranch in Montana. She hired Able to manage it, instructing Able not to sell any cattle for six months. Unknown to Parsons, ranch managers in the area where the ranch is located have the customary power to sell cattle. One month later Able sold some cattle that were not in his possession to Treece, who knew that Able was the manager of the ranch but did not know of the local custom.

Can Parsons disaffirm the sale?

Would it change your analysis if Treece knew that Able was Parsons' agent but did not know that Able was the manager?