I'm having the same problem - II just got a new mac and can't figure out how to turn printer color management off...or on for that matter. (Its straight forward in Windows). I read somewhere that LR on a Mac ensures that printer color management is turned off when LR is doing the work but have no way to verify. Any ideas out there?
After receiving absolutely no response or help from Adobe, I asked a question and received comprehensive answer here: canon - How can I turn off printer colour management when using Lightroom? - Photography Stack Exchange
Definitely worth reading the answer in full, but in short, if you choose 'Print' from Lightroom's Print screen then Lightroom manages print (and you don't need to turn off Print Management as it happens automatically). If you choose 'Printer ...', then you need to set your profile etc. in the print dialogue.
In short, rather than take the time to write a printer-specific message, or even an OS-specific message, the Lightroom engineers opted for a generic message that makes no sense when users have a Mac and a Canon Pixma Pro 100. Got to say I'm not surprised given Lightroom's downward spiral of late, but annoying nonetheless.
If you are getting unexpected results I would suggest printing a black and white image without any duotone and make sure you have the right paper profile selected and the paper type selected. If your image has a color cast, I would suggest there is a problem with your printer.