Scott Disick -- Ex- Manager Begs Him to Get Help, Dry Up

Scott Disick desperately needs help so he doesn't become the 4th friend to die in a matter of weeks .... so worries his ex-manager/celebrity producer David Weintraub.

Weintraub and Disick parted ways on bad terms, but the manager told our photog Thursday, the only solution is rehab, and STAT.

Weintraub's plea is pretty emotional, playing on Disick's emotions as a parent.