LaRoche struck out looking on a questionable call in the fifth and appeared to have words with home-plate umpire Bob Davidson immediately after being punched out and again as he left the field at the end of the Brewers' fifth.
Davidson tossed LaRoche, which caused Russell to storm out of the dugout and get into a shouting match with the umpire. Russell and Davidson were separated by second-base umpire Mike Reilly during the back-and-forth confrontation. It marked Russell's first ejection as Pittsburgh's manager.
Doug Mientkiewicz replaced LaRoche at first base.
Nick Zaccardi is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.