St. Louis starter Shelby Miller threw only two pitches before being hit on the right elbow by a line drive off the bat of Carl Crawford.
Miller left the game and five relievers tried without success to hold the Dodgers in check. Most of the damage was done against Jake Westbrook (7-7), the third St. Louis pitcher who gave up nine runs on 13 hits in 4 2/3 innings.
Los Angeles scored six times in the second inning with Ethier contributing a run-scoring ground out and Schumaker driving in two with a single. Schumaker also had an RBI base hit in both the sixth and ninth innings while Ethier had a three-run double in the ninth.
The Dodgers won for the sixth time in seven games and have gone 16-3 since July 14.
Ricky Nolasco (8-9) did not give up an earned run in five innings to get the win. He struck out five and allowed seven hits.