Charlie Austin’s goal in the 58th minute proved to be the difference between the two teams in London.
Evans was far from impressed with Leeds’ performance and said on BBC Radio Leeds: “It was a poor performance. We started the second half properly and the goal came against the run of play. We should have scored in the last 15 minutes but it was not a good performance.
“You can't let Charlie Austin run away and take a free header like he did,” added Evans. “I think we started the second half well.
“They were dominant after the goal but how we didn't score at the end... we didn't score because we haven't got a six yard striker.”
Over the course of the 90 minutes at Loftus Road, hosts QPR had 52% of the possession, took 20 shots of which four were on target, and earned eight corners.
Visitors Leeds had 48% of the possession, took seven shots of which just one was on target, and earned one corner.
The West Yorkshire outfit are now 17th in the Championship table with 19 points from 18 matches, just four points above the relegation zone.