The Frenchman wasted a couple of glorious opportunities, the best of which was ballooned over the crossbar when he would have surely scored had he hit the target at the back post with the score at 1-1.
"United have paid for their missed chances," Scholes told BT Sport after the 3-1 result.
"Martial's chances were the ones, anything on target is a goal.
"He is struggling for goals at the minute. Martial will know, he doesn't need telling, he should score."