Both sides went close before Knoyle settled the contest just shy of the hour mark with his first goal of the season and second in 77 games.
Right-back Knoyle, who played in a back three in Tom Anderson's absence due to illness, leathered the ball home from the edge of the box following Ben Close's cutback.
The win halted Rovers' two-game losing streak in League Two and moved them up to tenth and within two points of the play-offs.
9. Adam Clayton - 8
Played two defence-splitting passes which should have broken the deadlock and did the ugly stuff well in a good all-round display. Photo: Howard Roe/ahpix.com
10. Ben Close - 7
Showcased his ability on the ball, even if he was sometimes second best against Nathan Moriah-Welsh. Should have scored when the ball fell to him in the box, but his effort was blocked. Photo: Liam Ford/AHPIX LTD
11. Harrison Biggins - 7
Went close on several occasions and looked far more threatening than in recent weeks. Photo: HOWARD ROE, Howard Roe/AHPIX LTD
12. Max Woltman - 6
Looked far more likely to make something happen than he did last week. Almost assisted Biggins for what would have been the opening goal. Photo: Gareth Williams/AHPIX LTD