Trewick makes two changes, but looks like keeping with the 3-5-2 formation. Ryan Green returns to replace Richard Rose while Sam Gwynne replaces Edrissa Sonko in the middle for the Bulls.
Mathieu Manset returns from suspension to take up a place on the bench.
The hosts swept into the lead in the fourth minute when Ryan Valentine scored from the penalty spot after Kevin McIntyre brought down Keith Lowe.
Gavin McCallum extended the lead with a low shot to the far corner of the net before Waide Fairhurst scored from close in after a goal-mouth scramble.
Hereford had the better of the second 45, but needed a last-minute Kenny Lunt clearance to secure victory.