Mike McGrath's deflected cross opened the scoring, before Garyn Preen added a second before half time.
In the second half, an nasty injury for Garyn Preen saw him unconscious for a period. After regaining consciousness he was taken to Southampton hospital.
Callum Howe then netted for the hosts, but it wasn't enough to stop Hereford progressing.
We will update fans on Garyn Preen as soon as we know more.
Full report to follow.