Hereford boss Jamie Pitman warned his players they will be on the wrong end of a hiding against Swindon on Saturday if they do not improve.
Guy Madjo's first goal for Aldershot proved enough to secure a 1-0 win on Tuesday, with Michael Townsend's second-half dismissal rubbing salt into the wounds for the visitors.
With Paolo Di Canio's Robins next up at Edgar Street, Pitman admitted the League Two strugglers will have to make huge improvements to get anything out of the game.
"That's the worst we have performed in a long, long time so we've got to put that to bed. If we play like that against Swindon we will get annihilated," said Pitman. "I'll dust myself off, I'm bitterly disappointed but I'll have to get them up for it. That's my job.
"It was a poor game. I have to take responsibility for that. I thought we performed poorly throughout but the buck lies with me. I've made a couple of changes which obviously haven't worked. There was no tempo and it certainly isn't one for the scrapbook.
"There were a lot of silly fouls and it was slow, dull and boring. We were just lashing at things. We had no quality and never got any decent balls behind anybody. I don't think there was any quality in the game from either team."