Hull (0) 6
Hull KR (16) 42
Salford have been relegated from Super League after Hull KR demolished Hull in the city derby at the KC Stadium.
Tries: Netherton, Dyer 2, Lennon, Lovegrove 2, Webster, Gene
Goals: Cooke 5
Needing just one win from their final three games for safety, Rovers raced into a 16-0 lead with a try from Jason Netherton and two from Luke Dyer.
Mark Lennon made it 22-0 before Hull responded with Danny Washbrook's score.
But the result never looked in doubt and further tries from James Webster, Stanley Gene and two from Rhys Lovegrove sealed Salford's fate.
They just played better than us, simple as that
Salford's relegation is their second in five years and comes just a year after they reached the Super League play-offs for the first time.
The Reds never recovered after a dreadful start to the season which saw them win just three of their opening 14 league matches.
The run led to the dismissal of coach Karl Harrison in May following the dismal 66-6 at the hands of Catalans in May.
Australian Shaun McRae was appointed as Harrison's successor but has only been able to claim two wins in his nine games in charge and Friday's loss to Wigan left Salford on the brink of relegation.
Despite the importance of the game, Rovers did not start nervously and took a deserved lead when the inspirational Paul Cooke, who controversially switched from Hull earlier this season, created Netherton's try on 13 minutes.
Hull, who went into the game with six wins from their last seven matches, struggled to create many chances and Rovers went further ahead after Dyer converted from a Kirk Yeaman mistake.
Dyer ran in from 70m just before the break and with Cooke creating havoc in the Hull defence with a fine kick-through, Lennon grabbed his try after half-time to effectively secure survival.
It's quite satisfying to come here and stuff them
Hull KR boss Justin Morgan
Washbrook's surge to the line on 57 minutes gave the home side brief hope but that was extinguished when Lovegrove brushed off Shaun Briscoe's tackle to score.
Skipper Webster produced a fine solo effort to extend the advantage before Gene and Lovegrove completed the rout.
Hull coach Peter Sharp:
"We're embarrassed. They just played better than us, simple as that. They ran with purpose and tackled with commitment and there's the game. That's life.
"This happens in team sports, these things happen. They just beat us to the punch in everything they did. They ran out better than us, they warmed up better than us.
"We'll be okay, we'll dust ourselves off tomorrow and get stuck into it. We were probably a bit full of ourselves to tell the truth. We will bounce back, I promise you."
Hull KR coach Justin Morgan:
"I'm very proud, not just with the victory, but with the performance. To do it with the added pressure that we could secure our Super League future is a huge effort.
"I enjoyed the last 10 minutes for the first time in a long time. There were some great heroes out there.
"We know about the bitterness and anger between the two clubs, not on the pitch but certainly there are the politics being played like my media manager not being allowed in the dressing room and things like that. It's quite satisfying to come here and stuff them.
"It was a nice trademark performance from Paul Cooke, he's a cool customer and he's been very good for us. I've never seen a team execute a game plan as clinically as we did."
Hull: Tony, Briscoe, Hall, Yeaman, Raynor, R. Horne, Head, Dowes, Godwin, King, Radford, Manu, Tickle.
Replacements: Whiting, Maiava, Wheeldon, Washbrook.
Hull KR: Hardman, Lennon, Lovegrove, Dyer, Bauer, Cooke, Webster, Vella, Fisher, Tandy, O'Neill, Chester, Murrell.
Replacements: Gene, J Netherton, Gannon, Tangata-Toa.
Referee: S Ganson (St Helens)