United were hit for six as newly-crowned league champions Peebles proved that they were just too strong for the Kelso youngsters.
Having secured the league with a 6-2 win over Ormiston in midweek, Rovers were still on a high.
A hat-trick from young winger Donavan Ndiweni, and goals from Chris Flockhart, Daniel Mcaleavy and Greig Dodds, gave the visitors a convincing win, with Kelso’s Ewan Hutchison getting the home team’s goal.
“We were in the game until two minutes from half-time and losing two quick goals just before the break knocked the stuffing out of us,” commented United manager Prof Blaikie.
The visitors took the lead with only five minutes gone as full back Lee Zavaroni crossed from the right; the ball was parried by home keeper Elliott Turnbull, but only into the path of Chris Flockhart, who fired home.
United fought back and equalised in the 19th minute as Turnbull launched a kick out down the right which found Liam Hill. The youngster fed Ewan Hutchison, who blasted home from the edge of the box, giving Rovers keeper Darren Walker no chance.
Turnbull was then called into action, having to turn away a scooped shot from striker Paul Murray.
A mistake in midfield by the home side saw Ndiweni take advantage, the winger driving forward before shooting from 25 yards into the bottom corner of the net.
The visitors went further in front in the 43rd minute as defender Daniel Mcaleavy found space 20 yards out and thundered a shot past Turnbull.
In the last minute of the half, Rovers increased their lead as Ndiweni picked up the ball and hammered home his second goal of the afternoon.
The youngster completed his hat-trick with seven minutes of the second half gone. A free kick from Mcaleavy from 22 yards out cannoned of the United wall and Ndiweni was first to react to poke the ball into the net.
Midway through the second half, United defender Darren Bowie cleared a Zavaroni effort off the line following good work by Ndiweni.
The visitors made it six in the 67th minute as Flockhart ran down the right and crossed into the box where Greig Dodds slotted home unopposed.
United could have had a second three minutes from time, however, Ryan Beveridge scooped a shot over the bar.