Toby Faletau returned to action the the Dragons' defeat
Newport Gwent Dragons suffered their first defeat under acting head coach Darren Edwards as they slipped to a five try, 38-17 defeat to Magners League leaders Munster in Cork.
Skipper Steve Jones scored a try for the visitors and Jason Tovey kicked 12 points as the Dragons held the league leaders for almost an hour. But two tries from All Blacks legend Doug Howlett paved the way for full back Johne Murphy to clinch the bonus point.
Irish veteran back row man Alan Quinlan wrapped up Munster's win with a late score and the defeat leaves the Dragons 13 points behind the Scarlets in seventh place in the race for automatic qualification for the Heineken Cup, but with two games in hand.
Wales Under-20s head coach Edwards had made an impressive start since taking temporary charge of the Dragons with four wins and draw from his first five games following the departure of Paul Turner.
The Dragons, who included fit-again Wales squad member Toby Faletau, led 9-6 after a hat-trick of penalties by Tovey despite losing Ashley Smith and Robert Sidoli to injury. But Howlett turned the game with two tries before half-time.
Tovey and wing Adam Hughes combined to hand hooker Jones an easy score as the Dragons hit back just two minutes after the break. But Munster, with several Ireland internationals to call-upon, broke free in the final 20 minutes as Mick O'Driscoll, Murphy and Quinlan crossed to settle the game and keep the Irish province nine points clear of reigning champions in the Ospreys in the hunt for a top two finish to clinch a home Play-Off semi-final.
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Warren Gatland and Sam Warburton look ahead to this week's crunch RBS 6 Nations tie against France, where the Wales skipper in particular is keen to make his mark, as Paris has proved a bleak place for him in the past.
Following their historic win over England, Wales Under 20 suffered a narrow, 36-34 loss to their Scottish counterparts last weekend, despite outscoring them by five tries to three. Watch the match highlights and reaction.
WRU TV go behind the scenes with the Wales squad as they put the final touches in place ahead of the clash against Scotland at Murrayfield. Follow the squad on their captain's run, the kickers visit to Murrayfield and Neil Jenkins' press conference