James Garner (left) hit his first goal of the season
James Garner scored and set up another as Nottingham Forest handed Peterborough their 10th away defeat of the season.
The Manchester United loanee turned in Brennan Johnson's cross from close range to break the deadlock 18 minutes from time.
Ryan Yates then converted Garner's corner from close range to make sure of the points.
Siriki Dembele almost put Posh in front early in the second half when his left-foot shot hit the post, but the visitors' goalless run extended to five matches.
- Relive Saturday's EFL action
Peterborough have picked up just three points on the road in 11 outings and have found the net just once in their last seven league matches.
Philip Zinckernagel looked to set the tone when his 25-yard shot forced Peterborough goalkeeper David Cornell into a diving save in the first minute.
But Forest's Brice Samba was the busier goalkeeper before the break, making saves from former Notts County midfielder Jorge Grant and Dembele, while Forest striker Lewis Grabban put an effort into the side-netting.
Steve Cooper's side responded in the second half, Grabban firing a low strike just wide and Paraguay midfielder Braian Ojeda sending a powerful shot just over the bar.
The hosts cranked up the pressure, but the spectre of a third successive goalless draw began to build until Garner intervened as Forest made it 27 points and one defeat from their past 14 matches.
Steve Cooper's side climb to 13th with their second win in eight matches, while Peterborough remain five points adrift of safety in 22nd.
- Line-upsMatch StatsLive Text
Line-upsNottm Forest
Formation 4-2-3-1
30Samba2Spence4Worrall26McKenna8Colback21Ojeda22Yates20Johnson37Garner11Zinckernagel7Grabban
- 30SambaBooked at 82mins2Spence4Worrall26McKenna8Colback21OjedaSubstituted forRibeiro Diasat 80'minutes22Yates20Johnson37Garner11Zinckernagel7GrabbanSubstituted forTaylorat 85'minutes
Substitutes
- 1Horvath3Figueiredo10Carvalho13Bong17Mighten18Ribeiro Dias33Taylor
Peterborough
Formation 3-4-1-2
13Cornell12Knight2Edwards3Butler4Thompson11Grant18Norburn16Burrows8Taylor10Dembélé9Clarke-Harris
- 13Cornell12Knight2EdwardsBooked at 86mins3ButlerBooked at 64mins4ThompsonBooked at 79mins11Grant18NorburnSubstituted forSzmodicsat 78'minutes16BurrowsSubstituted forCoventryat 68'minutes8Taylor10Dembélé9Clarke-HarrisBooked at 57mins
Substitutes
- 5Beevers6Kent7Szmodics20Coventry21Tomlinson22Corbett28Blackmore
Referee:Thomas BramallAttendance:28,308Match StatsHome TeamNottm ForestAway TeamPeterboroughPossessionHome55%Away45%ShotsHome15Away10Shots on TargetHome3Away2CornersHome5Away3FoulsHome13Away15Live TextPost update
Match ends, Nottingham Forest 2, Peterborough United 0.
90'+3'Full Time
Second Half ends, Nottingham Forest 2, Peterborough United 0.
90'+2'Post update
Cafú (Nottingham Forest) wins a free kick on the right wing.
90'+2'Post update
Foul by Conor Coventry (Peterborough United).
90'Post update
Cafú (Nottingham Forest) wins a free kick in the defensive half.
90'Post update
Foul by Conor Coventry (Peterborough United).
90'Post update
Attempt missed. Philip Zinckernagel (Nottingham Forest) left footed shot from outside the box misses to the left. Assisted by Brennan Johnson.
86'Booking
Ronnie Edwards (Peterborough United) is shown the yellow card for a bad foul.
86'Post update
Lyle Taylor (Nottingham Forest) wins a free kick in the attacking half.
86'Post update
Foul by Ronnie Edwards (Peterborough United).
85'Substitution
Substitution, Nottingham Forest. Lyle Taylor replaces Lewis Grabban.
84'goalGoal!
Goal! Nottingham Forest 2, Peterborough United 0. Ryan Yates (Nottingham Forest) with an attempt from very close range to the centre of the goal. Assisted by James Garner with a cross following a corner.
83'Post update
Corner, Nottingham Forest. Conceded by Conor Coventry.
82'Booking
Brice Samba (Nottingham Forest) is shown the yellow card.
82'Post update
Joe Worrall (Nottingham Forest) wins a free kick in the defensive half.
82'Post update
Foul by Jonson Clarke-Harris (Peterborough United).
80'Substitution
Substitution, Nottingham Forest. Cafú replaces Braian Ojeda.
79'Booking
Nathan Thompson (Peterborough United) is shown the yellow card for a bad foul.
78'Post update
Jack Colback (Nottingham Forest) wins a free kick in the defensive half.
78'Post update
Foul by Nathan Thompson (Peterborough United).
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Source: bbc.com