Boston Town slumped to the foot of the table as their exasperating start to the season continued.
Jezz Goldson-Williams put Peterborough Northern Star in front after just five minutes before Jack Wightwick equalised at the far post with his third goal of the campaign.
But an error by James Lambley allowed Star to go back in front before the break.
The game took another turn for the worse when Lucas Sparrow was shown a second yellow card halfway through the second period.
Josh Sunter made it 3-1 with an own goal after 73 minutes and ex-Poacher Joe Papworth finished the scoring to complete a third straight league defeat for Nathan Collins' men.
Town: J Lambley, L Lambley, Crowther, S Ashton, Sunter, Clare, D Wood, Wightwick, Trott, Beck, Sparrow