Two goals late in each half added to one midway through the first half made this result look more convincing than it really was.
The young Yachtsmen made a fight of it and with a bit more invention in front of goal may have got something from the game.
Wroxham started against a strong wind on a pitch which was going to cut up after heavy rain the previous day. The home side had a chance for an early lead when the dangerous Danny Jezedh worked his way forward and cut inside to get in a shot but it was weak and well wide.
A lovely ball in by Matt Doyle almost found Danny Broom but the Dersingham 'keeper, Matty Hails, got down to save.
strong run and cross from Ryan Guild was cleared only as far as Cain Eagleton whose powerful return shot went a couple of yards wide.
After a bright start Wroxham fell behind on 16 minutes when a long kick from Hails found Jezedh who cleverly took advantage of the wind to lob Joe Green from 20 yards with the ball dipping under the bar.
Wroxham retaliated and went close when Broom got to Guild's pass before the 'keeper but lifted his shot over and wide.
Dersingham were getting on top when a lovely cross from Gary English fell for Tom Anderson who missed a clear finishing opportunity in the six yard box.
Then a shot from Aaron Proctor was cleared off the line by Tyler Curran and behind for a corner. From this Anderson's header also went wide. Wroxham almost fell further behind when Proctor's free kick hit the bar.
Just as it seemed Wroxham might go in only one goal down the home side scored a second almost on half-time. Paul English crossed and Simon Bird on his debut got a touch to direct the ball goalwards. It looked as if young Wroxham 'keeper Joe Green had brought off a good save but the assistant on the far side judged the ball had crossed the line.

HT Dersingham 2 Wroxham Res 1
The visitors almost fell further behind early in the second half when Jezedh was clean through but his finish was wayward.
Wroxham took heart from this and for most of the remainder of the second half were camped in the Dersingham half. They almost pulled one back in the 70th minute when Curran's cross on the run found Broom who side stepped his marker to make space to get in a rasping shot that crashed off the post with Hails beaten.
Then Broom had another chance receiving a lovely pass from Guild but was unable to direct his shot on target and it went wide.
Both sides made substitutions but it was Dersingham who benefitted from theirs with a late break away goal. Zac Fountain got into a position to get in a cross from the right which fell perfectly for substitute Jack Johnson to head past Green.

FT Dersingham 3 Wroxham Res 0