A crowd of 306 saw Berko hit the OD’s with two goals in the opening 4 minutes from Adam Watkins and Tobi Coker.
Ben Walster added a third in the 37th minute and Coker notched his second of the game on 56 minutes.
Ware ended a run of three successive draws to beat neighbours Hertford Town 2-1 in front of a bumper crowd of 680 at Hertingfordbury Park.
In a game that kicked-off at 2pm, James Ewington scored his second goal since joining Ware after just 2 minutes.
Leigh Rose doubled the visitors` lead in the 14th minute, and they held on to that, despite Eduard Toiny-Pendred pulling one back for the Blues on 73 minutes.
Didcot Town remain in fourth spot after a 2-1 success at Yarnton Road against Kidlington.
Seth Humphries gave the Railwaymen a 13th-minute lead that Connor Barrett doubled from the penalty spot 4 minutes after half-time.
The hosts` only response came 3 minutes into stoppage time from Billy Gillett.
Hadley moved to within a point and a place of Welwyn Garden City in 11th after a comprehensive 4-0 win at Herns Way.
Peter Rosemin after just 5 minutes and Finlay Aldridge right on half-time, gave the visitors a two-goal interval lead.
Then two more in the final 7 minutes from Shehzad Anwar and Luke Alfano made it 4-0.
Bottom side Barton Rovers picked up a point from a 2-2 Sharpenhoe Road draw against Kempston Rovers, who were under new management.
Jemale Olayinka gave Barton a 19th-minute lead that Ben Baker cancelled out 7 minutes before the break.
James Hatch then gave the Walnut Boys the lead with 15 minutes to go, only for former Kempston striker Scott Joseph to level things 5 minutes later.
Cirencester Town’s climb up the table continues with a 4-0 win at second-from-bottom Highworth Town.
The two teams were switched to the Central section in the summer but, after a poor start, the Centurians are now finding their feet and two goals in a minute midway through the first half from Levi Irving and Zach Guinan gave them command.
Andy Lewis made it 3-0 on the hour-mark and then 2 minutes into stoppage time, Reegan Messenger added a fourth.
Thame United and Aylesbury United – both sitting uncomfortably close to the relegation zone, shared a 2-2 draw at The ASM Stadium.
It was goalless at the break, and then two goals came within 5 minutes of each other, with Harry Jones opening up for the Ducks on 56 minutes and Harlem Hale equalising on 61 minutes.
Most clubs are looking for volunteers. Find out more on the button below:
www.PitchingInVolunteers.co.ukAll the news and results in one place.
REGISTER