Fielding a reasonably strong line-up the Golden Boys fell behind as early as the third minute as the hosts took advantage of indecision within the visitors' rearguard.
However, the setback merely galvanised
Five minutes later and the tie was won, Albert Jarrett netting what proved to be the winner with a neat close range header.
Watford: James Beasant, Marvin McCoy, Jordan Parkes, Alex Campana, Adrian Mariappa, Junior Osborne, Anthony McNamee, Toumani Diagouraga, Liam Henderson (Kieran Forbes 75), Ewan Clarke, Albert Jarrett.
Subs not used: Aaron Beech, Alec Chamberlain, Dale Bennett, Lewis Young
Other First Round Results
Hitchin Town 5 Tring Athletic 0
Boreham Wood 2 Ware 0
Broxbourne Borough V & E 4 St Margaretsbury 3 (AET)
The fixture between
Revised Second Round Draw
Hitchin Town v Bishop's Stortford
Oxhey Jets v
Stevenage Borough v
Leverstock Green v Boreham Wood
Barnet v Welwyn Garden City