Guernsey were thrashed 59-0 by National League Three London and South East leaders Bishop's Stortford.
After conceding two early penalties John Stocker got the first try after 15 minutes before a second from Richard Gill 10 minutes before the break.
Stocker crossed twice more to help the side lead 33-0 at the break.
Nick Harris got a try with 15 minutes to go, before Sam Coleman, Hamish Irving and a second from Harris sealed the win for the leaders.
The loss means Guernsey are now sixth from bottom and have conceded 242 points in their opening seven games of the season, the third-worst defensive record in the league.