A fourth clean sheet of the campaign and goals courtesy of Paulius Golubickas, Joe Tomlinson and an Ollie Tomlinson own goal sealed the young Glovers’ first away win this season.
Paul Wilson and Antonio Falanga’s side were dominant from the off but were restricted to mostly long range attempts which failed to test Argyle keeper Michael Cooper.
Yeovil increased the pressure going into the interval and looked highly likely to be the team to break the deadlock.
They capitilised on their ascendency midway through the second period, following a number of stops from Cooper.
Golubickas opened the scoring and 15 minutes later, Joe Tomlinson doubled the visitors’ advantage.
The third goal of the game came late on as a low shot ricocheted off home defender Ollie Tomlinson to seal a convincing victory for the Under-18s.