The youngster who has been in blistering form of late beat Jack Bycroft in the rival goal after 32 minutes to double his team's lead.
The goal took his tally to seven in his last ten games across all competitions.
While he was replaced with six minutes left to play, Arthur Okonkwo and Ryan Alebiousu were non-playing substitutes for the Gunners here.
For the Saints, midfielder Roland Idowu was introduced from the bench after 84 minutes of play.
In the provisional standings, the Gunners,U18s who have won five games on the bounce, lead the way with 39 points from 15 matches, one more than Tottenham Hotspur who have a game in hand.
Arsenal would be guaranteed qualification for next season's UEFA Youth League if they are crowned national champions of the U18 Premier League.
Emmanuel Chinaza
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