Turbin's longest play was a 77-yard catch of a screen pass for a touchdown in the second quarter. Quarterback Diondre Borel was 15-of-21 for 316 yards.
Michael Smith rushed eight times for the Aggies, gaining 100 yards and two touchdowns.
Southern Utah's Cade Cooper was 24-of-48, passing for 250 yards and three touchdowns. Fesi Sitake caught nine passes for 98 yards and two touchdowns for the Thunderbirds (1-3).
USU quickly gained a 14-3 first-quarter edge as quarterback Borel was 4-of-4 with a touchdown pass to Smith. Wide receiver Stanley Morrison also tossed a touchdown pass early - to Turbin - on a receiver-option play to surprise SUU.