Stall on final approach. When the left wing drops from stall instinct is to apply right aileron and pull up on the stick yoke, but this only increases the stall. He was slow in the turn and when the the left wing began to drop in a left roll in a left turn the pilot needed to apply right rudder and push the stick forward to stop the left wing stall and level the plane while adding power. Failed to catch the stall fast enough.
Correct and too close to ground to recover.