Douala had pace to burn and should have done better when he got behind the Wigan defence but with team-mates pleading for a cross, his shot from a narrow angle was easily handled by Kirkland.
But Zemmama's quick cross from a tight angle on the right by-line was missed by Nish and Riordan before Wotherspoon tried a snap shot in the last action of the half that Brown dived to smother.