MARSHALL - Krista Stump and Ross Polla announce their engagement. Parents of the couple are Tim and Sandi Stump of Rock Rapids and Mike and Doris Polla of Garvin. Stump attends Southwest Minnesota State University and is pursuing a degree in education. Polla attends SMSU and is studying public relations. The couple plans an Aug. 20, 2011, wedding at Shetek Lutheran Ministries with the reception in Marshall.