 Grains prices and related exchange traded funds are experiencing wild swings as a tight market exposes the agricultural commodity to sudden changes in the outlook with rain now the main focus. Among the worst-performing non-leveraged ETFs of Tuesday, the Teucrium Corn Fund CORN declined 5.7, Teucrium Wheat Fund NYSEArca: WEAT fell 4.3, and Teucrium Soybean Fund . 