Corn and Wheat Futures Erase Gains

May Corn is trading at 374 1/2 , up 6 1/4 cents/bushel. July Corn is trading at 382, up 6 1/4 cents/bushel. May Chicago Wheat is trading at 445 1/4, up 6 1/2 cents/bushel. May Kansas City Wheat is trading at 463 1/2, up 6 1/2 cents/bushel. Corn and wheat futures are trading choppy and have erased most of the session gains.