CORN PLUMMETS: Corn prices dropped nearly 6 percent after forecasts predicted cooler weather and rain that could benefit crops in parts of the U.S.

ECONOMIC WORRIES: Renewed concerns about the global economy weighed on commodities prices. The Organization for Economic Cooperation and Development warned that the 17 countries that use the euro are at risk of falling into a recession without quick action to help the crisis.

PRICE MIX: Prices fell for gold, silver, copper, oil, wheat and soybeans. Natural gas and palladium ended higher.