Corn prices gained, erasing losses posted in the previous session as the USDA at an annual crop-outlook forum in Arlington, Va., said domestic farmers likely will cut acres planted with the grain this year to 89 mil, down 1.8% from the 90.6 mil acres planted in 2014. The lower acreage figures come as falling crop prices curb profit margins for farmers, forcing some to scale back on production as farm costs rise. Prices for the grain also were boosted by weekly data from the U.S. Energy Information Administration support the robust ethanol production.