UPDATE 1-Slow U.S. winter thaw needed to avoid more wheat damage-USDA
March 04, 2014 at 01:01 AM EST
CANBERRA, March 4 (Reuters) - A gradual end to the U.S. big freeze is needed to prevent further damage to the country's wheat crop, the chief economist at the U.S. Department of Agriculture (USDA) said on Tuesday.
