(Reuters) - The U.S. economy remains too delicate for Constellation Brands Inc to lead any attempt to raise wine prices, even as a smaller harvest is expected to make grapes more expensive, a senior executive said on Friday. As a result, the world's largest maker of branded wine, with names like Robert Mondavi and Ravenswood, does not expect to raise prices this year -- unless other producers do so first. "We're not going to lead the charge," said Constellation Brands Chief Financial Officer Bob Ryder in an interview.