<div><p>WASHINGTON (Reuters) - U.S. regulators have sent letters to Wal-Mart, Target, Kmart, Amazon and 74 other companies warning them that rayon clothing and other products cannot be labeled as bamboo, the Federal Trade Commission said on Wednesday.</p><p>The letters, which were sent last week, require companies to distinguish between bamboo and rayon, which can be made from any plant cellulose and is made with harsh chemicals.</p><p>"While we have seen action by some retailers to correct mislabeled clothing and textile products, our hope is that these warning letters will serve as a wake-up call to all companies, regardless of their size," said David Vladeck, director of the agency's Bureau of Consumer Protection.</p><p>"Rayon is rayon, even if bamboo has been used somewhere along the line in the manufacturing process," he said.</p><p>The letters were sent last week.</p><p>Telephone calls to Wal-Mart, Target, Amazon and Sears, which owns Kmart, were not immediately returned.</p><img src="http://admatch-syndication.mochila.com/images/ad.gif?aid=68397572&bid=informcom" /></div><div id="copyright"><div>

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