By , , (Reuters) - A U.S. appeals court has blocked Bayer AG from selling an agricultural weed killer in the United States, the latest setback for a business already fighting an expensive legal battle over another product.A three-judge panel of the 9th U.S. Circuit Court of Appeals ruled the U.S. Environmental Protection Agency substantially understated the risks related to the use of dicamba, a chemical found in herbicides sold by Bayer and rivals that are sprayed on genetically engineered soybeans and cotton. The herbicides are known to drift away and damage other crops that are not...…By , , (Reuters) - A U.S. appeals court has blocked Bayer AG from selling an agricultural weed killer in the United States, the latest setback for a business already fighting an expensive legal battle over another product.A three-judge panel of the 9th U.S. Circuit Court of Appeals ruled the U.S. Environmental Protection Agency substantially understated the risks related to the use of dicamba, a chemical found in herbicides sold by Bayer and rivals that are sprayed on genetically engineered soybeans and cotton. The herbicides are known to drift away and damage other crops that are not...WW…