McDonald's to bar GMO fries Report: fast-food chain to stop using genetically modified potato products April 28, 2000: 7:55 a.m. ET NEW YORK (Reuters) - Fast-food chains including McDonald's Corp. are telling their french fry suppliers to stop using Monsanto Co.'s genetically modified potato, according to the Wall Street Journal. J.R. Simplot Co, a major McDonald's (MCD: Research, Estimates) supplier, has told its farmers to stop growing the potato developed by Monsanto, which is now a part of Pharmacia Corp (PHA: Research, Estimates). PepsiCo (PEP: Research, Estimates) unit Frito-Lay Co. said Thursday that it was asking its farmers not to grow genetically modified potatoes this year, the Journal said. Earlier, the company told its corn farmers to stop growing genetically modified crops. The modified crops are easier to grow and heartier than conventional varieties. Critics have raised questions about the safety of modified crops and their impact of the environment. Studies show many U.S. consumers want labels on foods that contain genetically modified ingredients. McDonald's shares fell 1/16 Thursday to 38-13/16. PepsiCo stock skidded 5/16 to 37-7/16, while Pharmacia dipped 1/4 to 52-1/2.