Argument: Insects are likely to become resistant to GM crops
Deborah B. Whitman. "Genetically Modified Foods: Harmful or Helpful?" CSA. April 2000: "Just as some populations of mosquitoes developed resistance to the now-banned pesticide DDT, many people are concerned that insects will become resistant to B.t. or other crops that have been genetically-modified to produce their own pesticides." In other words, GM crops are not necessarily more cost-effective than non-GM foods that rely on pesticides.