Monsanto Co. corn that is genetically engineered to kill insects may be losing effectiveness against rootworms in four states, the U.S. Environmental Protection Agency said.
Rootworms in Iowa, Illinois, Minnesota and Nebraska are suspected of developing tolerance of the plants’ insecticide, based on documented cases of severe crop damage and reports from entomologists, the EPA said in a document dated Nov. 22 and posted yesterday on the government website. Monsanto’s program for monitoring suspected cases of resistance is “inadequate,” the EPA said.
An Iowa State University study said in July that some rootworms have evolved resistance to an insect-killing protein derived from Bacillus thuringiensis, or Bt, a natural insecticide engineered into Monsanto corn. Entomologists in Illinois and other Midwestern states are studying possible resistance where the insects devour roots in Monsanto’s Bt corn.
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