A new generation of insect larvae is eating the roots of genetically engineered corn intended to be resistant to such pests. The failure of Monsanto’s genetically modified Bt corn could be the most serious threat ever to a genetically modified crop in the U.S.
And the economic impact could be huge. Billions of dollars are at stake, as Bt corn accounts for 65 percent of all corn grown in the US.
The strain of corn, engineered to kill the larvae of beetles, such as the corn rootworm, contains a gene copied from an insect-killing bacterium called Bacillus thuringiensis, or Bt.