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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.

But even though a scientific advisory panel warned the Environmental Protection Agency (EPA) that the threat of insects developing resistance was high, Monsanto argued that the steps necessary to prevent such an occurrence — which would have entailed less of the corn being planted — were an unnecessary precaution, and the EPA naively agreed.