Organic farmers fear they will lose Bt, one of their primary defenses against pests, because of Bt resistance caused by GM cotton-just as organic advocates warned 10 years ago, when Monsanto's Bt corn and soy came to market.

A new study, released in early February, has discovered boll weevils with field-evolved resistance to Monsanto's Bollgard cotton, which is genetically modified to contain Bacillus thuringeinsus, a naturally occurring soil bacterium deadly to many pests. The study, titled "Insect resistance to Bt crops: evidence versus theory," was published in the February issue of Nature Biotechnology.

Bt-resistant boll worms were found in fields in both Mississippi and Arkansas in ...

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