But they have said this before about DDT, EDB, and many pesticides in the past. And the use of the Bt toxin in genetically engineered crops poses a significant threat to organic agriculture. The Bt toxin is often sprayed on crops by organic farmers when they have insect infestations. When sprayed on organic crops, the Bt toxin dissipates in a day or two. When genetically engineered into non-organic crops, it does not go away.
Insects eat it and die.
However, some insects develop immunity and so do their offspring. Organic farmers are genuinely concerned about how this could undermine their use of the Bt toxin in the future. And there is growing evidence that beneficial insects and birds may be poisoned by eating insects that have eaten the genetically engineered Bt crops. There are many other concerns about genetically engineered foods. These include the long-term health effects on humans, damage to the ecosystem, and the creation of allergens and toxins.