Effect on Biodiversity

Effect on Biodiversity

There is a bacterium that is naturally toxic to certain beetles and insects. Scientists have taken the gene that produces the toxin in the bacterium and engineered it into potato and corn plants. Now the potato and corn plants produce the same toxin, so any of the beetles or insects that eat them are poisoned by the toxin in the potato and corn plants. As the plants produce their own insecticide, farmers do not need to spray them with conventional insecticide, with the result that there is less pesticide residue on these plants. In this sense, these GE plants are better for us. But they now contain a gene that produces toxins. Is this good for us?
As well as the target pests, many beneficial beetles and insects are killed. Monarch butterfly larvae died when they came into contact with pollen from GE corn. What will be the effect on beetles, mice, birds, etc. that eat the beetles and insects that have been poisoned by the toxin in the potatoes and corn? In other words, what will be the effect on the environment? Some fear that proliferation of GE crops may result in huge losses of biodiversity and all the dangers that entails.
The GE potatoes and GE corn just mentioned are meant to reduce the need for pesticide. Other plants are genetically engineered to withstand pesticide. A gene that is naturally resistant to Monsanto's Roundup herbicide has been inserted into canola. So a farmer can spray a field of GE canola with almost as much Roundup as he/she likes, and while the weeds will be killed, the canola will be unaffected. So herbicide-resistant GE crops may encourage farmers to use more pesticide. There would be more pesticide residue on these crops.
In some places, the bacteria needed for breaking down vegetable matter so that the soil is fertilized are being wiped out by excessive use of Roundup. The soil is becoming inert, and so much so that dead weeds do not rot.
When a farmer harvests a crop like soy, some falls on to the ground and may remain there till the following growing season, when it may grow spontaneously. If the farmer is growing a different crop, the soy is now unwanted, a weed, and the farmer may want to kill it with herbicide. Herbicide-resistant GE soy cannot be killed with ordinary herbicide and farmers in Argentina, for example, use a potent cocktail of different chemicals, including 2-4,D and, it is thought, Paraquat. This cocktail is causing environmental havoc. Some of the chemicals are blown by the wind on to neighboring fields, into streams and lakes, and on to people. It is causing skin blemishes on children, farm animals to be born deformed, bananas to sprout from the middle of the branch instead of the top, lakes filled with dead fish.