Herbicide resistant crops. Field of young cotton plants with a maize plant (Zea mays, centre) growing as a weed. The cotton saplings are genetically modified (GM) Roundup Ready cotton plants (Gossypium hirsutum), that is they have had a gene introduced by genetic engineering that allows resistance to this herbicide. A crop of Roundup Ready cotton can therefore be sprayed with the herbicide to kill weeds without damaging the cotton. However, the maize is also a Roundup Ready plant, so it cannot be killed using Roundup. The farmer may be able to eliminate this volunteer crop by using a different herbicide. Photographed in Arkansas, USA.
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