Abstract
Weeds have been proved as the ultimate pests of crop plants. Use of herbicides has become one of the best solutions to control weeds on a large scale. Due to ignorance, less diversity in herbicides, and their availability in local markets and cost affordability etc. The farmers use only one or a few major herbicides for long time, and it causes the herbicide resistance in weeds. Genetically modified (GM) herbicide-resistant (HR) crops have been blindly cultivated by farmers throughout the world, especially in the United States. GE crops have been blamed for increased problems with HR-weeds. Due to adoption of GM, herbicide-resistant cultivars substantially reduced herbicide diversity in maize, cotton, and soybean. Intensive use of glyphosate in these crops largely displaced herbicides that were likely to be selected for HR-weeds and the impact of reduced herbicide diversity has been mitigated. It has been expected that if the same pattern of use of herbicides continues, more HR-weeds will develop and the need for developing more HR-crops will increase.
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