Maize (Zea mays) belongs to the grains family Graminae and is known as Queen of Cereals due to its diverse uses. It is an annual monoecious grass of significant importance worldwide. The total area is 178.4 million hectares.
USA, China and Brazil are the top three maize producing countries in the world. Corn is the major staple cereal crop in the USA, where 39.3 m. hectares were grown in 2012, 22.0% of the global area. Establishment of the maize crop can be difficult due to competition from a broad range of weeds that compete for space, light and nutrients. So, herbicide is important for maize. Insect pests such as the European corn borer, corn rootworm and wireworm also affect establishment attacking the shoot, stem and roots. Once established the plant grows quickly, suppressing weed competition for both light and water, particularly when the foliage canopy has closed.
World over, maize is primarily a feed crop even as it finds growing usage as a fuel (bio-ethanol), in value added foods and other industrial applications.