Johnsongrass, one of the most competitive weeds in maize, is actually controlled by broadcast application of at least two herbicide treatment. Agronomists López-Granados et al. designed a high-resolution method to locate weeds using drones to take visible and near infrared pictures, then algorithms to map johnsongrass patches (light green) in maize rows (dark blue). They deduce that site-specific control would save up to 95% herbicides, which will be consistent with European and the Spanish legislations.
