Corn is the largest crop in the United States at over 90 million acres, and drone fungicide application at the VT/R1 tassel stage is the number one use case for agricultural drones in America. Once corn exceeds six to eight feet, ground sprayers cannot clear the canopy without wheel-track damage that costs 3 to 6 bushels per acre in crushed rows. Drones solve this cleanly because they fly 8 to 15 feet above the canopy and never touch the ground. University trials are decisive on efficacy. Beck's Practical Farm Research across Iowa, Indiana and Illinois showed drone-applied fungicide at 2 to 3 gallons per acre matched ground rig results at 15 to 20 gallons per acre, with an average yield response of 5 to 8 bushels over untreated corn. Iowa State and Purdue Extension confirm the finding for tar spot, gray leaf spot and southern rust pressure years. Drone operators in the Corn Belt treat 300 to 600 acres per drone per day on DJI Agras T50 or Hylio AG-272 class machines during the peak two-week VT/R1 window in late July, and most book up four to six weeks ahead. Tank mixes combining a strobilurin fungicide with an insecticide for western corn rootworm beetle or western bean cutworm are standard on high-value seed corn and stacked-trait fields.
Typical rate: $12 to $18/acre
US acreage: 90M+ acres