Soybeans cover more than 87 million US acres and are the second-largest drone spray market in America. The primary target is the R2 to R3 reproductive window in July and August, when canopy closure and soybean aphid, spider mite and frogeye leaf spot pressure peak across the Corn Belt, Mid-South and Mid-Atlantic. Purdue University trials confirmed drone applications at 2 and 5 gallons per acre were equally effective as ground equipment for frogeye leaf spot reduction, and University of Illinois Extension reports similar equivalence for white mold management in the northern soybean belt. The biggest economic argument for drone application on soybeans is avoiding the compaction and lodging damage caused by late-season ground rig passes, which University of Minnesota research puts at 4 to 6 percent yield loss on tall R3-stage canopies. Drone operators treating soybeans typically cover 250 to 500 acres per drone per day on T40 or T50 class drones, with many running tank mixes of fungicide plus insecticide. Cover crop overseeding into standing soybeans in September and October has also become a major secondary use case, especially in states with USDA NRCS EQIP cost-share deadlines for cereal rye establishment.
Typical rate: $12 to $18/acre
US acreage: 87M+ acres