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Put Crop Scouting on Auto-Pilot

Jim Ruen | Corn and Soybean Digest

Dale Crawford has his own crop-scouting drone…sitting in the basement. The Sullivan, Ill., corn and soybean grower bought the Canadian-built, CropCam fixed-wing-style, unmanned aerial vehicle (UAV) after seeing one at Commodity Classic about five years ago. He was intrigued by the idea of doing aerial photos for his fields and possibly others.

“I experimented with it some that summer, flying and taking pictures, but I had a couple of rough landings requiring some repair,” Crawford says.

“Flying one isn’t as easy as it was portrayed. There is a lot involved if you want to use it as a hands-on tool.”

Remote sensing with satellite images are proven tools, but they also are expensive and subject to the weather. By contrast, a UAV can be programmed to fly the same path daily, weekly or as desired, at canopy level if desired and at bargain-basement costs.

Images can be gathered with normal light, infrared or thermal, in still and video formats with each image georeferenced for easy ground truthing and replication. Available in a variety of fixed-wing and rotary-wing styles and sizes, UAVs offer superior resolution to other aerial images. This potential was demonstrated at an Iowa Soybean Association On-Farm Network research site this past summer.

A third-year corn field planted with a Pioneer Herculex rootworm-resistant hybrid had been treated with alternating (and replicated) strips of half and full rates of Aztec insecticide applied with a SmartBox at planting. Even with the combined insect protection, normal aerial imagery had shown considerable lodging.

Rory Paul, Volt Aerial Robotics, a St. Louis, Mo.-based UAV consultant and industry advocate, flew his quad-rotor system over the field. “Lodging was even more visible with photos from the drone,” says Tracy Blackmer, director, On-Farm Network. “We used both our normal imagery and the drone imagery to locate field areas with the most lodging, so we could go back in later and pull plants for root ratings.

“In one 20-minute flight over 200 acres, we provided coverage of 3.5 in./pixel, enough to identify individual plants,” Paul says. “If optics are good enough, eventually we may be able to detect pests optically.”

David Schmale, associate professor, plant pathology, physiology and weed science, Virginia Tech University, is taking pest detection to a level beyond optics. His research team is scouring the air above the University’s research farm for Fusarium spores and finding them. The cause of a number of devastating diseases, Fusarium has at least 80 biological species, with even more differentiated on a DNA level. Using isolates ofFusarium gathered on site and in other regions, Schmale has demonstrated that some of the spores overhead are not native to the local soil.

“One of the strains of Fusarium graminearum we collected produces a rare mycotoxin that we’ve been unable to uncover from isolates collected on the ground in Virginia, suggesting it comes from out of state,” says Schmale.

Until now, most microbial research has focused on those in the soil, the plant/soil interface and the plant canopy. His research adds atmospheric microbes to the mix. Schmale is confident this work will contribute to an early warning system for potential epidemics.

“Ideally in the next decade, we would have UAVs scouting for agents that are a threat to plant, animal or even human health,” he says.

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