Crop Spraying in Mercer County, Ohio by Drone

Mercer County crop spraying prices

Crop spraying by drone in Mercer County, Ohio is priced per acre for application only; product is billed separately at cost, or you supply it. Ohio State University's custom rate survey reported drone chemical application at an average of $14.64 per acre (median $15, range $7–20), drone seeding at $15.42 and drone fertilizer at $16.50.

Service	Typical rate
Herbicide (corn, soybeans, wheat)	from $13/acre
Fungicide (tassel, R3, Feekes 10.5.1)	from $14/acre
Insecticide	from $13/acre
Cover crop seeding	from $14/acre
Foliar fertilizer or nutrients	from $15/acre

What changes a quote: acres per trip, field shape, wind breaks and wires, gallons per acre required, and whether a pass is broadcast or limited to problem zones. A $250 minimum applies per visit, and neighboring farms often share one trip.

Mercer County, Ohio's livestock powerhouse

The 2022 USDA Census of Agriculture puts Mercer County's farm sales at $1.086 billion, second in Ohio and 49th in the nation. Livestock, poultry and products bring in $866.6 million of that.

Category	2022 sales	Ohio rank
Poultry and eggs	$494.3M	2nd
Hogs	$146.5M	2nd
Milk	$130.8M	2nd
Cattle and calves	$94.0M	1st
All crops	$219.6M	4th

Mercer County's 1,292 farms average 210 acres and carry about 5.8 million laying hens, 242,661 hogs and 90,442 cattle. Crops cover 107,287 acres of soybeans, 101,258 of corn, 11,420 of wheat and 11,297 of forage. All that livestock means manure on most fields, which shapes both crop disease pressure and water rules.

Grand Lake St. Marys and the distressed watershed

Grand Lake St. Marys covers about 13,500 acres in Mercer and Auglaize counties and has had toxic cyanobacteria blooms fed by farm phosphorus and nitrogen since 2009–2010. In January 2011 ODNR designated its watershed "distressed," the only one in Ohio. Farms inside it work under rules that go beyond the rest of the state:

• No manure application from December 15 through March 1.
• No surface manure on frozen ground or more than 1 inch of snow unless it is injected or incorporated within 24 hours.
• No surface manure when there is a greater than 50% chance of more than half an inch of rain in 24 hours.
• Storage for 120 days of manure as of December 1.
• Nutrient management plans for operations handling 350 tons or 100,000 gallons a year.
• Certification and application logs for commercial fertilizer applicators covering 50 acres or more.

Pesticide passes near the lake, the Wabash and St. Marys rivers and county ditches should be planned for drift and runoff. Operators set buffers on watercourses and avoid spraying ahead of heavy rain.

Drone seeding cover crops into standing corn and beans

A 2018 survey of Grand Lake watershed farmers found about 70% use cover crops. Wheat came first, followed by oats, cereal rye and mixes, and about two-thirds of the seed went in with a drill. The barriers growers named were weather and timing, cost and labor. A drone avoids the harvest bottleneck: it broadcasts cereal rye or a mix into standing soybeans at leaf drop or into corn before harvest, so the cover is up before cold weather. Elsewhere in Ohio, Holmes SWCD seeded about 3,700 acres by drone in 2021, including interseeding into standing corn, and multi-species mixes established better than from an airplane. Living cover holds fall-applied manure nutrients that would otherwise move toward the lake.

Disease timing for Mercer County fields

Tar spot

Tar spot has been found in 49 Ohio counties since 2018. By late July 2026 it was confirmed in seven counties, including Darke, Mercer County's southern neighbor. Scout corn from mid-July and plan a fungicide pass around VT–R2 if lesions show up on the lower leaves.

Soybean frogeye leaf spot

OSU treats frogeye as most damaging from R3 to R6, so the fungicide decision is made at R3. White mold infects at R1–R2 but is more of a problem in northeast Ohio.

Wheat head scab

OSU recommends fungicide at Feekes 10.5.1 or within about four days after. Earlier foliar passes at Feekes 8–10 target Septoria, Stagonospora, powdery mildew and leaf rust.

A drone flies over tasseled corn and closed bean rows without wheel damage, and it can still reach wheat when spring rain leaves fields too soft for a sprayer.

Resistant waterhemp and dicamba limits

OSU testing found glyphosate resistance in 87–100% of Ohio waterhemp populations, PPO resistance in 25–77%, and ALS resistance in essentially all of them. Resistance to three or more sites of action is common. Post-emergence passes need layered modes of action applied while weeds are small. Under the 2026 over-the-top dicamba labels (Engenia, Tavium, Stryax), aerial application is prohibited, and that includes drones. Those labels also require a 240-foot downwind buffer and allow only half of untreated tolerant acres in a county on 85–95°F days. Dicamba passes stay with ground rigs, and the drone handles other modes of action.

A typical Mercer County season

Window	Pass
April–May	Wheat foliar fungicide, burndown edges
Late May	Wheat head scab at Feekes 10.5.1
June	Corn and soybean post herbicide
July–August	Corn fungicide at VT–R2; soybean R3 fungicide
August–September	Cover crop seeding into standing crops
October	Cover crop seeding after silage and soybeans

Ohio licensing and airspace for Mercer County

Ohio Department of Agriculture licenses drone applicators under the commercial Category 1 (Aerial), and the application form asks whether the aircraft is manned or a UAV. It requires the Core exam plus the category exam, a copy of the Part 107 remote pilot certificate and drone registration, and a Part 137 certificate for the business. Work for hire also needs a pesticide business license. Operators check the Ohio Sensitive Crop Registry, run through FieldWatch, for beekeepers and specialty fields before flying. Lakefield Airport (CQA), about 4 miles south of Celina, has a 4,400-foot runway. Pilots check NOTAMs and local traffic near the field before every job.