Drone Spraying in Mercer County, KY for Pasture, Hay and Grain

Drone spraying prices in Mercer County, KY

Drone spraying in Mercer County, Kentucky is billed per acre for application only. Product is charged separately at cost, or you supply it from your co-op. Published Kentucky drone rates run from about $12 to $25 per acre. For comparison, the University of Kentucky's 2024 custom rate survey puts manned aerial application at $11.50 per acre on average, with a range of $9.50 to $14.50.

Service	Typical rate
Pasture and hayfield herbicide	from $13/acre
Hay insecticide (armyworm, weevil)	from $13/acre
Corn and soybean fungicide	from $14/acre
Wheat head scab fungicide	from $14/acre
Cover crop or pasture seeding	from $15/acre

Price factors include total acres per trip, slope and tree cover, how scattered the fields are, and whether the job is broadcast or spot work on thistle and hemlock patches. Work is billed on a 20-acre minimum per trip, so small hayfields are often scheduled together.

Mercer County farms at a glance

The 2022 USDA Census of Agriculture counts 978 farms on 142,272 acres in Mercer County, averaging 145 acres. Sales reached $57.7 million, up 26% from 2017. Cattle numbers stand at about 37,600 head, with 1,571 horses and ponies.

Crop	Acres (2022)
Forage (hay and haylage)	29,959
Soybeans	12,258
Corn for grain	7,344
Wheat	3,638

Hay and pasture are by far the largest acreage, so most drone work in the county is grass-focused. Grain fields concentrate on the flatter uplands around Harrodsburg, Burgin and Salvisa.

When to spray Mercer County pasture weeds

University of Kentucky guide AGR-207 ties each weed to a treatment window. Missing it usually means living with the weed for another year.

Weed	Life cycle	Best window
Poison hemlock	Biennial	November, or March–April
Buttercup	Annual	February–March
Musk and bull thistle	Biennial	October–November or February–March
Canada thistle	Perennial	Pre-bud, or October–November
Tall ironweed	Perennial	June–August
Horsenettle	Perennial	July–August
Cocklebur	Annual	May–July

Products rated good in AGR-207 include 2,4-D, dicamba plus 2,4-D, and premixes such as GrazonNext, DuraCor and Chaparral. Always check grazing and haying restrictions on the label, and keep clover in mind, because most of these products will thin it. A drone can treat hemlock along fence lines and creek banks in March, when wet bottoms keep a tractor out.

Armyworm and alfalfa weevil in Mercer County hay

Fall armyworm shows up from midsummer until the first killing frost. UK Extension treats pasture at more than 3 larvae per square foot, ideally while larvae are three-quarters of an inch or smaller. Larvae feed at night, and new seedings and drought-stressed stands are most at risk. Scout at dawn or dusk, and call early: a field can be stripped in a few days.

Alfalfa weevil scouting should start at about 190 degree days, usually the third week of March in central Kentucky. If larvae are building near the first cutting, an early harvest may beat spraying.

Fungicide decisions for corn, soybeans and wheat

UK grain crop specialists rate gray leaf spot risk as high across most of Kentucky, and southern rust typically arrives around mid-July. A single fungicide pass at VT–R1 is usually the most effective timing in corn. Tar spot had not been confirmed in Kentucky as of the 2025 UK update. In soybeans, frogeye leaf spot is the common target at R3. Wheat head scab passes are made at early flowering. A drone flies over tasseled corn and full soybean canopies without crushing rows, which matters on smaller Mercer County fields where turn rows take up a large share of the acres.

Note on dicamba: the 2026 over-the-top dicamba labels for tolerant soybeans prohibit aerial application, including drones. Those passes stay with ground equipment.

Palisades, Herrington Lake and hilly ground

The Kentucky Geological Survey describes Mercer County as gently rolling to hilly. Along the eastern edge, the Kentucky and Dix rivers and Herrington Lake sit 350–400 feet below the uplands in the palisades. The west side is hilly, with flat ground mostly in the Salt and Chaplin river valleys. Herrington Lake, formed in 1925 when Kentucky Utilities dammed the Dix River, is the deepest lake in Kentucky at 249 feet. Steep hayfields above these valleys are hard to spray safely with a tractor, and runoff reaches water quickly. Operators keep buffers from the lake, rivers and sinkholes and avoid spraying ahead of heavy rain.

Horse farms, Shaker Village and sensitive neighbors

Mercer County has more than 1,500 horses on farms, many grazing next to cattle pasture and grain. Shaker Village of Pleasant Hill manages about 3,000 acres of farmland, native prairie, forest and wetland, and farms part of it organically. Beehives, gardens, tobacco and vegetable plots are scattered among the hay ground. Pilots ask about neighbors before each job, choose coarse droplets, fly only with wind blowing away from sensitive sites and log wind speed and direction for every field.

Mercer County spray calendar

Months	Typical drone work
February–March	Buttercup, early thistle, wheat weed control
March–April	Poison hemlock; alfalfa weevil scouting
April–May	Wheat flowering fungicide (head scab)
June	Pasture broadleaf, corn and soybean herbicide
July–August	Corn fungicide at VT–R1; ironweed and horsenettle; soybean R3
August–October	Fall armyworm in hay; cover crop seeding
October–November	Thistle rosettes, hemlock, Canada thistle

Kentucky licensing and airspace

In Kentucky, every drone pesticide application must be made by a Category 11 (Aerial) applicator, whatever the product. The exemption for farmers using ground equipment on their own land does not cover aerial work. Category 11 is paired with a site category such as 1A (Agricultural Plant). Operators also hold FAA Part 107 and Part 137 certification and a Section 44807 exemption for drones of 55 pounds or more. Mercer County has no public airport. The nearest are Danville's Stuart Powell Field (DVK), south of the county line, and Blue Grass Airport (LEX), about 23 miles from Harrodsburg. Pilots still check LAANC and NOTAMs, especially toward the northeast corner.