Spray Drone Rules

Two regulators look at every spray flight

Spray drones sit where aviation and plant protection overlap, and each side runs its own approvals. The aviation authority is concerned with the aircraft, the pilot and the airspace, while the pesticide regulator is concerned with the product, the dose and who might be exposed downwind. Clearance from one never covers the other, so work on both tracks at the same time rather than one after the other. Start by listing the crops, the products you intend to apply and the fields involved, because nearly every application form asks for those details. Then identify the national bodies for each track where you farm, read their current guidance and keep copies of every permission with your flight kit.

Britain issues a permit for each application

In Great Britain, HSE's aerial spraying permit arrangements state that a permit is needed every time a pesticide is applied from the air, and that this includes every application by drone. HSE also says there are currently no commercial authorisations for applying pesticides by drone in the UK, so for now a product must be covered by an Extrapolated Trials Permit. Applicants need the PA1 and PA6 qualifications or an equivalent, an authorisation from the Civil Aviation Authority and measures to warn the public and keep them away. Near protected sites, HSE consults nature conservation bodies, which can stretch processing to a month. Build those lead times into your season plan.

The US route runs through Part 137

In the United States, the FAA treats spraying or spreading by drone as an agricultural aircraft operation under 14 CFR Part 137. The rule separates private operators, who may treat only land they own or lease, from commercial operators, who work for others and face extra requirements. Section 137.19 sets out the certification steps, including knowledge and skill testing, while section 137.51 sets conditions for work over congested areas. Part 137 also expects dispensing to follow federal product registration and labelling rules. Section 137.41 deals with the people who supervise operations and act as pilot in command, so decide early who in your business will fill those roles and keep their records current.

Check the label, the aircraft and the drift

Aviation approval does not make a product legal to apply from the air. Read each label and any extension of authorisation for aerial or drone use, the permitted crops, the water volume per hectare and the buffer zones. Then compare those conditions with what the aircraft can deliver: ask the makers of the DJI Agras T50, XAG P100 Pro, AutoCopter G15 or Rantizo Spray Drone Kit for nozzle options, droplet size settings and flight logs that show where product went. Keep spray records as you would for a boom sprayer, adding flight height, speed and wind readings, because those details answer complaints from neighbours and questions from inspectors.

Sources and further reading

• Aerial spraying permit arrangements — Health and Safety Executive (UK).
  HSE's rules for applying pesticides from the air in Great Britain, including drone permits, qualifications and CAA approval.
• 14 CFR Part 137: Agricultural Aircraft Operations — US Federal Aviation Administration (eCFR).
  US rules for agricultural aircraft operator certificates, supervising personnel, dispensing and work over congested areas.
• Dispensing Chemicals and Agricultural Products (Part 137) with UAS — US Federal Aviation Administration.
  FAA explanation of how spraying by drone is handled under Part 137 and which certificate and exemptions operators need.

Common questions

Do I need insurance to fly a spray drone?

Check with both your insurer and your aviation authority. Commercial drone work often requires third-party liability cover, and spraying adds risks such as drift onto neighbouring crops, livestock or water. Ask the insurer to confirm in writing that aerial pesticide application is covered, not just flying.

Do spray drone rules differ between countries?

Yes, sharply. Some countries allow drone application of many products, others only under trial permits or case-by-case approval. Before importing an aircraft, confirm both the aviation category it falls into and whether each pesticide you use is authorised for drone application where you farm.