Measuring the Effect of Adjuvants on Droplet Spectrum in Drone Applications.
Ulisses Antuniassi (Professor, Sao Paulo State University, Brazil)

Final Program-2025 Spray Drone End User Conference
Breakout Session 2: Spray Drone Research

Description: The objective is to describe and discuss the effect of adjuvants on the droplet spectrum generated by different devices in the simulation of drone spraying applications using a high-speed wind tunnel. Hydraulic and rotary nozzles used in drones were installed in a wind tunnel equipped with a Sympatec Helos particle analyzer. Pure water and several spray solutions were sprayed, the first being the dilution of a SC formulation fungicide in water, and the others containing this fungicide in tank mix with adjuvants (modified vegetable oil, guar-based polymer and surfactants), all adjusted label rates. Spray volume was adjusted to 10 L/ha. The volume median diameter, the percentage by volume composed of droplets smaller than 100 µm and the relative spam data were generated. The results showed that there was interference from the adjuvants according to each type of droplet generator (tips with and without air induction and the rotating nozzle). The performance of the hydraulic and rotating nozzles was different depending on the different adjuvants, just as the nozzles with and without air induction reacted differently to the presence of the various adjuvant technologies. The droplet classes observed when spraying with rotary nozzles were different from those indicated by the manufacturer.

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