Surfactant use in spray solutions has a major advantage of reducing droplet surface tension and increasing deposition. We aimed to evaluate droplet deposition on cattail plants (Typha subulata) using food coloring (Brilliant Blue -FD & C-1) as marker added to spray solution at two different growth stages: vegetative (4 leaves) and flowering (5 leaves). The treatments were arranged in a completely randomized design with four replications and five plants per plot (16.2-L tanks). Treatments consisted of adding into spray solutions Brilliant Blue alone (control), Brilliant Blue + 0.5% v/v Aterbane and Brilliant Blue + 0.01% v/v Silwet. Spraying was performed by a pressurized CO 2 sprayer at 220 kPa using two Teejet XR 8002 nozzles at a spray volume of 200 L ha -1 . We observed that surfactant addition provided uniform deposition of spray solution on T. subulata plants at both growth stages compared to treatments without surfactant. However, this product has not increased spray deposits on cattail leaves at both stages. A aplicação dos tratamentos foi realizada com um pulverizador pressurizado com CO 2 a 220 kPa, utilizando duas pontas Teejet XR 8002, a um volume de 200 L ha -1 . A adição dos surfactantes proporcionou deposição uniforme da calda de pulverização nos dois estádios de crescimento das plantas de T. subulata estudados, em relação à calda sem surfactante, porém seu uso não aumentou os depósitos nas folhas da taboa, em ambos os estádios de desenvolvimento. KEYWORDS: