During pesticide application, 30 50% of the applied amount can be lost to the air (Van den Berg et al., 1999) and it may be one reason for atmospheric organic contamination (Samsonov et al., 1998). To quantify pesticide losses of airborne drift, a useful method is to spray a fluorescent dye (Murphy et al., 2000; Parkin and Wheeler, 1996, Solanelles et al., 1996 and Miller and Hadfield, 1989) and to trap it on passive collectors. This method is cheap and easy to set-up but the efficiency of the collectors has to be evaluated. The cylindrical collectors with a diameter of 2 mm and characterized by a smooth and welldefined surface were the most suitable collectors for airborne drift. However, could exist differences in experimental data compared with theoretical assumptions. This discrepancy is related to the maximum values of efficiency which could be influenced by the phenomena of drop adhesion to the collector line. This paper describes a simple test in wind tunnel to estimate collection efficiency in PVC lines, spraying a mixture of tracer dye and surfactant under diverse conditions of wind speed, lines separation and nozzle configuration.