A system was developed to determine spray mix uniformity with time in nozzle supply lines and lag timerequired to reach expected concentrations at various nozzle positions. The system, using sample bottles, consisted ofcomputer-controlled, variable-speed turntable. Computer control allowed the operator to collect samples easily at anynozzle while a simulated sprayer underwent changes in specified travel speeds. A commercial control and metering pumpwere used to evaluate the turntable sampling system performance for mixtures containing a fluorescent tracer and eitherwater or Prime Oil II (55.61 mPas) as a simulated pesticide. Spray samples were collected from the nozzle during thedesired time period and analyzed with a spectrofluorometer. The injection spray system required a spiral mixer in theinjection chamber to maintain uniform mixture when Prime Oil II was used as the simulated pesticide. Lag time was20.3 s at the nozzle at the end of the 1.07 cm (3/8 in.) diameter and 5 m (16.4 ft) long boom and was 42.2 s at the nozzle atthe end of the 2.09 cm (3/4 in.) diameter and 5 m (16.4 ft) long boom when travel speed linearly increased from 1.6 to6.4 km/h (1 to 4 mile/h) in 5 s.