This work focuses on designing of the agricultural duster for sulfur-based plant protection in the date palm trees. The investigation was performed using two main working parameters: three working pressures (10, 15 and 20 bar) which required to emerge the sulfur powder to tree canopy, and six types of outlet gates geometric (circular, rectangular, fan-shaped, tapered longitudinal, square openings, and interlaced openings) arrangements through which dust powder is discharged. The Prototype of duster was subjected to controlled experiments in an attempt to measure the variability of the following critical performance parameters including the actual discharge rate, effective dust width, treated distribution area, and powder spread angle. The completely randomized design was used to analyse effect of parameters studied. The findings of the work are expected to provide useful insights for designing duster applicators more efficiently, uniformly, and sustainably for using in the palm trees. The prototype design involves a significant increase in the efficiency of sulfur dusting by reducing the amount of discharge on the trees in comparison to tradition method. The results also illustrated that the fan-shaped gate generated the largest average (0.81 m) in effective dusting width, the largest spread powder angle (44.09°), the biggest performance in spread area (0.515 m2) at all investigated pressures and are less sensitive to operating pressure. This outcomes in an improvement in environmental impact and the worker’s’ health conditions. However, the dusting equipment can represent a safety risk for the workers because of their interaction with the parameters used.