In the management of Spodoptera frugiperda in sorghum, the insecticide use is the main tool recommended, but this method needs to be optimized. The objective of this work was to evaluate the spray volume and spray nozzle effects on chemical control of Spodoptera frugiperda in sorghum. A randomized complete-block design with four replications was used, in a factorial model (3 x 2) + 1: three spray nozzles (hollow cone, turbo twin flat-fan and air induction turbo flat-fan), two spray volumes (200 and 130 L ha-1) and the control (non-treated plot). Fodder sorghum was sown and after the application of the insecticide chlorpirifos, the spray deposition in the plant canopy, the Spodoptera frugiperda control, and the yield were evaluated. The results showed that the turbo twin flat-fan and the air induction turbo flat-fan nozzles provided better canopy coverage than the hollow cone, resulting in a good control of Spodoptera frugiperda and increase of yield. The spray volume of 200 L ha-1 when compared to the 130 L ha-1 propitiated also better control.
application technology; spray nozzles; fall armyworm; Sorghum bicolor
