A total of 49 petri disks in 0.3 m square grids were used to cover the 1.80 × 1.80 m2 floor area with the test using 72.5 cm side length hexagonal curved spray boom while a total of 64 petri disks in 0.45 m square grids were used to cover the 3.60 × 3.60 m2 floor area with the test using the boom side 0.975-m long.