Which post-application assessment is considered most comprehensive when both visual inspection and droplet tests are available?

• A. Visual inspection
• B. Droplet coverage tests
• C. Wind speed measurement
• D. Visual inspection and droplet coverage tests

Answer: (D)

Combining both visual cues and deposition data gives the most complete picture of how well a spray performed. Visual inspection shows whether coverage looks even across the treated area, reveals obvious issues like streaks, misses, or drift onto non-target surfaces, and helps judge whether nozzle patterns are behaving as intended. Droplet coverage tests add a quantitative check, telling you how well the spray actually deposited on the target, the droplet size distribution, and whether the coverage meets label requirements. Taken together, they reveal problems that either method alone might miss and provide a fuller assessment of application quality. Wind speed measurement helps plan applications but doesn’t directly measure actual deposition, so it doesn’t substitute for combining visual inspection with droplet coverage tests.