Where should ⅔ of spray volume be delivered with mist blowers?

Where should ⅔ of spray volume be delivered with mist blowers?

• A. Upper ⅓ of effective airblast
• B. Lower ⅓ of effective airblast
• C. Across the middle third
• D. Directly at foliage

Answer: (A)

Most spray volume should go into the upper portion of the effective airblast because the misting action deposits first on the top surfaces of the canopy. Delivering about two-thirds of the spray there ensures the upper leaves and outer portions receive thorough coverage, which are the surfaces most exposed to pests and where deposition is most efficient as the spray plume moves through the canopy. Once the upper layer is coated, droplets can settle and drift downward to coat the middle and lower portions without oversaturating them or wasting spray. Spraying primarily on the lower third, across the middle, or directly at foliage would miss the initial interception zone of the airblast, leading to uneven coverage, more runoff, and greater drift losses.

Most spray volume should go into the upper portion of the effective airblast because the misting action deposits first on the top surfaces of the canopy. Delivering about two-thirds of the spray there ensures the upper leaves and outer portions receive thorough coverage, which are the surfaces most exposed to pests and where deposition is most efficient as the spray plume moves through the canopy. Once the upper layer is coated, droplets can settle and drift downward to coat the middle and lower portions without oversaturating them or wasting spray. Spraying primarily on the lower third, across the middle, or directly at foliage would miss the initial interception zone of the airblast, leading to uneven coverage, more runoff, and greater drift losses.