What is the maximum recommended spray pressure when using pattern-producing nozzles?

The maximum recommended spray pressure when using pattern-producing nozzles is indeed 40 psi. This pressure is considered optimal for achieving a uniform spray pattern and adequate droplet size. At this pressure, the nozzles can create a fine mist that promotes better coverage and adherence of the pesticide to the target surface, which is essential for effective pest control.

Using pressures higher than 40 psi can lead to a range of issues, such as drift, where droplets are carried away by wind and may not reach the intended area. Additionally, excessive pressure can result in smaller droplet sizes, which can further increase drift potential and reduce the efficacy of the pesticide. Conversely, lower pressures may not generate sufficient force to create a proper spray pattern, resulting in uneven application.

Hence, maintaining the spray pressure at or below 40 psi ensures optimal performance of the nozzles while minimizing potential negative impacts associated with aerial pesticide application.