What happens to the effectiveness of spray if nozzles experience pressure above 25 psi for drift control?

When nozzles experience pressure above 25 psi, the effectiveness of the pesticide spray in terms of controlling drift is compromised because higher pressures create smaller droplets. These drift-sized droplets are more easily carried by the wind, which can lead to off-target application and reduce the concentration of the pesticide where it is needed most. By generating more drift-sized droplets, the potential for the pesticide to affect non-target areas increases, which is particularly problematic in aerial applications where precision is critical.

Maintaining proper nozzle pressure is essential for achieving the desired droplet size that minimizes drift while ensuring adequate coverage of the target area. Lower pressures are often recommended to produce larger, more stable droplets that can effectively reach the intended surfaces without excessive drift. This understanding is crucial for anyone involved in aerial pesticide application to ensure compliance with safety regulations and to maximize the efficacy of the application.