Which type of nozzle is most suitable for residual spraying on surfaces?

Flat spray nozzles are the most suitable for residual spraying on surfaces due to their ability to produce a wide, uniform spray pattern that effectively covers large areas. This design allows for a consistent application of pesticide over surfaces, which is crucial for ensuring that the pesticide adheres properly and remains effective over time.

By utilizing a flat spray nozzle, the spray droplets can spread out across the surface, enhancing the likelihood of the pesticide forming a residual layer that can persist and provide ongoing protection against pests. This is particularly important in applications where pest control needs to be maintained over periods, as the flat spray pattern minimizes the chances of gaps in coverage.

In contrast, other nozzle types may not achieve the same level of surface coverage or could result in uneven application, which can lead to reduced efficacy of the pesticide. For instance, cone spray nozzles produce a more concentrated spray pattern that may not coat surfaces evenly, while fan spray nozzles might create a directional spray that can miss areas when used in certain orientations. Solid stream nozzles focus the spray into a narrow column, which is not suitable for the broad coverage required in residual spraying applications.