Hollow cone nozzles are commonly used for treating what type of surfaces?

Hollow cone nozzles are designed to produce a spray that forms a hollow cone shape, which allows for effective coverage of irregular surfaces. These nozzles create a finely atomized spray that can penetrate and adhere to uneven surfaces, such as those found in landscaping, textured building exteriors, or areas with dense foliage.

The unique spray pattern of hollow cone nozzles helps to ensure that pesticide or treatment solutions reach into crevices, around obstacles, and onto intricate surfaces where uniform coverage is essential. This capability is crucial in pest control applications, as pests often inhabit areas that are not flat or smooth, and targeting these locations effectively is vital for successful pest management.

In contrast, the other options may not fully utilize the advantages of hollow cone nozzles, as flat, even, or smooth surfaces typically allow for different types of spray patterns, such as solid or flat fan nozzles, which are better suited for those conditions. Therefore, the hollow cone nozzle's design makes it particularly effective for treating uneven surfaces.