What type of sprayer would be appropriate to treat an oak tree in a backyard if using a wettable powder formulation?

When treating an oak tree with a wettable powder formulation, a high pressure spray is particularly effective because it can adequately disperse the powder and ensure that it mixes well with water to create a suitable solution for application. High pressure sprayers are designed to atomize the liquid, allowing for better coverage of the foliage and allowing the active ingredients to penetrate the plant's surface more effectively.

Wettable powders require sufficient agitation and pressure during application to prevent settling at the bottom of the tank and to achieve an even distribution on the target surface. This is especially important when dealing with larger plants such as trees, where thorough coverage is necessary to ensure pest control.

In contrast, other types of sprayers may not provide the necessary pressure or coverage needed for effectively applying wettable powder formulations on a tree. While low pressure spray may not deliver the product sufficiently over the leaves, hand-operated sprays could lack the reach and coverage for larger trees. An ultra low volume (ULV) sprayer would be unsuitable as it is designed for very low volumes of liquid, which is not ideal for wettable powders that require a more substantial liquid solution for activation and dispersion.