What type of sprayer is commonly used to apply treatments to large trees and shrubs?

The choice of a hydraulic sprayer for applying treatments to large trees and shrubs is appropriate due to its ability to deliver chemicals efficiently over significant distances and heights. Hydraulic sprayers utilize a pump system that generates high pressure, allowing the spray to reach the upper portions of tall trees and dense shrubs effectively. This type of equipment can also be adjusted to cover larger areas quickly, ensuring thorough application of the pesticide or treatment.

Other options listed do not pertain to the type of equipment used for spraying. Insect growth regulators, horticultural oils, and insecticides refer to specific types of pest management products rather than the application equipment itself. While these products can certainly be applied using a hydraulic sprayer, they do not represent a sprayer type. This distinction is essential for understanding how the choice of equipment impacts the efficacy and reach of tree and shrub treatments.