Which type of treatment should be performed using a coarse fine pin-stream tip?

The treatment that should be performed using a coarse fine pin-stream tip is a crack and crevice treatment. This method is specifically designed to apply insecticides in tight or narrow spaces where pests are likely to reside or travel. The use of a coarse fine pin-stream tip allows for a more targeted application, minimizing drift and ensuring that the pesticide reaches the intended areas effectively. This is crucial when dealing with pests like ants, cockroaches, and termites, which often hide in cracks and crevices.

The other treatment types would typically utilize different application methods. For example, a surface spray treatment requires a broader spray pattern for even coverage over larger areas, whereas a general broadcast treatment involves applying pesticides over a wide surface area without the need for precision targeting. Soil injection treatment, on the other hand, is meant for delivering insecticides directly into the soil, often utilizing larger holes or injection points, rather than the fine approach required for crack and crevice applications. Thus, the coarse fine pin-stream tip is ideal for crack and crevice treatments due to its precision and effectiveness in those confined spaces.