Which of the following is an example of above-ground application equipment?

The correct answer is the sub-slab injector, as this piece of equipment is specifically designed for applications made through cracks or openings in slabs and is used to deliver termiticides below the surface, effectively targeting areas where termites may enter a structure.

This type of application is especially relevant in locations where termites are known to travel within or under concrete slabs. It directly addresses the challenge of subterranean termite control by allowing for deep penetration of pesticides to create a barrier against termite movement.

The other options, while all useful in pest control, serve different purposes. For instance, a soil injector is primarily utilized for below-ground treatments directly into the soil rather than targeting above-ground structures. A soil drench sprayer is designed for applying insecticides to soil surfaces and is also more focused on the ground level. Termite bait stations are strategically placed above ground to intercept termites as they forage but do not actually apply termiticides in the same manner as the sub-slab injector, which directly impacts the areas where termites are likely to access the home.