I'd say that in the next few years drones are going to take the place on a pretty high % of aerial applications.    From what I've seen, they do as good or better job than a fixed wing aircraft applying fungicide on tasseled corn.


I don't see drones replacing what can be done with a ground rig unless it becomes completely autonomous.    Even at that, the investment vs productivity might be hard to get the economics to work vs a ground rig.