 Instead, pick a fungicide that controls the target disease. In this case, that would be something like Endura, Viatud, or maybe a combination of Domark and Topsin. Next on our list is spray coverage. Fungicides move in the xylem of the plant, which only moves up. If you don't spray the lower leaves or even the lower halves of leaves, those parts of the crop will be unprotected. Also, when new leaves emerge, those are unprotected as well.