I agree with Spencer, but prefer to fog it on. It goes on so much faster.
If you don't have a fogger, just get a piece of hose about as big as a straw. Put one end in the bottle, and hold the other end right under the nozzle of your blower. It will suck it out of the bottle and fog it right on the calf. If too much is coming out, then move the hose back away from the blower nozzle a little bit.
Like Spencer said, by the time you get around the calf with the spray bottle, it is time to start rinsing where you started!