I have a piece of 1x6 tongue-and-groove lumber. I chamfered the groove slightly to open it up a little, and installed a little stop-block at one end. I clamp this horizontally in a bench vise, lay the rod in the groove with one end against the stop-block, and get after it with a low angle block plane. The end result is a nicely tapered rod and about half a bushel of curly shavings which are great for fire starting, but no carcinogenic wood dust floating in the air that requires you to wear a mask and it doesn't require any electricity.
This does take some time, but what's time to a piece of wood? Seriously, if I made my living doing this sort of thing, I would look for a more efficient way to accomplish it, but I'm just a hobbyist, and I enjoy working with hand tools.
One other thing I do is to use a pencil to mark circumferential lines around the rod at spaced intervals. At the tapered ends of the rod, the spacings are closer together. I push the plane and shave off the most distant pencil ring, rotating the rod before each pass. When I've gone all the way around the rod, I re-mark that ring with the pencil, then shave off the two most distant rings. I re-mark then, then shave off the three most distant rings, and so on until I've gotten the rod to the dimension and taper I want. This technique helps achieve uniform stock removal around the rod, and a smooth, even taper. It is a little complicated to describe, but the process is simple.
Best regards,
Notchy Bob