It is pretty hard to eliminate food for a yellow jacket. They eat
bugs.
Boric acid is poison but I agree it is safer than most. Usually you
use it in baits. That is certainly the best way to control ants.
What do you do about termites food source. Your house is built from
termite food. A little bit of Chlordane around the foundation will save
the homeowners a tremendous amount of money in the future.
Termites don't come from around the foundation. They are blind and tunnel
around. When they hit food (wood), they keep eating. What you need to do is
bait traps (wood) around the house. You also need to inspect under the house
on a regular basis and possibly bait traps under there as well.