Spray at night when they do not fly. I find bumble bee nests that I accidentally run over while bush hogging, by stepping around at night until I hear them buzz. Then I squirt on a little pyrethroid and say goodbye to the nest. My least favorite are yellow jackets. Got 40 stings when I stumble on one when I was 8 years old. I also got some stomach stings from bumble bees when I was about 12. I have had the occasional paper wasp sting as an adult when I stumble too close to a nest that I do not see. Wasps and bees are generally beneficial, but I don't tolerate getting stung. If I was allergic, I'd find someone else to kill them off.
