On the very few occasions I've felt it necessary to eliminate yellow jacket
or hornet nests, I've used a common garden sprayer with pyrethrins/rotenone
(mixed at full strength).  Set the nozzle to a medium stream, pump it well,
and spray right into the entrance in the early morning before flight (a good
sprayer will emit a stream ten feet or more).  The overwhelming amount of
pyrethrins injected into the nest asures that none fly out while spraying is
in progress.  The few that fly out afterward are dead in seconds.

I prefer pyrethrins/rotenone over synthetics because of their natural
origins (based on chrysanthamum extract, unless synthetic pyrethroids/and
cube resins), and the fact that they degrade fairly quickly - usually within
24-48 hrs.

Todd.

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