You've had some good suggestions; Demand, Tempo, Talstar, Delta Dust,
etc. will all work, but they have limited to no "knock down" effect on
hornets. I never heard the plastic jug/glass bowl technique, but it
sounds like it could work.
The colonies seem rather slow to react to any alarms, at night, IME.
A squirt of hornet "freeze" will kill the sentrys, and I've never seen
more than 3.
This is the time of year hornets are producing new queens which will
overwinter and ensure the survival or the colony, so they tend to be
I had one client dig up a nest with a backhoe. He "said" it was
4'x6'x8' deep, but it was all filled in when I saw it.
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