Re: Asian Giant Hornet
If the life cycle is like other wasps (like yellowjackets), only the queen overwinters, then builds a nest in spring. That means she has to forage to feed the first young, then she doesn't leave the nest. So very early spring is the time to set out bait stations.
I killed over 30 yellowjacket queens like this two years ago. I saw 2 yellowjackets this past year, so I'll do it again. Most of the queens drowned in pollen-patty remnants tossed into a bucket of standing rain-water.
"The amazing thing about the honey bee is not that she works, but that she works for others." St. John Chrysostom