We have also been fighting Japanese Hornets this year in central Virginia and have wasted losts of money on commercial products. None have worked very well. What has worked fairly well is empty water bottles filled about 1/3 full with sugar water and hung from a tree or post. The more you put out the better. A fairly strong mixture of 1 part sugar and 1 part water works pretty well. They go in the bottle and most can't figure out how to get out and eventually drown. Every now and then you will get one that does get back out, but not very many are that smart. These suckers around here are big, and aggressive. If you get stung it can be deadly. Good luck.
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