Catch a spring swarm generally the only way to increase your Japanese honey bee colonies . Hive splitting, requeening are just something you just really won’t hear Japanese beeks talking about.
For the past four years I have been using the yellow margin orchid which releases 3-Hydroxyoctanoic acid to signal Japanese honey bees. I honestly have know idea why it does this, or what benefits the orchid gets and getting the orchid to flower when I want it to is always a major headache. With my painkillers running low I have decided to purchase artificial traps this year and see how they work.