My wheels are turning and I think if I can find an adhesive shelf liner that light can pass through I'll make up a frame with a light inside and wrap the paper (adhesive side out) around it and when they land on it they will get stuck. They even come at the led light on the front of my hat, thankfully they don't bite like mosquitoes yet they are almost as bad as gnats bombing the light. I remember last spring when I was outside having a smoke I could hear them crunching away.
And those asian lilly bettles got mine for years but they seemed to leave the tiger lilies alone after using a systemic insecticide (I can't remember which? I'll look; although it wouldn't suprise me if it's banned now).
The bayer tree and shrub (it's systemic) seemed to help my smaller trees but the bigger ones took a beating this spring so I'll treat them this coming spring. The neighbors who won't treat their trees and the woods around me are going to ensure I them every year and once again try to keep them outside each fall
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Heck I've even considered putting a box fan on high with a light behind it (outflow side) to see if that would work.