SC and MBush, thank for posting the pictures. The results are amazing, one pleasurable with trapped beetles, the other depressing with so many dead trapped bees. But the pictures represent a much larger delimia, one that confuses beeks to this day:
That is: what works beautiful for one fella, fails for another, both applying correct applicable measures. These results causes much confusion among beekeepers. I am a firm believer what works for you is great but may or may not work for another beek: environment, type of bee, weather, housing are all variables that can create frustrations when tackling issues such as beetles. Use what works for you, I use fingers, hive tools, freeze spray, screened bottom boards {sbb}with diatonic earth, beetle blasters. Sometimes I bait the sbb with a small chunk of grease/pollen surrounded by diatomaceous earth.
Thank you SC and Bush for the photos.