New article out today on how different color pan traps can be better or worse for capturing different Hymenoptera species and surveying insect biodiversity.
The overall finding is that yellow pan traps get more species and individuals, but certain species show fidelity to other colors and are unlikely to show up if you only sample with yellow pan traps.
It looks most pronounced in the bees (Anthophila) compared to other taxa, but it looks like to get a full picture of especially pollinator diversity, adding blue, fluorescent blue, and white can help get a better sense of true pollinator diversity.
Pan traps are pretty easy to make, just colored plastic party bowls filled with water and a drop of dish soap. I’ve used them before to get specimens for my collection and to post on iNaturalist, but I’ve only used yellow bowls. Have you used other colors? Have you seen any differences?