I'm looking to make some screened bottom boards and want to know the proper screen size.
However, I do not want the screen holes large enough that the SHB can get through them.
My current commerically produced bottom boards appear to be 1/8" mesh and allow the SHB to enter through the screen. Obviously the larger beetles can not, but I've watched quite a few avoid the bees by dancing on the bottom of the screen.
I have some window screen that is 1/16" or so. Will Varroa pass through this?