all of my hives have solid bottom boards, but I understand the concept of screened bottom boards. I use sugar rolls to count mites on occasion. I can appreciate the this is bad, vs not to bad logicelemer_fud - When you look at a bottom board and go OH s*&^! Treat again until you go hummmH? Then count as the numbers will be below 50. I was around 15-25 for most hives on the last round - just one hive up around 50-60. The counts or curve is fololwing the same time count curve as last year when I counted diligently. I believe the peak was lower - significantly, but too many Oh s*&^ to count.