24 hours after a powder sugar dusting there are 90 varroa mites stuck on the bottom board. This is the most I have seen, but my experience is not deep. I presume the mites on the bottom board are only a small percentage of the mature mites in the hive.
I understand the mite population peaks in the August-September time in my area, but is this mite count a concern?
I wil dust and measure again in a couple of days.
The count really does not matter this week. I would worry about the next 2 to make sure you are knocking the mites out. Let us know about next weeks count to see how low it is.