I just did a mite count on a sticky board after the board was three days under the hive. I counted zero mites. I used a magnifying glass and went over the entire board carefully. Is this possible, or have I done something wrong? This is a new package started in April, and I went queenless for about a month from mid July to mid August. I've used powdered sugar several times over the summer and two or three times when they were broodless during the queenless period.
I made my own sticky board by putting double sided sticky tape (carpet tape) on cardboard and put the cardboard on the tray that slid under the screened bottom board. I used this same method in June and I counted 9 or 11 mites in 1.5 days back then. My thoughts are that maybe with cooler temperatures the mites aren't falling, the sticky tape doesn't work (although there were plenty of other things firmly stuck to the board, a few bees, bits of wax and pollen, etc.), or something else weird is happening. Any thoughts?