If you go on line to Bee Base you might be able to find the page that lets you enter mite drop, date etc and tells you when next you should treat. I did so a couple of days ago reporting an average daily drop of 1 mite and was told that I don't need to treat for (if memory serves) 7 months, however I might give them a Christmas present of an Oxalic dribble or vapour.
Chris
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