I use Ron Brown's method of a teaspoon of thymol in an emptied teabag
placed above the brood for warmth. I normally keep very few hives in each apiary
and, where I share a site with an apprentice, we ensure that our hives
have different orientation and appearance to minimise drifting. Mite drop has
been very low this year but has recently risen to about 1 a day.
Chris
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