When to treat?
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This is a legacy post that remains as valid now as the date it was first published. However, the formatting suffered slightly during the move to the new website and is a bit untidy in places. The links are regularly validated and the post is scheduled for updating … er, soon(ish) 😉.
This post is now over a decade old. Whilst the advice remains valid, the arguments in favour of the timing of treatment are explained in more detail in Rational Varroa Control, with the consequences of not getting the timing (or choice of treatment) right in Irrational Varroa Control.