Re: Experience with Apiguard.
In previous years I've had similar experiences with ApiGuard. I've also seen queen supercedures that appeared to be triggered by its application during periods of elevated temperatures. I now use half a dose, with applications spaced one week apart and it seems less disruptive.
From the manufacturer's website:
At temperatures above 25ºC (77ºF) it is possible to use a half-dose of Apiguard and get a very good mite kill. Use 2 doses of 25g Apiguard, one week apart instead of 2 x 50g at two weeks apart. A third 25g dose is sometimes used after the second week where mite infestations are high.
When it is very hot, the thymol sublimes faster from the gel and the bees are more active moving the Apiguard around. Both these factors increase the effectiveness of the treatment and less product is needed. Make sure the hive entrance is not restricted, allowing thymol vapour to escape.
Let me never fall into the vulgar mistake of dreaming that I am persecuted whenever I am contradicted. - Emerson