Hi Lloyd,
 
I agree with what you're saying but Tony is talking about Bayvarol in
the UK. It's different from Apistan and the kill profile is not quite
the same. I don't have the Bayer figures but I'm pretty sure the % mite
drop is slower than for Apistan.
 
In message <[log in to unmask]>, Lloyd Spear
<[log in to unmask]> writes
>Tony Bloor asked about mites and strips.
>
>My understanding from a lecture just last week by Dr. Nick Calderone of
>Cornell, is that approximately 50% of the adult mites will be killed in the
>first 48 hours by the strips.  The remainder will be killed over the next
>several days, but the percentage is difficult to determine as the kill will
>also include those emerging from cells.
>Yes, your mite infestation is very low.
>I have not heard of mite resistance in the UK.  That doesn't mean it is not
>there.  If you leave the strips in for the recommended length of time you
>will get a 99% kill, if you do not have resistance.  It is not 100% only
>because some mites seem to escape the fluvalinate.  Unless resistance is
>present, even those 1% would be killed upon exposure.  However, at the end
>of the 6-8 week time, the amount of chemical on the strips is very low.
>Keeping them in the hive beyond then will eventually lead to resistant mites
>as the chemical load on the strips is not enough to kill them, allowing them
>to build a tolerance.
>I hope this helps.
 
--
Dr Max Watkins