What about Bayvarol? (flumethrin).

From Wikipedia (has a good reference list):
On treatment with fluvalinate, varroa develops a cross-resistance with all
pyrethoids (such as flumethrin, amitraz and acrinathrin).

But it did not seem true here.  We had fluvalinate resistance but amitraz
works (up to now, anyway).  So, I am wondering about flumethrin.

By the way, has Amitraz ever been registered in the US, or is the
resistance there all from illicit use?

Stan

On Thu, Oct 4, 2012 at 2:29 AM, Juanse Barros <[log in to unmask]> wrote:

> Amitraz efficacy lasted for around 5 years at Chile, now it doesn't work.
> It is one of the probable causes of the high mortality of this past winter.
>
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