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Informed Discussion of Beekeeping Issues and Bee Biology

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Subject:
Re: Apistan resistance
From:
"Lipscomb, Al" <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Wed, 25 Apr 2001 16:31:17 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (16 lines)
> Al said: "There was some thoughts that it will take N generations of
> mites
> before Apistan will be useful against a mite population that
> had become resistant. Rotation would only continue the resistance."
>
> The thought is, isn't it, that those bees resistant to Apistan are
> all killed by the Coumaphos so they disappear from the gene pool
> altogether?  Dan
>

No, nothing kills all the mites. 99% is the best I have seen claimed.
Apistan kills 99% of the mites until most of the mites left were resistant.
Then the Cumaphos kills 98% of the mites, Apistan resitant and non-Apistan
resistant in about equal proportions until the population is mainly Cumaphos
resistant. This new population would still be partialy Apistan resistant.

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