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Subject:	Re: miticide resistance not chiseled in stone?
From:	randy oliver <[log in to unmask]>
Reply To:	Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:	Tue, 26 Jan 2010 08:40:16 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (22 lines)

>So one could surmise that a miticide's effectiveness for varroa control
isn't chiseled in stone.

Kirk, miticide resistance generally comes at a cost to the mite, and gives
resistant mites a "fitness" advantage only so long as the miticide is a
major cause of mite mortality.

In the case of fluvalinate, it has been clearly demonstrated in Europe that
resistant mites reproduce at a lower rate than non-resistant mites, and are
simply outcompeted by non-resistant mites within a few years after the
miticide pressure is removed.

Randy Oliver

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