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Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Sat, 6 Sep 2003 11:28:01 -0400
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Bob Said:

> Use of ALV at average daily temperatures below 54 F. may result in less
> control of varroa.
>
>

I checked our local weather history, and the cutoff for 54f avg daily temps
is around Oct 10 in my area.  Working backward 33 days (minimum treatment
period, 42-56 days recommended), I'd have to treat around 9/8 for reasonably
effective treatment.  This would significantly cut into our goldenrod/aster
flow, which continues pretty solid until Oct.  It also appears (based on
Swiss research results) that efficacy drops considerably in two story
hives - from 97% down to as low as 74%.  Premature cool weather (a real
possibility in Vermont) could reduce these numbers even further.

Derek mentioned that he treats in July, after harvest.   That would not seem
practical here in the Northeast U.S., where a major portion of the honey
crop is goldenrod.

Has anyone in the Northeast U.S. tried thymol treatments?  If so, when did
you treat?  Any problems?

Regards,

Todd.

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