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From:
Peter Loring Borst <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Wed, 26 Oct 2016 07:46:26 -0400
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> The work you site is from 2000 (roughly)

It was from 2007, but never mind. Is this recent enough for you?

Kefuss, J., Vanpoucke, J., Bolt, M., & Kefuss, C. (2016). Selection for resistance to Varroa destructor under commercial beekeeping conditions*. Journal of Apicultural Research, 1-15.

A survival field test was initiated in 1999 to observe the effects of no treatment against Varroa destructor on European
honey bee colony survival. After losses of over two-thirds of the 268 original colonies, new colonies were made from
the survivors. In 2002, genetic material from these survivors was bred into an independent group of 60 colonies. In
2013, 519 non-treated colonies from both groups were being used for commercial beekeeping, and mite populations
were very low. This indicates that under commercial beekeeping conditions, simple methods can be used to select for
reduced mite populations.

It is clear that mechanisms of resistance and tolerance
(whatever they are) may require years to be
expressed before they can be utilized for selection.
Chemical mite control masks and destroys natural selection
for these mechanisms. Short-term experiments lasting
only a few months can lead to erroneous conclusions.

There are clear reasons why beekeepers should
select for mite resistance and why chemicals should not
be used in mite control. Chemicals used to treat against
mites have been clearly found to impact colony health,
immunity, and potentiate the effects of insecticides;

We believe that it is the responsibility
of everyone who breeds bees to try to select for mite
resistance to reduce chemicals in hives. We owe this
effort to the general public and to future generations of
beekeepers.

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