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Date: | Mon, 8 Jul 1996 16:55:50 +0200 |
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Regarding leaving Apistan in colonies over the winter; if you can
possibly avoid doing it, don't do it. It won't give you any more
protection than treating in late autumn and/or in early spring and it
will increase the risk of selection for tau-fluvalinate resistant
strains of Varroa mite.
I'm not saying you WILL select but the risks are higher if you've
already exposed mites to the pesticide earlier in the season and then
you extend the treatment for a further 3-4 months later on. Treatment
should be 4-6 weeks only and should be performed at a maximum twice
per year, each treatment several months apart.
I know it's difficult sometimes to time withdrawal of the strips
before a cold spell hits but it's to your and to all your beekeeping
neighbours' benefit if you can do this.
If you really can't avoid the strips being in the hive over winter,
take them out as soon as you can in the spring and don't treat again
with Apistan until late summer/autumn. If the colony becomes very
highly reinfested in the meantime you should try using another type of
intermediary treatment, maybe such as formic acid, if available.
As Technical Development Manager for Sandoz I've seen first hand how
resistance can develop by submitting Varroa to all-year-round hive
treatments in Italy - admittedly with uncontrolled dosage of illegal
preparations such as Mavrik and other, different actives - but the
result is potentially the same - resistant mites.
ANY preparation (including natural products) which is efficaceous can
lead to selection of resistance in its target species if the exposure
is not controlled. In the case of Varroa treatments, Apistan is a very
good tool but a tool is only effective if used skillfully.
Beekeepers have the power to control Varroa resistance and the
[long-term] effectiveness of Apistan - or of any other hive treatment
product - by using the product wisely and to follow the label
directions as closely as practicable. Accepting that it's not always
possible to follow label directions to the letter, it's probably the
best guide you can get.
Hope this helps.
Max
______________________________ Reply Separator _________________________________
Subject: Apistan
Author: [log in to unmask] at INTERNET1
Date: 02/07/96 00:50
Thanks for the many replies to my earlier inquiry regarding Mite Control using
the new MITE SOLUTION. Apistan wins hands down. Now one more question
please. What are the effects, if any, if the Apistan strip is left in over the
winter, say from October 1 to May 1? Make it easy on Bee-L and rsvp direct to
[log in to unmask] Thanks a million-no make that 2 million. 73s.
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