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New Zealand Beekeeping Disease & Pests
Bayvarol
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<blockquote data-quote="JohnF" data-source="post: 12267" data-attributes="member: 233"><p>Yes - but its longer than a couple of seasons. Recent reports from the USA show that their varroa still harbour the resistance mutations years after stopping pyrethroid treatment. One of the reasons for this may be the sub-lethal levels of pyrethroids in the wax and frames (bee bread) that was found and that is essentially selecting for resistance.</p><p>Resistance to amitraz (apivar/apitraz) is caused by 1 of two mutations in a different gene - the receptor for amitraz.</p><p></p><p>I agree Alastair, NZ's use of commercial products - and good alternating practices - is the main reason why we have avoided widespread resistance</p></blockquote><p></p>
[QUOTE="JohnF, post: 12267, member: 233"] Yes - but its longer than a couple of seasons. Recent reports from the USA show that their varroa still harbour the resistance mutations years after stopping pyrethroid treatment. One of the reasons for this may be the sub-lethal levels of pyrethroids in the wax and frames (bee bread) that was found and that is essentially selecting for resistance. Resistance to amitraz (apivar/apitraz) is caused by 1 of two mutations in a different gene - the receptor for amitraz. I agree Alastair, NZ's use of commercial products - and good alternating practices - is the main reason why we have avoided widespread resistance [/QUOTE]
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