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New Zealand Beekeeping Forums
New Zealand Beekeeping Disease & Pests
Effectiveness of varroa treatment
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<blockquote data-quote="John B" data-source="post: 7681" data-attributes="member: 207"><p>I find Apivar to have a very quick initial knock down and have confirmed this with monitoring. It does however seem to miss a few and you still see the odd varoa in the hives for weeks after they go in . It's very important with varoa to get as close to 100% knockdown as possible and only leaving them in 10 weeks gives you close to this. I move the strips round if the brood has moved or expanded and I don't think it doesn't the harm to give them a quick change of position anyway.</p><p>A couple of weeks ago I treated a hive at home that had been deliberately left untreated for an experiment I was running. Unfortunately my idea didn't work or at least not as well as I hoped. Natural mite drop was around 100 mites per day before treatment, I put in a fresh sticky board at the same time as I treated them and it had hundreds of mites within two hours and after 48 hours the sticky board was almost black. I haven't counted it but it would have to be in the thousands.</p><p>When synthetic pyrethroids worked for me and they did for many years, six weeks was long enough to remove every mite and realistically once you put the strips in you never saw another mite . The last time I tried using them there was a small initial drop in mite numbers followed by a steady increase over the next month. And no it wasn't reinvasion as hives in the same apiary treated with apivar had zero detectable mites at the end of the treatment.</p><p>When you have treatments in you may get reinvasion but those invading mites die pretty much straight away. If you have treatments in and you still have lots of mites a month later then you either have resistance or as Alistair has said you have insufficient strips or have placed them in the wrong place.</p></blockquote><p></p>
[QUOTE="John B, post: 7681, member: 207"] I find Apivar to have a very quick initial knock down and have confirmed this with monitoring. It does however seem to miss a few and you still see the odd varoa in the hives for weeks after they go in . It's very important with varoa to get as close to 100% knockdown as possible and only leaving them in 10 weeks gives you close to this. I move the strips round if the brood has moved or expanded and I don't think it doesn't the harm to give them a quick change of position anyway. A couple of weeks ago I treated a hive at home that had been deliberately left untreated for an experiment I was running. Unfortunately my idea didn't work or at least not as well as I hoped. Natural mite drop was around 100 mites per day before treatment, I put in a fresh sticky board at the same time as I treated them and it had hundreds of mites within two hours and after 48 hours the sticky board was almost black. I haven't counted it but it would have to be in the thousands. When synthetic pyrethroids worked for me and they did for many years, six weeks was long enough to remove every mite and realistically once you put the strips in you never saw another mite . The last time I tried using them there was a small initial drop in mite numbers followed by a steady increase over the next month. And no it wasn't reinvasion as hives in the same apiary treated with apivar had zero detectable mites at the end of the treatment. When you have treatments in you may get reinvasion but those invading mites die pretty much straight away. If you have treatments in and you still have lots of mites a month later then you either have resistance or as Alistair has said you have insufficient strips or have placed them in the wrong place. [/QUOTE]
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