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Date: | Thu, 11 Jun 2020 00:23:26 -0400 |
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Alex said: " think it's a very cheap and easy insurance
policy especially if the apiary has a history of EFB that season.
If you have EFB cases in the apiary, then you should consider treating via shook swarm and/or medication all the colonies in the apiary as the research shows EFB levels increase with proximity to infected colonies, presumably via drift.
Randy is entirely correct that in the absence of a case of EFB, medicating only drives the conditions for resistance.
I have to say though, it took all the self discipline I could muster this year to NOT treat prophylactically, In the end I decided I had to know if there was still an infective source around, so I let the colonies be. I put robbing screens on about 1/3 of them to see if EFB struck colonies lacking that protection. But no meds. It was not an easy decision, given my EFB-PTSD!
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