OMG! This is the mite drop on a colony that I started treating with Apistan 2 days ago (never used before so resistance unlikely)
The biggest shock to me though, is this colony was treated with Formic Pro on 15 Aug for 1 week as per the manufacturer guidelines. I’d completed a sugar shake the first week of Aug and it showed a 3% infection. I suspected something was not right though when mite drops continued at a relatively high rate after the Formic Pro treatment.
Either Formic Pro does not work effectively on v large colonies or they have been robbing another colony somewhere nearby. None of mine!
I suspect the Formic pro is the issue. No evidence of more honey coming into this hive than others in the same apiary. After doing some digging, Formic pro is different to Maqs - only 80% claimed effectiveness by the manufacturer and they’ve changed the outer paper on Formic pro so it’s released more gently to not kill bees or risk the queen. Wasn’t the old Maqs 90%+ effective?
I wonder if they’ve tested the ‘new product’ properly on big colonies….the formic pro after a week had no scent at all and had completely dried up.
Surely if the treatment WAS effective and the colony is robbing another, this number of mites couldn’t have hitched a ride in that short space of time? The treatment was taken off on 22 August. So only just over 2 weeks ago.
Bearing in mind Apistan only kills phoretic bees this number of mites and more, could still be in the sealed brood. V concerned now whether this colony will make it through winter as the virus loads must be v high.
What do you experienced beekeepers think, is it possible for this number of phoretic mites from a Rob-out in just 2 weeks? Plus up to 80% more in sealed brood?