- Nov 3, 2021
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Its a shame that I didnt know better when I chose Apistan to rid my new nuc of mites - I believe that although it dropped a significant number of mites in the 6 weeks - it didnt do a good enough job and the infestation grew over the summer to make the next treatment only partially effective.Just as my late addition to the thread. As per Hemo, the mites had likely been made resistant to apistan by the vendor - who is clearly an idiot IMO, to say the least. Needs naming!
On top of that, Apistan is renowned for inefficiency if not applied in optimum conditions (do they still quote efficacies from non-UK tests, like they used to?). Spain and/or Italy IIRC.
That likely accounts for your (expensive) travails, trying to rid them of the pest.
Oxalic acid sublimation would/should have dropped virtually all the mites in the swarmed colony if they were treated before any new brood was capped. Remember that for the future. Likely, too, that the queen was an older one, as well.
You have done well not to lose your colony/colonies since starting. Please go into winter with the minimum of space beside and above your colonies, no holes left open in the crownboards, 50mm (ideally) of effective insulation above the crownboard, mousegards in place and (if well stocked with stores at present) check for adequate stores when brooding starts in the spring.
Not a lot more you can do for them (yes, the extra solstice vape may be good, but should not change their survival chances unless heavily infested at present). Winter bees will likely (unfortunately) already be infected by these residual mites while they were still pupating, so nothing can be done about that.
Good luck with over-wintering all three successfully. There may well be a carpet of dead bees on the hive floors, in the spring, and the colonies weak, but hopefully still strong enough to build up in the spring.
Name that vendor! Or other newbies may well suffer a worse fate than you have done!
I didnt know about OA sublimation when they swarmed - (only 4 weeks after collecting the nuc) so after recapturing it, I just gave the swarm the remaining 2 weeks of Apivar. - If only I had my sublimox then.
I know the vendor supplied a nuc with lots of varroa and some DWV , however, they did tell me and made me promise to treat straight away - if I had known then what I know now I feel sure I could have resolved this issue much earlier.
The hives were set up for winter a couple of weeks ago.
All three WBC hives have all 10 frames full and fondant above the crownboard which is surrounded by insulation and a super of insulation on top of that (150mm)
They have open mesh floors and mouseguards - the inspection boards are still in till I finish checking on varroa drop for the next few days.
The hives are well shielded from the wind. Varroa count - 2 hives are down to 1 a day and the other is still at 30 a day - last and final sublimox vape was 2 days ago.
I am still thinking I will vape one more time end of December.
Thanks for all the advise and support everybody - much appreciated.