Piles of dead bees under hives

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Ant powder will be lethal to bees too - if you’re using it around the hives and the bees are coming into contact with it, or water that has been in contact with the powder, that may be why you have piles of dead bees.
I considered that too. I used it once and the ants are still there. Its definitely CBPV and has been going on for weeks.
Thanks for the replies. I've removed the floors. The queens in each of the infected hives are still laying strongly with 5 or more frames of brood so I'm hoping that they'll recover soon, and not sure if requeening will help.
You will get a range of opinions as hard scientific evidence as how to best manage cbpv is absent as far as I can see.
My opinion; if its really bad and not showing signs of improving consider euthanising sooner rather than later -otherwise you waste a lot of time and effort and still end up with a dead colony.
Ive done that this year to the original colony that went down with cbpv and was much more severe than the other other colonies that have subsequently been infected and now seem to be recovering - having requeened themselves whilst suffering on-going cbpv.
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The CBPV still looks really bad as 100's of bees are dying every day in each hive, but maybe not as bad as it was. There are still plenty of bees filling the brood box and plenty of brood. They are not collecting much nectar but that may be the weather despite plenty of bramble flowers. This is why I doubt if requeening will help.
This is why I doubt if requeening will help.
at this stage I doubt it too - get them over an open floor, wait until the die-offs stop and they seem to be recovering (or at least not getting any worse) then consider requeening, but sometimes you will find they will do it themselves - I had one like that a few years ago, they requeened and the following spring they were off like a shot and were one of the first colonies I had to Demaree as they were building up so strongly. That particular queen is still in there and this year again is laying like a train and under a Demaree as I type.
One of my colonies had it last year. It was severe. Dealt with it in the same way as EFB plus scorched the ground the hive stood on and haven't used that spot since. It's an insect based disease, not just bees.
I would recommend that to watch this presentation. by Prof Giles Budge of Newcastle Uni. One of my hives had CBPV about 5 years ago. The standard NBU advise then was to shake out the bees 10m away for the healthy one to return to the hive. This doesn't work as the bees have the virus and show as healthy before symptoms emerge. The advice was to re-queen, there is no evidence that this as works. The virus is transmitted through contact and the dead bees carry the virus. I removed the floor and made Correx trays to lay on the ground under and in front of the hive to catch the dead and dying bees. I cleared these twice a day. I added two more boxes to the hive to reduce crowding. In 7 days the number of dead bees was minimal and after that the hive recovered to produce a very good crop. The extra space added did cause a bit of chaos with comb build randomly but fairly easy to sort out.
Its a good talk, concise and objective.
I've removed the floors, added ekes and cleared dead bees. Maybe it's improving already but too early to be sure.
ant powder I sprinkled around the hive legs
ants are no problem to the bees
Agree with JBM: the nuc below had been attacked in winter by green woodpeckers in three places; the roof holes were enough for the ants to burrow in, but the bees and ants lived separately.

If ants get into the bee zone it's a different story, and I've come across a demoralised nest in one corner and ants romping around in the other.

light sprinkling of cinnamon powder
I understand that cinnamon is eventually fed to the queen, which dies as a result. As bees, ants, and wasps are all beneficial social insects, let's treat them with equal respect.

This strong nuc was upgraded and the ants relocated.

View attachment VID_20240603_162106664~2.mp4

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