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Discussion Starter · #1 ·
I have 1 colony that's been queenless since August. I donated a frame of eggs on 8/11, and I observed 2 smallish capped queen cells on 8/23, but on 9/13 the queen cells were still capped, so they must have been non-viable.

So I donated another frame of eggs to them on 9/13. Yesterday, 10/4, there was a very large capped queen cell on that frame, but's been 21 days since the donation, so the queen certainly should have emerged by now. I didn't see any hatched out queen cells, nor did I see a queen running around.

What reasons would there be for a colony to be unable to raise a viable queen?
 

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Discussion Starter · #4 ·
Look up BQCV. Black queen cell virus. I had a number of duds in a batch of grafts that fit some of the symptoms.
I'm pretty sure the two queen larvae that I pulled out in September were not black, but I'm not 100% sure, and I didn't take photos. If this queen cell is still capped when I check next week I'll be sure to take a photo. Thanks!
 
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