Some help on what has happened here

[CaptainCymru]

Morning folks

Just had a quick nose at my hives after securing for the winter and they have been wiped out. I treated for Varroa in late September using oxalic acid in the gas vap, 3 treatments 7 days apart. Checked for stores and placed fondant on crown board. One of my hives is totally empty and the other has one frame of bees and a queen . Both hives have lots of honey . They were on double brood national . My thoughts are that they became honeybound with a late flow and swarmed into nothing however I have a brood pattern I would like you to look at . I have ordered a AFB and EFB kit to make sure . Is honey safe to eat from EFB and AFB ? I understand I have to burn the frames and scorch the boxes if it is . Some help would be good .

 

[mbc]

Morning folks

Just had a quick nose at my hives after securing for the winter and they have been wiped out. I treated for Varroa in late September using oxalic acid in the gas vap, 3 treatments 7 days apart. Checked for stores and placed fondant on crown board. One of my hives is totally empty and the other has one frame of bees and a queen . Both hives have lots of honey . They were on double brood national . My thoughts are that they became honeybound with a late flow and swarmed into nothing however I have a brood pattern I would like you to look at . I have ordered a AFB and EFB kit to make sure . Is honey safe to eat from EFB and AFB ? I understand I have to burn the frames and scorch the boxes if it is . Some help would be good .

It doesn't look like foul brood to me, looks more like a virus epidemic, those hatching bees with their tongues poking out is the classic look of varroa collapse.
Maybe too little too late with treatment or domino effect of other collapsing colonies in the area.

 

[jenkinsbrynmair]

looks more like a virus epidemic, those hatching bees with their tongues poking out is the classic look of varroa collapse.

foulbrood doesn't affect a colony like that anyway, but there are obvious signs of varoosis.
Vaping every seven days is too far apart and hardly going to put a dent into a colony if it is already under a heavy mite burden - what was the colony's history throughout the year?

 

[CaptainCymru]

It was a new nuc installed in May from a reputable dealer , did a walkaway split in July , both hives very strong in September .

 

[robmort]

When you did the Varroa treatment did you monitor the drop?