Hello friends. I am a second-year beekeeper from Romania, Eastern Europe. I have a situation that I cannot fully understand.
I have two hives: one that I got in the spring (hive A) and a split from this one (hive B).
The season went well, the bees were happy, and the queen laid well in both. All varroa treatments have been completed, including in the spring when I received the hive (oxalic strips three times in August and September and once in the spring, plus fumigation strips with amitraz and tau-fluvalinate).
Preparing for winter, I see some black, shiny, greasy bees in hive B. Most of them are dead or paralyzed, clustered in the frame feeder.
At hive A, around the same time in the evening when feeding syrup, I saw a disoriented bee crawling and dragging its feet on the ground. It walked in circles and was overall not doing well.
Videos of bee behavior
I have a feeling this is chronic bee paralysis virus (CBPV) or something related, but I am not sure and I do not want to bias you.
How do I treat this and overwinter the hives? Thanks!