What are they besides a test for them?
Deformed Wing Virus (DWV), slow build up, in case of a dead out look for urine crystals in the cells.
Oxalic acid treatments!
Thanks. I will look for the crystals in my dead hive tomorrow. I am probably going to buy new frames just to be safe though.
Open drone brood if you have any and look for mites.
Read this - it described my deadouts last year to a T.
https://beeinformed.org/2016/03/08/why-did-my-honey-bees-die/
TJC, That's the link I had in mind when I posted. Good info.