[Opto55]

I lost both my hives this year in Alberta. Bad winter with warm temperatures in January and extreme cold in February. I am assuming condensation was the cause? When I opened them up there appeared to be a blue/ green mold on them. What do you think? I have talked to a few other beeks and they have had heavy losses as well.
Thank you.
Barry

 

[Michael Bush]

> What do you think?

I would be careful not to jump to conclusions. Look for evidence.

http://bushfarms.com/beesfaqs.htm#Why did my bees die?

 

[dkofoed]

They'll tend to grow mold once the colony dies and there's no longer any warmth in the hive to move the moisture around. There are a number of reasons why colonies die, but it's typically not because of cold weather.