Yuck!
I dribbled oxalic acid on my bees today as it was a relatively warm day and found a build up of mould on the top of the crown board. I bought the the standard OSB Rose box, mesh floor and crown board from Thornes and started with my bees last August.
I did notice a small amount of black on the new box in about November .
Above the crown board which has glass covers on the holes is another OSB box and I had put a sack with some wood shavings in. I now have taken the sack away. The plywood side of that box was covered with black mould as well.
I know we are having a very wet year but the hive is in a sunny site with air access.
The bees are still alive.
Any comments about what I could/should do and why it happened and is it common?
Thank you
Nicky
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