> Colonies heavily parasitized by  varroa, tracheal mite, viruses, or nosema do not behave normally, and may not cluster well in the winter.

We saw a lot of this last year, where the bees seemed to die in odd places in the hive, like in the corners of the space between the inner and outer cover. (Those who use migratory lids may not know of this space, it's like an attic). 

PLB

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