We had an unusually cold winter here. My beekeeper wonders if they just didn't have enough food for the winter. I've been studying it a little more and I think he should have been feeding them in the fall since they were new swarms. He brought them here in late summer. They were swarming at a business, and whenever someone locally has a bee "problem", they call him, and he brings them to my yard. He says other beekeepers are reporting 50% losses this winter. We don't know how to tell if it's cold or chemicals or the bee disease. (forget the name?)