We've had really mild weather for the last few days - temps in the fifties, bees flying. I have one hive that went into winter in a single deep (At the time I had nothing else to combine it with). It's still alive, having eaten its way to the top of the single deep and then feasted on the dry sugar and a jar of honey I put up there.
However - I noticed brown streaks on the front of the hive, and inside on the top bars. There are bees flying, they have a patch of small brood. We had about five weeks straight where the bees couldn't break cluster at all but I suspect that's not too bad since other people have months of sub freezing weather.
So, I read that the brown streaks could be nosema or tracheal mites. Should I treat? Will it do any good at this crucial time of year? When you see the streaks is the damage already done? Mild weather continues - we'll have everything budded out in a week or so, dandelions are coming up but not open. Seems like they are just on the verge of making it through winter.