I have a split that I made three weeks ago. Starting out fine. Queen is laying eggs, first round of brood hatching out. Things look slow but ok.
But on about 10% of the bees is what looks like some white dusting or spots on their backs. Some of them it looks a bit like a patch. I've been keeping 10 +/- colonies for many years and I have never seen this. No dead bees, no other indicators of any problems.
Any one seen this before!?