Verroa control
verroa prefers drone cells - (the larger cells) often found at the bottom/lower ends of frames. It helps therefore to open a few (using verroa fork) drone cells to inspect numbers of the mite.
One way of Verroa control is to put a frame of drone foundation and this encourage...
the odd dead larva will be cleaned up before it turns to chalk brood. If there are too many it idicates the bees are not able to keep pace with the numbers and signs that the spores have spread. Depends on whether this is restricted to one frame or more - if in doubt destroy frame - best to get...