Without healthy bees we would not be here, much of the interest in beekeeping in the last few years has arisen through the national and international reporting of Bee Colony losses.
It is often said that the biggest killer of bees is the beekeeper, through neglect, spreading infection and general interference.
Varroa control is a key driver to maintaining healthy colonies, the Varroa Control page is an excellent reference point for information in managing varroa.
DEFRA has produced a comprehensive set of fact sheets and booklets on all aspects of healthy colony management, these documents can be found here.