What kind of symbiosis is mites and bees?

SymbiOSis implies that both parties gain something from the association. This is not the case here.

There are two varieties of mite of concern to beekeepers: varroa and tropilaelaps. In both cases the relationship is a purely parasitic one with the mites feeding off the bees. The result is that the bees become weakened, fall prey to diseases or simply die.