So how can we find the culprits behind this disaster?

So, how can we find the culprit behind this calamity?Here are three of the possible offenders.Exhibit A: Pests and Disease.Most infamous is the varroa mite,a minuscule red pest that not only invades colonies and feeds on bees,but also transfers pathogens that stunt bee growth and shortens their life span.Exhibit B: Genetics.The queen is the core of a healthy hive.But nowadays, the millions of queen bees distributed in commercial hives are bred from just a few original queens,which raises the worry about a lack of genetic diversity which could weaken bees' defenses against pathogens and pests.