dead bees, covered with dust and mites on an empty honeycomb from a beehive in decline

acarapis allergic apiculture bee beehive brood chemically closeup collapse colony copy dangerous dead death decline diseases disorder dust dysentery empty family foulbrood frame fungus genetically health honey honeybee honeycomb insecticides killed larvae mites modified neonicotinoid nosema parasite pest pesticides plagued poisonous problems reaction space swarm texture toxic treatment varroa viral