Diseases
Two disease impact honey bee populations. American foulbrood and European foulbrood both kill honey bees during the papal stage. The problem is worse in locations with high humidity. If a bee colony is affected by either, the entire colony must be killed to save nearby colonies from infection.
Pests
Several pests affect honey bee populations. Common pests include tracheal mites, varroa mites, small hive beetles and wax moths. These pests can kill bees and ruin honey. The pests are controlled by different methods including chemicals.
Pesticides
Pesticide poisoning kills many bees. Beekeppers must protect their hive from pesticides by covering them with plastic or burlap when the pesticides are being applied to nearby fields.