Microbial symbionts of honeybees: a promising tool to improve honeybee health.

Highlights: [•] Different biotic and abiotic stressors are affecting honeybees and large losses have been reported worldwide impacting economically agriculture. [•] Microbial symbionts are emerging as modulators of the innate immune system and, more in general, of the insect health. [•] Because of their crucial involvement in insect physiology, microbial symbionts could represent a powerful tool to preserve and improve insect health through the application of Microbial Resource Management (MRM) concept. [ABSTRACT FROM AUTHOR]