What bacterium causes American foul brood in honey bees?

The causative agent of American foul brood in honey bees is a bacterium known as Paenibacillus larvae. This bacterium is a rod-shaped, spore-forming organism that infects the larvae of honey bees, leading to a characteristic disease that is devastating to bee colonies. When bees ingest the spores, they can become infected, and the disease primarily affects the developing larvae, which can result in significant mortality within the hive.

American foul brood is particularly concerning due to its highly infectious nature and the resilience of the spores, which can survive for years in contaminated equipment or combs. The disease can lead to the collapse of honey bee populations, making knowledge of its causative agent crucial for beekeepers in order to implement appropriate management and control measures. Understanding that Paenibacillus larvae is the bacteria responsible helps beekeepers recognize symptoms and take action to mitigate the risk of outbreaks.