American Foulbrood

The most serious disease a hive can have

Spore forming

The vegetative stage infects larvae

It grows for about ten days and then turns into a spore

2.5 billion spores can exist in one (AFB) scale

It takes only about 10 spores fed to a one day old larvae for it to become infected 


            Irregular brood pattern (shotgun appearance)

Many cells are left open among capped brood

Perforated, sunken, sometimes greasy looking wet capped cells

Foul odor

Discolored larvae