Ascosphaera apis is a species of fungus belonging to the family Ascosphaeraceae.

[1] It was one of the first entomopathogen genomes to be sequenced.

[2] It has a cosmopolitan distribution.

[3] It causes the chalkbrood diseases in bees, which rarely kills infected colonies but can weaken them and lead to reduced honey yields[4] and susceptibility to other pests and diseases.

[5]