Ascosphaera apis
fungus
Quick Summary
Ascosphaera apis is a fungus that causes chalkbrood, a fatal disease affecting developing honeybee larvae. Infected larvae develop a white, woolly growth and eventually harden into a chalky white to grayish-black mass. This disease is one of several that can impact honeybee colonies, alongside bacterial infections like American foulbrood and viral diseases like sacbrood.12
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