Metarhizium anisopliae is a well-studied entomopathogenic fungus that widely used in biological control programs. The presence of polymycoviruses this common, but their effects on fungal development and stress tolerance are not well understood. In study, we report the discovery novel double-stranded RNA virus, named polymycovirus 1 (MaPmV1), which comprises four dsRNAs ranging from 2.4 to 1.4 k...