Summary M etarhizium robertsii has been used as a model to study fungal pathogenesis in insects, and its pathogenicity has many parallels with plant and mammal pathogenic fungi. MAPK (Mitogen‐activated protein kinase) cascades play pivotal roles in cellular regulation in fungi, but their functions have not been characterized in M . robertsii . In this study, we identified the full complement of MAPK cascade components in M . r...