majus Metarhizium majus[1] is the name given to a group of fungal isolates that are known to be virulent against Scarabaeidae, a family of beetles.

Previously, this species has had variety status in Metarhizium anisopliae (var.

majus) and its name is derived from characteristically very large spores (typically 2.5–4 μm x 10–14 μm long) for the genus Metarhizium.

There has been considerable interest in developing isolates of this species into mycoinsecticides: especially against the coconut and oil palm beetle pest Oryctes in SE Asia, the Pacific region and Africa.

It is an anamorph, a suggested teleomorph was Cordyceps brittlebankisoides.