anisopliae": based on a multigene phylogenetic approach using near-complete sequences from nuclear DNA.

However ARSEF 2107 (from Oregon, USA) is considered an authentic strain because the taxon's author, Petch,[3] identified it and we designate it here as an ex-epitype.

This colour variant may occur regularly in nature based on the fact that Petch had identified a number of isolates as M. brunneum from geographically distant locations.

However it is important to note that the majority of M. brunneum isolates examined by Bischoff et al. were olive-green in colour (similar to M. anisopliae), rather than the buff and tan pigmentation described for the type specimen and the ex-epitype cultures, respectively.

In 2021, a custom-bred strain of M. brunneum was created to target and kill the varroa mite that afflicts honeybee populations.