During the creation of DEFRA’s ash pest list in response to ash dieback, Monochamus guttulatus was identified as a potential pest of ash that could cause damage within the UK. Given the very high degree of uncertainty surrounding the pest, a risk register entry and subsequent PRA was requested. This rapid PRA shows: Monochamus guttulatus is a beetle pest of a wide range of broadleaved hosts in the Russian Far East, northern China and Korea. The pest causes no significant economic impact in its current distribution. The available information about the pest is very limited with very high degrees of uncertainty surrounding every aspect of this PRA.