In recent years, a whitefly species has become more abundant in Belgian pear orchards, and a survey over six locations in the province of Limburg in 2017 showed it to be exclusivelySiphoninus phillyreaeHaliday, the ash whitefly. Although the puparia of the species are fairly easy to recognize in the field,S. phillyreaemost probably has previously been overlooked but present in Belgium. Although the species is an important pest in some parts of the world, so far no significant damage has been observed in Belgian pear orchards. This is the first report of this pest in Belgium.