Summary In May 2020, populations of Eriophyid mites were detected on tree heaven , Ailanthus altissima Mill., in a recreative park the city Colombes, near Paris, and later August September four locations, Southern France. Morphological examination supplemented with sequencing data for cytochrome c oxidase subunit I ( COI ) assigned all collected to single species, Aculus mosoniensis (Ripka) (Ac...