Deutogyne
Guides
Aceria fraxini
Ash Bead Gall Mite
Aceria fraxini, commonly known as the ash bead gall mite, is an eriophyid mite that induces distinctive capsule galls on ash trees (Fraxinus spp.). This species exhibits a complex life cycle involving alternation of generations, with an overwintering generation consisting solely of parthenogenetic females (deutogynes) and a summer generation containing both sexes (protogynes and males). The mite is distributed across North America, where it is considered a minor pest of ornamental and native ash species.