Fagus
Guides
Acalitus ferrugineum
beech erineum mite
Acalitus ferrugineum is a microscopic eriophyid mite that induces erineum galls on the leaves of American beech (Fagus grandifolia). The galls appear as pale to light yellow patches that progress to reddish-brown later in the season. The species is known from the United States and Canada and has been documented in over 4,000 observations.
Agrilus obsoletoguttatus
Beech Borer
Agrilus obsoletoguttatus is a small metallic wood-boring beetle in the family Buprestidae, native to North America. It is among the smallest jewel beetle species utilized as prey by the specialist predatory wasp Cerceris fumipennis, which provisions its underground nests with paralyzed buprestid beetles. The species has been documented in nest caches containing up to 13 individuals, reflecting its small size relative to larger buprestid prey.
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flea weevils
Orchestes is a genus of flea weevils (Curculionidae) comprising six species in North America and additional species in Eurasia. Members are small beetles (2–4 mm) associated with woody host plants, particularly trees in Ulmaceae and Fagaceae. The genus was historically confused with Rhynchaenus, from which it has been redefined. Several species are significant pests: O. steppensis is a destructive invasive of elms in China and North America, O. alni (European elm flea weevil) damages elms in Europe and North America, and O. fagi attacks beech trees. Larval habits vary—most are leaf miners, though O. hustachei uniquely parasitizes aphid galls.
Orchestes fagi
Beech leaf-mining weevil, beech leaf-miner beetle
Orchestes fagi is a small weevil species native to Europe that has become invasive in North America, where it attacks American beech (Fagus grandifolia). The larvae mine the leaves of beech trees, while adults undergo an extended diapause of eight to nine months, overwintering on tree boles. The species has spread through eastern Nova Scotia, Canada, with human-assisted transport via firewood and timber implicated in its range expansion.
Psilocorsis cryptolechiella
Black-fringed Leaftier Moth, Black-fringed Psilocorsis Moth, Beech Leaftier
Psilocorsis cryptolechiella is a small moth in the family Depressariidae known for its distinctive larval behavior of tying leaves together to form shelters. The species is primarily associated with beech trees (Fagus species) and has been documented across the eastern and central United States. Adults are modest in appearance with a wingspan of approximately 16 mm. The larvae create characteristic leaf shelters by binding leaves together with silk, earning the species its common names.