Fraxinus
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.
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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planipennis
Emerald Ash Borer, EAB
Agrilus planipennis, the emerald ash borer, is a highly destructive invasive beetle native to northeastern Asia. First detected in North America in 2002 (Michigan) and European Russia in 2003, it has since spread to 36 U.S. states, five Canadian provinces, and across Eastern Europe. The species has killed hundreds of millions of ash trees, causing severe ecological and economic damage. In its native range, it occurs at low densities without significant tree mortality; in invaded regions, it typically kills over 90% of ash trees within 2–4 years of establishment.
Agrilus subcinctus
Native Ash Borer
Agrilus subcinctus, commonly known as the native ash borer, is a North American jewel beetle (Buprestidae) that develops in ash (Fraxinus) trees. Unlike the invasive emerald ash borer (A. planipennis), this species is restricted to dead ash twigs for larval development. Adults are active from late May through mid-August, with peak flight in June. The species serves as host for multiple hymenopteran parasitoids and has been studied for its distinct mating behavior, which involves visual aerial orientation followed by contact chemical signal evaluation.
Caloptilia fraxinella
Ash Leaf Cone Roller, Ash Leaf Cone Roller Moth
Caloptilia fraxinella is a leaf-mining moth in the family Gracillariidae. Native to North America, it has become a significant pest of horticultural ash trees (Fraxinus spp.) in Canadian Prairie cities and parts of the United States. The species exhibits an unusual life history with a 9-month adult reproductive diapause; adults eclose in summer, overwinter, and mate the following spring. Larvae mine ash leaves and eventually roll leaflets into cones for pupation.
Dasineura pellex
ash bullet gall midge
Dasineura pellex, commonly known as the ash bullet gall midge, is a species of gall midge in the family Cecidomyiidae. The species induces distinctive bullet-shaped galls on ash trees (Fraxinus spp.). Like other members of the genus Dasineura, it is a specialist herbivore with a close association to its host plant. The species has been documented across parts of North America, with records from the northeastern United States including Vermont.
Dasineura tumidosae
Ash Petiole Gall Midge
Dasineura tumidosae is a gall midge in the family Cecidomyiidae that induces galls on ash trees (Fraxinus spp.). The species is known primarily from its association with ash petioles, where larvae develop within characteristic swellings. Like other Dasineura species, it has a narrow host range tied to specific plant tissues. The midge has been recorded from the northeastern United States, particularly Vermont.
Hylesinus aculeatus
eastern ash bark beetle
Hylesinus aculeatus, commonly known as the eastern ash bark beetle, is a species of bark beetle in the family Curculionidae. It is one of approximately 20 species in the genus Hylesinus, which are primarily associated with ash trees (Fraxinus spp.). The species is native to North America and has been documented across a broad geographic range from Canada through the United States. Like other bark beetles in this genus, it is likely a phloem feeder that develops under the bark of host trees, though specific biological details remain poorly documented in published literature.
Leptoypha minor
Arizona ash lace bug, ash lace bug
Leptoypha minor, commonly known as the Arizona ash lace bug, is a species of lace bug in the family Tingidae. It is a documented pest of ash trees (Fraxinus spp.), causing damage to twigs and foliage. The species is particularly abundant in California and has been economically significant as an ornamental pest since its formal description in 1942.
Lignyodes
Ash Seed Weevils
Lignyodes is a genus of weevils in the family Curculionidae, commonly known as ash seed weevils. The genus contains more than 30 described species. Members of this genus are associated with ash trees (Fraxinus spp., Oleaceae) as host plants. The genus was established by Dejean in 1835.
Manduca brontes
Manduca brontes is a sphinx moth (Sphingidae) first described by Dru Drury in 1773. The species occurs in the Caribbean region and northern South America. Adults are known to be active from April to June in Florida. Larvae feed on several host plant species including Tecoma and Fraxinus.
Olceclostera angelica
Angel Moth
Olceclostera angelica, the angel moth, is a small to medium-sized moth in the family Apatelodidae. First described by Augustus Radcliffe Grote in 1864, it occurs across eastern North America from Quebec and Maine south to Florida, west to Texas, and north to Wisconsin and Ontario. Adults are active from May through September in deciduous forest habitats. The larval stage feeds specifically on ash (Fraxinus) and lilac (Syringa) leaves.
Oobius agrili
Oob
Oobius agrili is a tiny, solitary egg parasitoid wasp in the family Encyrtidae, native to Northeast Asia. It is the only egg parasitoid released for biological control of the invasive emerald ash borer (Agrilus planipennis) in North America, where it has been introduced in over 31 US states. The species is parthenogenic, produces multiple generations annually, and achieves partial phenological synchrony with its host's egg-laying period. Individual females can parasitize more than 60 host eggs, with field parasitism rates reaching 60% in optimal conditions.
Papaipema furcata
Ash Shoot Borer Moth, ash tip borer
Papaipema furcata is a noctuid moth whose larvae bore into the twigs of ash trees (Fraxinus spp.) and box elder (Acer negundo). Adults are active from late summer through autumn, with a wingspan of 33–49 mm. The species ranges across eastern and central North America from Quebec to Georgia and west to Louisiana and Manitoba.
Prays fraxinella
Ash Bud Moth
Prays fraxinella, the ash bud moth, is a European moth in the family Praydidae. Larvae are leaf miners that feed on ash tree foliage and buds. The species exhibits two color forms: a typical white and black pattern, and a melanic form formerly called f.rustica, which has been reclassified as a separate species, Prays ruficeps. Adults are active in two generations per year, with flight periods in late spring and again in mid-summer.
Prociphilus fraxinifolii
leafcurl ash aphid
Prociphilus fraxinifolii, commonly known as the leafcurl ash aphid, is a species of woolly aphid in the family Aphididae. It is a specialist feeder on ash (Fraxinus) species, causing characteristic leaf curl damage to host plants. Like other members of the genus Prociphilus, it produces dense white waxy secretions that give colonies a distinctive woolly appearance. The species has been documented in parts of Europe including Serbia, Bulgaria, Hungary, and Poland, with observations also recorded in North America.
Pseudoloxops coccineus
Pseudoloxops coccineus is a small plant bug in the family Miridae, originally described from Europe in 1843. The species has been introduced to North America, with established populations documented in Ontario, Canada since approximately 1973. Its introduction is believed to have occurred accidentally via nursery stock importations of European ash (Fraxinus excelsior). The species belongs to a genus that has undergone significant taxonomic revision in recent years, with integrative approaches revealing substantial cryptic diversity in Pacific island populations.
Tomostethus
ash sawflies
Tomostethus is a genus of sawflies in the family Tenthredinidae, first described by Konow in 1886. Species within this genus are associated with ash trees (Fraxinus spp.) and are recognized as pests of economic and ecological significance. The genus includes species such as T. nigritus, T. multicinctus, and T. sinofraxini, which have been documented across Europe and Asia. Several species have shown capacity for population outbreaks, particularly in urban environments.
Tropidosteptes
ash plant bugs
Tropidosteptes is a genus of plant bugs (Miridae) containing at least 30 described species. The genus is best known from T. chapingoensis, the ash plant bug, which has been studied in detail for its life cycle and impact on urban ash trees. Species in this genus are associated with Fraxinus (ash) trees and can cause significant defoliation damage. The genus occurs in North America, with at least one species introduced to South America.