Ambrosia-beetle
Guides
Scolytinae
Bark and Ambrosia Beetles, Bark Beetles
Scolytinae is a subfamily of weevils (Curculionidae) comprising approximately 220 genera and 6,000 species commonly known as bark and ambrosia beetles. Members are characterized by their specialized association with woody plants, where they excavate galleries beneath bark for reproduction and larval development. The subfamily includes some of the most economically significant forest pests globally, such as the southern pine beetle (Dendroctonus frontalis) and mountain pine beetle (Dendroctonus ponderosae), which cause billions of dollars in timber losses. Species exhibit diverse feeding strategies: phloem-feeding bark beetles consume living or dying tree tissues, while ambrosia beetles cultivate symbiotic fungi in galleries as a food source.
Scolytodes
Scolytodes is a genus of small bark beetles in the tribe Ctenophorini, distributed throughout the Neotropics from Mexico to South America. Many species are associated with specific host plants, particularly Cecropia and Ficus, with some exhibiting ambrosia beetle behavior involving fungal cultivation in galleries. The genus has undergone extensive taxonomic revision, with numerous new species described from Central and South America in recent decades.
Scolytodes schwarzi
Scolytodes schwarzi is a bark beetle species described by Wood & Bright in 1992, belonging to the genus Scolytodes within the weevil family Curculionidae (subfamily Scolytinae). It is distributed across the Caribbean, Middle America, and North America. As a member of Scolytodes, it is part of a genus of small ambrosia beetles that typically colonize dead or dying wood.
Treptoplatypus
Treptoplatypus is a genus of ambrosia beetles (pinhole borers) in the family Curculionidae, subfamily Platypodinae. The genus comprises more than 20 described species, including the rare European species T. oxyurus, which forms obligate nutritional symbioses with ambrosia fungi cultivated within wood galleries. Members of this genus are wood-boring insects that colonize dead or dying trees, with some species showing specialized host associations.
Treptoplatypus abietis
Treptoplatypus abietis is a species of weevil in the family Curculionidae, described by Bright & Skidmore in 2002. The genus Treptoplatypus contains ambrosia beetles that bore into wood. The specific epithet "abietis" suggests an association with fir trees (genus Abies). The species is provisionally accepted in taxonomic databases with limited published information available.
Treptoplatypus wilsoni
Treptoplatypus wilsoni is a species of weevil in the family Curculionidae, described by Bright and Skidmore in 2002. The species belongs to the genus Treptoplatypus, which comprises ambrosia beetles that typically cultivate fungal symbionts in wood galleries. Based on the taxonomic placement and known biology of related species in this genus, T. wilsoni is likely associated with woody substrates, though specific ecological details remain poorly documented. The species has been recorded from British Columbia, Canada.
Trypodendron
Trypodendron is a genus of ambrosia beetles in the family Curculionidae, subfamily Scolytinae. Species in this genus are fungus-farmers that cultivate symbiotic fungi in galleries excavated within wood. Several species, including T. lineatum, T. domesticum, T. signatum, and T. laeve, are economically significant pests of timber. The genus is characterized by specialized pheromone-mediated aggregation behavior and obligate nutritional mutualisms with specific fungal partners.
Trypodendron betulae
birch ambrosia beetle
Trypodendron betulae, the birch ambrosia beetle, is a North American ambrosia beetle in the family Curculionidae. It attacks standing stressed sub-canopy birch trees, particularly paper birch (Betula papyrifera). Male and female pairs construct galleries in sapwood where they cultivate symbiotic Ambrosiella fungi for larval nutrition. The species has a female-produced aggregation pheromone blend of (3S,6R)-trans- and (3R,6R)-cis-linalool oxide pyranoid, which chemically isolates it from sympatric Trypodendron species. Adults emerge in September and overwinter in leaf litter.
Trypodendron domesticum
European hardwood ambrosia beetle
Trypodendron domesticum is a European ambrosia beetle in the family Curculionidae. It is a wood-boring pest of hardwoods that has been introduced to North America. The species is morphologically similar to the closely related T. lineatum, requiring molecular methods for reliable identification. It is one of four Trypodendron species documented in Europe.
Trypodendron retusum
Trypodendron retusum is a small ambrosia beetle in the subfamily Scolytinae, described by Wood & Bright in 1992. The species belongs to the genus Trypodendron, a group of wood-boring beetles that cultivate fungal gardens in their galleries. It occurs in boreal and temperate forests of North America, with records from Alberta, British Columbia, Manitoba, and New Brunswick in Canada. Like other Trypodendron species, it is presumed to be an ambrosia beetle that feeds on fungal symbionts rather than wood tissue, though specific details of its biology remain poorly documented.
Trypodendron scabricolle
Trypodendron scabricolle is a bark beetle in the weevil family Curculionidae, subfamily Scolytinae. It belongs to the tribe Xyleborini, a group of ambrosia beetles that cultivate fungal gardens in wood. The genus Trypodendron comprises small to medium-sized ambrosia beetles that tunnel into the wood of dead or dying trees. This species, like other members of its genus, is associated with fungal symbiosis rather than direct phloem feeding.
Xyleborini
ambrosia beetles, xyleborine ambrosia beetles
Xyleborini is a tribe of ambrosia beetles within the subfamily Scolytinae (Curculionidae), comprising highly specialized weevils that cultivate symbiotic fungi for food. The tribe dominates ambrosia beetle faunas across Eurasia and the Americas, with the type genus Xyleborus containing over 500 species, though this genus represents an unnatural grouping of distantly related species. Many Xyleborini are economically significant invasive pests that attack healthy trees, while others are secondary colonizers of dead or dying wood. The tribe exhibits exceptional diversity with numerous genera, many of which are small or monotypic.
Xyleborinus
Xyleborinus is a genus of ambrosia beetles in the subfamily Scolytinae, comprising over 80 described species. These beetles are fungus-farmers that excavate galleries in wood and cultivate symbiotic fungi as their primary food source. The genus includes economically significant species such as Xyleborinus saxesenii, which has been associated with rapid apple decline in North American orchards. Xyleborinus exhibits extraordinary morphological diversity, particularly in Madagascar where a recent radiation produced at least 32 endemic species following a single colonization event 8.5–11.0 million years ago.
Xyleborinus andrewesi
Xyleborinus andrewesi is a small ambrosia beetle in the weevil subfamily Scolytinae. Native to the Old World tropics, it has been widely introduced to the New World. The species is polyphagous and has been recorded from 59 host plants across 29 families. It was synonymized with Xyleborinus mimosae in a 2021 taxonomic revision.
Xyleborinus artestriatus
Xyleborinus artestriatus is a species of ambrosia beetle in the subfamily Scolytinae. Like other members of its genus, it is a fungus-farming beetle that excavates galleries in wood and cultivates symbiotic fungi for larval nutrition. The species has been recorded in North America, Australia, Oceania, and Southern Asia. Its specific ecological role and host associations remain poorly documented compared to better-studied congeners such as Xyleborinus saxesenii.
Xyleborinus attenuatus
Xyleborinus attenuatus is an invasive ambrosia beetle native to East Asia that has established throughout Europe and North America. As a member of the subfamily Scolytinae, it cultivates symbiotic ambrosia fungi within galleries excavated in wood, feeding on the fungal growth rather than the wood itself. In Central Europe, it completes one generation annually with flight activity occurring from mid-March to May and F1 adults emerging in August and September. It predominantly colonizes soft deciduous trees and has not been reported to cause significant economic damage, though it vectors multiple ambrosia fungi species.
Xyleborinus gracilis
Xyleborinus gracilis is a species of ambrosia beetle in the family Curculionidae, subfamily Scolytinae. It was described by Wood & Bright in 1992. As a member of the ambrosia beetle tribe Xyleborini, it engages in fungus-farming behavior, excavating galleries in wood and cultivating symbiotic fungi as a food source for its larvae. The species has been documented across multiple continents including North America, South America, Africa, the Caribbean, and Middle America.
Xyleborinus saxesenii
fruit-tree pinhole borer, Keyhole Ambrosia Beetle
Xyleborinus saxesenii is a small ambrosia beetle native to the Palaearctic region that has become one of the most widespread invasive ambrosia beetles globally. It exhibits facultative eusociality with cooperative breeding, where adult daughters delay dispersal to assist with brood care, fungus farming, and nest maintenance. The species cultivates Raffaelea sulphurea as its primary fungal mutualist, though it has been observed to feed on wood tissue as well, making it xylomycetophagous. It primarily colonizes dead or dying wood but has been documented attacking live trees, including economically important species such as chestnut and apple, causing concern in forestry and orchard management.
Xyleborus
ambrosia beetles, bark beetles
Xyleborus is a genus of ambrosia beetles in the family Curculionidae (subfamily Scolytinae). These small wood-boring beetles are characterized by their obligate symbiotic relationship with ambrosia fungi, which they cultivate in galleries carved into host trees and use as their primary food source. Several species have become significant invasive pests, including Xyleborus glabratus (redbay ambrosia beetle), which vectors the fungus causing laurel wilt disease. The genus includes both native and introduced species with varying degrees of host specificity.
Xyleborus affinis
sugarcane shot-hole borer
Xyleborus affinis is a highly widespread ambrosia beetle native to the American tropics, now found in tropical and subtropical regions worldwide. It cultivates symbiotic fungi in galleries bored into decaying wood, feeding exclusively on these fungal gardens. The species exhibits facultative eusociality with delayed dispersal of adult offspring, who assist with nest maintenance and brood care. Females are the dispersing sex and are strongly attracted to ethanol and specific host plant volatiles. Despite frequent association with declining trees, it primarily colonizes wood already in early decay rather than causing primary mortality.
Xyleborus bispinatus
Xyleborus bispinatus is a tropical ambrosia beetle in the tribe Xyleborini. Native to the Americas, it has established populations in Florida and been introduced to the Iberian Peninsula. The beetle maintains nutritional mutualisms with ambrosia fungi and has demonstrated unusual flexibility in acquiring symbionts from invasive beetle species, including plant pathogens. It is a potential vector for laurel wilt disease and has been associated with avocado decline in multiple regions.
Xyleborus celsus
Hickory Timber Beetle
Xyleborus celsus, commonly known as the hickory timber beetle, is a bivoltine ambrosia beetle native to North America. It specializes in colonizing stressed or dying black hickory trees (Carya texana) and other hickory species. The species overwinters as adults and completes development from egg to adult in approximately 35 days. Unlike some invasive congenerics, it appears to be a native primary colonizer of weakened trees rather than an aggressive killer of healthy hosts.
Xyleborus ferrugineus
Xyleborus ferrugineus is an ambrosia beetle (subfamily Scolytinae) that cultivates symbiotic fungi for nutrition rather than feeding directly on wood. Females bore into host trees to create galleries where they farm ambrosia fungi, which serve as the sole food source for adults and larvae. The species exhibits strong sexual dimorphism, with females being larger, more numerous, and solely responsible for gallery formation and colony founding. It has been documented as a potential vector of Ceratocystis cacaofunesta, the causal agent of lethal wilt disease in cocoa.
Xyleborus glabratus
Redbay Ambrosia Beetle
Xyleborus glabratus is a small ambrosia beetle native to Asia that has become a destructive invasive pest in the southeastern United States since its detection in 2002. The species is the primary vector of Raffaelea lauricola, the fungal pathogen that causes laurel wilt disease, which has killed millions of native Lauraceae trees including redbay, sassafras, and avocado. Females are the dispersing sex and initiate galleries in host wood, where they cultivate fungal gardens as food for their offspring. The beetle's rapid spread threatens both forest ecosystems and commercial avocado production.
Xyleborus horridus
Xyleborus horridus is a bark beetle species in the family Curculionidae, described by Eichhoff in 1869. It is recorded from North America and Middle America. As a member of the genus Xyleborus, it belongs to a group of ambrosia beetles that cultivate symbiotic fungi in wood galleries.
Xyleborus impressus
Xyleborus impressus is a species of ambrosia beetle in the family Curculionidae, first described by Eichhoff in 1868. As a member of the genus Xyleborus, it exhibits the characteristic fungus-farming behavior of ambrosia beetles, cultivating symbiotic fungi within wood galleries. The species has been documented in both North and South America. Like other ambrosia beetles, it is a wood-boring insect that lives most of its life concealed within host trees.
Xyleborus pfeili
Xyleborus pfeili is an ambrosia beetle in the subfamily Scolytinae, native to regions including Europe and Asia. Like other ambrosia beetles, it cultivates symbiotic fungi within wood tunnels as its primary food source. Laboratory studies have documented its reproduction on semi-artificial diets, revealing arrhenotokous parthenogenesis where unmated females produce only male offspring. The species has been successfully reared using sawdust-based diets with fungal symbionts, providing a model for studying ambrosia beetle biology.
Xyleborus pubescens
Xyleborus pubescens is a species of bark beetle in the weevil family Curculionidae. First described by Zimmermann in 1868, this small wood-boring beetle belongs to a genus known for fungus-farming behavior, where beetles cultivate symbiotic fungi in tunnels they excavate within wood. The species occurs in North America, with records extending from the Caribbean through Middle America to Canada, including Ontario.
Xyleborus viduus
Xyleborus viduus is a species of bark beetle in the family Curculionidae, first described by Eichhoff in 1878. It is native to North America and belongs to a genus containing numerous ambrosia and bark beetle species, many of which are economically significant forest pests. The species is provisionally accepted in taxonomic databases, indicating some uncertainty regarding its current classification status.
Xyleborus volvulus
Xyleborus volvulus is a bark beetle in the family Curculionidae. It is native to tropical and subtropical regions and has been documented in North America, the Caribbean, Middle America, and Africa. The species is an ambrosia beetle that cultivates symbiotic fungi in tunnels bored into wood. It has been observed to carry Raffaelea lauricola, the pathogen causing laurel wilt disease, which has altered its status from a wood degrader to a potential pest of avocado and other lauraceous trees.
Xyleborus xylographus
Xyleborus xylographus is a species of bark beetle in the family Curculionidae, first described by Thomas Say in 1826. It belongs to the tribe Xyleborini, which includes ambrosia beetles that cultivate symbiotic fungi in wood galleries. The species has been recorded in North America, the Caribbean, and Southern Asia. Like other members of its genus, it likely engages in fungus-farming behavior, though specific ecological details for this species remain limited in published literature.
Xylosandrus
Xylosandrus is a genus of ambrosia beetles in the subfamily Scolytinae, family Curculionidae, containing approximately 54 species globally. The type species is Xyleborus morigerus (Blandford, 1894). Species in this genus are fungus-farming beetles that excavate gallery chambers in wood, introduce symbiotic fungi, and feed on fungal growth rather than wood tissue. Several species, including X. crassiusculus and X. germanus, have become invasive pests of ornamental and fruit trees in North America and elsewhere.
Xylosandrus amputatus
Xylosandrus amputatus is a species of ambrosia beetle in the weevil family Curculionidae, subfamily Scolytinae. The species has been used as a model organism in studies of mycangial structure, with micro-CT scanning revealing detailed three-dimensional anatomy of its fungus-storing organs. It is known from North America and Southern Asia. Like other ambrosia beetles in the genus, it engages in obligate mutualism with fungi, carrying symbionts in specialized internal structures called mycangia.
Xylosandrus compactus
black twig borer, black coffee borer, black coffee twig borer, tea stem borer
Xylosandrus compactus is a highly invasive ambrosia beetle (Scolytinae) native to subtropical Asia. Females tunnel into twigs of living woody plants, cultivate symbiotic fungi as larval food, and reproduce through arrhenotokous parthenogenesis. The species has spread to over 50 countries, becoming a significant agricultural pest of coffee, tea, cocoa, and avocado, and threatening native forest ecosystems in invaded regions.
Xylosandrus crassiusculus
Granulate Ambrosia Beetle, Asian Ambrosia Beetle
Xylosandrus crassiusculus is a small ambrosia beetle native to tropical and subtropical Asia that has become one of the most successful invasive wood-boring beetles globally. Adults are reddish-brown, 2–3 mm long, and exhibit a specialized fungus-farming mutualism. Females excavate galleries in wood, introduce the symbiotic fungus Ambrosiella roeperi, and cultivate it as the sole food source for themselves and their offspring. The species is polyphagous on broadleaf trees and shrubs, infesting stressed nursery stock, young trees, and stacked timber, causing economic damage in forestry and agriculture.
Xylosandrus germanus
black stem borer, alnus ambrosia beetle, black timber bark beetle
Xylosandrus germanus is a tiny ambrosia beetle native to eastern Asia that has become a significant invasive pest in Europe and North America. Females, which are flight-capable and substantially larger than the flightless males, excavate galleries in stressed or recently dead woody plants to cultivate fungal gardens. The species exhibits a quasisocial structure with foundress females performing distinct behavioral roles that shift from gallery construction and brood care to entrance-blocking as the colony matures. Its rapid spread—tens of kilometers per year in some regions—is facilitated by climate change, global timber trade, and an unusual reproductive system where single foundresses can establish populations through sib-mating.
Xyloterini
Xyloterini is a tribe of ambrosia beetles within the subfamily Scolytinae (Curculionidae). Members are characterized by fungal cultivation behavior and association with woody host plants. The tribe includes genera such as Xyloterinus and Indocryphalus. Xyloterinus politus, the type species of Xyloterinus, attacks black oak trees and maintains mutualistic relationships with ambrosia yeasts including Candida xyloterini, a yeast species named after this beetle tribe.
Xyloterinus
Xyloterinus is a monotypic genus of ambrosia beetles in the family Curculionidae, containing the single species Xyloterinus politus. Native to eastern North America, this beetle infests both hardwood and softwood trees, particularly recently fallen or cut timber. The species cultivates fungal gardens in wood galleries and has been extensively studied for its symbiotic relationships with yeasts and other fungi.
Xyloterinus politus
Polished Bark Beetle
Xyloterinus politus is a North American ambrosia beetle in the family Curculionidae, historically placed in Scolytidae. It is the sole species in the monotypic genus Xyloterinus. The species exhibits obligate mutualism with cultivated fungi, excavating galleries in hardwood and softwood trees where it grows and feeds on ambrosial fungi rather than wood tissue. Females initiate gallery construction and maintain fungal gardens; males do not excavate galleries and are excluded from active attacks. The beetle overwinters as an adult in old galleries and cradles.