Fungus-farming
Guides
Ambrosiodmus
Ambrosiodmus is a genus of ambrosia beetles (Scolytinae) in the family Curculionidae, comprising at least 100 described species. These beetles are distinguished by their obligate mutualism with the white-rot decay fungus Flavodon subulatus (formerly Flavodon ambrosius), a unique symbiosis among ambrosia beetles. Unlike most ambrosia fungi that merely extract nutrients from recently dead wood, Flavodon is a true wood degrader capable of decomposing cellulose and lignin. This superior fungal mutualist enables Ambrosiodmus species to establish large, semi-social colonies with thousands of individuals and to colonize and decay wood over multiple generations. Several species, including A. minor and A. rubricollis, have become invasive outside their native ranges.
Ambrosiodmus hagedorni
Ambrosiodmus hagedorni is an ambrosia beetle in the weevil family Curculionidae, described by Wood & Bright in 1992. Like other members of its genus, it farms the white-rot decay fungus Flavodon ambrosius, a unique symbiont capable of true wood decomposition. This mutualism enables the beetle to colonize and persist in decaying wood over multiple generations, supporting larger colony sizes than typical ambrosia beetles. The species is known from Brazil and represents part of a distinctive beetle-fungus symbiosis that differs fundamentally from other ambrosia systems.
Ambrosiodmus minor
Punky Wood Ambrosia Beetle
Ambrosiodmus minor is an invasive ambrosia beetle in the southeastern United States, including Florida. It cultivates a unique ambrosia fungus, Flavodon subulatus, which causes rapid wood rot in dead trees. The beetle is considered of low economic importance as evident major impacts have not been observed, though wood decay from this association is increasing across its introduced range. Native to Asia, it has established populations in North America and has been recorded from mainland China with documented host associations on multiple tree genera.
Ambrosiodmus obliquus
Ambrosiodmus obliquus is a species of ambrosia beetle in the weevil family Curculionidae, first described by Blackman in 1928. Like other members of the genus Ambrosiodmus, this beetle engages in a specialized symbiotic relationship with wood-decaying fungi, specifically species in the genus Flavodon. The beetle farms these fungi in galleries excavated within wood, where the fungus serves as the primary food source for both adults and larvae. This species has been documented across multiple continents including North America, the Caribbean, Middle America, Africa, and South America.
Ambrosiodmus rubricollis
Ambrosiodmus rubricollis is an ambrosia beetle native to eastern and southern Asia that has been introduced to Europe and North America. As a member of the genus Ambrosiodmus, it maintains a mutualistic symbiosis with the white-rot fungus Flavodon ambrosius, which is capable of true wood decomposition—an unusual trait among ambrosia beetles. The species has been documented attacking young Tasmanian blue gum trees (Eucalyptus globulus) in Portugal and has been detected in Slovenia and Italy. Its introduction to non-native regions raises concern given the potential of Ambrosiodmus species to vector pathogenic fungi.
Ambrosiodmus tachygraphus
Ambrosiodmus tachygraphus is a North American ambrosia beetle described by Hopkins in 1915. Like other members of the genus Ambrosiodmus, it engages in obligate mutualism with fungal symbionts, specifically the wood-decaying fungus Flavodon ambrosius. This partnership enables the beetle to colonize and reproduce in dead or dying wood by farming fungi that digest cellulose and lignin, converting wood into nutritious food for beetle larvae and adults. The species is part of a group known for forming semi-social colonies with thousands of individuals, facilitated by their unique ability to cultivate a true wood-degrading fungus rather than merely extracting readily available nutrients from freshly dead tissues.
Ambrosiophilus atratus
Black Bark Weevil
Ambrosiophilus atratus is a non-native ambrosia beetle in the weevil family Curculionidae, subfamily Scolytinae. First recorded in Europe in Slovenia in 2017 during monitoring surveys for invasive ambrosia beetles. The species is distinguished by pronounced asperities covering the entire pronotum surface. Native to North America and Southern Asia, it has established populations in Europe through human-mediated introduction.
Coptoborus
Coptoborus is a genus of ambrosia beetles in the weevil family Curculionidae, subfamily Scolytinae, tribe Xyleborini. These tiny beetles bore into trees and cultivate fungus as food, a behavior characteristic of ambrosia beetles. The genus contains more than 70 described species, with many new species discovered in Central and South America in recent years. Some species are economically significant pests, particularly of balsa trees in Ecuador.
Euplatypus pini
Euplatypus pini is a small ambrosia beetle (Curculionidae: Platypodinae) originally described as Platypus pini by Hopkins in 1905 and later transferred to Euplatypus by Bright & Skidmore in 2002. Like other ambrosia beetles, it excavates galleries in wood and cultivates symbiotic fungi as a food source for its larvae. The species name indicates an association with pine (Pinus) hosts.
Euwallacea
Ambrosia beetles, Shot hole borers
Euwallacea is a genus of ambrosia beetles within the tribe Xyleborini. All species are obligate symbionts with ambrosia fungi, which they farm in galleries excavated within host trees. The genus has a pantropical distribution with origins in Asia and Wallacea, and several species have become globally significant invasive pests. Members of the Euwallacea fornicatus species complex, including the polyphagous shot hole borer, cause substantial economic damage to fruit and timber trees through mass colonization and associated fungal pathogens.
Euwallacea interjectus
ambrosia beetle
Euwallacea interjectus is an ambrosia beetle native to Asia that has become an invasive pest in multiple regions worldwide. The species cultivates mutualistic Fusarium fungi in galleries within tree xylem, which serve as its primary food source. Females possess specialized mycangia for transporting fungal spores. The beetle has emerged as a significant economic threat to poplar plantations in China and has been documented attacking living trees, a behavior atypical for many ambrosia beetles. In Japan, it vectors Ceratocystis ficicola, a pathogenic fungus causing fig wilt disease.
Euwallacea perbrevis
tea shot-hole borer
Euwallacea perbrevis, the tea shot-hole borer, is an invasive ambrosia beetle native to South and Southeast Asia through Australia. It is part of the Euwallacea fornicatus cryptic species complex, distinguished from its three sibling species (E. fornicatus, E. fornicatior, and E. kuroshio) primarily through molecular genetics rather than morphology. The beetle cultivates symbiotic fungi in galleries bored into host trees and vectors fungal pathogens causing Fusarium branch dieback. It has been introduced to the United States (Florida, Hawaii), Costa Rica, and Panama, where it poses significant economic threats to avocado production and urban trees.
Gnathotrichus pilosus
Gnathotrichus pilosus is an ambrosia beetle species in the family Curculionidae, described by Wood in 1973. The species is distributed across North America and Middle America. Like other ambrosia beetles in the genus Gnathotrichus, it is presumed to cultivate fungal symbionts within wood galleries, though specific ecological details for this species remain limited in published literature.
Lymexylidae
ship-timber beetles
Lymexylidae, commonly known as ship-timber beetles, are a family of wood-boring beetles in the suborder Polyphaga. They represent the sole family in the superfamily Lymexyloidea. The family contains over 60 species across four subfamilies and approximately 15 genera, including both extant and fossil taxa dating to the Cretaceous. Many species form obligate symbiotic relationships with ambrosia fungi, which they cultivate and consume rather than feeding directly on wood. Some species are significant economic pests of timber and living trees.
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.
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 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 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 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 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 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.
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.