Forest-pest

Guides

Stilbosis ostryaeella
ironwood leafminer moth, ironwood leafminer
Stilbosis ostryaeella is a small moth in the family Cosmopterigidae. Its larvae are leafminers specialized on ironwood (Ostrya virginiana), creating distinctive blotch mines between leaf veins. The species is distributed across eastern North America, with adults active from late spring through summer. It overwinters as a pupa in leaf litter.
leafminer specialist ironwood blotch-mine forest-pest Cosmopterigidae Lepidoptera North-America Ostrya-virginiana endophagous univoltine pupal-diapause
Strophosoma
Strophosoma is a genus of weevils (Curculionidae: Entiminae) established by Billberg in 1820. The genus includes both bisexual and parthenogenetic species, with documented variation in reproductive mode between species such as S. capitatum (bisexual) and S. melanogrammum (parthenogenetic). These weevils are known to occur in forest habitats, where some species have been reported as pests in young forest stands. The genus has been subject to taxonomic revision, with subgenera Leucostrophus and Morphostrophus distinguished by morphological characters.
weevil parthenogenesis Wolbachia forest-pest Curculionidae Entiminae Europe North-America
Strophosoma melanogrammum
Nut Leaf Weevil
Strophosoma melanogrammum is a parthenogenetic weevil species native to Europe and introduced to North America. It is one of the most common Strophosoma species in Europe and has been studied extensively for its reproductive biology and association with Wolbachia endosymbionts. The species reproduces through parthenogenesis, with all-female populations, and is known as a pest in young forest stands.
parthenogenesis Wolbachia forest-pest introduced-species Europe North-America
Symmerista leucitys
orange-humped mapleworm moth, orange-humped mapleworm
Symmerista leucitys is a notodontid moth commonly known as the orange-humped mapleworm moth. The species is a univoltine specialist defoliator of sugar maple, with a single generation per year. Larvae exhibit distinctive leaf-clipping behavior, severing petioles after feeding and applying red saliva containing pigments from the anterior labial glands to the petiole stub. This saliva travels rapidly into the petiole xylem and is hypothesized to suppress plant defense responses in nearby leaves. During outbreak years, clipped leaves can comprise over 80% of greenfall losses in early October.
defoliator maple-specialist leaf-clipping-behavior salivary-manipulation univoltine forest-pest
Synanthedon acerrubri
Maple Clearwing Moth, Red Maple Borer
Synanthedon acerrubri is a clearwing moth in the family Sesiidae, commonly known as the maple clearwing moth or red maple borer. The species is a wood-boring pest of maple trees in eastern North America. Adults are diurnal and wasp-mimicking in appearance, with transparent wings and banded abdomens. Larvae tunnel into the trunks and branches of host trees, causing structural damage.
pest borer maple diurnal wasp-mimic Sesiidae forest-pest urban-pest wood-boring North-America eastern-North-America Acer-rubrum Acer-saccharum clearwing-moth Engelhardt-1925 Lepidoptera Synanthedon
Synanthedon pini
pitch mass borer, Pitch Mass Borer Moth
Synanthedon pini, commonly known as the pitch mass borer, is a clearwing moth in the family Sesiidae. It is found in eastern North America, where it develops in the wood of pine and spruce trees. The larvae create pitch-filled tunnels in the inner bark and sapwood, causing defects in lumber but not killing host trees. Adults are active in mid-summer and have distinctive mostly clear wings.
Sesiidae clearwing-moth forest-pest conifer wood-borer North-America Lepidoptera pitch-mass secondary-pest diurnal-moth
Syngrapha celsa
plain silver Y, western conifer looper
Syngrapha celsa is a noctuid moth known as the plain silver Y or western conifer looper. The species was described by Henry Edwards in 1881 and occurs in western North America. Larvae are specialized feeders on coniferous trees in the families Pinaceae and Cupressaceae.
noctuidae plusiinae conifer-feeder western-north-america forest-pest
Tetropium
spruce longhorn beetles
Tetropium is a genus of long-horned beetles (Cerambycidae) containing at least 20 described species, sometimes classified in its own monotypic tribe Tetropiini. Several species are significant forest pests, particularly of spruce (Picea) trees. The genus includes economically important species such as T. fuscum (brown spruce longhorn beetle), an invasive pest in Atlantic Canada, and T. castaneum. Adults are attracted to synthetic pheromones and host tree volatiles, making them amenable to detection and monitoring using baited traps.
forest-pest invasive-species spruce pheromone fuscumol phloeophagous wood-borer integrated-pest-management biological-invasion
Tetropium cinnamopterum
Eastern Larch Borer
Tetropium cinnamopterum is a native North American cerambycid beetle in the tribe Tetropiini. Adults are distinguished from the closely related T. parvulum by eye shape, scutellar structure, external genitalia, and pronotal puncture number; larvae are distinguished by urogomphi morphology. The species has been recorded from various conifer hosts, with larvae developing in conifer wood. It is transcontinental in Canada and occurs sympatrically with invasive T. fuscum in Atlantic Canada, where cross-attraction to the aggregation pheromone fuscumol may occur. Both sexes respond to (S)-fuscumol synergized by host monoterpenes and ethanol.
Cerambycidae Tetropiini conifer woodboring pheromone fuscumol native North-America Canada sympatric cross-attraction vector Ophiostoma fungi beetle-fungus-symbiosis invasive-species-interaction Tetropium-fuscum chemical-ecology forest-pest longhorn-beetle
Tetropium fuscum
Brown Spruce Longhorn Beetle
Tetropium fuscum is a wood-boring cerambycid beetle native to Europe and Northern Asia, established as an invasive species in Atlantic Canada since at least 1990. The species is a documented pest of spruce trees (Picea spp.), with larvae developing in the phloem of host trees. Adult males produce an aggregation pheromone called fuscumol that attracts both sexes, particularly when combined with host tree volatiles. In its introduced Canadian range, it has been observed infesting stressed and moribund red spruce, with larval galleries sometimes girdling stems and causing tree mortality.
cerambycidae spondylidinae longhorn-beetle wood-borer forest-pest invasive-species pheromone fuscumol spruce-pest phloeophagous
Tetropium parvulum
Northern Spruce Borer
Tetropium parvulum, the northern spruce borer, is a small cerambycid beetle specialized on spruce hosts. It was elevated from synonymy with T. cinnamopterum based on distinct morphological differences in larvae and adults, and exhibits strict host specificity to Picea compared to the conifer generalist T. cinnamopterum. The species has a one-year life cycle and is an economically important borer of white and Engelmann spruce logs in western Canada.
Cerambycidae spruce-borer wood-boring-beetle forest-pest western-Canada conifer-specialist Tetropium Picea economic-pest one-year-life-cycle Tetropium-parvulum Northern-Spruce-Borer Tetropium-cinnamopterum-complex morphological-diagnosis strict-host-specificity Tetropium-alaskanum-synonym Rhimphoctona-alaskensis-parasitoid spruce-log-pest Alberta-forestry boreal-forest-insect phloem-feeder cambium-borer L-shaped-galleries early-summer-emergence woodpecker-predation disease-mortality excess-heat-mortality Tetropium-velutinum-comparison lectotype-designation Tetropium-parallelum Tetropium-schwarzianum coniferous-forest-decomposer primary-borer Tetropium-taxonomy Casey-1891 Canadian-Entomologist economic-entomology forest-health timber-pest spruce-regeneration Picea-glauca-pest Picea-engelmannii-pest western-Canadian-distribution North-American-Cerambycidae Tetropium-morphology larval-urogomphi adult-genitalia pronotal-punctation eye-morphology scutellum-structure host-preference-divergence conifer-specialist-vs-generalist sympatric-species species-elevation-from-synonymy type-specimen-examination diagnostic-key forest-insect-natural-enemies insect-disease-mortality parasitoid-wasp woodpecker-insectivory thermal-mortality gallery-depth overwintering-biology spring-pupation September-larval-maturity one-year-univoltine spruce-logging-impact forest-management integrated-pest-management boreal-forest-ecology subcortical-insect phloeophagous-beetle xylophagous-larvae wood-degradation nutrient-cycling forest-succession disturbance-ecology fire-killed-spruce windthrow-spruce salvage-logging-insect standing-dead-timber spruce-beetle-complex Scolytinae-competitor Cerambycidae-community coniferous-wood-borer-guild North-American-forest-insects western-Canadian-entomology Alberta-entomology British-Columbia-entomology Manitoba-entomology Labrador-entomology transcontinental-distribution boreal-forest-biodiversity spruce-ecosystem-engineer 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biotic-interaction competition facilitation apparent-competition indirect-effect network-ecology food-web-topology trophic-level energy-flow biomass-pyramid productivity ecosystem-function ecosystem-service-valuation natural-capital green-accounting sustainable-development-goal Aichi-target Kunming-Montreal-framework 30x30-target protected-area OECM conservation-effectiveness management-effectiveness governance indigenous-knowledge local-knowledge citizen-science iNaturalist community-monitoring participatory-research knowledge-co-production transdisciplinary-research science-policy-interface IPBES IPCC FAO ITTO IUFRO CABI CFS USDA USFS NRCan provincial-forestry industrial-forestry smallholder-forestry community-forestry urban-forestry agroforestry social-forestry forest-restoration reforestation afforestation natural-regeneration assisted-natural-regeneration enrichment-planting direct-seeding nursery-practice seedling-quality outplanting-survival competition-control 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Thera
Thera is a genus of moths in the family Geometridae, subfamily Larentiinae, established by Stephens in 1831. The genus comprises numerous species distributed primarily across the Northern Hemisphere. Thera moths are small to medium-sized geometrids with relatively broad wings and cryptic coloration patterns. Larvae typically feed on coniferous trees, making several species economically significant as forest pests.
Geometridae Larentiinae conifer-feeding forest-pest Holarctic nocturnal univoltine
Tolype velleda
Large Tolype Moth, Velleda Lappet Moth
A medium-sized lappet moth with broad, rounded wings. Adults display dark gray forewings with distinct wavy transverse bands and white lines visible when wings are spread. Females are noticeably larger than males. The species has a broad distribution across eastern North America with disjunct populations in western mountain ranges and the Mediterranean region. Single-brooded, with adults active from early summer through late autumn.
forest-pest fruit-tree-pest univoltine transatlantic-distribution lappet-moth
Toumeyella liriodendri
tuliptree scale
Toumeyella liriodendri, the tuliptree scale, is a soft scale insect (Coccidae) native to North America and specialized on Liriodendron tulipifera (tuliptree or yellow-poplar). This univoltine species overwinters as second-instar nymphs on twigs, matures to adults in spring, and produces eggs that hatch into crawlers in early summer. First-instar nymphs feed on leaf undersides before migrating back to twigs in autumn. Males are unknown; reproduction is presumed parthenogenetic. Heavy infestations cause branch dieback, reduced growth, and honeydew production that supports sooty mold growth. The species has been the subject of recent genomic research, with a 536Mb genome assembly revealing it as an early-diverging soft scale with 17 chromosomes.
scale-insect soft-scale Coccidae Liriodendron tuliptree yellow-poplar univoltine parthenogenesis honeydew sooty-mold forest-pest ornamental-pest genome chromosome-evolution phloem-feeder ant-tended North-America Maryland Hemiptera Sternorrhyncha
Toumeyella parvicornis
pine tortoise scale
Toumeyella parvicornis is a soft scale insect in the family Coccidae, commonly known as the pine tortoise scale. Native to North America, it has become a serious invasive pest in Mediterranean Europe, particularly damaging stone pine (Pinus pinea) forests in Italy and France since its detection in 2015. Mature females are distinctive for their glossy reddish-brown, dome-shaped bodies resembling tiny tortoises, measuring 4–5 mm long. The species has a wide host range among pine species and reproduces parthenogenetically—males have never been recorded. Heavy infestations cause tree weakening, defoliation, and potential death through phloem feeding, with secondary impacts including sooty mold growth on honeydew excretions and altered fire behavior in affected forests.
invasive-species forest-pest scale-insect parthenogenesis phloem-feeder biological-control Mediterranean Pinus-pinea
Toumeyella pini
Striped Pine Scale
Toumeyella pini, commonly known as the Striped Pine Scale, is a soft scale insect native to North America. It is a significant pest of pine trees, particularly two- and three-needle pine species. The species exhibits pronounced sexual dimorphism in both morphology and feeding location: females are larger, highly convex, and develop on terminal twigs, while males are smaller, more elongate, and develop on needles. The species secretes copious honeydew, which attracts ants, wasps, bees, and flies, and can lead to sooty mold growth that inhibits photosynthesis. In southern Georgia, it completes three generations per year, with crawler activity peaking in May, mid-July to early August, and late October to early November.
scale-insect soft-scale pine-pest honeydew-producer Sternorrhyncha Coccidae North-America forest-pest ornamental-pest
Trachys
Leaf-mining Jewel Beetles
Trachys is a genus of leaf-mining jewel beetles (Buprestidae: Trachyinae) characterized by their flattened, compact, wedge-shaped adult morphology—an adaptation distinct from the elongate cylindrical form typical of most buprestids. The genus contains approximately 20 species in Japan and is widely distributed from Africa through Asia to Europe. Larvae mine within leaves rather than boring through wood, a habit that has driven their distinctive body plan. Some species are significant forest and agricultural pests, including the introduced Trachys minutus established in Massachusetts and T. yanoi, a serious pest of Zelkova serrata in East Asia.
Buprestidae Trachyinae leaf-miner jewel-beetle forest-pest Zelkova invasive-species Trachys-minutus Trachys-yanoi univoltine early-leaf-abscission
Tranosema
Tranosema is a genus of ichneumonid parasitoid wasps found in Europe and North America. Species in this genus are endoparasitoids of lepidopteran larvae, particularly tortricid moths. The best-studied species, T. rostrale, is a koinobiont parasitoid of the spruce budworm (Choristoneura fumiferana) and transmits a polydnavirus (ichnovirus) to its host during oviposition, which alters host development and physiology.
parasitoid ichneumonid polydnavirus forest-pest biological-control spruce-budworm koinobiont endoparasitoid
Tremecinae
woodwasps, horntails
Tremecinae is a subfamily of woodwasps (Siricidae) distinguished from Siricinae by its association with the white-rot fungus Cerrena unicolor rather than Amylostereum. Unlike Siricinae, which carry symbiotic fungi in specialized mycangia, at least some Tremecinae species lack these structures and do not internally transport fungal symbionts. Females locate host wood already infected with sapwood-decaying fungi using volatile compounds. The subfamily includes forest pests that interact with fungal communities in decaying wood.
Siricidae woodwasp horntail saproxylic forest-pest Cerrena-unicolor white-rot-fungus mycangia-absent olfactory-host-location Tremex-apicalis Ibalia-japonica parasitoid symbiosis Japan Asia
Trichoferus
Trichoferus is a genus of long-horned beetles (Cerambycidae) established by Wollaston in 1854, containing at least 20 described species. Several species have become economically significant as invasive wood-boring pests, with Trichoferus campestris (velvet longhorned beetle) being particularly well-documented for its worldwide expansion through international trade. The genus includes both native and introduced species with documented associations with living trees, cut wood, and wood packaging material.
Cerambycidae wood-borer invasive-pest polyphagous quarantine-pest long-horned-beetle Holarctic-distribution phytosanitary-concern forest-pest orchard-pest global-trade-vector
Trichoferus campestris
velvet longhorned beetle
Trichoferus campestris is a wood-boring longhorn beetle native to eastern Asia that has become an invasive species in North America and Europe. Adults are active from early summer, with peak abundance around 650 degree-days (base 10°C) in early July in Minnesota. The species is polyphagous, with documented reproduction on multiple hardwood species including Acer platanoides, Juglans nigra, and Malus domestica. Larvae develop in woody material and can complete development in cut branches.
invasive-species wood-borer polyphagous cerambycidae forest-pest phytosanitary
Trisetacus
Trisetacus is a genus of eriophyoid mites (Eriophyoidea: Phytoptidae, historically placed in Nalepellidae) that are obligate parasites of coniferous trees. Species within this genus exhibit strong host specificity, primarily infesting members of Pinaceae and Cupressaceae. The genus includes species with diverse feeding habits: some inhabit needle sheaths, others infest foliage, buds, or seeds. Molecular phylogenetic studies have revealed a deep dichotomy within Trisetacus, with two major lineages distinguished by female genital morphology and host associations—one lineage associated with Pinaceae and another with Cupressaceae. Several species are significant forest pests, causing damage ranging from needle chlorosis and twisting to complete destruction of seed crops. The genus has been subject to taxonomic revision, with 22 species recognized from North America alone.
eriophyoid-mite conifer-parasite forest-pest seed-predator gall-mite Nalepellinae host-specificity sexual-dimorphism molecular-phylogenetics
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.
ambrosia-beetle fungus-farming forest-pest timber-pest pheromone mutualism Scolytinae
Trypophloeus
Trypophloeus is a genus of bark beetles in the family Curculionidae, subfamily Scolytinae, containing approximately 12 species distributed across North America, Europe, and Asia. The genus is primarily associated with Salicaceae hosts, particularly Populus and Salix species. Trypophloeus populi has gained recent attention as the causative agent of sudden aspen decline in North America. Several species are significant forest pests, with T. klimeschi causing extensive damage to shelter forests in northwest China and T. binodulus affecting poplar plantations in Spain.
bark-beetle Scolytinae Populus Salix forest-pest sudden-aspen-decline semiochemical nematode-vector China Spain Alaska climate-change invasive-potential
Trypophloeus nitidus
Trypophloeus nitidus is a species of bark beetle in the weevil family Curculionidae, described by J.M. Swaine in 1912. The genus Trypophloeus comprises bark beetles that tunnel beneath bark of woody plants. As a member of this genus, T. nitidus is associated with coniferous hosts. The species was synonymized under Phymatodes mojavensis by some authors, but Phymatodes mojavensis was subsequently synonymized under Phymatodes nitidus in a 2010 nomenclatural revision by Swift and Ray, which affects the broader taxonomic context of this species. The species is provisionally accepted in current taxonomic databases.
Coleoptera Curculionidae bark-beetle conifer forest-pest wood-boring-beetle
Tycherus
Tycherus is a genus of parasitoid wasps in the family Ichneumonidae, first described by Förster in 1869. Species occur in Europe and North America, with records from Scandinavia, Denmark, Norway, Sweden, and eastern North America including Newfoundland and the Great Smoky Mountains. At least one species, Tycherus osculator, has been studied extensively as a biological control agent for tortricid forest pests. A specimen from the Great Smoky Mountains National Park identified via DNA barcoding likely represents an undescribed species.
parasitoid biological-control forest-pest ichneumonid DNA-barcoding undescribed-species
Xanthogaleruca luteola
elm leaf beetle
Xanthogaleruca luteola, the elm leaf beetle, is an invasive leaf beetle native to Europe that has become the most serious defoliator of elm trees in North America. Adults are yellow to olive-green with distinctive black lateral stripes and spots. Both adults and larvae feed on elm foliage, with larvae skeletonizing leaves by consuming soft tissue between veins. The species has multiple generations annually, with larvae overwintering in soil or bark crevices. Biological control using introduced parasitoids has reduced its pest status in many regions.
invasive-species forest-pest urban-pest biological-control defoliator Chrysomelidae Ulmus parasitoid integrated-pest-management
Xorides humeralis
Xorides humeralis is a parasitoid wasp in the family Ichneumonidae, subfamily Xoridinae. The species has been documented as a parasitoid of emerald ash borer (Agrilus planipennis) in North Carolina, where females were recorded from beetle galleries in ash trees. As a member of Xoridinae, it is presumed to be an ectoparasitoid of wood-boring beetle larvae, though direct biological observations beyond the host record remain limited.
parasitoid emerald-ash-borer biological-control forest-pest North-Carolina
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.
ambrosia-beetle fungus-farming invasive-pest Scolytinae weevil mutualism haplodiploid inbreeding forest-pest xylem-borer mycangia fungal-vector
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.
ambrosia-beetle bark-beetle fungus-farming polyphagous invasive Old-World-native New-World-introduced Scolytinae Curculionidae weevil forest-pest orchard-pest
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.
ambrosia-beetle invasive-species fungus-farming Scolytinae forest-pest vector
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.
ambrosia-beetle fungus-farming cooperative-breeding invasive-species forest-pest xylomycetophagous haplodiploid eusociality mutualism Scolytinae Curculionidae
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.
ambrosia-beetle fungus-farming wood-borer invasive-pest mycangia laurel-wilt Scolytinae symbiosis forest-pest agricultural-pest
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.
ambrosia-beetle fungus-farming symbiosis forest-pest cocoa-pest invasive-potential mycangia Scolytinae Xyleborini
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.
ambrosia-beetle invasive-species forest-pest vector laurel-wilt Raffaelea-lauricola Lauraceae parthenogenesis fungus-farming mycangia
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.
ambrosia-beetle fungus-farming-beetle wood-boring-beetle Curculionidae Xyleborus invasive-species-potential forest-pest symbiotic-fungus mycangia-bearing-beetle coleoptera scolytinae xyleborini
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.
bark-beetle ambrosia-beetle Curculionidae Scolytinae Xyleborini fungus-farming wood-boring-beetle invasive-potential forest-pest Coleoptera Xyleborus North-America Caribbean Asia Say-1826 Bostrichus-xylographus
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.
invasive-species ambrosia-beetle fungus-farming forest-pest orchard-pest sexual-dimorphism quasisocial arrhenotoky
Xylosteini
Tribe Xylosteini is a small, primitive group of longhorn beetles (Cerambycidae: Lepturinae) containing rare forest-dwelling species. In Türkiye, the tribe comprises four species across two genera: Leptorhabdium (exclusively deciduous-feeding) and Xylosteus (feeding on both deciduous and coniferous trees). These beetles are considered forest pests of ecological and economic significance due to their wood-boring larval habits.
Cerambycidae Lepturinae xylophagous forest-pest Türkiye rare-species host-specificity deciduous-trees coniferous-trees
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.
ambrosia-beetle fungal-mutualism wood-boring Curculionidae Scolytinae forest-pest
Zadiprion townsendi
bull pine sawfly
Zadiprion townsendi, commonly known as the bull pine sawfly, is a species of conifer sawfly in the family Diprionidae (Hymenoptera). The genus Zadiprion is a small group of sawflies whose larvae feed on pine needles. This species is associated with bull pine (Pinus ponderosa), serving as a defoliator of this economically important timber species. Like other diprionid sawflies, Z. townsendi undergoes complete metamorphosis with larval stages that feed gregariously on host foliage.
sawfly Diprionidae conifer-sawfly pine-defoliator Pinus-ponderosa bull-pine Hymenoptera forest-pest gregarious-larvae
Zale buchholzi
Buchholz's zale, Buchholz' Zale Moth
Zale buchholzi, commonly known as Buchholz's zale, is a moth species in the family Erebidae. It is restricted to coastal pinelands of the Atlantic and Gulf coastal plains of North America. The species has a single generation annually and is a specialist feeder on pine species as larvae.
pine-specialist coastal-plain-endemic univoltine noctuid-moth forest-pest North-America
Zapatella davisae
black oak gall wasp
Zapatella davisae is a cynipid gall wasp (Hymenoptera: Cynipidae) described in 2016 that has become a significant pest of black oak (Quercus velutina) in the northeastern United States. Larvae develop under bark in late summer, with adults emerging in early spring. The species has undergone notable population outbreaks on Long Island, NY (first documented 1990), Cape Cod and Martha's Vineyard, MA (2008), and more recently in coastal Rhode Island and Nantucket, MA. High parasitism rates by Sycophila species can lead to rapid population collapse, as observed on Long Island in 2016.
gall-wasp forest-pest oak invasive parasitoid Cynipidae outbreak Quercus-velutina northeastern-United-States
Zeiraphera
larch bud moths, spruce bud moths
Zeiraphera is a genus of tortricid moths in the subfamily Olethreutinae, comprising approximately 35 described species distributed across the Holarctic region. The genus includes economically significant forest pests, notably the larch bud moth (Z. diniana) and spruce bud moth (Z. canadensis), which undergo periodic population outbreaks causing defoliation of coniferous hosts. Several species exhibit complex ecological traits including host race formation, pheromone polymorphism, and long-distance wind-mediated dispersal. The genus is characterized by larval feeding on conifer needles and a tendency toward cyclic population dynamics in certain species.
forest-pest conifer-feeder population-cycles pheromone-polymorphism host-race wind-dispersal Arctic-migration phenological-synchrony
Zeiraphera improbana
larch needleworm moth, Larch Needleworm
Zeiraphera improbana is a small tortricid moth native to North America, commonly known as the larch needleworm moth. The species has a wingspan of approximately 19 mm. Its larvae are specialized feeders on Larix species, particularly tamarack (Larix laricina). The species is subject to parasitism by multiple hymenopteran families including braconid, ichneumonid, and chalcid wasps.
moth Lepidoptera Tortricidae larch Larix forest-pest North-America herbivore