Weevil
Guides
Sphenophorus callosus
Southern Corn Billbug
Sphenophorus callosus, commonly known as the southern corn billbug, is a weevil species in the family Dryophthoridae (formerly placed in Curculionidae) that is a significant agricultural pest of corn in eastern North Carolina. Historically widespread and damaging throughout the southeastern United States, its impact has become regionally restricted due to modern management practices, particularly insecticidal seed treatments. The species is univoltine with a narrow host range, reproducing primarily on corn and yellow nutsedge.
Sphenophorus chittendeni
Sphenophorus chittendeni is a species of billbug weevil in the family Dryophthoridae, described by Blatchley and Leng in 1916. The species belongs to a genus of economically important weevils that damage various crops through larval feeding on plant roots and crowns. Like other Sphenophorus species, it likely exhibits the typical billbug life cycle involving stem-boring larvae and root-feeding development stages, though specific biological details for this species remain poorly documented.
Sphenophorus cicatristriatus
Rocky Mountain billbug, Denver billbug
Sphenophorus cicatristriatus, commonly known as the Rocky Mountain billbug or Denver billbug, is a weevil species in the family Dryophthoridae. It is one of the largest billbug species affecting turfgrass in North America, with adults measuring 10–12 mm in length. The species occurs in the western United States and Canada, particularly in the Rocky Mountain region and Intermountain West. Like other billbugs, it damages turfgrass through larval feeding on roots and crowns, as well as adult feeding on leaves. It is considered a significant pest of turfgrass in its range.
Sphenophorus coesifrons
oblite billbug
Sphenophorus coesifrons, commonly known as the oblite billbug, is a small weevil species in the family Dryophthoridae. It is distributed across North America from Maryland and Wisconsin south to the Gulf Coast and Arizona. The species has been documented as a pest of corn along the Gulf Coast, where it was considered extremely destructive to first and second plantings. It has also been reared on timothy in Illinois and Michigan. The species closely resembles the bluegrass billbug (Sphenophorus parvulus) but can be distinguished by morphological differences in the beak.
Sphenophorus costicollis
Sphenophorus costicollis is a species of weevil in the family Dryophthoridae, first described by Chittenden in 1919. It belongs to the genus Sphenophorus, commonly known as billbugs, which contains multiple species that are significant agricultural pests. The species is distributed in North America and includes two recognized subspecies: S. costicollis callosipennis and the nominate S. costicollis costicollis.
Sphenophorus costipennis
Sedge Billbug Weevil
Sphenophorus costipennis is a species of weevil in the family Dryophthoridae, commonly known as the Sedge Billbug Weevil. It is distributed across North America, with records from Canadian provinces including Alberta, British Columbia, and Manitoba. As a member of the genus Sphenophorus, it belongs to a group of weevils commonly referred to as billbugs, which are associated with various grass and sedge host plants. The species was described by Horn in 1873.
Sphenophorus crenatus
Sphenophorus crenatus is a weevil species described by Gyllenhal in 1838. It is currently treated as an ambiguous synonym of Cactophagus crenatus in modern taxonomic databases. The species belongs to the family Dryophthoridae, a group formerly classified within Curculionidae. Like other members of the genus Sphenophorus (billbugs), it is presumed to have a weevil body plan with an elongated snout, though specific morphological details for this particular species are not well documented in available sources.
Sphenophorus deficiens
Sphenophorus deficiens is a species of billbug weevil described by Chittenden in 1920. Like other members of the genus Sphenophorus, it belongs to the family Dryophthoridae (formerly placed in Curculionidae). The genus Sphenophorus comprises multiple weevil species associated with grasses and sedges, with several species being economically significant agricultural pests. Information specific to S. deficiens is sparse in the available literature.
Sphenophorus gagatinus
Sphenophorus gagatinus is a species of weevil in the family Dryophthoridae, first described by Gyllenhal in 1838. It is one of numerous billbug species within the genus Sphenophorus, a group of economically significant turfgrass and crop pests. The species occurs in North America, though specific details regarding its biology, host associations, and pest status remain poorly documented compared to better-known congeners such as S. parvulus and S. callosus.
Sphenophorus gentilis
Sphenophorus gentilis is a species of weevil in the family Dryophthoridae. It is native to North America. As a member of the genus Sphenophorus, it is commonly known as a billbug. Specific ecological and biological details for this species remain poorly documented in available literature.
Sphenophorus germari
Sphenophorus germari is a weevil species in the family Dryophthoridae (formerly Curculionidae), first described by Horn in 1873. It is found in North America and belongs to a genus containing multiple agricultural pest species known as billbugs. Like other Sphenophorus species, it likely exhibits the typical billbug life cycle with larvae developing within plant stems and roots, though specific biological details for this species remain poorly documented.
Sphenophorus graminis
Sphenophorus graminis is a species of weevil (Coleoptera: Dryophthoridae) found in North America. It is one of multiple billbug species within the genus Sphenophorus, a group of weevils that develop within plant stems and roots. Like related billbug species, adults and larvae feed on grasses, though specific details of its biology and host associations are not well documented in available sources.
Sphenophorus hoegbergii
Sphenophorus hoegbergii is a species of billbug weevil in the family Dryophthoridae, originally described by Boheman in 1845. It is recorded from North America, though specific details regarding its biology, host associations, and economic significance remain poorly documented in the available literature. The species belongs to a genus containing numerous agricultural pests, but direct evidence linking this particular species to crop damage is absent.
Sphenophorus holosericus
Sphenophorus holosericus is a species of weevil in the family Dryophthoridae, described by Chittenden in 1924. It belongs to the genus Sphenophorus, a group commonly known as billbugs, which are recognized as significant pests of turfgrass and agricultural crops. The species is recorded from North America. As with other members of this genus, adults are characterized by elongated snouts and larvae develop within plant stems and roots.
Sphenophorus imus
Sphenophorus imus is a species of weevil in the family Dryophthoridae, first described by Gyllenhal in 1838. It belongs to a genus containing numerous species commonly known as billbugs, many of which are significant agricultural pests. The species is recorded from North America, though specific details regarding its biology, host associations, and economic importance remain poorly documented compared to congeners such as S. parvulus, S. callosus, and S. levis.
Sphenophorus incongruus
Sphenophorus incongruus is a weevil species in the family Dryophthoridae, first described by Chittenden in 1905. The species belongs to the genus Sphenophorus, commonly known as billbugs, which contains numerous turfgrass and crop pests. Records indicate presence in North America, specifically in the Canadian provinces of Ontario and Québec. Like other Sphenophorus species, it likely possesses the elongated snout typical of weevils and shares the general billbug body plan, though specific distinguishing features from congeners remain poorly documented in available literature.
Sphenophorus latinasus
Sphenophorus latinasus is a weevil species in the family Dryophthoridae, occurring in North America. The genus Sphenophorus comprises billbugs, a group of weevils whose larvae develop within plant stems and roots. Little specific information has been published regarding the biology or economic importance of this particular species compared to better-studied congeners such as S. levis (sugarcane weevil) and S. callosus (southern corn billbug).
Sphenophorus maidis
Maize Billbug
Sphenophorus maidis, commonly known as the maize billbug, is a weevil species in the family Curculionidae. It is found in North America and is associated with maize (corn) as a host plant. The species belongs to a genus of billbugs that are significant agricultural pests, with larvae that bore into plant stems and roots causing substantial damage to crops.
Sphenophorus marinus
Sphenophorus marinus is a species of weevil in the family Dryophthoridae. It was described by Chittenden in 1905 and is known to occur in North America. The species belongs to the genus Sphenophorus, which includes multiple billbug species that are significant pests of turfgrass and agricultural crops. Specific biological details for S. marinus remain poorly documented in available literature.
Sphenophorus melanocephalus
Uneven Billbug
Sphenophorus melanocephalus is a weevil species in the family Dryophthoridae, commonly known as the Uneven Billbug. It is native to North America with confirmed records from Ontario, Québec, and Vermont. The species has a notable taxonomic history: because type specimens were unavailable, the name was once misapplied to Sphenophorus nubilus. Like other billbugs in the genus, it is associated with grass-feeding habits, though species-specific details remain limited.
Sphenophorus minimus
lesser billbug
Sphenophorus minimus, commonly known as the lesser billbug, is a species of weevil in the family Dryophthoridae. It is native to North America, with documented records from Canada (Ontario, Québec) and the United States (Vermont). As a member of the genus Sphenophorus, it belongs to a group of billbugs that are significant turfgrass pests, though specific details about its biology and economic impact remain limited compared to better-studied congeners.
Sphenophorus mormon
Mormon Billbug Weevil
Sphenophorus mormon is a weevil species in the family Dryophthoridae, distributed across North America including the Canadian provinces of Alberta, British Columbia, and Manitoba. The species was described by Chittenden in 1904. Commonly known as the Mormon Billbug Weevil, it belongs to a genus of billbug weevils associated with grasses and sedges. Available information on this species is limited, with only two documented observations on iNaturalist.
Sphenophorus necydaloides
Sphenophorus necydaloides is a species of weevil in the family Dryophthoridae, distributed in North America. Like other members of the genus Sphenophorus, it is a billbug weevil. The species was described by Fabricius in 1802. Beyond its taxonomic placement and geographic distribution, specific details about its biology, ecology, and economic importance remain poorly documented in available sources.
Sphenophorus parvulus
bluegrass billbug
Sphenophorus parvulus, commonly known as the bluegrass billbug, is a small weevil native to North America and a significant pest of turfgrass, particularly Kentucky bluegrass. Adults measure approximately 5–7 mm in length, with a distinctive long, downward-curving rostrum comprising about one-third of the body length. The species was described by Swedish entomologist Leonard Gyllenhaal in 1838, with the specific epithet derived from Latin 'parvus' meaning small. It is one of at least ten Sphenophorus species that damage turfgrass in the United States and is frequently studied in the context of integrated pest management and host plant resistance.
Sphenophorus pertinax
Sphenophorus pertinax is a species of billbug weevil in the family Dryophthoridae. It is one of approximately 150 species in the genus Sphenophorus, a group of weevils commonly known as billbugs that are associated with grasses and sedges. The species is found in North America, though specific details about its biology and economic importance remain poorly documented compared to better-studied congeners such as the bluegrass billbug (S. parvulus) and southern corn billbug (S. callosus).
Sphenophorus phoeniciensis
Phoenix Billbug
Sphenophorus phoeniciensis, commonly known as the Phoenix billbug, is a weevil species in the family Dryophthoridae. It is one of at least ten billbug species that damage turfgrass in the United States. The species is distinguished from similar billbugs primarily by its size, measuring 6–8 mm in length. It is found in North America, particularly in western regions of the United States.
Sphenophorus pontederiae
Sphenophorus pontederiae is a species of weevil in the family Dryophthoridae (formerly placed in Curculionidae), described by Chittenden in 1905. The species is found in North America. Like other members of the genus Sphenophorus, it is commonly referred to as a billbug or snout beetle, though specific ecological details remain poorly documented.
Sphenophorus probably-unnamed
Sphenophorus probably-unnamed is a billbug species within the weevil genus Sphenophorus, a group of turfgrass and agricultural pests whose larvae are notoriously difficult to identify morphologically. The specific epithet "probably-unnamed" indicates this taxon represents a distinct species that has not yet been formally described or named in the scientific literature. Like other Sphenophorus species, it is presumed to have a life cycle involving larval development within plant tissues and adult feeding on vegetation, though specific biological details for this undescribed taxon remain undocumented.
Sphenophorus robustus
Corn Billbug
Sphenophorus robustus is a species of billbug weevil in the family Dryophthoridae. It is distributed across North America, with records from Canada (British Columbia, Manitoba, Ontario) and the United States. The species belongs to a genus containing several economically significant agricultural pests, though specific information about this species' biology remains limited. Two subspecies are recognized: S. r. robustus and S. r. rectistriatus.
Sphenophorus sayi
Sphenophorus sayi is a weevil species in the family Dryophthoridae (formerly treated as Curculionidae), described by Gyllenhal in 1838. The genus Sphenophorus contains billbugs, several of which are significant agricultural pests. Related species such as Sphenophorus callosus (southern corn billbug) and Sphenophorus levis (sugarcane weevil) are well-documented crop pests, but specific information on S. sayi remains sparse. The species is recorded from North America including British Columbia, Canada.
Sphenophorus scoparius
Sphenophorus scoparius is a weevil species in the family Dryophthoridae, found in North America. Like other members of the genus Sphenophorus, it is commonly referred to as a billbug. Species in this genus are associated with turfgrass and agricultural habitats, though specific ecological details for S. scoparius remain poorly documented in published literature.
Sphenophorus simplex
Simple Billbug Weevil
Sphenophorus simplex is a species of weevil in the family Dryophthoridae. It is found in North America. The species is commonly known as the Simple Billbug Weevil. As a member of the genus Sphenophorus, it belongs to a group of weevils commonly referred to as billbugs, which are associated with grasses and sedges.
Sphenophorus striatipennis
Groove-winged Billbug Weevil
Sphenophorus striatipennis is a billbug weevil species in the family Dryophthoridae, found in North America. The common name "Groove-winged Billbug Weevil" refers to distinctive striations on the wing covers. As a member of the genus Sphenophorus, it belongs to a complex of weevil species that develop within grass stems and roots, though specific biological details for this species remain limited in available literature.
Sphenophorus subulatus
Sphenophorus subulatus is a species of weevil in the family Dryophthoridae (formerly placed in Curculionidae). It is native to North America. Like other members of the genus Sphenophorus, it is commonly referred to as a billbug. The species was described by Chittenden in 1905.
Sphenophorus tardus
tardy billbug
Sphenophorus tardus is a species of weevil (billbug) in the family Dryophthoridae, first described by Fall in 1901. It is found in North America. Like other members of the genus Sphenophorus, it is likely associated with turfgrass or agricultural habitats, though specific ecological details for this species remain poorly documented. The species name 'tardus' (Latin for 'slow' or 'late') may refer to aspects of its phenology or behavior.
Sphenophorus velutinus
Sphenophorus velutinus is a species of weevil in the family Dryophthoridae. It occurs in North America. This species is part of the genus Sphenophorus, which includes several economically significant billbug species that feed on grasses and agricultural crops.
Sphenophorus venatus
hunting billbug
Sphenophorus venatus, commonly known as the hunting billbug, is a weevil species in the family Dryophthoridae. It is native to North and Central America, with established populations in parts of Europe including Spain and Corsica. The species is a documented pest of turfgrasses and forage crops, with different subspecies showing host preferences: S. v. vestitus affects zoysiagrass, while S. v. confluens has been recorded as a pest of orchardgrass. Adults and larvae feed on grasses, with larvae causing damage by boring into stems and roots. The species uses volatile organic compounds from host plants and conspecifics for dispersal and host-finding, with males attracted to Cynodon dactylon and females attracted to male conspecifics.
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Sphenophorus venatus confluens is a subspecies of billbug weevil in the family Curculionidae. It has been identified as a pest of orchardgrass (Dactylis glomerata), with its biology and life history documented as a newly recognized agricultural pest species. Like other billbugs in the genus Sphenophorus, it is part of a complex of weevil species that feed within grasses and can cause significant damage to turf and forage crops.
Sphenophorus venatus glyceriae
Sphenophorus venatus glyceriae is a subspecies of billbug weevil in the family Curculionidae. Billbugs (Sphenophorus spp.) are significant turfgrass and agricultural pests whose larvae feed internally on plant stems and roots. This subspecies belongs to a complex of closely related taxa that are difficult to distinguish morphologically, particularly as larvae.
Sphenophorus venatus venatus
hunting billbug
Sphenophorus venatus venatus is a subspecies of hunting billbug, a weevil in the family Dryophthoridae. It is widely distributed across North America and has been documented in Middle America, Spain, and Corsica. This subspecies is associated with grass habitats, particularly Cynodon dactylon (bermudagrass), and exhibits chemically-mediated host and mate recognition behaviors. Males are attracted to host-plant volatiles and conspecific cues, while females respond to male conspecifics. The species uses both volatile and contact chemical cues for orientation and recognition.
Sphenophorus venatus vestitus
Hunting Billbug
Sphenophorus venatus vestitus, commonly known as the hunting billbug, is a subspecies of weevil in the family Curculionidae. It is a significant pest of zoysiagrass (Zoysia spp.) and other turfgrass systems. Adults are medium-sized weevils, measuring 7-9 mm in length, and can be distinguished from related billbug species by size and morphological features. The species has a documented distribution across North America, Middle America, and parts of Europe including Spain and Corsica.
Sphenophorus villosiventris
Sphenophorus villosiventris is a species of weevil in the family Dryophthoridae. It is found in North America, with records from the United States and Canada. The species was described by Chittenden in 1905. Like other members of the genus Sphenophorus, it is commonly referred to as a billbug.
Sphenophorus vomerinus
Narrow-nosed Billbug Weevil
Sphenophorus vomerinus is a species of weevil in the family Dryophthoridae, distributed across North America. It belongs to the genus Sphenophorus, commonly known as billbugs, which are recognized as significant pests of turfgrass and agricultural crops. The species was described by LeConte in 1858.
Sphenophorus zeae
Timothy billbug
Sphenophorus zeae, commonly known as the Timothy billbug, is a true weevil species in the family Dryophthoridae. It is native to North America, with documented occurrences in Canada (New Brunswick, Nova Scotia, Ontario) and the United States. As a member of the genus Sphenophorus, it shares the characteristic billbug morphology and life history involving larval development within plant stems and roots. The species is associated with grasses, including timothy (Phleum pratense), which provides its common name.
Stenancylus
Stenancylus is a genus of true weevils (Curculionidae) established by Casey in 1892. The genus contains nine described species, most described by Wibmer & O'Brien in 1986. Species are distributed across the Americas, with records from Panama, Colombia, and the United States. The genus name derives from Greek roots suggesting narrow or slender form.
Stenobaris
Stenobaris is a genus of flower weevils in the family Curculionidae, established by Martin L. Linell in 1897. The genus is monotypic, containing only one described species: Stenobaris avicenniae. As a member of Curculionidae, it possesses the characteristic elongated snout (rostrum) typical of weevils. The genus is poorly documented in scientific literature, with limited biological or ecological information available.
Stenopterapion
Stenopterapion is a genus of weevils in the family Brentidae, established by Bokor in 1923. It contains approximately six described species distributed primarily in Europe. The genus is characterized by a pear-shaped body form typical of many brentid weevils. Species within this genus are relatively small and associated with herbaceous vegetation.
Stenoptochus
Stenoptochus is a genus of broad-nosed weevils in the family Curculionidae, established by Casey in 1888. The genus contains at least two described species: S. inconstans and S. vanduzeei. These weevils belong to the subfamily Entiminae and tribe Peritelini. As with other broad-nosed weevils, they possess a short, broad rostrum rather than the elongated snout characteristic of many curculionids.
Stenoscelis
Stenoscelis is a genus of weevils (family Curculionidae) comprising at least 30 described species. The genus was established by Thomas Vernon Wollaston in 1861. These beetles are classified among snout and bark beetles, placing them within the diverse weevil fauna. Species in this genus occur across multiple continents with documented records from North America and Europe.
Stenoscelis brevis
snout beetle, bark beetle
Stenoscelis brevis is a species of weevil in the family Curculionidae, first described by Boheman in 1845. The species belongs to a genus of snout or bark beetles distributed in North America. Records indicate presence across eastern Canada including New Brunswick, Nova Scotia, Ontario, and Québec.