Vector
Guides
Psammotettix
Psammotettix is a genus of leafhoppers in family Cicadellidae, tribe Paralimnini. Species occur in Eurasia and North America. Several species are significant agricultural pests as vectors of wheat viruses, including Wheat dwarf virus and Wheat yellow striate virus. The genus includes both generalist and halophilic species.
Pseudolynchia canariensis
pigeon louse fly, pigeon fly
Pseudolynchia canariensis is an obligate ectoparasitic louse fly in the family Hippoboscidae that specializes on pigeons and doves (Columbidae). It is a significant vector of Haemoproteus columbae, the causative agent of pigeon malaria, serving as the definitive host where sexual reproduction of the parasite occurs. The species exhibits adenotrophic viviparity, producing one prepupa at a time that is deposited in the host's nest or roosting site. Both sexes feed exclusively on blood. The fly has been documented in numerous regions worldwide, particularly where domestic pigeons are kept, and shows limited ability to survive on human blood.
Pseudopityophthorus
oak bark beetles
A genus of bark and ambrosia beetles in the family Curculionidae, comprising more than 30 described species distributed primarily in North and Central America. Species in this genus are strongly associated with oak trees (Quercus spp.) and have been investigated as potential vectors of forest pathogens, including the oak wilt fungus Ceratocystis fagacearum and the canker-causing fungus Geosmithia pallida. Some species exhibit phoretic behavior and form associations with other organisms including mites and nematodes.
Pseudopityophthorus minutissimus
oak bark beetle
Pseudopityophthorus minutissimus, commonly known as the oak bark beetle, is a small bark beetle in the family Curculionidae. It is native to North America and breeds in oak species (Quercus). The species has been investigated as a potential vector of the oak wilt fungus Ceratocystis fagacearum, though evidence suggests it plays a minor role in long-distance pathogen transmission compared to other insects.
Pseudopityophthorus pubipennis
western oak bark beetle
Pseudopityophthorus pubipennis, the western oak bark beetle, is a small bark beetle in the family Curculionidae. The species has been identified as a vector of Geosmithia pallida, the causal agent of foamy bark canker disease on coast live oak (Quercus agrifolia) in California. Previously considered a secondary agent, this native beetle is now associated with significant tree decline and mortality in urban landscapes across multiple California counties.
Psorophora
gallinipper
Psorophora is a genus of large mosquitoes in the subfamily Culicinae, tribe Aedini, described by Robineau-Desvoidy in 1827. The genus comprises approximately 50 species distributed across the Americas, with three recognized subgenera: Psorophora, Janthinosoma, and Grabhamia. Several species, notably Psorophora ciliata and P. ferox, are among the largest mosquitoes in the world and are known for aggressive biting behavior. Larvae of some species are obligate predators with specialized anatomical adaptations for capturing prey.
Psorophora columbiae
dark ricefield mosquito, glades mosquito
Psorophora columbiae is a large, aggressive mosquito species native to North America, commonly known as the dark ricefield mosquito or glades mosquito. It is notorious for its capacity for massive population explosions following hurricane and flooding events, which have resulted in documented livestock fatalities through exsanguination. The species is a significant pest of mammals, including cattle, horses, sheep, and deer, and is considered difficult to repel with standard insect repellents.
Psorophora ferox
White-footed Woods Mosquito
Psorophora ferox is a medium-sized floodplain mosquito native to the Americas, commonly known as the white-footed woods mosquito. It inhabits wet woodlands and temporary pools, with eggs requiring flooding to hatch. The species has expanded its range northward in recent years, becoming increasingly dominant in floodplain mosquito communities in the northeastern United States. Adults are aggressive biters with painful bites and are active during both day and night.
Psorophora howardii
Howard's Gallinipper
Psorophora howardii is a large, aggressive floodwater mosquito native to tropical and subtropical regions of the Americas. The species was described by Daniel William Coquillett in 1901. Adult females are persistent biters that attack humans and medium to large mammals at any time of day, with a proboscis strong enough to pierce through multiple layers of clothing. Larvae are predaceous, feeding on other mosquito larvae in temporary aquatic habitats. The species has demonstrated recent northward range expansion, with the first Canadian record documented in 2024 in southern Ontario.
Psylloidea
jumping plant lice, psyllids, psylloids
Psylloidea is a superfamily of true bugs (Hemiptera) in the suborder Sternorrhyncha, commonly known as jumping plant lice or psyllids. The group comprises approximately 3,800 described species classified into seven extant families: Aphalaridae, Calophyidae, Carsidaridae, Liviidae, Mastigimatidae, Psyllidae, and Triozidae. Fossil evidence indicates the superfamily originated in the Early Jurassic, though modern families do not appear until the Eocene. Psyllids are obligate phloem-feeders, typically exhibiting high host specificity with most species restricted to a single plant species or closely related group. Many species are economically significant agricultural pests, notably as vectors of bacterial and viral plant pathogens.
Pulex
human flea (for P. irritans)
Pulex is a genus of fleas in the family Pulicidae, established by Linnaeus in 1758. The genus comprises six to seven recognized species, with Pulex irritans (the human flea) being the most notable and widespread. The remaining species are restricted to the Nearctic and Neotropical realms. Members of this genus are laterally compressed, wingless ectoparasites adapted for blood-feeding on mammals.
Pulex irritans
Human Flea, House Flea
Pulex irritans is a cosmopolitan flea species commonly known as the human flea. Despite its name, it has a broad host range including humans, dogs, cats, livestock, and various wild mammals. The species is thought to have originated in South America, possibly associated with guinea pigs or peccaries as original hosts. It is one of only six species in the genus Pulex, with the other five restricted to Nearctic and Neotropical regions. P. irritans has been found in human archaeological sediments dating back thousands of years in Europe and Greenland, demonstrating its long association with human populations. The species is medically significant as a potential vector of plague (Yersinia pestis), murine typhus, trench fever (Bartonella quintana), flea-borne spotted fever (Rickettsia felis), and the tapeworm Dipylidium caninum.
Pulicidae
Common Fleas
Pulicidae is a family of fleas (Siphonaptera) containing 181 species in 27 genera. Members are wingless, laterally compressed ectoparasites of mammals with exceptional jumping ability enabled by the elastic protein resilin. The family includes significant pests such as the cat flea (*Ctenocephalides felis*), dog flea (*C. canis*), and human flea (*Pulex irritans*), which are vectors of disease and parasites.
Pycnoscelus
burrowing cockroaches
Pycnoscelus is a genus of burrowing cockroaches in the family Blaberidae, containing approximately 15 described species. The genus is distributed across India, China, Southeast Asia, and has been introduced to other regions including the Americas. The most studied species, Pycnoscelus surinamensis (Surinam cockroach), is notable for being parthenogenetic and serving as an intermediate host for poultry parasites.
Rhipicephalus sanguineus
Brown Dog Tick, Kennel Tick, Pantropical Dog Tick
Rhipicephalus sanguineus is a hard tick species distinguished by its ability to complete its entire life cycle indoors, a trait unusual among ixodid ticks. It is found worldwide but is most common in warmer climates. The species is a three-host tick that feeds on a variety of mammals, with dogs serving as the preferred host in the United States. It is a significant vector of multiple pathogens affecting dogs and humans, including Ehrlichia canis, Babesia canis, Rickettsia rickettsii, and Rickettsia conorii.
Rhopalosiphum nymphaeae
waterlily aphid, water lily aphid
Rhopalosiphum nymphaeae, the waterlily aphid, is a cosmopolitan, host-alternating aphid species with a unique ability to thrive in both aquatic and terrestrial environments. It is a significant agricultural pest that damages crops through direct herbivory and as a vector for plant viruses, particularly affecting Prunus spp. fruits and various aquatic plants. The species exhibits complex life history traits including rapid population growth (intrinsic rate of increase 0.315 day⁻¹, doubling time 2.2 days) and strong host preferences among aquatic vegetation.
Rhynchophorus palmarum
South American palm weevil, American palm weevil, black palm weevil
Rhynchophorus palmarum is a large black palm weevil native to the Neotropics that has become a destructive invasive pest in southern California. Adults are attracted to volatile compounds released by injured palms, where females lay eggs in the crown. Larvae burrow into the palm heart, causing direct damage and creating wounds that facilitate secondary infections. The weevil is the primary vector of the red ring nematode (Bursaphelenchus cocophilus), which causes lethal red ring disease in palms. In its native range, larvae have been consumed as food for centuries.
Saccharosydne saccharivora
West Indian Canefly, West Indian Sugarcane Fulgorid
Saccharosydne saccharivora is a delphacid planthopper and major pest of sugarcane with a 6½–7 week life cycle. It has been documented as a vector of sugarcane yellow leaf phytoplasma, the first confirmed phytoplasma transmission by this species. Population dynamics in Jamaica showed epidemic versus endemic patterns, with generation segregation and synchronization occurring in epidemic areas due to parasitoid pressure. Outbreaks require plant cane under favorable climatic and agricultural conditions.
Saccharosydnini
Saccharosydnini is a tribe of delphacid planthoppers (Hemiptera: Fulgoromorpha: Delphacidae) established by Vilbaste in 1968. The tribe includes at least one new genus, Lacertina, described from Argentina with distinctive dorsoventrally flattened morphology. Some members are associated with sugarcane and serve as vectors of plant pathogens.
Salmincola californiensis
gill lice, gill maggot, salmon gill maggot
Salmincola californiensis is a freshwater parasitic copepod in the family Lernaeopodidae that infests the gills and branchial cavities of salmonid fishes, particularly species of Oncorhynchus. Native to the Pacific Rim and now established in introduced ranges including Japan and Colorado, this parasite has become a significant concern for fisheries management and salmonid conservation. Recent research has documented a previously unrecognized naupliar stage and demonstrated strong temperature-dependence in egg development and copepodid survival, with implications for disease management under climate change scenarios.
Scaphoideus
Scaphoideus is a genus of leafhoppers in the family Cicadellidae, subfamily Deltocephalinae. The genus is best known for Scaphoideus titanus, the American grapevine leafhopper, which is the primary vector of Flavescence dorée phytoplasma, a serious disease of grapevines in European vineyards. Members of this genus are small, plant-feeding insects with piercing-sucking mouthparts. The genus has a Nearctic origin, with S. titanus introduced to Europe approximately 150 years ago, likely via American rootstock material.
Scaphoideus luteolus
White-banded Elm Leafhopper
Scaphoideus luteolus is a phloem sap-feeding leafhopper native to the eastern United States and the only confirmed vector of Candidatus Phytoplasma ulmi (CPu), the causative agent of elm phytoplasma disease. The species does not cause direct damage through feeding but transmits this pathogen to elm trees (Ulmus spp.), resulting in heavy damage to North American elm populations. It has three developmental stages—egg, nymph, and adult—with overwintering occurring in the egg stage. Both nymphs and adults can acquire and transmit CPu and remain infective for life.
Scaphoideus titanus
American grapevine leafhopper
Scaphoideus titanus is a leafhopper native to North America that has become a major agricultural pest in Europe. Introduced accidentally around 150 years ago, likely via American rootstock material, it now acts as the primary vector of the grapevine phytoplasma disease Flavescence dorée (FD). The species exhibits unique vibrational communication for mating, with males producing substrate-borne signals detected by females. This trait has been exploited for developing mating disruption control methods. In Europe, the species is monophagous on cultivated grapevines, whereas in North America it feeds on various Vitaceae including wild grapevines.
Scaphytopius
leafhopper
Scaphytopius is a large genus of leafhoppers (family Cicadellidae) containing at least 170 described species. The genus was established by Ball in 1931 and is classified in the subfamily Deltocephalinae and tribe Scaphytopiini. Multiple species have been documented as vectors of plant pathogens, including phytoplasmas affecting citrus and peach. The subgenus Cloanthanus, revised by Hepner in 1947, is poorly represented in Canada compared to more southerly distributions in North America.
Scaphytopius acutus
Sharp-nosed Leafhopper
Scaphytopius acutus is a leafhopper species in the family Cicadellidae, commonly known as the Sharp-nosed Leafhopper. It serves as a documented vector of Peach X-Disease, a phytoplasma pathogen affecting stone fruit cultivation. The species has been studied for its ecological role in bridging wild host plant reservoirs and cultivated peach orchards, with seasonal dispersal patterns between these habitats. It possesses a nationwide distribution across the United States.
Scaphytopius nr-majestus
Scaphytopius nr-majestus is a leafhopper in the family Cicadellidae, tribe Scaphytopiini. The 'nr-' prefix indicates a near-reference designation, signifying that specimens closely resemble S. majestus but may not be conclusively identified to that species. Members of this genus are generally associated with woody plants and are known vectors of plant pathogens. Specific biological details for this near-reference taxon remain limited.
Schizaphis graminum
greenbug, wheat aphid, common wheat-louse
Schizaphis graminum, commonly known as the greenbug or wheat aphid, is a small aphid species in the family Aphididae. Native to the Palaearctic region, it has been introduced worldwide and is a significant pest of cereal crops, particularly wheat and sorghum. The species exhibits wing dimorphism, with wingless forms predominating early in the season and winged forms developing under crowded conditions to disperse to new hosts. It causes direct damage through feeding and toxin injection, and indirect damage as a vector of multiple plant viruses.
Scolytus
bark beetles, elm bark beetles
Scolytus is a genus of bark beetles in the subfamily Scolytinae, family Curculionidae. Multiple species within this genus are significant forest pests, particularly as vectors of Dutch elm disease. The genus includes both European and North American species with documented roles in tree mortality. Some species exhibit chemically-mediated aggregation behaviors involving pheromone communication.
Scolytus multistriatus
European elm bark beetle, smaller European elm bark beetle
Scolytus multistriatus is a small bark beetle in the subfamily Scolytinae that infests elm trees (Ulmus spp.). It is a known vector of Dutch elm disease caused by the fungus Ophiostoma ulmi, though it is less effective than the related Scolytus scolytus. The species uses chemical cues including vanillin and syringaldehyde to locate host trees during oviposition. It has been introduced to North America and other regions beyond its native European range, where it contributes to elm decline through disease transmission and direct tree damage.
Scolytus rugulosus
shothole borer, fruit tree bark beetle, apple tree beetle
Scolytus rugulosus is a bark beetle in the family Curculionidae, commonly known as the shothole borer or apple tree beetle. The species is native to Europe and has been introduced to the Americas and North Asia. It is a pest of stone and pome fruit trees in the family Rosaceae, where it tunnels beneath the bark to complete its life cycle.
Scolytus schevyrewi
Banded Elm Bark Beetle
Scolytus schevyrewi is a small bark beetle native to Asia that has become invasive in North America. It is a documented vector of Dutch elm disease pathogens (Ophiostoma ulmi and O. novo-ulmi). The species exhibits strong attraction to stressed or weakened host trees, particularly Ulmus pumila, and has been observed displacing both native elm bark beetles and the earlier-introduced smaller European elm bark beetle (S. multistriatus) in North America. In its native range, it also causes significant damage to fruit trees including apricot.
Simuliidae
black flies, buffalo gnats, turkey gnats, white socks
Black flies are small, humpbacked flies in the family Simuliidae, comprising over 2,200 formally described species. Only females bite, using serrated mandibles to slash skin and lap pooled blood for egg development. They are vectors of Leucocytozoon parasites causing leucocytozoonosis in birds and, in some regions, filarial worms causing river blindness in humans. Larvae develop exclusively in flowing freshwater, attaching to submerged substrates with specialized hooks.
Simulium clarum
black fly
Simulium clarum is a species of black fly in the family Simuliidae. The genus Simulium is the largest and most widespread genus of black flies, with species occurring across diverse habitats. Black flies are small, blood-feeding dipterans whose larvae develop in flowing water. Female black flies require blood meals for egg development and are known vectors of parasites affecting birds and mammals.
Simulium longithallum
black fly
Simulium longithallum is a species of black fly in the family Simuliidae, described by Díaz Nájera and Vulcano in 1962. Black flies in this genus are small, blood-feeding dipterans with aquatic larval and pupal stages. Females require blood meals for egg development, while males do not feed on blood. The species is part of a diverse genus containing numerous vectors of disease agents affecting birds and mammals.
Simulium trivittatum
black fly
Simulium trivittatum is a species of black fly in the family Simuliidae. The species belongs to a genus known for transmitting blood parasites that cause leucocytozoonosis, a malaria-like disease in birds. Like other black flies, females are blood-feeders that use jagged mandibles to tear skin and pool blood. The species was described by Malloch in 1913.
Simulium tuberosum
Twinn's black fly, superfluous black fly, tubercled black fly
Simulium tuberosum is a species of black fly (family Simuliidae) first described by Lundström in 1911. It belongs to the S. tuberosum species group, a cytologically complex assemblage of sibling species distinguished primarily by chromosomal characteristics. The species has been recorded from Norway, Sweden, Alaska, and northeastern North America. Like other black flies, it has aquatic larval and pupal stages and terrestrial adults.
Siphonaptera
fleas, pireler (Turkish)
Siphonaptera (fleas) are small, wingless, holometabolous insects that are obligate ectoparasites of mammals and birds. Adults are 2–5 mm long, bilaterally flattened, and possess enlarged hind legs adapted for jumping. Larvae are legless, worm-like, and feed on organic debris including blood clots and adult flea feces. The order comprises approximately 2,500 described species, with roughly 94% parasitizing mammals and 6% specializing on birds. Some species are significant vectors of human and animal pathogens, including plague, typhus, and tularemia.
Sitobion avenae
English Grain Aphid
Sitobion avenae, the English grain aphid, is a globally distributed pest of cereal crops. It feeds on phloem sap and transmits yellow dwarf viruses to wheat, barley, and oats. Population dynamics are influenced by temperature, water availability, and host plant quality. The species exhibits complex reproductive strategies including both cyclical and obligate parthenogenesis. Management challenges include insecticide resistance, variable biotypes, and climate change impacts on dispersal and adaptation.
Sogatella
white-backed planthopper (for S. furcifera)
Sogatella is a genus of delphacid planthoppers in the family Delphacidae, comprising more than 20 described species. The genus was established by Fennah in 1956. The best-studied species, Sogatella furcifera (white-backed planthopper), is a major agricultural pest of rice across Asia. Members of this genus are characterized by their association with rice and grass hosts, with S. furcifera serving as a vector for plant viruses including southern rice black-streaked dwarf virus.
Sogatella kolophon
Sogatella kolophon is a delphacid planthopper species with a broad pantropical and subtropical distribution spanning Africa, Australia, the Caribbean, Central America, North America, Oceania, South America, and Southern Asia. It is a documented vector of at least two significant plant viruses: Digitaria striate virus (a rhabdovirus) and pangola stunt virus (a fijivirus), both affecting pasture grasses in the genus Digitaria and related grasses. The species has three recognized subspecies: S. k. atlantica, S. k. kolophon, and S. k. meridiana. Immature stages have been described, though detailed biological information remains limited in accessible literature.
Steganinae
Steganinae is the smaller of two subfamilies in the fruit fly family Drosophilidae, established by Hendel in 1917. The subfamily is monophyletic but lacks a single diagnostic morphological character distinguishing it from the larger Drosophilinae. Members display diverse feeding behaviors, with some species exhibiting zoophilic habits unusual for drosophilid flies. The subfamily includes approximately 350 described species across multiple tribes and subtribes, though phylogenetic relationships remain partially unresolved.
Stomoxys
stable flies
Stomoxys is a genus of muscid flies distinguished by its blood-feeding ectoparasitic lifestyle, unusual among the Muscidae. The genus comprises approximately 20 described species, with Stomoxys calcitrans (stable fly) being the most economically significant and widely distributed. Species in this genus are obligate hematophages of mammals, causing substantial livestock losses through blood loss, stress, and disease transmission. Current phylogenetic evidence suggests the genus is paraphyletic.
Stomoxys calcitrans
Stable Fly, Barn Fly, Biting House Fly, Dog Fly, Power Mower Fly, Beach Fly, Lawn-mower Fly
Stomoxys calcitrans, commonly known as the stable fly, is a worldwide pest of livestock and humans. Both sexes are obligate blood-feeders, inflicting painful bites that cause significant economic losses in cattle operations through reduced weight gain and milk production. The species is easily mistaken for the common house fly but distinguished by its piercing-sucking mouthparts. Native to Eurasia and Africa, it has spread globally through human activity.
Tabanidae
Horse and Deer Flies, Horse-flies, Deer flies, Gadflies, Clegs, Green-headed flies
Tabanidae is a family of large, agile true flies comprising approximately 4,455 described species worldwide. Adults are characterized by prominent compound eyes, with females possessing widely separated eyes and males having eyes that nearly touch. Females of most species are blood-feeding ectoparasites of mammals, using blade-like mouthparts to lacerate skin and lap blood for egg development, while males feed exclusively on nectar. Larvae are predaceous and develop in semiaquatic or moist soil habitats. The family includes three well-known subfamilies: Tabaninae (horse flies), Chrysopsinae (deer flies), and Pangoniinae.
Tabanini
horse flies, deer flies
Tabanini is a tribe of horse and deer flies within the family Tabanidae, containing at least 220 described species. Members are robust, medium to large flies with prominent eyes and biting mouthparts. The tribe includes economically significant genera such as Tabanus and Hybomitra, many of which are biting pests of mammals including humans and livestock.
Tabanus
True Horse Flies, Horse Flies
Tabanus is a large genus of biting horse flies in the family Tabanidae, containing hundreds of species distributed worldwide. Females possess scissor-like mouthparts adapted for cutting skin to access blood meals from mammals, including livestock and humans. The genus includes some of the largest horse flies in North America, with species such as Tabanus americanus reaching up to 30 mm in body length. Members of this genus are significant from a veterinary and medical perspective as potential vectors of pathogens including anthrax, worms, and trypanosomes.
Tabanus punctifer
western horse fly, western black horse fly
Tabanus punctifer, commonly known as the western horse fly or western black horse fly, is a large biting fly in the family Tabanidae. It is distinguished from other North American horse flies by its creamy white thorax covered with long hairs and completely black abdomen. Females require blood meals for egg development and bite horses, livestock, and humans. The species is found throughout the southern and western United States.
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.
Tortopus
Tortopus is a genus of burrowing mayflies in the family Polymitarcyidae, restricted to six species based on cladistic revision: T. igaranus, T. circumfluus, T. harrisi, T. zottai, T. bellus, and T. arenales. The genus is characterized by distinctive morphological synapomorphies including female parastyli receptors with long anterior furrows, entirely flattened penes, and nymphs bearing two subapical tubercles on mandibular tusks. Nymphs construct U-shaped tunnels in clay banks, a behavior that renders them difficult to sample with standard aquatic survey methods.
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gerstaeckeri
kissing bug, blood-sucking conenose
Triatoma gerstaeckeri is a triatomine bug (subfamily Triatominae) and a documented vector of Trypanosoma cruzi, the protozoan parasite causing Chagas disease. Adults measure 20–30 mm in length. The species occurs from the southwestern United States (New Mexico, Texas) through northeastern Mexico, occupying dry scrubland habitats with strong associations to woodrat (Neotoma) nests. It exhibits paurometabolous development with five nymphal instars before adulthood. The species is notable for its relatively high T. cruzi infection rates in some populations and its propensity for peridomestic occurrence near human habitation.