Single-generation
Guides
Aclypea bituberosa
Western Spinach Carrion Beetle, Spinach Carrion Beetle
Aclypea bituberosa is a phytophagous carrion beetle in the family Silphidae, notable for being herbivorous rather than necrophagous like most of its relatives. Adults and larvae feed on leaves and shoots of various crop plants, particularly spinach and beets, causing occasional agricultural damage. The species has a single generation per year, overwintering as adults. It is restricted to the northwestern quarter of North America.
Blepharidopterus chlorionis
Honeylocust plant bug, Honey Locust Plant Bug
Blepharidopterus chlorionis, commonly known as the honeylocust plant bug, is a mirid bug and significant pest of honey locust trees (Gleditsia triacanthos). Nymphs and adults feed on expanding leaf tissues using piercing-sucking mouthparts, causing leaves to crinkle, twist, cup, and become stunted. Damage is most severe in spring when new foliage emerges, though trees often produce a second flush of leaves in summer that masks early injury. The species completes one generation per year, with eggs overwintering in twigs and hatching when buds break in spring.
Brochymena lineata
rough stink bug
Brochymena lineata is a species of rough stink bug in the family Pentatomidae, native to North America. Like other members of the genus Brochymena, it exhibits cryptic coloration that mimics lichen-mottled bark, providing effective camouflage against tree trunks. The species was described by Ruckes in 1939. As with congeners, it is not considered an agricultural or household pest.
Cacopsylla negundinis
boxelder psyllid
Cacopsylla negundinis is a psyllid species in the family Psyllidae, order Hemiptera. Like other members of its genus, it is a phloem-feeding insect that uses piercing-sucking mouthparts to extract plant sap. The species is associated with boxelder (Acer negundo) as a host plant. As with related Cacopsylla species, it likely undergoes a single generation per year with overwintering adults.
Catocala umbrosa
Umber Underwing
Catocala umbrosa is a North American underwing moth described by Vernon Antoine Brou Jr. in 2002. Adults are active from April through August with one generation per year. The species occupies a broad geographic range across eastern and central North America.
Catocala unijuga
once-married underwing, once-married underwing moth
Catocala unijuga is a large underwing moth in the family Erebidae, first described by Francis Walker in 1858. Adults are characterized by cryptic forewings that conceal brightly patterned hindwings, a trait shared across the genus Catocala. The species is distributed across northern and western North America, with larvae feeding on poplars and willows. Adults fly from July to September in a single annual generation.
Cingilia
Chain-dotted Geometer
Cingilia is a monotypic genus of geometer moths in the family Geometridae, containing only the species Cingilia catenaria. The genus was erected by Francis Walker in 1862. Its sole species is known by multiple common names including chain-dotted geometer, chain dot geometer, chainspotted geometer, and chain-spotted geometer. The genus is endemic to North America.
Clepsis persicana
white triangle tortrix, green needleworm
Clepsis persicana is a tortricid moth found across North America from Alaska and British Columbia to Newfoundland, south to Virginia, and west to California. Adults are active from June to August, with one generation per year. The species is notable for its broad host plant range, with larvae feeding on both deciduous and coniferous trees.
Cylindrocopturus adspersus
sunflower stem weevil
Cylindrocopturus adspersus, commonly known as the sunflower stem weevil, is a true weevil in the family Curculionidae. Adults are small, grayish-brown beetles with irregular whitish markings, approximately 5 mm in length. The species has a single generation per year, with larvae developing inside sunflower stems and overwintering in chambers hollowed out at the base of the plant. It is recognized as an occasional but potentially serious pest of cultivated sunflowers in North America, capable of reducing yields by up to 50% in heavily infested fields.
Diabrotica virgifera zeae
Mexican corn rootworm
Diabrotica virgifera zeae, the Mexican corn rootworm, is a subspecies of the western corn rootworm complex and a significant agricultural pest of corn (Zea mays) in Mexico and parts of the southern United States. Larvae feed on corn roots, causing damage that can lead to reduced yield, stunting, and plant lodging. Unlike the western corn rootworm subspecies (D. v. virgifera), the Mexican corn rootworm has been documented to damage corn following sorghum rotation in parts of South Central Texas, though this remains rare. Adults feed on corn silks, pollen, and leaves. The species has one generation per year, with eggs laid in soil during summer and fall, hatching the following spring when corn roots become available.
Drepana arcuata
Arched Hooktip Moth, masked birch caterpillar
Drepana arcuata, commonly known as the arched hooktip moth, is a North American species in the hooktip moth family Drepanidae. Adults are active from mid-May through late July, with one generation per year in northern populations. The species is notable for its larvae, which produce sounds through body vibrations, drumming, scraping mouthparts, and specialized anal structures—possibly to communicate and attract other larvae to communal silk shelters.
Endelomyia aethiops
roseslug, rose slug sawfly, roseslug sawfly
Endelomyia aethiops, commonly known as the roseslug or rose slug sawfly, is a species of common sawfly in the family Tenthredinidae. The larvae are significant pests of cultivated roses, causing characteristic skeletonization damage by feeding on leaf tissue between vascular bundles. Adults are small, wasp-like insects that emerge in spring to lay eggs on rose foliage. The species has a single generation per year in most regions, with larvae active primarily in May and June.
Ennomos subsignaria
Elm Spanworm Moth
Ennomos subsignaria is a geometrid moth native to North America, commonly known as the elm spanworm moth. Adults have a wingspan of 35–40 mm and fly from late May to August, with one generation per year. The species is a generalist herbivore whose larvae feed on elm, apple, birch, maple, and oak. Research has documented its clumped intra-tree distribution on mature sycamore maple, with oviposition concentrated on the lower bole and larval development progressing from proximal to distal branches of the lower crown.
Eudeilinia herminiata
Northern Eudeilinia, Northern Eudeilinia Moth
Eudeilinia herminiata is a North American hook-tip moth in the family Drepanidae, described by Guenée in 1857. It ranges across much of the continent from British Columbia to Newfoundland, south to Florida and Texas. The species is associated with deciduous woodland habitats and has a single annual generation with adults active from spring through late summer.
Euxoa aurulenta
Dune Cutworm Moth, dune cutworm
Euxoa aurulenta, the dune cutworm, is a noctuid moth species described by Smith in 1888. It is distributed across central and western North America, with adults active from May to July. The species has a single annual generation and is associated with dune grass habitats. The larvae are suspected to feed on beach grasses including Ammophila breviligulata and Calmovilfa longifolia.
Euxoa cicatricosa
Scarred Dart
Euxoa cicatricosa is a noctuid moth species first described in 1865. Adults have a wingspan of 29–32 mm and are active from August to September. The species has one generation per year and occurs across western North America from southern Canada to the southwestern United States.
Euxoa pleuritica
fawn brown dart
Euxoa pleuritica is a noctuid moth known as the fawn brown dart, found across northern North America from southern Canada through the northern United States. The species is listed as a species of special concern in Connecticut. Adults are active during summer months, with one generation per year. Larvae have been documented feeding on Salsola kali.
Noctua comes
Lesser Yellow Underwing
Noctua comes, the Lesser Yellow Underwing, is a common noctuid moth characterized by brown forewings and bright yellow hindwings with a black terminal band. Adults fly in a single generation from June to October. Larvae are cutworms that feed nocturnally close to the ground, damaging plant stems. The species is native to Britain and Ireland but has been introduced to North America where it can become a crop pest. Its genome of 540.7 Mb has been sequenced and assembled into 32 chromosomal pseudomolecules.
Oncideres cingulata
twig girdler, Eastern Twig Girdler
Oncideres cingulata, commonly known as the twig girdler, is a cerambycid beetle notable for its distinctive reproductive behavior where adult females girdle twigs of host trees to create larval habitat. The beetle is brownish-gray, 13–16 mm in length, with antennae 13–25 mm long. Adults are active in late summer and fall, and females cut through bark and wood of small branches (6–12.7 mm diameter) before laying eggs in the severed portion. Larvae develop within the fallen girdled twigs, feeding on woody tissue, and complete a single yearly generation. The species is economically significant as a pest of pecan plantations and other hardwood trees.
Papilio aristodemus
Schaus' swallowtail, island swallowtail
Papilio aristodemus, commonly known as Schaus' swallowtail or island swallowtail, is a butterfly in the family Papilionidae endemic to southern Florida, the West Indies, and the Bahamas. It is one of North America's most endangered butterflies, with the Florida subspecies (P. a. ponceana, now Heraclides ponceana) listed as endangered since 1984. The species produces a single generation annually with adults active primarily in May and June. Habitat loss from urban development, hurricanes, and mosquito control spraying has caused dramatic population declines, including near-extinction from Hurricane Andrew in 1992.
Parastichtis suspecta
Suspected, Suspected Moth
Parastichtis suspecta, commonly known as the suspected or suspected moth, is a noctuid moth with broad distribution across the Palearctic and North America. Adults are highly variable in coloration, ranging from pale grey to rich reddish-brown or nearly black forms. The species has a single annual generation in Europe, with adults active in late summer. Larvae are specialized feeders on willow species, with a distinctive life cycle involving overwintering as eggs and pupation underground.
Phylloxera caryaeren
pecan phylloxera, pecan stem phylloxera
Phylloxera caryaeren is a small, soft-bodied, gall-forming insect closely related to aphids that attacks pecan trees (Carya illinoinensis). It is considered the most damaging phylloxera species on pecans because it attacks shoots and developing nuts, unlike the pecan leaf phylloxera which only affects foliage. Heavy infestations can reduce current-year yield, impair tree vitality, and reduce production in subsequent years. The insect is sedentary and cannot fly long distances, so infestations spread slowly from tree to tree.
Spanioneura buxi
boxwood psyllid
Spanioneura buxi, commonly known as the boxwood psyllid, is a sap-feeding insect in the family Psyllidae that infests boxwood (Buxus species). The species produces distinctive cupped or curled terminal leaves on host plants, caused by nymphal feeding and wax secretion. It has a single generation per year in temperate regions. The insect is considered a minor pest that causes primarily cosmetic damage, with most boxwood plants recovering without permanent injury.
Speyeria cybele pseudocarpenteri
Great Spangled Fritillary
A subspecies of the great spangled fritillary butterfly found in northern North America. Adults are strong, fast fliers with orange and black patterned wings and distinctive silvery spots on the undersides. Research on the nominate subspecies S. cybele has demonstrated that visual perception is the primary sense used for navigation to suitable habitat patches, with individuals capable of navigating from distances up to 60 meters to island habitats. Larvae feed on violet species and overwinter before completing development in spring.
Sphinx sequoiae
Sequoia Sphinx
Sphinx sequoiae is a small sphinx moth native to western North America, ranging from Oregon through California, Nevada, Utah, Arizona, and into northern Baja California. It is the smallest species in its genus besides Sphinx dollii, with which it is sometimes confused despite occupying different geographic ranges. The species completes one generation annually, with adults active from May through August.