The hemlock woolly adelgid, Adelges tsugae Annand (Hemiptera: Adelgidae), has distinct native and invasive populations in Canada. On the country’s west coast, the adelgid is a native insect that feeds on western hemlock, Tsuga heterophylla (Rafinesque-Schmaltz) Sargent, and mountain hemlock, Tsuga mertensiana (Bongard) Carrière (Pinaceae). In eastern Canada, the adelgid is an invasive species that attacks and kills eastern hemlock, Tsuga canadensis (Linnaeus) Carrière (Pinaceae). We obtained all Canadian records of A. tsugae in institutional and public databases, developed updated range maps and phenologies for the species in British Columbia and eastern Canada, and developed dispersal estimates for populations in Nova Scotia. In British Columbia, A. tsugae’s observed distribution is centred around the Lower Mainland and on Vancouver Island but with populations in the British Columbia Interior and along the Pacific coast that have been poorly explored. In eastern Canada, the adelgid has invaded southern Nova Scotia, portions of the Niagara region in Ontario as far west as Hamilton, and at least one site on the north shore of Lake Ontario. No populations have been found in New Brunswick, Quebec, or Prince Edward Island, Canada. Finally, we estimated the rate of spread in Nova Scotia at 12.6 ± 8.2 to 20.5 ± 27.21 km/year.

This is the first report of the blow fly, Calliphora stelviana (Brauer and Bergenstamm, 1891) (Diptera: Calliphoridae), at low elevation in southern Canada. Specimens were collected using liver-baited traps in autumn 2020 within the Windsor–Essex County region of southwestern Ontario, Canada. Previously, this species has been known to inhabit Alaska and the higher altitudes of Colorado, in the United States of America, and central Saskatchewan and northern Québec, in Canada.

Moths are a hyperdiverse taxon and contribute to important ecosystem services, including herbivory, pollination, and as food for other animals. Artificial light is an effective means by which to attract nocturnal moths for ecological study, but many traditional light-trapping approaches require the use of heavy, lead acid batteries, whereas novel light-emitting diodes (LEDs) use much lighter and energy-efficient lithium-ion batteries. Employing replicated forest stands being used for a longer-term study on the effects of Bacillus thuringiensis subsp. kurstaki (Btk) application, we assessed how traps fitted with either black-light fluorescent (BLF) or LED lights differed in the moth assemblages they attracted. The macromoth assemblages captured by the two light sources differed significantly in their composition, with some species almost exclusively collected by a particular light type. We collected significantly more moths in the BLF traps overall. However, we found a higher diversity of species using the LED light traps but only in the Btk–treated sites. We show that, although these lights appear to attract significantly different species assemblages, LEDs represent an effective, efficient, and environmentally safer approach for attracting macromoths. More empirical studies will help elucidate which species are most attracted to various light sources and if broader phylogenetic patterns exist.

We report the first observation of the Dorantes longtail, Thorybes dorantes (Stoll, 1790) (Lepidoptera: Hesperiidae), in Canada. On 16 April 2023, a single adult was observed on the northwest shore of Lake Ontario, in Toronto, Ontario, Canada. The observation represents a 1500- to 2000-km disjunction from the species’ nearest known populations in North America. After considering several scenarios that could explain the occurrence of the Dorantes longtail in Canada, the most likely explanation is that the observed individual came in on produce through the Ontario Food Terminal, Etobicoke, Ontario, providing another example of the constant pressure of species introductions to the region.

Rising atmospheric carbon dioxide (CO2) concentrations are a major driver of climate change, posing a significant challenge to global ecosystem functions. This challenge is compounded by the potential effects of elevated CO2 on forest pest insects like the eastern spruce budworm (Lepidoptera: Tortricidae), a major mortality agent in Canadian boreal forests. To better understand these impacts, this study investigates how elevated (1000 ppm) and ambient (469 ppm) CO2 concentrations affect budworm development across different life stages. In vitro experiments revealed that budworms exposed to the elevated CO2 concentration exhibited accelerated development, with increased larval weight gain from third to sixth instars, faster pupation and adult emergence, and earlier oviposition compared to those exposed to the ambient condition. However, elevated CO2 concentration led to reduced realised fecundity. These findings highlight the direct impact of elevated CO2 concentrations on budworm biology, with important implications for its role in forest ecosystems under climate change.

Canadian entomology collections contain valuable biodiversity and ecological data. To be most accessible to those working outside of the collections, they need to be digitised. Multiple analyses of the digital database of the Odonata collection at the Royal British Columbia Museum (Victoria, British Columbia, Canada) were conducted. These analyses reveal that complete digital datasets can be used to explore questions of historical and current geographical distribution and species composition differences based on ecoprovince and elevation. The results of these analyses can be used directly in conservation and climate change impact mitigation decisions. These analyses are possible only because the Odonata collection has received concerted effort to digitise all specimen records. The full value of long-term historical insect biodiversity data can be accessed only once collections are digitised. Additional training and employment of collection management and curatorial staff is essential to optimise the use of abundant but underused Canadian biodiversity data.

Flower flies (Diptera: Syrphidae) are a ubiquitous family of true flies known for their hovering mating displays and pollinating behaviour. The flower fly genus Pterallastes Loew is represented by Pterallastes thoracicus Loew in North America, and its previously published range encompasses only the United States of America. Here, we report two new records for Canada and a previously overlooked historical record for the country. These data were used to generate an updated range map for the species, with additional iNaturalist records further expanding its known distribution in the United States of America. Finally, flower associations and natural history data for the species gathered from iNaturalist photos are discussed briefly.

Many population biology, ecology, and evolution experiments rely on the accuracy of the classification of individuals and the estimation of size population. The visual classification of vinegar flies, Drosophila melanogaster (Diptera: Drosophilidae), morphs is a laborious task usually performed by bench workers. Because of the size of the flies and the degree of precision needed to distinguish the morphological features on which the classification is based, the work is performed using a dissecting microscope. Here, we describe a method to automate the counting and identification of two types of vinegar flies, white and wild individuals. Our method is based on the image-recognition artificial intelligence (AI) tool, FlydAI (FlyDetector AI), which proved to correctly classify the flies when high-quality images were used, with a success rate of up to 100% in samples containing up to 200 individuals. This is a significant improvement with respect to preexisting approaches in terms of accuracy and specificity of the morphs detected. Although this tool is exclusively trained to routine lab tasks involving wild and white D. melanogaster, the AI can be easily trained to recognise different vinegar fly mutants and other types of insects of similar size, and its potential in other areas still needs to be explored.

Wild bees (Hymenoptera) that visit croplands rely on adjacent habitat to provide essential resources such as pollen, nectar, and nesting locations. This study compared wild bee assemblages on salt marshes and dykes, two coastal habitats proximal to cropland in Nova Scotia, Canada. We hypothesised that dykes would have a greater wild bee abundance and richness compared to salt marshes due to greater floral abundance and richness and nesting habitat availability. Wild bee richness and abundance differences between habitats were not significant. Most notably, Bombus (Latreille) and Megachildae (Latreille) bees were observed visiting a wind-pollinated salt marsh grass, Sporobolus michauxianus (Peterson and Saarela) (Poaceae). Several notable species were also observed, including the Committee on the Status of Endangered Wildlife in Canada species of concern, Bombus terricola (Kirby) (Hymenoptera: Apidae), and Lasioglossum taylorae (Gibbs) (Hymenoptera: Halictidae), a first Nova Scotia record. Floral abundance and richness were significantly greater in dyke habitats. These results contradict other studies that indicate a tight relationship between wild bees and floral abundance and richness. To help conserve these wild bees and their contributions to agriculture, more research is needed to understand how these species use salt marshes and dykes.

The economic importance of insect pests in agricultural fields and the potential biological control by their natural enemies warrant foundational studies for the development of integrated pest management strategies. An insect survey was conducted in alfalfa (Fabaceae) seed production fields in southern Alberta, Canada, during the bud, flowering, and seed crop stages in 2020 and 2021. We examined the seasonal abundance of Hypera postica (Gyllenhal) (Coleoptera: Curculionidae), Adelphocoris lineolatus (Goeze) (Hemiptera: Miridae), Lygus spp. Hahn (Hemiptera: Miridae), and 12 natural enemy taxa. We also examined the seasonal abundance, richness, and diversity of generalist predators and the seasonality of the two H. postica parasitoids, Bathyplectes curculionis (Thomson) (Hymenoptera: Ichneumonidae) and Oomyzus incertus (Ratzeburg) (Hymenoptera: Eulophidae). The seasonality of pests and natural enemies was inconsistent between years. Hypera postica larvae, B. curculionis, and O. incertus were present from mid-June to mid-August. However, we detected no correlations between H. postica larvae and its two parasitoids in either year. A number of generalist predators were correlated with A. lineolatus and Lygus spp. Further research is needed to understand the effects of environmental and biotic factors on the seasonality of pests and natural enemies in alfalfa seed production fields, and the insects’ trophic interactions.

Several broadleaf crops on the Canadian prairies suffer economic damage by Lygus bugs (Hemiptera: Miridae), populations of which are suppressed by parasitoids in the genus Peristenus (Hymenoptera: Braconidae). We used three different methods to assess levels of this parasitism for different instars of Lygus collected in southern Alberta, Canada. Screening Lygus for Peristenus DNA using a molecular polymerase chain reaction (PCR) method identified levels of parasitism ranging from 35 (second and third instars) to 47 (fifth instars) per cent. With dissection, parasitoids were recovered from 13 (second instars) to 44 (fifth instars) per cent of Lygus. For Lygus collected in the field and reared in the lab, Peristenus emerged from about 22 per cent of individuals. Our results show that use of PCR or dissection for fifth-instar larvae provides comparable estimates of parasitism. For earlier instars, PCR identifies levels of parasitism undetected using dissection – that is, 2.7-fold more for second instars in the present study. For the purposes of pest management and conservation biological control, dissection can provide adequate estimates of parasitism to inform a decision to reduce insecticides to protect Peristenus parasitoids.

Three new species of Ypresian (early Eocene) Odonata are described: Paradysagrion sosbyae gen. and sp. nov. from the Klondike Mountain Formation at Republic, Washington, United States of America, and Dysagrionites allenbyensis sp. nov. and Allenby gen. and sp. A from the Allenby Formation near Princeton, British Columbia, Canada. All three are assigned to the Dysagrionidae and Cephalozygoptera but only tentatively, as key diagnostic morphology is missing from their incomplete fossils. The definition of the collective genus Dysagrionites is broadened to include odonates tentatively assigned to the Dysagrioninae (Dysagrionidae) that are distinct as species but have unclear nominal genus affinity.

The phoretic mite assemblage of the Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Curculionidae), has not been thoroughly documented. Phoretic mites can impact fitness and population dynamics of hosts; documenting a mite assemblage may provide information on their ecological roles. We caught Douglas-fir beetles in central British Columbia, Canada, and sorted associated mites into morphospecies. Representatives of the morphospecies were DNA barcoded (CO1 barcode region), indicating at least nine operational taxonomic units (OTUs). Representatives of all OTUs were slide-mounted and morphologically identified. There was a mean of 50.5 ± 4.7 mites per beetle, with both females and males carrying similar numbers of most mite species, except for OTU B1, which was found in higher numbers on females. OTU B1, Parawinterschmidtia furnissi (Woodring) (Astigmata: Winterschmidtiidae), was found in substantially higher numbers than all other OTUs and was always clustered in large aggregations in an anterior pocket on the beetles’ subelytral surface. When this OTU was removed from the calculation, the mean number dropped to 1.3 ± 0.2 mites per beetle. The consistent high numbers of OTU B1 in conjunction with its consistent anatomical aggregation suggests an important interaction between this particular mite species and the Douglas-fir beetle.

It is unclear whether larval infestations of Rhagoletis pomonella (Walsh) (Diptera: Tephritidae) in earlier (softer) apple (Rosaceae) cultivars are greater than in later (firmer) apple cultivars in Washington State, United States of America, where flies were introduced and are quarantine pests of apple. Here, a field survey of apples in a noncommercial setting in Washington and experiments testing whether earlier apples are more suitable than later apples for Washington-origin R. pomonella were conducted. Early season ‘Gala’ and ‘Golden Delicious’, midseason ‘Red Delicious’, and late-season ‘Granny Smith’ and ‘Fuji’ were exposed to flies reared from early and midseason apples in laboratory experiments and to wild flies in apple trees in field experiments. The field survey provided evidence for softer apples being more infested and suitable. Likewise, most of the laboratory and field experimental data showed that ‘Gala’ and ‘Golden Delicious’, two of the softer apples tested, produced the most larvae and were most suitable, regardless of whether test apples were conventional or organic and ripe or unripe. To optimise fly trapping protocols in Washington, trapping in early apple trees near ‘Gala’ and ‘Golden Delicious’ orchards should be prioritised over trapping near mid- or late-season apple cultivar orchards.

The taxonomy of the subfamily Scolytinae has traditionally been based on external morphological attributes corresponding to the elytral declivity, head, and pronotum. Some traits from the general morphology of the aedeagus and spermatheca have been proposed in scarce genera. In this study, we explore and improve a technique of endophallus inflation to apply it in Scolytinae members and to describe its morphology for the first time in 16 species from Dendroctonus Erichson, Ips DeGeer, and Phloeosinus Chapuis. These taxa display differences in the attachment types of endophallus and two distinct inflation and retraction mechanisms. Our results support the use of the internal sac as a taxonomic feature in Scolytinae because each tribe, genus, and species display a particular morphological pattern. The results also indicate use of the internal sac for Dendroctonus taxonomy supports phylogenetic inferences.

Starting in the 1960s, the flea beetle Longitarsus jacobaeae (Waterhouse) (Coleoptera: Chrysomelidae) has been imported and relocated to North America for the control of the weed tansy ragwort, Jacobaea vulgaris (Asteraceae). Some Longitarsus species are morphologically almost indistinguishable, leading to questions regarding the taxonomic identity of the beetles released. Here, we present the results of a molecular study that addresses these questions and updates a list of the releases of Longitarsus within Canada. Our findings confirm the suspected release of the cryptic species L. flavicornis concurrent with releases of L. jacobaeae at sites in British Columbia, Canada, in the 1970s. However, we find no evidence for the continued presence of L. flavicornis at historical release sites in British Columbia nor in Nova Scotia, Canada, where it might potentially have been redistributed. We confirm the presence of L. gracilis Kutschera in Nova Scotia and British Columbia, the latter population likely established from a 2005 release of Longitarsus from Nova Scotia. To our knowledge, this study provides the first published confirmation of L. gracilis in Canada. Finally, we provide evidence that what were recognised in earlier work as three separate taxa (L. succineus (Foudras), L. near noricus, and Longitarsus sp.) are likely all L. succineus.

Sand flies are potential carriers of various diseases that are transmittable to humans and animals. In this study, United States Centers for Disease Control light traps were set up in four tourist caves in the Thai provinces of Surat Thani, Nakhon Si Thammarat, Satun, and Chumphon to capture Idiophlebotomus asperulus sand flies. Over a period of three months, April to June, in 2017, a total of 181 female Idiophlebotomus asperulus sand flies were captured during nightly operations. The sand flies were dissected into 23 external and internal parts to identify their morphological characteristics. Statistical analysis was then conducted on these morphological characteristics, involving both univariate analysis (one-way analysis of variance and the Kruskal–Wallis test) and multivariate analysis (canonical discriminant analysis). Levene’s, the Kolmogorov–Smirnov, and Box’s M tests were used for the preliminary statistical screening of the data. The test results revealed significant morphological differences in the sand flies from the four provinces with regard to their antenna segments 5, palpal segments 3, pharynxes, hindlegs, femurs, and spermathecae. These morphological differences in the southern Thai Idiophlebotomus asperulus sand fly population suggest the possibility that at least three morphologically different populations are found in this region.

Northern British Columbia, Canada, is an undersurveyed region for aquatic macroinvertebrates. We surveyed the Stellako River, a culturally and economically important river in the region, for adult caddisflies using Malaise traps, then identified species by using DNA barcoding, which revealed the presence of Protoptila coloma Ross (Trichoptera: Glossosomatidae). This is the first record of this species in Canada; it represents a 680-km northwards expansion of the species’ currently known range.

Little is known about the distribution and natural history of hoverflies (Diptera: Syrphidae) in western Canada. Filling in knowledge gaps and tracking this potentially changing fauna are important because hoverflies are likely important pollinators and are natural pest control agents for crops. Hoverflies were collected using Malaise traps placed near fields seeded to canola in central Alberta from May to August 2021. Platycheirus varipes Curran represents a new species record for Alberta. Two species of conservation concern and two species with extremely limited collection records were also collected. A species that was previously found only in mountainous regions and another three species whose Albertan records consisted only of iNaturalist records were found.