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Culex pipiens; Tecoma stans; acetylcholinesterase; adults; biomarkers; botanical insecticides; chemical composition; chemical constituents of plants; death; entomology; ethanol; fecundity; females; gas chromatography-mass spectrometry; glutathione transferase; instars; larvicides; leaf extracts; males; neurotoxicity; phytochemicals; progeny; reproductive performance
Abstract:
... To select potential plant‐based insecticides, Tecoma stans (Bignoniaceae) leaf extract was screened for its larvicidal and delayed effects against a medically important mosquito species Culex pipiens L. (Diptera: Culicidae). First, gas chromatography–mass spectrometry (GC–MS) was conducted on T. stans extract, collected in ethanol for its chemical characterization and detection of active constitue ...
Mathieu W. Sawadogo; Rémy A. Dabire; Besmer Régis Ahissou; Schémaëza Bonzi; Irénée Somda; Souleymane Nacro; Clément Martin; Anne Legrève; François J. Verheggen
... The South American tomato pinworm, Tuta absoluta Meyrick (Lepidoptera: Gelechiidae), is an economically important insect pest of tomatoes. Since its discovery in Burkina Faso in 2016, the use of synthetic insecticides was favored, with many cases of treatment failure. To explore alternative control methods, we conducted a screening of the 12 main tomato varieties produced in the country to test tw ...
... Surface features of plants can influence the searching efficiency and survival of predatory insects. Surfaces act as barriers preventing attachment of both phytophages and also their insect predators. In this regard, we focused on the oviposition site selection and the attachment ability of all life stages (eggs, larvae, imagines) of two common ladybird species, Propylea quatuordecimpunctata and H ...
... In Lepidoptera, it is known that larval and pupal testes enlarge in volume and then decrease in size over various phases of the pupal stage. After adult emergence, testis shrinkage continues. In the present study, the effects of temperature, age and stage on testis development were investigated in the diamondback moth, Plutella xylostella (Lepidoptera: Plutellidae). Laboratory experiments indicate ...
... In Lepidoptera, it is known that larval and pupal testes enlarge in volume and then decrease in size over various phases of the pupal stage. After adult emergence, testis shrinkage continues. In the present study, the effects of temperature, age, and stage on testis development were investigated in the diamondback moth, Plutella xylostella (Linnaeus) (Lepidoptera: Plutellidae). Laboratory experime ...
Verena Strobl; Selina Bruckner; Sarah Radford; Sarah Wolf; Matthias Albrecht; Laura Villamar‐Bouza; Jakkrawut Maitip; Eleonora Kolari; Panuwan Chantawannakul; Gaétan Glauser; Geoffrey R. Williams; Peter Neumann; Lars Straub
... The ubiquitous use of agrochemicals is one driver for the ongoing loss of insect biomass and diversity. Data show that field‐realistic concentrations of neonicotinoid insecticides can negatively affect both population density and the fitness of solitary bees. However, the underlying mechanisms for these effects remain poorly understood. Here, using an established semi‐field experimental set‐up and ...
... The solitary endoparasitoid, Microplitis rufiventris Kok, attacks and can develop in the first three instars of Spodoptera littoralis (Boisd.) larvae with preference for third‐instar. We used the last three instars to show the effect of increasing superparasitization on host resistance and reproductive capacity of surviving moths of S. littoralis that had been parasitized during their newly moulte ...
... In Riptortus pedestris (Hemiptera, Alydidae), adult females develop their ovaries under long‐day conditions (LD), but enter reproductive diapause with suppression of ovarian development under short‐day conditions (SD). This photoperiodic response is regulated by juvenile hormone (JH). Krüppel homolog 1 (Kr‐h1) encodes a JH‐inducible transcriptional factor and plays a pivotal role for reproduction ...
... Stable isotope measurements of insect tissues can be used to determine origin and migratory patterns. The isotopic links between diet and stored lipids in laboratory reared true armyworm moths (Mythimna unipuncta, Haw.) were investigated using δ¹³C and δ²H measurements. Newly emerged moths were fed synthetic nectars, consisting of different carbohydrate and water sources that were isotopically dis ...
... Income breeding animals support reproduction by the intake of energy and molecular building blocks during adulthood. Capital breeders, in contrast, fuel reproduction by the intake of materials during the larval stage. There exists, however, some controversy as to whether adult feeding in capital breeders actually increases fitness. We tested whether individuals feed as adults in the weevil Zabrote ...
... The long‐chain omega‐3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) are prevalent in aquatic ecosystems and are not part of the natural diet of herbivorous, terrestrial insects, which generally consume alpha‐linolenic acid (ALA) and linoleic acid (LNA). However, recent advances in genetic engineering have lead to the development of terrestrial crops that express the novel ...
Meriam Miladi; Khemais Abdellaoui; Elisabeth Marchal; Cynthia Lenaerts; Amel Ben Hamouda; Meriem M'saad Guerfali; Monia Ben Halima Kamel; Jozef Vanden Broeck
... Fractionation of the methanolic extract of Pergularia tomentosa, using column chromatography, resulted in the separation of 10 fractions and only the active one (that gave mortality >70%) was kept and denoted the active fraction (AFPt). Adult female Schistocerca gregaria were treated with two concentrations of AFPt, 0.24% and 0.96%, to investigate the effect on the female reproductive potential. B ...
Microplitis; Spodoptera litura; adults; biological control agents; endoparasitoids; entomology; fecundity; heat sums; longevity; temperature
Abstract:
... Microplitis similis (Hymenoptera: Braconidae) is a solitary endoparasitoid of Spodoptera litura larvae (Lepidoptera: Noctuidae). Here, the effects of constant temperature (18, 21, 24, 27, 30, 33 and 36 °C) on the development and fecundity of M. similis developing in S. litura were studied in the laboratory to clarify the range of its potential distribution and better understand its potential as a ...
... Temperature is among the most influential factors in animal biology, and especially thermal fluctuations are key determinants of life history traits for ectothermic organisms. Diet characteristics add complexity to the effect of temperature on animals' life history traits. This is even more intricate in phytophagous insects that develop inside hosts. Here, using the seed beetle Zabrotes subfasciat ...
Glaucilane S. Cruz; Valéria Wanderley‐Teixeira; José Dijair Antonino; Gabriel G. A. Gonçalves; Hilton N. Costa; Maria Clara N. Ferreira; Clovis L. Neto; Luiz C. Alves; Fábio André B. Santos; Álvaro A. C. Teixeira
... Lufenuron, a molecule that belongs to the chitin synthesis inhibitors group of insect growth regulators, has a still unclear mode of action, but probably it affects chitin synthesis at a post‐transcriptional level. In this work, we report the effects of lufenuron on nutrition and reproduction in adult females of Anthonomus grandis, the main neotropical cotton pest and tried to link the effects on ...
Calliphora vicina; Lucilia sericata; adults; body size; carrion insects; ecosystems; insect larvae; insect physiology; instars; life history; models; predators; pupae; rearing; survival rate; temperature; Central European region
Abstract:
... The present study focuses on trade‐offs between the development rates and their life‐history traits of feeding larvae. Indeed, quick growth is considered to be vital for necrophagous insects such as larvae because they are part of a rapidly changing ecosystem and at the mercy of many predators. However, excessively quick growth can have a negative effect on other life‐history traits (e.g. survivor ...
... The cold hardiness of arthropods is an important characteristic associated with overwintering success. Cold‐tolerant stages affect overwintering strategy, especially in arthropods that continuously feed on evergreen host plants in temperate regions. However, cold hardiness to mildly low temperature is rarely investigated. In the present study, we estimate the stage‐specific cold hardiness of a pop ...
... To more effectively manage walnut husk fly Rhagoletis completa (Diptera: Tephritidae), in California walnut orchards, it is important to understand the factors that affect the timing of adult emergence. In the present study, we examine the effects of incubation temperature, pre‐chill and chill durations, latitude, cultivar and size on the post‐diapause development of R. completa puparia. The lower ...
... The physiological mechanisms underlying photoperiodism in insects have been studied extensively, although the associated molecular machinery remains largely unknown. In the present study, we investigate the roles of the circadian clock gene cycle (cyc) and the endocrine regulator gene myoinhibitory peptide (Mip) in the photoperiodic response of the brown‐winged green bug Plautia stali Scott (Hemip ...
... Methoxyfenozide is an insect growth disruptor belonging to the class of nonsteroidal ecdysone agonists. In the present study, methoxyfenozide (23% emulsifiable concentrate) is evaluated against newly molted fourth‐instar larvae of Culex pipiens L. and Culiseta longiareolata Macquart (Diptera: Culicidae), aiming to investigate its possible effects on growth and development. Larvae are exposed for 2 ...
... Numerous insect species are necrophagous, with Dipterans and Coleopterans being the most abundant on a corpse. Whether the presence of necrophageous species on a corpse affects the attraction of adult blowflies to the corpse is sparsely studied. We test the hypothesis that Lucilia sericata can discriminate the odour of a noncolonized cadaver from the odour of a cadaver on which conspecific and/or ...
... Adult Aleochara bipustulata L. and Aleochara bilineata Gyllenhal (Coleoptera: Staphylinidae) are predatory on immature stages of cabbage root fly Delia radicum (L.) (Diptera: Anthomyiidae). Larvae of the two Aleochara are parasitoids of D. radicum pupae. Female Aleochara lay eggs near D. radicum puparia; the newly‐hatched Aleochara larvae enter puparia and consume the contents. Delia radicum‐infes ...
... We investigate the effects of diapause on post‐diapause development, reproductive physiology and population growth of Chilo partellus (Swinhoe) (Crambidae: Lepidoptera). Aestivating and hibernating larvae of C. partellus are exposed to diapause terminating conditions (consisting of an LD 12 : 12 h photocycle at 27 ± 1 °C and 65 ± 5% relative humidity with a fresh diet) to terminate the diapause an ...
... Aphidius colemani Viereck, emerging from Myzus persicae (Sulzer) mummies on the Brussels sprout cultivar ‘Bedford Winter Harvest’ (BWH), responds positively in the olfactometer to the odour of that cultivar in comparison with air. Responses to the odours of other sprout cultivars, cabbage and broad bean could be explained by the humidity from plant leaves. In a choice between BWH and other sprout ...
... The fertility gene boule is conserved in most organisms and deletion of boule is found to block meiosis during spermatogenesis, which contributes to male infertility. The biological role of boule in Asian citrus psyllid Diaphorina citri, currently the most serious citrus pest and the vector of huanglongbing (HLB) pathogen, remains poorly understood. In the present study, a boule homologue in Diaph ...
Bracon; Cephus cinctus; adults; biological control agents; body size; eggs; females; insect larvae; life history; longevity; nutrient requirements; overwintering; parasitoids; reproductive success; sucrose; sugar feeding; summer; sympatry; wheat; Great Plains region; North America
Abstract:
... Knowledge of the life‐history traits that influence the reproductive success of parasitoids could provide useful information to enhance their effectiveness as biological control agents. The wheat stem sawfly Cephus cinctus Norton (Hymenoptera: Cephidae) is a major pest of wheat in the Northern Great Plains of North America. The bivoltine, sympatric and specialist parasitoids Bracon cephi (Gahan) a ...
Amanda C. Túler; Christian S. A. Silva‐Torres; Valéria W. Teixeira; Alvaro A. C. Teixeira; Carolina A. Guedes; Carolline G. D'Assunção; Fábio A. Brayner; Luiz C. Alves
... The predatory ladybird beetle Tenuisvalvae notata (Coleoptera: Coccinellidae) (Mulsant) is a polygamous species and its morphology, as well as the storage capacity of seminal fluid in the spermatheca, may affect its reproductive performance. Thus, the present study evaluates the spermatheca morphology of virgin and mated T. notata females using light and scanning microscopy. The results show that ...
... The harlequin ladybird is considered to be one of the most successful invasive insect species. Among other traits, its invasive success is considered to be caused by a powerful immune system. In the present study, we investigate the ontogenetic profile of protein concentration, concentration of circulating haemocytes and constitutive antimicrobial activity against Escherichia coli in Harmonia axyr ...
... The detoxification enzymes superfamilies of cytochrome P450 (P450), glutathione S‐transferase (GST) and carboxylesterase (CoE) play important roles in the metabolism of xenobiotics and endogenous substrates. Despite their importance in insect physiology and ecology, the relative activities of these enzyme systems among developmental stages, sexes and tissues of insect species have not been studied ...
... The effects of olive leaf extract (OLE) are studied on several reproductive variables and the ovarian biochemical composition of Locusta migratoria (Orthoptera: Acrididae) adult females. The methanolic extracts are prepared from the leaves sampled during four phenological growth stages of olive tree: cluster formation (Cf), swelling inflorescence buds (Sib), full flowering (Ff) and endocarp harden ...
... Transient receptor potential channels (TRPs) are a family of cation channels involved in various sensory mechanisms in Drosophila melanogaster, including mechanosensing. Phylogenetic analysis of mechanosensory TRPs in seven members of the TRPV, TRPN and TRPA subfamilies reveals a unique TcTrpA5 in Tribolium castaneum that is likely lost in D. melanogaster. Because mechanosensors are implicated in ...
... Diapause is a strategy used by many insects living in temperate zones to survive the winter. The most reliable environmental cue to induce diapause is photoperiod, for which day or night length is measured by a mechanism called the photoperiodic clock. Despite several studies in insects, the photoperiodic mechanisms remain unclear. In the present study, we show that cryptochromes (crys) mediate ph ...
... Diapause is a common phenotype that is broadly phylogenetically dispersed across Insecta and appears to have multiple evolutionary origins. Nevertheless, there are clear commonalities in diapause regulation across insect taxa. In the present study, we report a meta‐analysis of diapause whole transcriptomic data sets from 11 different insect species that addresses three questions: (i) how similar a ...
... Diapause, a strategy to endure unfavourable conditions (e.g. cold winters) is commonly found in ectothermic organisms and is characterized by an arrest of development and reproduction, a reduction of metabolic rate, and an increased resistance to adversity. Diapause, in addition to adaptations for surviving low winter temperatures, significantly influences phenology, voltinism and ultimately popul ...
Candidatus Liberibacter asiaticus; Citrus; Diaphorina citri; Diptera; RNA interference; adults; eggs; females; gene expression; genes; greening disease; hatching; insects; males; pests; progeny; reverse transcriptase polymerase chain reaction; sex determination; sex ratio; sexual development
Abstract:
... Asian citrus psyllid Diaphorina citri Kuwayama is the vector of Candidatus Liberibacter asiaticus (CLas), the causal agent of citrus huanglongbing (HLB). A comprehensive understanding of molecular components that govern key physiological traits in D. citri would promote the development of novel genetic control strategies to fight this pest. In the present study, a transformer 2 homologue (Dctra‐2) ...
... The wolf spider Pardosa pseudoannulata (Araneae: Lycosidae) is an important biological control agent against rice pests in the paddy ecosystem. Vitellogenin (Vg) is the precursor of the yolk protein and is crucial for reproduction in P. pseudoannulata. We have identified three full‐length cDNAs encoding vitellogenins. The PpVg1 transcript is 5598 bp long, with an open reading frame (ORF) of 5379 b ...
... To cope with temporal and spatial heterogeneity of habitats, herbivorous insects in the temperate zone usually enter diapause that facilitates synchronization of their life cycle with specific stages of host plants, such as fruit ripening. In the present study, we address those factors regulating dormancy responses as part of a ‘longer strategy’ to persist and thrive in temperate environments, foc ...
... Nutritional status regulates different processes, such as growth and development, through TOR (target of rapamycin) and insulin receptor signalling pathways. The ribosomal S6 protein kinase (S6K) is a downstream element of both pathways. Using cDNA from the German cockroach Blattella germanica (L.), two S6K isoform sequences (BgS6K) are cloned. The long isoform differs from the short one by the in ...
Thaumatotibia leucotreta; adults; cold tolerance; heat; heat stress; heat tolerance; heat-shock protein 70; insects; larvae; pests; phenotypic plasticity; temperature
Abstract:
... The present study examines life stage‐related variation in the thermal limits to activity and survival in an African pest, the false codling moth Thaumatotibia leucotreta (Lepidoptera, Tortricidae). Thermal tolerance, including the functional activity limits of critical thermal maxima and minima (CTₘₐₓ and CTₘᵢₙ respectively), upper and lower lethal temperature, and the effect of heat and cold har ...
... Many insects survive seasonal adversities during diapause, a form of programmed developmental and metabolic arrest. Photoperiodically regulated entry into diapause allows multivoltine insect species to optimize the number of generations. The molecular mechanism of the photoperiodic timer is unknown in insects. In the present study, we take advantage of the robust reproductive diapause response in ...
... Accurate and timely surveillance of bed bug infestations is critical for the development of effective control strategies. Although the bed bug‐produced volatiles (E)‐2‐hexenal and (E)‐2‐octenal are considered as defensive secretions, the present study demonstrates, using ethovision® video‐tracking software (Noldus Information Technology Inc., Leesburg, Virginia), that low amounts of these commerci ...
... Ecotherms adjust their physiology to environmental temperatures. Long‐term exposures to heat or cold typically induce acclimation responses that generate directional, but reversible shifts in thermal tolerance and performance. However, less is known about how short exposure in different life stages will affect the adult phenotype. In the present study, we compared the effects of long‐term temperat ...
... The role of diet supplements (honey, water or no supplements) on egg maturation, oviposition strategy and longevity of the parasitic wasp Diaeretiella rapae McIntosh (Hymenoptera: Aphidiidae) is investigated. Parasitoids feed as larvae on hosts to acquire nutrition for growth and development, and further gain additional resources during their adult stage by feeding on either host or nonhost resour ...
Candidatus Liberibacter asiaticus; Citrus; Diaphorina citri; RNA interference; adults; bacteria; biochemical pathways; bioinformatics; cytoskeleton; flight; genes; genetic engineering; greening disease; immunity; insects; liquid chromatography; locomotion; longevity; muscles; nervous system; nymphs; protein content; protein synthesis; proteins; proteomics; reproduction; reproductive system; skeleton; tandem mass spectrometry; two-dimensional gel electrophoresis
Abstract:
... Asian citrus psyllid Diaphorina citri Kuwayama is extremely problematic worldwide, particularly where Huanglongbing (HLB) disease, the most serious and devastating of citrus diseases, is found. The threat is a result of its ability to transmit the causal agent of HLB, Candidatus Liberibacter asiaticus (CLas) bacterium. Improvements in proteomics, mass spectrometry, bioinformatics tools and gene on ...
Pseudacteon curvatus; Pseudacteon tricuspis; Solenopsis; adults; biological control; biological control agents; body size; fire ants; introduced species; longevity; parasitoids; sucrose; sugar feeding; United States
Abstract:
... Sugar feeding is known to enhance lifespan in many parasitoid species. Several species of phorid flies in the genus Pseudacteon (Diptera: Phoridae) have been introduced in the Southern U.S.A. for the biological control of imported fire ants of Solenopsis species (Hymenoptera: Formicidae). Pseudacteon species are short‐lived flies and little is known about their nutritional ecology. Results from pr ...
... Transferring Trichogramma telengai Sorokina (Hymenoptera: Trichogrammatidae) from 17 to 30 °C or vice versa at different stages of pre‐imaginal development shows that the pupa (particularly late pupa) is a sensitive stage of the maternal thermal response. During this period, even a relatively short period (1–2 days) of cold or heat exposure results, correspondingly, in a marked increase or decreas ...
... Because hosts utilized by parasitoids are vulnerable to further oviposition by conspecifics, host guarding benefits female wasps. The present study aims to test whether female adults regulate brood guarding behaviour by host discrimination in a solitary parasitoid Trissolcus semistriatus by presenting an intact or parasitized host egg mass to a female adult. Virgin females without oviposition expe ...
Candidatus Liberibacter asiaticus; Citrus; Diaphorina citri; H+/K+-exchanging ATPase; H-transporting ATP synthase; actin; adenosine diphosphate; adenosine triphosphate; adenosinetriphosphatase; adults; cytochrome P-450; cytoskeleton; energy metabolism; gene expression regulation; glutathione transferase; greening disease; heat shock proteins; mass spectrometry; mitochondria; myosin; pathogens; protein composition; protein synthesis; proteomics; stress response; tropomyosins; tubulin; two-dimensional gel electrophoresis
Abstract:
... Asian citrus psyllid Diaphorina citri is the vector of the citrus Huanglongbing (HLB) associated bacterial agent ‘Candidatus Liberibacter asiaticus’ (CLas). The molecular interactions between CLas and D. citri remain unclear. In the present study, protein profiles of mitochondrial, microsomal and cytosolic fractions from uninfected and CLas‐infected adult D. citri are investigated using two‐dimens ...
... For decades, Juvenile Hormone (JH) has been a major focus of studies investigating the endocrine regulation of wing‐polymorphism. The most general model postulates a single threshold, above which JH causes the expression of traits that define the short‐winged morph (SW), and below which JH causes the expression of traits that define the long‐winged morph (LW). Early studies in aphids and crickets ...
... The ash leaf cone roller Caloptilia fraxinella Ely (Lepidoptera: Gracillariidae) is an invasive leaf‐mining moth pest of horticultural ash Fraxinus spp. in the Canadian Prairie Provinces. Caloptilia fraxinella overwinter as adults in reproductive diapause and mating occurs after overwintering in the spring. The effect of a carbohydrate food source on fat and glycerol reserves throughout the long a ...
... Plant quality is one of the main factors influencing the fitness of phytophagous insects. Plant quality can vary not only among genotypes of the same host plant species, but also relative to the insect sex or its life stage. In the present study, the performance of larvae and adults of the pollen beetle (Meligethes aeneus F., Coleoptera: Nitidulidae), a major insect pest of oilseed rape crops, is ...
... Larvae of Dendrocerus carpenteri Curtis (Hymenoptera: Megaspilidae) develop as solitary ectoparasitoids on the prepupae and pupae of primary aphid parasitoids inside the aphid mummy. First instars are aggressive and kill potential competitors; however, facultative gregarious development of two, and occasionally three, larvae may occur under superparasitism. To test the hypothesis that gregarious l ...
... The large white butterfly Pieris brassicae L. (also called cabbage white) is very common in Europe, Asia and the northern region of Africa, and has also been found in South Africa during approximately the last 20 years. The species is considered a pest insect, with larvae attacking brassicaceous crops. The adult is a strong migratory flyer and new territory can be infested this way. As a first ste ...
... The blow fly Protophormia terraenovae responds to photoperiod and temperature to control reproductive diapause. Differentially expressed genes (DEGs) in the brain are investigated under diapause‐inducing and diapause‐averting conditions in search of potential genes for diapause induction. Total RNA is extracted from female brains 1–2.5 days after adult emergence under an LD 18 : 6 h photocycle at ...
... In 1936, Erwin Bünning suggested that photoperiodic time measurement was a function of the circadian system. Colin Pittendrigh became an ardent supporter of Bünning's hypothesis, drawing parallels between photoperiodism and his own group's investigations of adult eclosion rhythmicity in the fruit fly Drosophila pseudoobscura. They developed several more modern versions of Bünning's general hypothe ...
... In the desert locust (Schistocerca gregaria Forsskål), vision is a seemingly indispensable prerequisite for many behaviour patterns. The question arises as to whether and to what extent other senses can compensate for the loss of vision, and whether this can take place in the adult stage. To answer this question, both of the compound eyes of nymphs in the final pre‐adult stage are blinded (but not ...
... Adults of the Chagas disease vector Triatoma infestans Klug (Hemiptera: Reduviidae: Triatominae), possess paired exocrine glands: the metasternal and Brindley's glands. Both glands are discharged by disturbed adults, releasing an alarm pheromone that elicits an escape response of larvae. The present study analyzes the individual (or combined) effects of some of the volatiles of the whole pheromone ...
... Secretions of an eversible gland on the metathorax of larvae of Chlaenius cordicollis Kirby (Coleoptera: Carabidae) are investigated by headspace analysis using solid phase microextraction followed by gas chromatography‐mass spectrometry (GC‐MS). Larvae from Manitoba, Canada and Pennsylvania, U.S.A., are sampled. Nine presumed defensive compounds are detected when the gland is everted, and this re ...
... Larvae of Helicoverpa armigera (Hübner) can develop a form of Bt tolerance after exposure to sub‐lethal doses of Bt‐toxin subclass Cry1Ac. Increasing levels of tolerance are produced over generations of larval exposure, which are not related to DNA sequence changes, and are largely maternally transmitted. The characteristic of maternal transmission, combined with the importance of egg parasitoids ...
... Glucose‐regulated protein 78 (GRP78) is a heat shock protein 70 (HSP70) specific to the endoplasmic reticulum (ER). It acts as a chaperone and a signalling regulator that responds to ER stresses in vertebrates. However, its role in invertebrates, including in insects, is uncertain. The present study determines the full grp78 cDNA sequence and expression patterns of grp78 in Aphis gossypii Glover, ...
... Throughout an organism's lifetime, resources are strategically allocated to many different functions, including reproduction. Reproduction can be costly for both sexes; females produce nutrient‐rich eggs, whereas males of many species produce large and complex ejaculates. In capital breeding insects, nutrients are mainly acquired during the larval period, yet allocation decisions impact the reprod ...
Nicrophorus orbicollis; adults; body size; breeding; energy; females; food deprivation; gender differences; insect larvae; males; parenting; prediction; risk; sexual maturity; starvation; weight gain
Abstract:
... The relationships of larval nutritional resources with adult body size, starvation resistance and reproductive decisions are not always clear. Burying beetle larvae with inadequate nutrition are hypothesized to develop into relatively large adults that are able to contest for breeding resources. The trade‐off is that the emerging adult has minimal energy reserves and is more susceptible to starvat ...
... Carbohydrates and protein comprise two of the major macronutrients and many animals regulate their dietary intake of both. In the field, the carbohydrate (C) to protein (P) intake of Mormon crickets Anabrus simplex Haldeman (Orthoptera: Tettigoniidae) is indicative of a nutritional imbalance affecting both migration and immunity. In the present study, dietary choice experiments in the laboratory a ...
... To clarify the role of Juvenile hormone (JH) in the induction of oosorption in females of the stink bug Plautia stali Scott (Heteroptera: Pentatomidae), the effects of extirpation and implantation of the corpus cardiac‐corpus allatum complex (CC‐CA) are examined in fed and starved adults, respectively. Removal of CC‐CA induces oosorption in fed females, whereas CC‐CA implantation stimulates ovary ...
... Adult males of Drosophila species (Drosophila melanogaster L. and Drosophila virilis) show a lower tolerance to heat stress compared with females. The present study investigates the effects of RNA interference (RNAi) knockdown of the insulin‐like receptor in the corpus allatum of D. melanogaster males on dopamine metabolism and content, heat stress resistance and juvenile hormone metabolism. In ma ...
... The mating behaviour of a quasi‐gregarious egg parasitoid Telenomus triptus Nixon (Hymenoptera: Platygastridae), which exploits egg masses of a stink bug Piezodorus hybneri (Heteroptera: Pentatomidae), is examined in the laboratory. In this parasitoid wasp, male adults that emerge earlier stay at the natal egg mass and mate with subsequently emerging females. In the present study, a male adult tha ...
Caloptilia; accessory sex glands; adults; autumn; body size; diapause; environmental factors; juvenile hormone analogs; males; moths; nutrition; overwintering; progeny; protein content; reproduction; spring; summer
Abstract:
... Reproductive diapause is a strategy employed by some insects to coordinate reproduction with the appropriate environmental conditions for mate location and offspring development. Male Caloptilia fraxinella Ely (Lepidoptera: Gracillariidae) eclose in July in reproductive diapause, and remain unmated until May of the next year, when they emerge from overwintering sites in a reproductively active sta ...
... Most insects show daily activity rhythms that are controlled by endogenous circadian clocks. A basic property of the clock is entrainment to daily environmental cycles to run with an exact 24‐h period. The entrainment is achieved mainly through resetting by light. The present study analyses the light resetting mechanism of the clock in first‐instar nymphal and adult crickets Gryllus bimaculatus (D ...
... Understanding the factors affecting stress tolerance in phytoseiid mites is critical for their integration into biological control programs. In the present study, the effects of diet (varying in prey species, physiological status and phenotype) are examined on the future starvation tolerance of the predatory mite Neoseiulus californicus McGregor (Acari: Phytoseiidae). The predators are fed from eg ...
... Host acceptance by gynoparae and winged virginoparae of the bird cherry‐oat aphid Rhopalosiphum padi (L.) is investigated utilizing leaves and aqueous extracts of the primary and secondary hosts, as well as nonhost plants. Gynoparae are specialized to reproduce on bird cherry Prunus padus L., whereas virginoparae reproduce and feed on various grasses. Host acceptance is assessed using levels of re ...
... The pine weevil [Hylobius abietis (L.); Coleoptera: Curculionidae] has a high economic impact on forest regeneration in Europe. The general biology of the pine weevil has received considerable attention, although there is insufficient knowledge about its diel behaviour and time budget. Therefore, in the present study, the feeding and locomotion behaviour of individual adult weevils on Norway spruc ...
... Reproductive diapause enables long‐lived insects to time mating with environmental conditions suitable for offspring development. Plasticity in the perception of pheromones used in sexual communication may enable mate‐finding at the appropriate time of year. The moth Caloptilia fraxinella (Ely) (Lepidoptera: Gracillariidae) undergoes a 9‐month reproductive diapause, during which the male response ...
Drosophila suzukii; adults; blueberries; body size; diet; eggs; fecundity; females; larvae; larval development; life history; males; microorganisms; pests; ripening; Europe
Abstract:
... Most larval drosophilids eat the microorganisms that develop in rotting fruit, a relatively protein‐rich resource. By contrast, the spotted‐wing Drosophila suzukii Matsumara (Diptera: Drosophilidae) uniquely develops in ripening fruit, a protein‐poor, carbohydrate‐rich resource. This shift in larval nutritional niche has led to D. suzukii being a significant agricultural pest in the U.S.A. and Eur ...
... Insects including parasitoid wasps use acoustic and vibratory signals in the context of sexual communication, mate recognition, courtship and mating. Males of the parasitoid wasp Pimpla disparis Viereck (Hymenoptera: Ichneumonidae) detect insect host pupae parasitized by a conspecific female, learn their location, visit them repeatedly and remain on or near them when the prospective mate nears eme ...
... Aedes aegypti (Diptera: Culicidae) has adapted to urban environments. The urbanization process provides suitable habitats for this disease vector, subsequently increasing the probability of the transmission of pathogens in high‐density environments. Urban environments provide metal‐stressed larval habitats. However, little is known about the physiological cost of metal stress or how this might aff ...
... Diapause and cold tolerance are essential for temperate insects to pass the winter, with the mechanisms controlling these two traits varying considerably among insects. In the present study, diapause and cold tolerance are compared among three Leptopilina species: Leptopilina japonica Novković & Kimura, Leptopilina victoriae Nordlander and Leptopilina ryukyuensis Novković & Kimura, all larval para ...
Harmonia axyridis; adults; chemical reactions; dimorphism; instars; males; metabolism; ontogeny; rearing; temperature
Abstract:
... Temperature is considered to be the most important environmental factor influencing the performance of ectotherms because it determines the rate of most biochemical reactions and thus the efficiency of metabolism and its function. Unfortunately, most studies investigate the effects of temperature on individuals exposed to a particular temperature regime during their whole pre‐imaginal development ...
... The physiological basis for pigment synthesis in lepidopteran wing scales is well‐studied, although less is known about the reasons why individuals of the same species vary in pigmentation. Monarch butterflies (Danaus plexippus L.) show subtle variations in the shade of orange on their wings and this is known to predict flight ability and mating success. The present study tests the possibility tha ...
... Filtration of haemolymph in insects to remove waste products is performed by nephrocytes, which comprise accessory cells of the circulatory system that are not connected to Malpighian tubules. There are two types of nephrocytes in Drosophila: ventral cells, situated around the junction between the cardia and the oesophagus, and pericardial cells, situated around the heart. In the present study, th ...
Drosophila melanogaster; acclimation; adults; climate change; crossbreds; extinction; habitat fragmentation; heterosis; inbreeding; inbreeding depression; locomotion; random mating; rearing; temperature
Abstract:
... Climate change poses a serious threat to the existence of many species. The combination of habitat fragmentation and increasing temperatures is of particular concern because it can alter demographic and population genetic processes, which may ultimately lead to extinction. Locomotion is very important in mitigating the negative impacts of these processes by upholding migration and contributing to ...
... The lower and upper thermal activity thresholds of adult and larval Balaustium hernandezi von Heyden (Acari: Erythraeidae) are compared with those of its prey Tetranychus urticae Koch (Acari: Tetranychidae). Adult female B. hernandezi retain ambulatory function (CTₘᵢₙ) and movement of appendages (chill coma) at significantly lower temperatures (5.9 and −2.1 °C, respectively) than those of larval B ...
... Variations in δ¹³C and δ¹⁵N might arise from differences in nutrient allocation. Residence times of δ¹³C and δ¹⁵N vary among tissues depending on metabolic turnover rates. However, because of their small size, entire individual insects are generally used as single samples in isotope analyses. The present study aimed to determine the degree of isotope similarity among regions of the adult body and ...
... Mantispids (Neuroptera: Mantispidae) are remarkable insects as a result of their close resemblance to the praying mantis (order Mantodea). Although not closely related phylogenetically, as a result of similar selective pressures, both mantispids and mantids have evolved powerful raptorial forelegs for capturing insects. Another striking feature is the hypermetamorphosis in mantispid development, a ...
... Post‐teneral diets containing yeast hydrolysate are reported to increase longevity, reproductive development and sexual performance of Queensland fruit fly (‘Q‐fly’) Bactrocera tryoni Froggatt (Diptera: Tephritidae). Consequently, diets including yeast hydrolysate are recommended for sterile Q‐flies before release in sterile insect technique (SIT) programmes. However, in some tephritids, diets inc ...
Plodia interpunctella; adults; eclosion; larvae; photoperiod; temperature
Abstract:
... In addition to photoperiod, thermoperiod (or thermocycle) might be an important Zeitgeber for entraining the circadian oscillator controlling adult eclosion rhythm in the Indian meal moth Plodia interpunctella Hübner (Lepidoptera: Pyralidae). This is confirmed by exposing larvae receiving diapause‐preventing treatments to various thermocycles with different means and amplitudes of temperature. The ...
... Crowding causes many organisms to express phenotypic plasticity in various traits. Phase polyphenism in desert locusts represents one extreme example in which a solitary form (solitarious phase) turns into a gregarious form (gregarious phase) in response to crowding. Conspicuous differences in body size and colour occur even in hatchlings. The phase‐specific differences in hatchling characteristic ...
... Adult butterflies feed largely on floral nectar and tree sap, both of which consist mainly of carbohydrates and include little nitrogen. They depend on the larval diet for nitrogenous resources. Consequently, there is a trade‐off between the reproductive and somatic nitrogenous investments of adults. Furthermore, male butterflies invest a considerable amount into spermatophores, containing nitroge ...
... The use of floral resources to improve the efficiency of natural enemies has grown in recent years, although their effect on pest populations has been overlooked. To understand how access to food resources by adults of Plutella xylostella (L.) (Lepidoptera: Plutellidae) affects their reproduction, the effects of amino acids and carbohydrates (i.e. fructose, glucose and sucrose) on the longevity, l ...
Nezara viridula; adults; climate; climate change; color; crops; diapause; environmental factors; field experimentation; models; overwintering; pests; winter; Japan
Abstract:
... The southern green stink bug Nezara viridula (L.) (Heteroptera: Pentatomidae) has long attracted attention not only as a serious pest of numerous agricultural crops, but also as a species expanding its range in many parts of the world. Nezara viridula has also been widely used as a model in different experimental studies. The present review focuses on reproductive (i.e. adult) winter diapause, whi ...
... Mating is an energy demanding process, imposing risks to physical injuries, pathogen infection and predation. Nevertheless, repeated and multiple mating are widespread even in insect species where nuptial gifts are not involved. The effects of repeated mating, by the same male, are examined on the reproductive performance of female Southern green stink bug Nezara viridula (L.). Fecundity is reduce ...
... The response of adult flower thrips Frankliniella intonsa (Trybom) (Thysanoptera: Thripidae) to conspecifics is investigated in Yâtube olfactometer bioassays. The results show that both males and females are attracted to the odours of adult males, which indicates a maleâproduced aggregation pheromone in this species. Gas chromatographyâmass spectroscopy analyses of headspace volatiles collec ...
... The quantity and quality of host nutrients can affect fitness‐related traits in hymenopteran parasitoids, including oogenesis. The present study tested the prediction that a high host quality will influence oogenesis‐related traits positively in synovigenic parasitoids, and that a high‐quality adult parasitoid diet can positively affect the same parameters, potentially compensating for development ...
Plodia interpunctella; adults; eclosion; insects; larval development; photoperiod; temperature
Abstract:
... The rhythm of adult eclosion in the Indian meal moth Plodia interpunctella Hübner (Lepidoptera: Pyralidae) is investigated under various photoperiods and temperatures aiming to determine the nature of the temperature compensation and the free‐running period. Insects that are committed to a nondiapause larval development show diel rhythms of adult eclosion at 30, 25 and 20 °C. At 30 °C, the eclosio ...
Diatraea saccharalis; adults; carbon; gas chromatography; hydrocarbons; larvae; pupae
Abstract:
... The epicuticular hydrocarbons of the larval, pupal and adult stages of the sugarcane borer Diatraea saccharalis Fabricius (Lepidoptera: Crambidae) are analysed. Dramatic changes are observed between the stages studied. Adult hydrocarbons are mostly saturated, with a predominance of 1–4 methyl‐branched straight carbon skeletons of 37–47 atoms; the major components are isomeric mixtures of internall ...
Bactrocera tryoni; adults; fecundity; females; irradiation; male fertility; males; margin of safety; nutrition; pupae; sterile insect technique
Abstract:
... Pupae of the Queensland fruit fly or Qâfly Bactrocera tryoni (Froggatt) are irradiated routinely to induce reproductive sterility in adults for use in sterile insect technique programmes. Previous studies suggest that adult sexual performance and survival under nutritional and crowding stress are compromised by the current target dose of radiation for sterilization (70â75 Gy), and that improve ...
Cotesia glomerata; adults; diploidy; females; haploidy; homozygosity; inbreeding; larvae; life history; loci; males; mortality; parasitoids; protandry; pupal development; sex determination; sexual dimorphism; temperature
Abstract:
... Protandry, the earlier adult emergence of males, is explained as either an adaptive strategy maximizing male mating opportunities at the same time as minimizing female pre-reproductive mortality, or as an incidental by-product of sexual dimorphism fuelled by selection for other life-history traits. Adult emergence sequences are monitored of broods of the gregarious larval endoparasitoid Cotesia gl ...
Fritillaria; Lilioceris lilii; Lilium; adults; air; air flow; bioassays; females; gardens; host plants; males; odors; pests; North America; Northern European region
Abstract:
... The lily beetle Lilioceris lilii (Scopoli) (Coleoptera: Chrysomelidae) feeds on Lilium, Fritillaria and Cardiocrinum plants and is a serious pest in gardens and amenity plantings in parts of Northern Europe and North America. In the present study, the odour‐mediated behaviour of L. lilii is investigated by behavioural bioassays using a linear‐track olfactometer. The behavioural responses of L. lil ...
... The photoperiodic response of diapause induction is studied in females of five subtropical and warmâtemperate zone populations of Nezara viridula (L.) (Heteroptera: Pentatomidae) in Japan (26.4â34.7°N; 127.4â135.7°E). Laboratory tests at 25 °C demonstrate that both warmâtemperate and subtropical populations have pronounced photoperiodic responses of adult diapause induction. Under short ...
... The relevance of visual and olfactory cues for host-plant location is investigated in males and females of the oligophagous mustard leaf beetle Phaedon cochleariae Fabricius (Coleoptera: Chrysomelidae). Different objects are offered in a walking arena and the behaviour of beetles is observed. Beetles orient toward vertically or horizontally striped black and white pattern independent of stripe ori ...