| reduction of mortality rates of bacillus thuringiensis var. israelensis aqueous suspensions due to freezing and thawing. | when studying the behavior (carry, dispersion, persistence) of bacillus thuringiensis var. israelensis (b.t.i.) formulations used in the treatment of rivers or streams for black fly control, a large number of samples containing small quantities of b.t.i. are required for proper analysis. freezing is a useful procedure to prevent enzymatic alteration or bacterial growth in samples before bioassays are to be performed. using aedes atropalpus neonate larvae, we studied the effect of freezing and th ... | 1992 | 1431857 |
| vertical transmission of st. louis encephalitis virus to autogenously developed eggs of aedes atropalpus mosquitoes. | vertical transmission of st. louis encephalitis virus was demonstrated by a strain of aedes atropalpus mosquitoes from garrett county, md. five-day-old parental females containing fully formed autogenous eggs were infected by intrathoracic inoculation. st. louis encephalitis virus was detected in batches of fertilized eggs and fourth instar larvae. estimated filial infection rates of approximately 1% were observed for both eggs and larvae. | 1990 | 2098473 |
| first record of ascogregarina taiwanensis (apicomplexa: lecudinidae) in north american aedes albopictus. | aedes albopictus collected in the east st. louis, illinois, area were found infected with the gregarine protozoan, ascogregarina taiwanensis. infection rates varied from 67 to 95% at 4 sites and 0 to 10% at 2 others. lower infection levels were found in ae. epactius (42%) and culex restuans (one larva). four mosquito species were cross-infected in the laboratory with gregarines isolated from field-collected hosts. aedes atropalpus was 90% susceptible to a. taiwanensis (100% in ae. albopictus), w ... | 1990 | 2370530 |
| oral and transovarial transmission of la crosse virus by aedes atropalpus. | a recently colonized strain of aedes atropalpus was shown to be equally susceptible to oral infection with la crosse (lac) virus as the natural vector, aedes triseriatus. la crosse virus was shown to replicate and persist at high titers in orally infected ae. atropalpus. in addition, orally infected females transmitted virus efficiently to suckling mice by mosquito bite. transovarial transmission of lac virus was demonstrated by recovery of virus from larval progeny after parental females were i ... | 1984 | 6476218 |
| experimental transovarial transmission of st. louis encephalitis virus by culex and aedes mosquitoes. | colonized and field-collected female culex tarsalis, infected with st. louis encephalitis, (sle) virus by intrathoracic inoculation or by feeding on a viremic host, transmitted virus to their f1 adult and/or larval progeny when reared at 18(+/- 1) degree c but not when reared at 27(+/- 1) degrees c. the minimal infection rates (mir) for different populations of cx. tarsalis ranged from 1:32 to less than 1:250 (mean = 1:121) for larval progeny and from 1:32 to less than 1:1, 989 (mean = 1:1,571) ... | 1984 | 6696174 |
| host range tests with edhazardia aedis (microsporida: culicosporidae) against northern nearctic mosquitoes. | twelve species of northern nearctic mosquitoes representing five genera (aedes, anopheles, culex, culiseta, and psorphora) were bioassayed for susceptibility to edhazardia aedis, an exotic, heterosporous, microsporidian parasite of the yellow fever mosquito, aedes aegypti. infections were achieved in aedes atropalpus, aedes triseriatus, and aedes vexans following oral ingestion of uninucleate spores obtained from patently infected ae. aegypti larvae. the microsporidium underwent normal vegetativ ... | 1994 | 7914904 |
| genetic determinants of host ranges of bacillus sphaericus mosquito larvicidal toxins. | the 51.4-kda-41.9-kda binary toxin produced by different strains of bacillus sphaericus shows differential activity toward culex quinquefasciatus, aedes atropalpus, and aedes aegypti mosquito larvae. the patterns of larvicidal activity toward all three mosquito species and growth retardation in a. aegypti have been shown to be due to the 41.9-kda protein. by using mutant toxins expressed in escherichia coli, insecticidal activity and growth retardation correlated with amino acids centered around ... | 1993 | 8419297 |
| sensory aspects of host location in mosquitoes. | visual, thermal and olfactory stimuli all contribute to blood meal host location in mosquitoes but olfaction is probably the dominant sensory modality used for this purpose. much attention has been devoted to the l-lactic acid receptor because it is well characterized and because its sensitivity is a major determinant of host responsiveness in the anautogenous species aedes aegypti. studies employing statistical analysis of close to 500 single unit recordings and the scanning electron microscope ... | 1996 | 8894299 |
| seasonal abundance and distribution of mosquitoes at a rural waste tire site in illinois. | the species composition, abundance, and distribution of mosquito larvae in tires were determined on 3 dates at a relatively large rural tire dump (about 300,000 tires) in southeastern il (jasper county). several observations at this site differed from those in previous reports about mosquitoes in tireyards, including 1) a relatively high percentage of tires positive for aedes triseriatus larvae in an open-field area, 2) a greater abundance of culex pipiens than cx. restuans in late-season collec ... | 1997 | 9249660 |
| identification of a north american mosquito species, aedes atropalpus (diptera: culicidae), in italy. | in late september 1996, during a routine survey for aedes albopictus in italy, a population of aedes atropalpus s.s. was discovered in the veneto region (northern italy). larvae were collected in 2 tire storage areas belonging to tire recapping companies that imported loads of car and large equipment used tires from eastern europe and north america. aedes atropalpus is found only in north america and hence it is the origin of this species. control measures were carried out in october, but by the ... | 1997 | 9383765 |
| current status of aedes albopictus and aedes atropalpus in italy. | eight years after the 1st record in italy, scattered foci of aedes albopictus are reported in 9 regions and 107 municipalities belonging to 22 provinces, mainly located in the northeastern part of the country (veneto region). in almost all infested areas the species is well controlled and at low levels of density, through source reduction and antilarval treatments. aedes atropalpus, 1st recorded in 1996, remains limited to the original focus in the province of treviso. surveillance and control o ... | 1999 | 10480136 |
| vector competence of north american mosquitoes (diptera: culicidae) for west nile virus. | we evaluated the potential for several north american mosquito species to transmit the newly introduced west nile (wn) virus. mosquitoes collected in the new york city metropolitan area during the recent wn virus outbreak, at the assateague island wildlife refuge, va, or from established colonies were allowed to feed on chickens infected with wn virus isolated from a crow that died during the 1999 outbreak. these mosquitoes were tested approximately 2 wk later to determine infection, disseminati ... | 2001 | 11296813 |
| discovery, distribution, and abundance of the newly introduced mosquito ochlerotatus japonicus (diptera: culicidae) in connecticut, usa. | the earliest documented specimen of an exotic east asian mosquito ochlerotatus (finlaya) japonicis japonicus (theobald) in the western hemisphere is reported along with the results of a state wide survey to determine the distribution and abundance of this mosquito in connecticut. ochlerotatus japonicus was collected from 87 locations in eight counties. it is established throughout the state and occurs in a variety of natural and artificial container habitats including discarded tire casings, bir ... | 2001 | 11761373 |
| ecdysteroids and oocyte development in the black fly simulium vittatum. | oocyte development was studied in the autogenous black fly, simulium vittatum (diptera, nematocera), a vector of onchocerca volvulus, the causative agent of onchocerciasis. | 2002 | 12015816 |
| rna interference-mediated knockdown of a gata factor reveals a link to anautogeny in the mosquito aedes aegypti. | blood feeding tightly regulates the reproductive cycle in anautogenous mosquitoes. vitellogenesis (the synthesis of yolk protein precursors) is a key event in the mosquito reproductive cycle and is activated in response to a blood meal. before blood feeding, aedes aegypti is in a state of reproductive arrest during which the yolk protein precursor genes (ypps) are repressed. the regulatory region of the major ypp gene vitellogenin (vg) has multiple gata-binding sites required for the high expres ... | 2003 | 14595016 |
| larval mosquitoes in abandoned tire pile sites from west virginia. | larvae of 13 mosquito species were collected from abandoned tire piles at peridomestic and nonperidomestic sites in 3 south-central west virginia counties from may through september 2002. ochlerotatus triseriatus was the most frequently collected species from may through august, whereas aedes albopictus and ochlerotatus japonicus were more prevalent in september. prevalence of oc. triseriatus and culex restuans declined throughout the study period. conversely, prevalences of ae. albopictus, oc. ... | 2004 | 15088700 |
| storage hexamer utilization in two lepidopterans: differences correlated with the timing of egg formation. | most insects produce two or more storage hexamers whose constituents and developmental profiles are sufficiently different to suggest specialization in the ways that they support metamorphosis and reproduction. hexamerin specializations are compared here in the cecropia moth (hyalophora cecropia), which produces eggs during the pupal-adult molt, and the monarch butterfly (danaus plexippus), which produces eggs under long-day conditions after adult eclosion. in both sexes of both species, reserve ... | 2001 | 15455062 |
| primary characterization and basal promoter activity of two hexamerin genes of musca domestica. | hexamerins are high molecular-weight proteins found in the hemolymph of insects and have been proposed to function as storage proteins. in previous studies, two musca domestica hexamerins, designated hex-l and hex-f were characterized. hex-l is synthesized exclusively by the larval fat bodies, is secreted into the hemolymph and likely provides a source of amino acids and energy during metamorphosis. hex-f synthesis is induced by a proteinaceous meal and occurs only in the adult insect fat bodies ... | 2004 | 15861218 |
| entomopathogenic fungi for mosquito control: a review. | fungal diseases in insects are common and widespread and can decimate their populations in spectacular epizootics. virtually all insect orders are susceptible to fungal diseases, including dipterans. fungal pathogens such as lagenidium, coelomomyces and culicinomyces are known to affect mosquito populations, and have been studied extensively. there are, however, many other fungi that infect and kill mosquitoes at the larval and/or adult stage. the discovery, in 1977, of the selective mosquito-pa ... | 2004 | 15861235 |
| the importance of agricultural tire habitats for mosquitoes of public health importance in new york state. | the presence of mosquito species breeding in agricultural "bunker tires" on dairy farms in new york state was evaluated. twelve species of mosquitoes (aedes vexans, anopheles barberi, an. punctipenriis, an. perplexens, culex pipiens pipiens, cx. restuans, cx. salinarius, cx. territans, toxorhynchites rutilus septentrionalis, ochlerotatus atropalpus, oc. japonicus japonicus, and oc. triseriatus) were collected from 8 new york state dairy farms in 2001 and from 17 dairy farms in 2002. all but 2 of ... | 2005 | 16033118 |
| sex-, stage- and tissue-specific regulation by a mosquito hexamerin promoter. | a portion of the 5'-flanking region of the female-specific hexamerin gene, hex-1.2, from the mosquito ochlerotatus atropalpus was used to drive expression of the luciferase reporter gene in drosophila melanogaster. the proximal 0.7 kb of 5'-flanking dna were sufficient to partially repress reporter gene activity in males and to drive tissue- and stage-specific expression comparable with that of the endogenous o. atropalpus hex-1.2 gene. the drosophila doublesex transcription factor (dsx), expres ... | 2006 | 16756549 |
| genomic and evolutionary analyses of tango transposons in aedes aegypti, anopheles gambiae and other mosquito species. | tango is a transposon of the tc1 family and was originally discovered in the african malaria mosquito, anopheles gambiae. here we report a systematic analysis of the genome sequence of the yellow fever mosquito, aedes aegypti, which uncovered three distinct tango transposons. we name the only an. gambiae tango transposon agtango1 and the three ae. aegypti tango elements aetango1-3. like agtango1, aetango1 and aetango2 elements both have members that retain characteristics of autonomous elements ... | 2007 | 17506852 |
| ecology of invasive mosquitoes: effects on resident species and on human health. | investigations of biological invasions focus on patterns and processes that are related to introduction, establishment, spread and impacts of introduced species. this review focuses on the ecological interactions operating during invasions by the most prominent group of insect vectors of disease, mosquitoes. first, we review characteristics of non-native mosquito species that have established viable populations, and those invasive species that have spread widely and had major impacts, testing wh ... | 2005 | 17637849 |
| larval competition alters susceptibility of adult aedes mosquitoes to dengue infection. | dengue, the most important human arboviral disease, is transmitted primarily by aedes aegypti and, to a lesser extent, by aedes albopictus. the current distributions of these invasive species overlap and are affected by interspecific larval competition in their container habitats. here we report that competition also enhances dengue infection and dissemination rates in one of these two vector species. we determined the effects of competition on adult a. aegypti and a. albopictus, comparing their ... | 2008 | 18077250 |
| larval mosquito communities in discarded vehicle tires in a forested and unforested site: detritus type, amount, and water nutrient differences. | discarded tires are an important habitat for larvae of multiple species of disease-transmitting mosquitoes. although tire locations likely influence composition and abundance of vectors, there are few data linking vector populations to the characteristics of the aquatic tire environment. we sampled water-filled tires at three times at a forested and an unforested site to evaluate how differences in detritus inputs or nutrients in these two macrohabitats may be associated with composition of mosq ... | 2007 | 18260510 |
| seroprevalence and risk factors of chikungunya virus infection in mayotte, indian ocean, 2005-2006: a population-based survey. | background: since 2006, chikungunya virus (chikv) has re-emerged as an important pathogen of global concern. however, individual and household factors associated with the acquisition and the magnitude of clinically silent chikv infections remain poorly understood. in this present study, we aimed to investigate the seroprevalence, estimate the proportion of symptomatic illness and identify the risk factors for chikv infection in the primo-exposed population of mayotte. methods/ principal findings ... | 2008 | 18725980 |
| post-epidemic chikungunya disease on reunion island: course of rheumatic manifestations and associated factors over a 15-month period. | although the acute manifestations of chikungunya virus (chikv) illness are well-documented, few data exist about the long-term rheumatic outcomes of chikv-infected patients. we undertook between june and september 2006 a retrospective cohort study aimed at assessing the course of late rheumatic manifestations and investigating potential risk factors associated with the persistence of these rheumatic manifestations over 15 months. 147 participants (>16 yrs) with laboratory-confirmed chikv disease ... | 2009 | 19274071 |
| life history plasticity after attaining a dietary threshold for reproduction is associated with protein storage in flesh flies. | body condition affects the timing and magnitude of life history transitions. therefore, identifying proximate mechanisms involved in assessing condition is critical to understanding how these mechanisms affect the expression of life history plasticity. nutrient storage is an important body condition parameter, likely playing roles in both attaining minimum body-condition thresholds for life history transitions and expression of life history traits.we manipulated protein availability for females ... | 2008 | 19789714 |
| first report of a north american invasive mosquito species ochlerotatus atropalpus (coquillett) in the netherlands, 2009. | in late august and early september 2009, numerous larvae, pupae, and actively flying adult specimens of ochlerotatus atropalpus were discovered in the province of brabant, southern netherlands, during surveillance activities for aedes albopictus at two trading companies that import used tires. no ae. albopictus were found. both companies mainly import used tires from countries in europe, but also from north america. oc. atropalpus is endemic to north america and has so far only been found outsid ... | 2009 | 19941786 |
| aëdes atropalpus (coq.) a new mosquito vector of plasmodium gallinaceum brumpt. | | 1946 | 20277207 |
| vitellogenin gene expression in autogenous culex tarsalis. | autogeny, the ability of a mosquito to mature an initial batch of eggs without blood feeding, is an alternative reproductive strategy with important implications for vector-borne disease transmission. regulation of the major yolk protein (vitellogenin; vg) genes during bloodmeal-induced oogenesis is well studied, but little is known about regulation of vitellogenesis in autogenous mosquitoes. we characterized the expression of four vitellogenin genes (vg1a, vg1b, vg2a and vg2b) in an autogenous ... | 2010 | 20456510 |
| introduction and control of three invasive mosquito species in the netherlands, july-october 2010. | in july 2010, during routine mosquito surveillance inspections at companies that import used tires, three invasive species were found at five locations in the netherlands: the yellow fever mosquito (aedes aegypti), the asian tiger mosquito (ae. albopictus), and the american rock-pool mosquito (ae. atropalpus). this is the first time that ae. aegypti is reported from the netherlands. mosquito control was initiated one week after the first invasive mosquito was found, using adulticides and larvici ... | 2010 | 21087591 |
| laboratory selection for an accelerated mosquito sexual development rate. | abstract: background: separating males and females at the early adult stage did not ensure the virginity of females of anopheles arabiensis (dongola laboratory strain), whereas two years earlier this method had been successful. in most mosquito species, newly emerged males and females are not able to mate successfully. for anopheline species, a period of 24 h post-emergence is generally required for the completion of sexual maturation, which in males includes a 180degrees rotation of the genital ... | 2011 | 21595988 |
| collection of aedes atropalpus from coastal rock holes on the keweenaw peninsula, michigan. | | 2014 | 3880254 |
| abstracts of the fourth international symposium on molecular insect science. may 28-june 2, 2002. tucson, arizona, usa. | | 2002 | 15455051 |
| biosynthesis and function of polyacetylenes and allied natural products. | polyacetylenic natural products are a substantial class of often unstable compounds containing a unique carbon-carbon triple bond functionality, that are intriguing for their wide variety of biochemical and ecological functions, economic potential, and surprising mode of biosynthesis. isotopic tracer experiments between 1960 and 1990 demonstrated that the majority of these compounds are derived from fatty acid and polyketide precursors. during the past decade, research into the metabolism of pol ... | 2008 | 18387369 |
| current status of invasive mosquito surveillance in the uk. | non-native invasive mosquitoes have for many years made incursions into europe, and are now established in many european countries. the continued european importation of potential vectors and their expansion within europe increases their potential for importation and establishment in the uk. coupled with increasing numbers of returning dengue and chikungunya infected travellers, the potential exists for transmission of vector borne disease in new regions. | 2015 | 26122427 |
| out of the bush: the asian bush mosquito aedes japonicus japonicus (theobald, 1901) (diptera, culicidae) becomes invasive. | the asian bush or rock pool mosquito aedes japonicus japonicus is one of the most expansive culicid species of the world. being native to east asia, this species was detected out of its original distribution range for the first time in the early 1990s in new zealand where it could not establish, though. in 1998, established populations were reported from the eastern us, most likely as a result of introductions several years earlier. after a massive spread the mosquito is now widely distributed i ... | 2014 | 24495418 |
| a review of the invasive mosquitoes in europe: ecology, public health risks, and control options. | there has been growing interest in europe in recent years in the establishment and spread of invasive mosquitoes, notably the incursion of aedes albopictus through the international trade in used tires and lucky bamboo, with onward spread within europe through ground transport. more recently, five other non-european aedine mosquito species have been found in europe, and in some cases populations have established locally and are spreading. concerns have been raised about the involvement of these ... | 2012 | 22448724 |
| european surveillance for west nile virus in mosquito populations. | a wide range of arthropod-borne viruses threaten both human and animal health either through their presence in europe or through risk of introduction. prominent among these is west nile virus (wnv), primarily an avian virus, which has caused multiple outbreaks associated with human and equine mortality. endemic outbreaks of west nile fever have been reported in italy, greece, france, romania, hungary, russia and spain, with further spread expected. most outbreaks in western europe have been due ... | 2013 | 24157510 |
| development of guidelines for the surveillance of invasive mosquitoes in europe. | the recent notifications of autochthonous cases of dengue and chikungunya in europe prove that the region is vulnerable to these diseases in areas where known mosquito vectors (aedes albopictus and aedes aegypti) are present. strengthening surveillance of these species as well as other invasive container-breeding aedine mosquito species such as aedes atropalpus, aedes japonicus, aedes koreicus and aedes triseriatus is therefore required. in order to support and harmonize surveillance activities ... | 2013 | 23866915 |
| distribution and habitat characterization of the recently introduced invasive mosquito aedes koreicus [hulecoeteomyia koreica], a new potential vector and pest in north-eastern italy. | the container breeding species belonging to the genus aedes (meigen) are frequently recorded out of their place of origin. invasive aedes species are proven or potential vectors of important arboviruses and their establishment in new areas pose a threat for human and animal health. a new species of exotic mosquito was recorded in 2011 in north-eastern italy: aedes (finlaya) koreicus [hulecoeteomyia koreica]. the aim of this study was to characterize the biology, the environment and the current d ... | 2013 | 24457085 |
| community ecology of container mosquitoes (diptera: culicidae) in virginia following invasion by aedes japonicus. | the success of an invasive species in a new region depends on its interactions with ecologically similar resident species. invasions by disease vector mosquitoes are important as they may have ecological and epidemiological consequences. potential interactions of a recent invasive mosquito, aedes japonicus theobald, with resident species in virginia were evaluated by sampling larvae from containers and trapping adults. distinct species compositions were observed for artificial containers and roc ... | 0 | 23270159 |
| invasion biology of aedes japonicus japonicus (diptera: culicidae). | aedes japonicus japonicus (theobald) (diptera: culicidae) has recently expanded beyond its native range of japan and korea into large parts of north america and central europe. population genetic studies begun immediately after the species was detected in north america revealed genetically distinct introductions that subsequently merged, likely contributing to the successful expansion. interactions, particularly in the larval stage, with other known disease vectors give this invasive subspecies ... | 0 | 24397520 |
| targeting gene expression to the female larval fat body of transgenic aedes aegypti mosquitoes. | as the fat body is a critical tissue for mosquito development, metamorphosis, immune and reproductive system function, the characterization of regulatory modules targeting gene expression to the female mosquito fat body at distinct life stages is much needed for multiple, varied strategies for controlling vector-borne diseases such as dengue and malaria. the hexameric storage protein, hexamerin-1.2, of the mosquito aedes atropalpus is female-specific and uniquely expressed in the fat body of fou ... | 2012 | 23241066 |
| north american wetlands and mosquito control. | wetlands are valuable habitats that provide important social, economic, and ecological services such as flood control, water quality improvement, carbon sequestration, pollutant removal, and primary/secondary production export to terrestrial and aquatic food chains. there is disagreement about the need for mosquito control in wetlands and about the techniques utilized for mosquito abatement and their impacts upon wetlands ecosystems. mosquito control in wetlands is a complex issue influenced by ... | 2012 | 23222252 |
| crouching tiger, hidden trouble: urban sources of aedes albopictus (diptera: culicidae) refractory to source-reduction. | our ultimate objective is to design cost-effective control strategies for aedes albopictus, the asian tiger mosquito, an important urban nuisance and disease vector that expanded worldwide during the last 40 years. we conducted mosquito larval surveys from may through october 2009 in the city of trenton, new jersey, usa, while performing intensive monthly source-reduction campaigns that involved removing, emptying, or treating all accessible containers with larvicides and pupicides. we examined ... | 2013 | 24167593 |
| interspecific competition of a new invasive mosquito, culex coronator, and two container mosquitoes, aedes albopictus and cx. quinquefasciatus (diptera: culicidae), across different detritus environments. | the mosquito culex coronator (dyar and knab) (diptera: culicidae) has undergone rapid range expansion in the united states since 2003, with its historical distribution in the southwest expanding eastward to the atlantic coast. although cx. coronator nominally use small natural aquatic habitats for development, the use of containers (e.g., tires) makes it potentially important as container invasive. to determine the potential ecological effects of cx. coronator on resident container species, we c ... | 0 | 24605457 |
| culex tarsalis vitellogenin gene promoters investigated in silico and in vivo using transgenic drosophila melanogaster. | genetic modification, or transgenesis, is a powerful technique to investigate the molecular interactions between vector-borne pathogens and their arthropod hosts, as well as a potential novel approach for vector-borne disease control. transgenesis requires the use of specific regulatory regions, or promoters, to drive expression of genes of interest in desired target tissues. in mosquitoes, the vast majority of described promoters are from anopheles and aedes mosquitoes. | 2014 | 24586476 |
| functional circadian clock genes are essential for the overwintering diapause of the northern house mosquito, culex pipiens. | the short day lengths of late summer are used to program the overwintering adult diapause (dormancy) of the northern house mosquito, culex pipiens. here, we investigated the role of clock genes in initiating this diapause and asked whether the circadian cycling of clock gene expression persists during diapause. we provide evidence that the major circadian clock genes continue to cycle throughout diapause and after diapause has been terminated. rna interference (rnai) was used to knock down the c ... | 0 | 25653422 |
| monitoring population and environmental parameters of invasive mosquito species in europe. | to enable a better understanding of the overwhelming alterations in the invasive mosquito species (ims), methodical insight into the population and environmental factors that govern the ims and pathogen adaptations are essential. there are numerous ways of estimating mosquito populations, and usually these describe developmental and life-history parameters. the key population parameters that should be considered during the surveillance of invasive mosquito species are: (1) population size and dy ... | 2014 | 24739334 |
| invasive process and repeated cross-sectional surveys of the mosquito aedes japonicus japonicus establishment in belgium. | when accidentally introduced in a new location, a species does not necessarily readily become invasive, but it usually needs several years to adapt to its new environment. in 2009, a national mosquito survey (modirisk) reported the introduction and possible establishment of an invasive mosquito species, aedes j. japonicus, in belgium. first collected in 2002 in the village of natoye from a second-hand tire company, then sampled in 2003 and 2004, the presence of adults and larvae was confirmed in ... | 2014 | 24694576 |
| gut bacteria differentially affect egg production in the anautogenous mosquito aedes aegypti and facultatively autogenous mosquito aedes atropalpus (diptera: culicidae). | aedes aegypti and a. atropalpus are related mosquitoes that differ reproductively. aedes aegypti must blood-feed to produce eggs (anautogenous) while a. atropalpus always produces a first clutch of eggs without blood-feeding (facultatively autogenous). we recently characterized the gut microbiota of a. aegypti and a. atropalpus that were reared identically in the laboratory. here, we assessed the effects of specific members of the gut microbiota in a. aegypti and a. atropalpus on female fitness ... | 2016 | 27363842 |
| ecophysiology of anopheles gambiae s.l.: persistence in the sahel. | the dry-season biology of malaria vectors is poorly understood, especially in arid environments when no surface waters are available for several months, such as during the dry season in the sahel. here we reappraise results on the dry-season physiology of members of the anopheles gambiae s.l. complex in the broad context of dormancy in insects and especially in mosquitoes. we examine evidence on seasonal changes in reproduction, metabolism, stress tolerance, nutrition, molecular regulation, and ... | 2014 | 24933461 |
| diversity of mosquitoes and the aquatic insects associated with their oviposition sites along the pacific coast of mexico. | the abundance, richness and diversity of mosquitoes and aquatic insects associated with their oviposition sites were surveyed along eight states of the pacific coast of mexico. diversity was estimated using the shannon index (h'), similarity measures and cluster analysis. | 2014 | 24450800 |
| species interactions among larval mosquitoes: context dependence across habitat gradients. | biotic interactions involving mosquito larvae are context dependent, with effects of interactions on populations altered by ecological conditions. relative impacts of competition and predation change across a gradient of habitat size and permanence. asymmetrical competition is common and ecological context changes competitive advantage, potentially facilitating landscape-level coexistence of competitors. predator effects on mosquito populations sometimes depend on habitat structure and on emerge ... | 0 | 19067629 |
| delayed egg hatching of anopheles gambiae (diptera: culicidae) pending water agitation. | mosquito eggs laid on water surfaces typically hatch spontaneously soon after the embryos within them become fully formed first-instar larvae. however, we have found that anopheles gambiae giles, an important vector of malaria in africa, exhibits delayed hatching until the water surface is agitated, a feature overlooked in most laboratory colonies. agitation within 24 h postoviposition, before embryonation was complete, failed to stimulate delayed postembryonic hatching of isolated eggs on the f ... | 0 | 24897850 |
| mosquito oviposition behavior and vector control. | the burden of gene transfer from one mosquito generation to the next falls on the female and her eggs. the selection of an oviposition site that guarantees egg and larval survival is a critical step in the reproductive process. the dangers associated with ephemeral aquatic habitats, lengthy droughts, freezing winters, and the absence of larval nutrition makes careful oviposition site selection by a female mosquito extremely important. mosquito species exhibit a remarkable diversity of ovipositio ... | 2016 | 27869724 |
| larval competition between aedes japonicus and aedes atropalpus (diptera: culicidae) in simulated rock pools. | the success of an invasive species becoming established in a new region often depends on its interactions with ecologically similar resident species. the propensity of the newly-established mosquito aedes japonicus to inhabit rock pools throughout the eastern united states provides a natural setting for interspecific larval competition with the native aedes atropalpus. a laboratory experiment conducted in simulated rock pools to evaluate larval interactions between and within these two species s ... | 0 | 19263842 |
| linking land cover and species distribution models to project potential ranges of malaria vectors: an example using anopheles arabiensis in sudan and upper egypt. | anopheles arabiensis is a particularly opportunistic feeder and efficient vector of plasmodium falciparum in africa and may invade areas outside its normal range, including areas separated by expanses of barren desert. the purpose of this paper is to demonstrate how spatial models can project future irrigated cropland and potential, new suitable habitat for vectors such as an. arabiensis. | 2012 | 22866895 |
| environmental and genetic factors determine whether the mosquito aedes aegypti lays eggs without a blood meal. | some mosquito strains or species are able to lay eggs without taking a blood meal, a trait named autogeny. this may allow populations to persist through times or places where vertebrate hosts are scarce. autogenous egg production is highly dependent on the environment in some species, but the ideal conditions for its expression in aedes aegypti mosquitoes are unknown. we found that 3.2% of females in a population of ae. aegypti from kenya were autogenous. autogeny was strongly influenced by temp ... | 2015 | 25646251 |
| duplication, concerted evolution and purifying selection drive the evolution of mosquito vitellogenin genes. | mosquito vitellogenin (vtg) genes belong to a small multiple gene family that encodes the major yolk protein precursors required for egg production. multiple vtg genes have been cloned and characterized from several mosquito species, but their origin and molecular evolution are poorly understood. | 2010 | 20465817 |
| mosquito vitellogenin genes: comparative sequence analysis, gene duplication, and the role of rare synonymous codon usage in regulating expression. | comparative sequence analysis of mosquito vitellogenin (vg) genes was carried out to gain a better understanding of their evolution. the genomic clones of vitellogenin genes were isolated and sequenced from all three subfamilies of the family culicidae including culicinae (aedes aegypti, ochlerotatus atropalpus, ae. polynesiensis, ae. albopictus, ochlerotatus triseriatus and culex quinquefasciatus), toxorhynchitinae (toxorhynchites amboinensis), and anophelinae (anopheles albimanus). genomic clo ... | 0 | 20337554 |
| culex quinquefasciatus larval microbiomes vary with instar and exposure to common wastewater contaminants. | like many insects, mosquitoes, rely on endosymbionts to grow and develop. these can be acquired from the environment. we used next generation 454 pyrosequencing to discern the whole-body microbiome of the mosquito species culex quinquefasciatus in various larval stadia and following exposure to common pharmaceutical and personal care products (ppcps) found in wastewater. ppcp treatments included environmentally-relevant concentrations; 1) a combination of common antibiotics, 2) a combination of ... | 2016 | 26912375 |
| multiple factors contribute to anautogenous reproduction by the mosquito aedes aegypti. | aedes aegypti is an anautogenous mosquito that must blood feed on a vertebrate host to produce and lay a clutch of eggs. the rockpool mosquito, georgecraigius atropalpus, is related to a. aegypti but is a facultatively autogenous species that produces its first clutch of eggs shortly after emerging without blood feeding. consumption of a blood meal by a. aegypti triggers the release of ovary ecdysteroidogenic hormone (oeh) and insulin-like peptide 3 (ilp3) from the brain, which stimulate egg for ... | 2015 | 26255841 |
| elizabethkingia anophelis: molecular manipulation and interactions with mosquito hosts. | flavobacteria (members of the family flavobacteriaceae) dominate the bacterial community in the anopheles mosquito midgut. one such commensal, elizabethkingia anophelis, is closely associated with anopheles mosquitoes through transstadial persistence (i.e., from one life stage to the next); these and other properties favor its development for paratransgenic applications in control of malaria parasite transmission. however, the physiological requirements of e. anophelis have not been investigated ... | 2015 | 25595771 |
| diapause induction and termination in the small brown planthopper, laodelphax striatellus (hemiptera: delphacidae). | the small brown planthopper, laodelphax striatellus (fallén) enters the photoperiodic induction of diapause as 3rd or 4th instar nymphs. the photoperiodic response curves in this planthopper showed a typical long-day response type with a critical daylength of approximately 11 h at 25 °c, 12 h at 22 and 20 °c and 12.5 h at 18 °c, and diapause induction was almost abrogated at 28 °c. the third stage was the most sensitive stage to photoperiod. the photoperiodic response curve at 20 °c showed a gra ... | 2014 | 25188306 |
| mosquitoes rely on their gut microbiota for development. | field studies indicate adult mosquitoes (culicidae) host low diversity communities of bacteria that vary greatly among individuals and species. in contrast, it remains unclear how adult mosquitoes acquire their microbiome, what influences community structure, and whether the microbiome is important for survival. here, we used pyrosequencing of 16s rrna to characterize the bacterial communities of three mosquito species reared under identical conditions. two of these species, aedes aegypti and an ... | 2014 | 24766707 |
| four-way regulation of mosquito yolk protein precursor genes by juvenile hormone-, ecdysone-, nutrient-, and insulin-like peptide signaling pathways. | anautogenous mosquito females require a meal of vertebrate blood in order to initiate the production of yolk protein precursors by the fat body. yolk protein precursor gene expression is tightly repressed in a state-of-arrest before blood meal-related signals activate it and expression levels rise rapidly. the best understood example of yolk protein precursor gene regulation is the vitellogenin-a gene (vg) of the yellow fever mosquito aedes aegypti. vg-a is regulated by (1) juvenile hormone sign ... | 2014 | 24688471 |
| ovary ecdysteroidogenic hormone functions independently of the insulin receptor in the yellow fever mosquito, aedes aegypti. | most mosquito species must feed on the blood of a vertebrate host to produce eggs. in the yellow fever mosquito, aedes aegypti, blood feeding triggers medial neurosecretory cells in the brain to release insulin-like peptides (ilps) and ovary ecdysteroidogenic hormone (oeh). theses hormones thereafter directly induce the ovaries to produce ecdysteroid hormone (ecd), which activates the synthesis of yolk proteins in the fat body for uptake by oocytes. ilp3 stimulates ecd production by binding to t ... | 2013 | 24076067 |
| latitudinal clines: an evolutionary view on biological rhythms. | properties of the circadian and annual timing systems are expected to vary systematically with latitude on the basis of different annual light and temperature patterns at higher latitudes, creating specific selection pressures. we review literature with respect to latitudinal clines in circadian phenotypes as well as in polymorphisms of circadian clock genes and their possible association with annual timing. the use of latitudinal (and altitudinal) clines in identifying selective forces acting o ... | 2013 | 23825204 |
| analysis of ovary-specific genes in relation to egg maturation and female nutritional condition in the mosquitoes georgecraigius atropalpus and aedes aegypti (diptera: culicidae). | analysis of the reproductive physiology of anautogenous mosquitoes at the molecular level is complicated by the simultaneity of ovarian maturation and the digestion of a blood meal. in contrast to anautogenous mosquitoes, autogenous female mosquitoes can acquire greater nutrient stores as larvae and exhibit higher ovarian production of ecdysteroids at adult eclosion. these features essentially replace the role of a blood meal in provisioning the first batch of eggs and initiating egg development ... | 2012 | 23238126 |
| ovary ecdysteroidogenic hormone activates egg maturation in the mosquito georgecraigius atropalpus after adult eclosion or a blood meal. | the rockpool mosquito, georgecraigius atropalpus, is a facultatively autogenous species that produces its first egg clutch without a blood meal shortly after emergence. several days after depositing this clutch, females must take a blood meal to produce a second egg clutch. decapitation of females shortly after emergence or blood ingestion prevents egg maturation. here, we report that a single injected dose of the neuropeptide ovary ecdysteroidogenic hormone (oeh) fully restored egg maturation i ... | 2012 | 22811249 |
| larval food quantity affects development time, survival and adult biological traits that influence the vectorial capacity of anopheles darlingi under laboratory conditions. | the incidence of malaria in the amazon is seasonal and mosquito vectorial capacity parameters, including abundance and longevity, depend on quantitative and qualitative aspects of the larval diet. anopheles darlingi is a major malaria vector in the amazon, representing >95% of total anopheles population present in the porto velho region. despite its importance in the transmission of the plasmodium parasite, knowledge of the larval biology and ecology is limited. studies regarding aspects of adul ... | 2012 | 22856645 |
| regulation of behaviorally associated gene networks in worker honey bee ovaries. | several lines of evidence support genetic links between ovary size and division of labor in worker honey bees. however, it is largely unknown how ovaries influence behavior. to address this question, we first performed transcriptional profiling on worker ovaries from two genotypes that differ in social behavior and ovary size. then, we contrasted the differentially expressed ovarian genes with six sets of available brain transcriptomes. finally, we probed behavior-related candidate gene networks ... | 0 | 22162860 |
| recent topics on the regulatory mechanism of ecdysteroidogenesis by the prothoracic glands in insects. | molting and metamorphosis are strictly regulated by steroid hormones known as ecdysteroids. it is now widely recognized that ecdysteroid biosynthesis (ecdysteroidogenesis) in the prothoracic gland (pg) is regulated by the tropic factor prothoracicotropic hormone (ptth). however, the importance of ptth in the induction of molting and metamorphosis remains unclear, and other mechanisms are thought to be involved in the regulation of ecdysteroidogenesis by the pg. recently, new regulatory mechanism ... | 2011 | 22645515 |
| a honey bee hexamerin, hex 70a, is likely to play an intranuclear role in developing and mature ovarioles and testioles. | insect hexamerins have long been known as storage proteins that are massively synthesized by the larval fat body and secreted into hemolymph. following the larval-to-pupal molt, hexamerins are sequestered by the fat body via receptor-mediated endocytosis, broken up, and used as amino acid resources for metamorphosis. in the honey bee, the transcript and protein subunit of a hexamerin, hex 70a, were also detected in ovaries and testes. aiming to identify the subcellular localization of hex 70a in ... | 2011 | 22205988 |
| analysis of molecular markers for metamorphic competency and their response to starvation or feeding in the mosquito, aedes aegypti (diptera: culicidae). | the nutritional condition of fourth instar larvae of the yellow fever mosquito, aedes aegypti, governs female longevity and egg production, both are key determinants of pathogen transmission. as well, nutrition provisions larval growth and development and attains its greatest pace in the last larval instar in preparation for metamorphosis to an adult. these developmental processes are regulated by a complex endocrine interplay of juvenile hormone, neuropeptides, and ecdysteroids that is nutritio ... | 2010 | 20816681 |
| evolutionary conservation of amino acid composition in paralogous insect vitellogenins. | comparison of paralogous vitellogenins in 10 insect species representing six orders showed a remarkable degree of conservation of amino acid composition in spite of sequence differences. for example, the correlation between the percentages of the 20 amino acids in two vitellogenins from the beetle tribolium castaneum was 0.975, even though the two amino acid sequences differed from each other at 49.4% of sites. there was a positive correlation between the frequency of occurrence of reciprocal pa ... | 2010 | 20655995 |
| the four hexamerin genes in the honey bee: structure, molecular evolution and function deduced from expression patterns in queens, workers and drones. | hexamerins are hemocyanin-derived proteins that have lost the ability to bind copper ions and transport oxygen; instead, they became storage proteins. the current study aimed to broaden our knowledge on the hexamerin genes found in the honey bee genome by exploring their structural characteristics, expression profiles, evolution, and functions in the life cycle of workers, drones and queens. | 2010 | 20346164 |
| occurrence and abundance of a mariner-like element in freshwater and terrestrial planarians (platyhelminthes, tricladida) from southern brazil. | transposable elements are dna sequences present in all the large phylogenetic groups, both capable of changing position within the genome and constituting a significant part of eukaryotic genomes. the mariner family of transposons is one of the few which occurs in a wide variety of taxonomic groups, including freshwater planarians. nevertheless, so far only five planarian species have been reported to carry mariner-like elements (mles), although several different species have been investigated. ... | 2009 | 21637447 |
| major chorion proteins and their crosslinking during chorion hardening in aedes aegypti mosquitoes. | the chorion of aedes aegypti eggs undergoes a hardening process following oviposition and individual chorion proteins become insoluble thereafter. our previous studies determined that peroxidase-catalyzed chorion protein crosslinking and phenoloxidase-mediated chorion melanization are primarily responsible for the formation of a hardened, desiccation resistant chorion in a. aegypti eggs. to gain further understanding of peroxidase- and phenoloxidase-catalyzed biochemical processes during chorion ... | 2006 | 17098170 |
| real-time pcr tests in dutch exotic mosquito surveys; implementation of aedes aegypti and aedes albopictus identification tests, and the development of tests for the identification of aedes atropalpus and aedes japonicus japonicus (diptera: culicidae). | since 2009, the netherlands food and consumer product safety authority carries out surveys focusing on, amongst others, the presence of invasive mosquito species (ims). special attention is given to exotic container-breeding aedes species aedes aegypti (l.), aedes albopictus (skuse), aedes atropalpus (coquillett), and aedes japonicus japonicus (theobald). this study describes the implementation of real-time pcr tests described by hill et al. (2008) for the identification of ae. aegypti and ae. a ... | 2015 | 26334807 |
| ovicidal activity of three insect growth regulators against aedes and culex mosquitoes. | interspecific variations in the susceptibility of freshly and embryonated eggs of aedes albopictus, ae. aegypti, ae. atropalpus and culex pipiens were tested against three classes of insect growth regulators (igrs) including ecdysone agonist (azadirachtin), chitin synthesis inhibitor (diflubenzuron) and juvenile hormone analog (pyriproxyfen) at 0.001, 0.01, 0.1 and 1.0ppm concentrations. egg hatching inhibition was dose dependent, the highest being at 1.0ppm concentration for freshly laid eggs o ... | 2013 | 23860181 |
| public health significance of invasive mosquitoes in europe. | there are currently five invasive aedes mosquito species known to be established in europe, namely aedes albopictus, aedes aegypti, aedes japonicus, aedes atropalpus and aedes koreicus. aedes albopictus and aedes aegypti are the incriminated vectors in the recent outbreaks of chikungunya and dengue fever in europe. however, both laboratory experiments and field observations indicate that these invasive mosquitoes have a potential to also transmit other pathogens of public health importance. incr ... | 2013 | 23574618 |
| effects of larval nutrition on the endocrinology of mosquito egg development. | reproduction by female mosquitoes is dependent on energy resources but modulated by hormones. our study focused on blood-meal-dependent, anautogenous aedes aegypti and autogenous ochlerotatus atropalpus that rely on larval-derived nutrient stores to develop eggs. to determine how larval nutrition affects the endocrinology of egg development in these females, we manipulated the quantity of larval food and measured in vitro production of juvenile hormone (jh) by corpora allata (ca) and ecdysteroid ... | 2006 | 16449559 |
| oviposition responses of aedes aegypti and ae. atropalpus (diptera: culicidae) females to waters from conspecific and heterospecific normal larvae and from larvae infected with plagiorchis elegans (trematoda: plagiorchiidae). | ovipositing aedes aegypti (l.) females were attracted to waters in which uninfected aedes atropalpus (coquillett) larvae had been reared, but were repelled by waters from larvae of either species infected with the entomopathogenic digenean plagiorchis elegans (rudolphi). in contrast, ae. atropalpus females were attracted to or repelled by waters from conspecific uninfected and infected larvae, respectively, but did not respond to corresponding waters from ae. aegypti larvae. the sensitivity of o ... | 1997 | 9379463 |
| hormonal regulation of ovarian ecdysteroid production in the autogenous mosquito, aedes atropalpus. | the effects of juvenile hormone (jh) and egg development neurosecretory hormone (ednh) on ovarian ecdysteroid production during vitellogenesis in the autogenous mosquito, aedes atropalpus, were investigated using in vitro techniques coupled with radioimmunoassay (ria) and high-pressure liquid chromatography (hplc). normal females were characterized by quantitative, qualitative, and temporal patterns of in vitro ovarian ecdysteroid production. females decapitated at emergence showed little ovaria ... | 1984 | 6541607 |
| effect of malathion on larval competition between aedes albopictus and aedes atropalpus (diptera: culicidae). | aedes albopictus (skuse) and aedes atropalpus (coquillett) (diptera: culicidae) are container-dwelling mosquito species that are well established in the eastern united states. interspecific larval competition studies have shown ae. albopictus to be a superior competitor over many species. a laboratory experiment was conducted in artificial containers to evaluate the effects of malathion on larval interactions between ae. albopictus and ae. atropalpus. the survivorship of ae. albopictus increased ... | 2011 | 21485393 |
| larval survey of tire-breeding mosquitoes in alabama. | a state-wide survey of tire-breeding mosquitoes in alabama was conducted in 2004 and 2005. tire sites in all 67 counties in the state of alabama were sampled for mosquito larvae. a total of 13,022 mosquito larvae, representing 12 species in 7 genera, was collected. the most frequently collected species were aedes albopictus (70.4%), culex territans (8.0%), and ochlerotatus triseriatus (7.1%). the following species were also collected: cx. restuans (6.0%), cx. salinarius (2.7%), orthopodomyia sig ... | 2006 | 17304924 |
| colonization of rock holes by aedes albopictus in the southeastern united states. | aedes albopictus was collected from water-holding rock holes along 3 streams in georgia and 1 in south carolina. to compare the occurrence of ae. albopictus and aedes atropalpus, rock holes were sampled for immature aedes at 2 sites where there were numerous rock holes harboring mosquitoes. at 1 of these sites, tree holes and various types of artificial containers were also sampled for immature aedes. at both sites, immature ae. albopictus occurred in rock holes much less frequently than the roc ... | 1997 | 9383770 |
| a rapid identification guide for larvae of the most common north american container-inhabiting aedes species of medical importance. | mosquitoes are the single most important taxon of arthropods affecting human health globally, and container-inhabiting aedes are important vectors of arthropod-borne viruses. desiccation-resistant eggs of container aedes have facilitated their invasion into new areas, primarily through transportation via the international trade in used tires. the public health threat from an introduced exotic species into a new area is imminent, and proactive measures are needed to identify significant vectors b ... | 2013 | 24199495 |
| morphological and molecular characterization of a microsporidian parasite, takaokaspora nipponicus n. gen., n. sp. from the invasive rock pool mosquito, ochlerotatus japonicus japonicus. | a new genus and species of microsporidia, takaokaspora nipponicus n. gen., n. sp. is described from ochlerotatus japonicus japonicus (theobald) and ochlerotatus hatorii (yamada) based on light microscope and ultrastructural morphology, developmental features, transmission cycles and comparative sequence analyses of the small subunit ribosomal dna (ssu rdna). the microsporidium is both vertically and horizontally transmitted, exhibits dimorphic development alternating between diplokaryotic and mo ... | 2013 | 23932975 |
| weak larval competition between the invasive mosquito aedes japonicus japonicus (diptera: culicidae) and three resident container-inhabiting mosquitoes in the laboratory. | the spread of exotic mosquito species into new environments can introduce shifts in mosquito populations and potentially alter public health risks to mosquito-borne diseases. the successful establishment of exotic species may occur due to their competitive advantage over other cohabitating species. we hypothesized that the recently introduced exotic mosquito aedes japonicus japonicus (theobald) would be a more effective competitor than aedes atropalpus (coquillett) and aedes triseriatus (say), a ... | 2012 | 22493844 |
| interspecific larval competition between invasive aedes japonicus and native aedes triseriatus (diptera: culicidae) and adult longevity. | the asian rock pool mosquito aedes japonicus (theobald) inhabits natural and artificial container habitats, some of which are occupied by the native treehole mosquitoaedes triseriatus (say), a vector of lacrosse encephalitis virus. a laboratory experiment was used to evaluate the effects of nutrient limitation and interspecific interactions between these species. the goal was to address two related hypotheses. first, interspecific interactions between these species show competitive asymmetry wit ... | 2011 | 21485358 |
| the effect of larval and adult nutrition on successful autogenous egg production by a mosquito. | females of most mosquito species require a blood meal to provision eggs and can be medical problems because of this dependency. autogenous mosquitoes do not require blood to mature an initial egg batch and, instead, acquire nutrients for egg provisioning as larvae. we studied the importance of larval and adult nourishment for ochlerotatus atropalpus which is obligatory autogenous for its first egg cycle but may ingest blood for subsequent cycles. larval nourishment strongly influenced autogenous ... | 2004 | 15234628 |
| identification of two mariner-like elements in the genome of the mosquito ochlerotatus atropalpus. | two distinct mariner-like elements, atmar-1 and atmar-2, were isolated from the genome of the mosquito ochlerotatus atropalpus. full-sized atmar-1 elements, obtained by screening a genomic library, have a 1293-bp consensus sequence with 27-bp inverted terminal repeats and a 1047-bp open reading frame (orf) encoding the transposase. the atmar-2 elements were amplified by polymerase chain reaction from genomic dna and contain the central part of the transposase orf. individual clones of both marin ... | 2004 | 15041021 |
| female-specific expression of a hexamerin gene in larvae of an autogenous mosquito. | fourth-instar larvae of the autogenous mosquito, aedes atropalpus, synthesize three hexamerins or hexameric storage proteins which are distinguished by different methionine and aromatic amino-acid contents. one protein, hexamerin-1.2 (aathex-1.2) is only found in female larvae and pupae. in order to investigate the molecular basis for this sex-specific accumulation, we have cloned and sequenced the cdna encoding aathex-1.2 and isolated and sequenced over 1 kb of the 5' flanking region of the aat ... | 2001 | 11722555 |
| methyl 4-hydroxy-3-(3'-methyl-2'-butenyl)benzoate, major insecticidal principle from piper guanacastensis. | the chcl3-soluble extract of piper guanacastensis (piperaceae) was found to have noteworthy insecticidal activity to aedes atropalpus mosquito larvae (lc50 80.5 micrograms/ml). bioassay-guided fractionation afforded methyl 4-hydroxy-3-(3'-methyl-2'-butenyl)benzoate (1) as the major bioactive constituent (lc50 20.5 micrograms/ml). the separation of compound 1 from its transesterification artifact (2), ethyl 4-hydroxy-3-(3'-methyl-2'-butenyl)benzoate, was achieved by recycling reversed-phase hplc. ... | 1997 | 9090871 |
| comparative susceptibility of larvae of three aedes species to malathion and permethrin. | larvae of aedes hendersoni, ae. atropalpus, and 6 geographic strains of ae. triseriatus were compared in terms of their susceptibility to malathion and permethrin. aedes atropalpus was most tolerant to malathion, whereas ae. triseriatus (walton strain) was most tolerant to permethrin. malathion lc50s for 6 geographic strains of ae. triseriatus ranked from high to low were: alabama (ala) > michigan (underc) > indiana (wal) > kentucky (uken) > texas (sal) > florida (vb); similar ranking of permeth ... | 1995 | 8825499 |