| establishment of an in vitro method for evaluating whitefly resistance in tomato. | an accurate and simple evaluation method is crucial for identifying whitefly resistance in tomato breeding. we developed an in vitro method for evaluating resistance of tomato leaves and tested this on wild and cultivated tomato varieties. we found that young leaves observed for whitefly oviposition after 8 hours provided appropriate comparative conditions. this method effectively distinguished resistance among tomato cultivars and wild species and also demonstrated significant difference in ovi ... | 2013 | 24273418 |
| invasion of the q2 mitochondrial variant of mediterranean bemisia tabaci in southern italy: possible role of bacterial endosymbionts. | the whitefly bemisia tabaci (gennadius) is a complex of cryptic species, some of which, namely the mediterranean (med) and the middle east-asia minor 1 (meam1), are highly invasive and injurious crop pests worldwide and able to displace local genotypes. invasiveness of b. tabaci may depend on the phenotype of inherited bacterial endosymbionts. here, the b. tabaci genetic diversity variation that has occurred in recent years in southern italy was examined. whitefly was genotyped by restriction fr ... | 2014 | 24272923 |
| two cytochrome p450 genes are involved in imidacloprid resistance in field populations of the whitefly, bemisia tabaci, in china. | the sweet potato whitefly, bemisia tabaci (gennadius) (hemiptera:aleyrodidae), is an invasive and damaging pest of field crops worldwide. the neonicotinoid insecticide imidacloprid has been widely used to control this pest. we assessed the species composition (b vs. q), imidacloprid resistance, and association between imidacloprid resistance and the expression of five p450 genes for 14-17 b. tabaci populations in 12 provinces in china. fifteen of 17 populations contained only b. tabaci q, and tw ... | 2013 | 24267696 |
| population variability of bemisia tabaci (genn.) in different hosts. | the silverleaf whitefly, bemisia tabaci (genn.) (hemiptera: aleyrodidae), is a cryptic species complex that contains some of the most damaging pests in tropical and subtropical regions. recent studies have indicated that this complex is composed of at least 24 distinct and morphologically indistinguishable species that mainly differ in their ability to transmit phytoviruses, adapt to hosts, and induce physiological changes in certain hosts. the importance of this species has been increasing worl ... | 2013 | 24222237 |
| wind-borne dispersal of a parasitoid: the process, the model, and its validation. | the aphelinid parasitoid eretmocerus hayati zolnerowich & rose (hymenoptera: aphelinidae) was recently released in australia as a biocontrol agent against the crop pest bemisia tabaci gennadius (hemiptera: aleyrodidae). it was found that the parasitoid can spread over several kilometers in a single generation and continue laying eggs for over a fortnight. a simple wind-advection model was fitted to emergence data from a first release between fassifern and kalbar, queensland, and its predictive a ... | 2013 | 24216288 |
| activation of the phenylpropanoid pathway in nicotiana tabacum improves the performance of the whitefly bemisia tabaci via reduced jasmonate signaling. | phloem-feeding insects can manipulate plant-induced resistance and are able to suppress effective jasmonic acid/ethylene (ja/et) defenses by the induction of inefficient salicylic acid (sa) based responses. as a result, activation of the phenylpropanoid biosynthesis pathway in transgenic plants is anticipated to cause complex interactions between phloem-feeding insects and their host plants due to predicted contradiction between two defense forces: the toxicity of various phenylpropanoids and th ... | 2013 | 24204646 |
| feeding experience of bemisia tabaci (hemiptera: aleyrodidae) affects their performance on different host plants. | the sweetpotato whitefly, bemisia tabaci biotype b is extremely polyphagous with >600 species of host plants. we hypothesized that previous experience of the whitefly on a given host plant affects their host selection and performance on the plants without previous experience. we investigated the host selection for feeding and oviposition of adults and development and survival of immatures of three host-plant-experienced populations of b. tabaci, namely bemisia-eggplant, bemisia-tomato and bemisi ... | 2013 | 24146985 |
| is agriculture driving the diversification of the bemisia tabaci species complex (hemiptera: sternorrhyncha: aleyrodidae)?: dating, diversification and biogeographic evidence revealed. | humans and insect herbivores are competing for the same food crops and have been for thousands of years. despite considerable advances in crop pest management, losses due to insects remain considerable. the global homogenisation of agriculture has supported the range expansion of numerous insect pests and has been driven in part by human-assisted dispersal supported through rapid global trade and low-cost air passenger transport. one of these pests, is the whitefly, bemisia tabaci, a cryptic spe ... | 2013 | 24138220 |
| plant-mediated changes in the feeding behavior of an invasive whitefly. | the invasive whitefly bemisia tabaci (gennadius) is a worldwide pest of agricultural crops that feeds on a wide variety of host plants. although host plant preference is known to vary among b. tabaci biotypes, far less is known about the potential for intraspecific divergence caused by long-term isolation on a single species of host plant. we tested the hypothesis that multigenerational isolation of b. tabaci b, a biotype that has been well-established in china for nearly two decades, on three d ... | 2013 | 24073848 |
| transmission efficiency of tomato apex necrosis virus by bemisia tabaci (hemiptera: aleyrodidae) biotype b in tomato. | tomato apex necrosis virus (toanv) is a new virus that causes important damage in tomato crops from the culiacan valley, sinaloa, mexico. to understand the relationship between toanv and its vector bermisia tabaci (hemiptera: aleyrodidae) (gennadius) biotype b, laboratory and greenhouse trials were completed to: 1) determine the acquisition and inoculation access periods of toanv by b. tabaci from tomato to tomato, 2) understand the transmission efficiency at different b. tabaci population densi ... | 2013 | 24020266 |
| yield and fibre quality associated with cotton leaf curl disease of bt-cotton in punjab. | cotton leaf curl disease (clcud), caused by gemini virus and transmitted through whitefly (bemisia tabaci) is a serious problem in northern india, affecting the productivity to a great extent. depending upon the severity of infection in susceptible varieties, the disease can cause upto 90.0 % yield losses besides this, it also causes deterioration in fibre quality. the objective of the present study was to determine the effect of cotton leaf curl disease on seed cotton yield and fibre characters ... | 2013 | 24006816 |
| comparative studies on the effects of bt-transgenic and nontransgenic cotton on arthropod diversity, seedcotton yield and bollworms control. | the effectiveness of commercial bt-cotton in pest management, influence on arthropod diversity, natural enemies, and toxin flow in the insect fauna under field conditions were studied keeping in view the need to assess bioefficacy and biosafety of bt-transgenic cotton. there were no significant differences in oviposition by helicoverpa armigera on bt-transgenic and non-transgenic cottons (9.2 versus 9.6 eggs plants(-100)), while the numbers of h. armigera larvae were significantly more on non-tr ... | 2013 | 24006809 |
| differences in insect resistance between tomato species endemic to the galapagos islands. | the galapagos islands constitute a highly diverse ecosystem and a unique source of variation in the form of endemic species. there are two endemic tomato species, solanum galapagense and s. cheesmaniae and two introduced tomato species, s. pimpinellifolium and s. lycopersicum. morphologically the two endemic tomato species of the galapagos islands are clearly distinct, but molecular marker analysis showed no clear separation. tomatoes on the galapagos are affected by both native and exotic herbi ... | 2013 | 23972016 |
| the bemisia tabaci species complex: additions from different parts of the world. | bemisia tabaci is one of the most threatening pests in many crops. we sequenced part of the mitochondrial cytochrome oxidase i gene from fifty whitefly populations collected in indonesia, thailand, india and china. nineteen unique sequences (haplotypes) of the cytochrome oxidase i were identified in these populations. they were combined with sequences available in databases, resulting in a total of 407 haplotypes and analyzed together with nine outgroup accessions. a phylogenetic tree was calcul ... | 2013 | 23955997 |
| multiple generation effects of high temperature on the development and fecundity of bemisia tabaci (gennadius) (hemiptera: aleyrodidae) biotype b. | insects are ectotherms and their ability to resist temperature stress is limited. the immediate effects of sub-lethal heat stress on insects are well documented, but longer-term effects of such stresses are rarely reported. in this study, survival, development and reproduction of the whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae) biotype b, were compared over five consecutive generations at 27, 31 and 35 °c and for one generation at 37 °c. both temperature and generation significa ... | 2013 | 23955949 |
| diversity of secondary endosymbionts among different putative species of the whitefly bemisia tabaci. | endosymbionts are important components of arthropod biology. the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) is a cryptic species complex composed of ≥ 28 putative species. in addition to the primary endosymbiont portiera aleyrodidarum, six secondary endosymbionts (s-endosymbionts), hamiltonella, rickettsia, wolbachia, cardinium, arsenophonus and fritschea, have been identified in b. tabaci thus far. here, we tested five of the six s-endosymbiont lineages (excluding fritschea) f ... | 2013 | 23955860 |
| high variation in single nucleotide polymorphisms (snps) and insertions/deletions (indels) in the highly invasive bemisia tabaci (gennadius) (hemiptera: aleyrodidae) middle east-asia minor 1 (meam1). | bemisia tabaci (gennadius) (hemiptera: aleyrodidae) middle east-asia minor 1 (meam1) is invasive and adaptive to varied environments throughout the world. the adaptability is closely related to genomic variation such as single nucleotide polymorphisms (snps) and insertions/deletions (indels). in order to elucidate the feature of snps and indels in meam1, and reveal the association between snps/indels and adaptive capacity to various environments, a computational approach with qualitysnp was used ... | 2013 | 23949985 |
| response of bemisia tabaci genn. (hemiptera: aleyrodidae) biotype b to genotypes of pepper capsicum annuum (solanales: solanaceae). | bemisia tabaci genn. biotype b is a widely distributed plant pest that represents one of the major constraints for horticultural crop production. the purpose of the present work was to evaluate the oviposition preference, survivorship, and development of b. tabaci biotype b on semi-cultivated genotypes of capsicum annuum from southeast mexico. in free-choice experiments to evaluate the oviposition preference, lower number of eggs laid by b. tabaci biotype b was observed in the genotypes maax and ... | 2013 | 23949756 |
| comparative antifeedant activities of polygodial and pyrethrins against whiteflies (bemisia tabaci) and aphids (myzus persicae). | polygodial, a sesquiterpene dialdehyde of the drimane family, has been shown to have deterrent and antifeedant effects on various insect species, including myzus persicae (sulzer), spodoptera spp. and leptinotarsa decemlineata (say). this compound may have potential as a broad-spectrum biocontrol agent, similar to pyrethrins, given that it was previously reported to improve yield when sprayed on barley fields. | 2014 | 23868321 |
| selection of endogenous reference genes for gene expression analysis in the mediterranean species of the bemisia tabaci (hemiptera: aleyrodidae) complex. | quantitative real-time reverse transcription polymerase chain reaction is widely used for gene expression analysis, and robust normalization against stably expressed endogenous reference genes (ergs) is necessary to obtain accurate results. in this study, the stability of nine housekeeping genes of the sweetpotato whitefly, bemisia tabaci (hemiptera: aleyrodidae) mediterranean were evaluated in various conditions by quantitative real-time reverse transcription polymerase chain reaction using gen ... | 2013 | 23865213 |
| detection of resistance, cross-resistance, and stability of resistance to new chemistry insecticides in bemisia tabaci (homoptera: aleyrodidae). | resistance levels in whitefly, bemisia tabaci (gennadius) collections from cotton and sunflower (up to four districts) for five neonicotinoids and two insect growth regulators (igrs) were investigated for two consecutive years. based on the lc50(s), all collections showed slight to moderate levels of resistance for the tested insecticides compared with the laboratory susceptible population. the data also indicated that cotton and sunflower collections had similar resistance levels. in comparison ... | 2013 | 23865209 |
| monitoring changes in bemisia tabaci (hemiptera: aleyrodidae) susceptibility to neonicotinoid insecticides in arizona and california. | bemisia tabaci (gennadius) biotype b is a highly prolific and polyphagous whitefly that established in much of north america during the 1980s. neonicotinoid insecticides have been fundamental in regaining control over outbreak populations of b. tabaci, but resistance threatens their sustainability. susceptibility of b. tabaci in the southwestern united states to four neonicotinoid insecticides varied considerably across populations within each year over a 3 yr period. using a variability ratio o ... | 2013 | 23865208 |
| effects of high-gossypol cotton on the development and reproduction of bemisia tabaci (hemiptera: aleyrodidae) meam1 cryptic species. | use of plant secondary metabolic compounds is an important method for insect pest control. in this study, the survival, development, and reproduction of bemisia tabaci (gennadius) (hemiptera: aleyrodidae) meam1 cryptic species were compared over two consecutive generations on three cotton cultivars of different gossypol levels. both cotton cultivar and generation significantly affected the fitness of the whitefly. in both generations, the immature development times on the low-gossypol cultivar z ... | 2013 | 23865205 |
| population genetics of invasive bemisia tabaci (hemiptera: aleyrodidae) cryptic species in the united states based on microsatellite markers. | the bemisia tabaci (gennadius) (hemiptera: aleyrodidae) cryptic species complex of whiteflies contains two species, meam1 and med, that are highly invasive in supportive climates the world over. in the united states, meam1 occurs both in the field and in the greenhouse, but med is only found in the greenhouse. to make inferences about the population structure of both species, and the origin and recent spread of med within the united states, 987 meam1 whiteflies and 340 med whiteflies were genoty ... | 2013 | 23865202 |
| relative influence of plant quality and natural enemies on the seasonal dynamics of bemisia tabaci (hemiptera: aleyrodidae) in cotton. | the abundance and distribution of insect herbivores is determined by, among other things, plant quality and natural enemies. these two factors vary temporally and spatially, subsequently affecting seasonal population dynamics. the relative influence of plant quality and natural enemies on the seasonal dynamics of bemisia tabaci (gennadius) was investigated in a 3-yr field study in cotton. plant quality was manipulated through varying irrigation regimes: irrigations done at 20, 40, and 60% soil w ... | 2013 | 23865191 |
| spatiotemporal patterns of induced resistance and susceptibility linking diverse plant parasites. | induced defenses mediate interactions between parasites sharing the same host plant, but the outcomes of these interactions are challenging to predict because of spatiotemporal variation in plant responses and differences in defense pathways elicited by herbivores or pathogens. dissecting these mediating factors necessitates an approach that encompasses a diversity of parasitic feeding styles and tracks interactions over space and time. we tested indirect plant-mediated relationships across thre ... | 2013 | 23851986 |
| evolution and homoplasy at the bem6 microsatellite locus in three sweetpotato whitefly (bemisia tabaci) cryptic species. | the evolution of individual microsatellite loci is often complex and homoplasy is common but often goes undetected. sequencing alleles at a microsatellite locus can provide a more complete picture of the common evolutionary mechanisms occurring at that locus and can reveal cases of homoplasy. within species homoplasy can lead to an underestimate of differentiation among populations and among species homoplasy can produce a misleading interpretation regarding shared alleles and hybridization. thi ... | 2013 | 23819589 |
| use of fluorescence, a novel technique to determine reduction in bemisia tabaci (hemiptera: aleyrodidae) nymph feeding when exposed to benevia and other insecticides. | the sweet potato whitefly, bemisia tabaci (gennadius), is an economically important pest in the united states and other countries. growers in many places rely on the use of insecticides to reduce populations of b. tabaci. however, insecticides may take a few days to cause b. tabaci mortality and some do not reduce feeding before death. earlier reduction of feeding of whiteflies would decrease the physiological effects on plants, reduce the production of sooty mold and potentially reduce the tran ... | 2013 | 23786044 |
| the characteristics and expression profiles of the mitochondrial genome for the mediterranean species of the bemisia tabaci complex. | the whiteflies under the name bemisia tabaci (gennadius) (aleyrodidae: hemiptera) are species complex of at least 31 cryptic species some of which are globally invasive agricultural pests. previously, the mitochondrial genome (mitogenome) of the indigenous new world b. tabaci species was sequenced and major differences of gene order from the postulated whitefly ancestral gene order were found. however, the sequence and gene order of mitogenomes in other b. tabaci species are unknown. in addition ... | 2013 | 23768425 |
| relative amount of symbionts in bemisia tabaci (gennadius) q changes with host plant and establishing the method of analyzing free amino acid in b. tabaci. | the impact of symbionts on their insect hosts depends on their infection density. in the current study, we investigated the effects of host plants (cucumber, cabbage, and cotton) on the relative amount of symbionts portiera and hamiltonella in the whitefly bemisia tabaci (gennadius) q. the relative amounts of symbionts in 3 host plant b. tabaci q populations with the same genetic background were evaluated by quantitative pcr. the whiteflies of cabbage population harbored more portiera than those ... | 2013 | 23750302 |
| silencing the ecdysone synthesis and signaling pathway genes disrupts nymphal development in the whitefly. | sap-sucking insects are important pests in agriculture and good models to study insect biology. the role of ecdysone pathway genes in the life history of this group of insects is largely unknown likely due to a lack of efficient gene silencing methods allowing functional genetic analyses. here, we developed a new and high throughput method to silence whitefly genes using a leaf-mediated dsrna feeding method. we have applied this method to explore the roles of genes within the molting hormone-ecd ... | 2013 | 23748027 |
| taxonomic status of the bemisia tabaci complex (hemiptera: aleyrodidae) and reassessment of the number of its constituent species. | bemisia tabaci (hemiptera: aleyrodidae) is one of the most important insect pests in the world. in the present study, the taxonomic status of b. tabaci and the number of species composing the b. tabaci complex were determined based on 1059 coi sequences of b. tabaci and 509 coi sequences of 153 hemipteran species. the genetic divergence within b. tabaci was conspicuously higher (on average, 11.1%) than interspecific genetic divergence within the respective genera of the 153 species (on average, ... | 2013 | 23675507 |
| a quantum dot-immunofluorescent labeling method to investigate the interactions between a crinivirus and its whitefly vector. | successful vector-mediated plant virus transmission entails an intricate but poorly understood interplay of interactions among virus, vector, and plant. the complexity of interactions requires continually improving/evaluating tools and methods for investigating the determinants that are central to mediating virus transmission. a recent study using an organic fluorophore (alexa fluor)-based immunofluorescent localization assay demonstrated that specific retention of lettuce infectious yellows vir ... | 2013 | 23577009 |
| investigating contact toxicity of geranium and artemisia essential oils on bemisia tabaci gen. | sweet potato whitefly, bemisia tabaci gen. (b. tabaci), is one of the most important pests of various greenhouse crops in iran. nowadays, chemical insecticides are broadly used for control of the pests that causes risk to consumer's health. for the first time, contact toxicity of pelargonium roseum andrews and artemisia sieberi besser essential oils on b. tabaci and its possible application against the whitefly was evaluated in 2012. | 2013 | 25050264 |
| immature development of eretmocerus mundus (hymenoptera: aphelinidae). | the development from egg to pupation is followed for the wasp eretmocerus mundus, parasitizing the whitefly bemisia tabaci. we elucidate and describe structural details, histological developments and changes that the different parasitoid and host tissues have undergone during parasitism. these include the presence and apparent function of very large salivary glands, which probably produce substances that help to regulate the host's decomposition and parasitoid nutrition. moreover, the gut of all ... | 2013 | 23523739 |
| assessment of potential sublethal effects of various insecticides on key biological traits of the tobacco whitefly, bemisia tabaci. | the tobacco whitefly bemisia tabaci is one of the most devastating pests worldwide. current management of b. tabaci relies upon the frequent applications of insecticides. in addition to direct mortality by typical acute toxicity (lethal effect), insecticides may also impair various key biological traits of the exposed insects through physiological and behavioral sublethal effects. identifying and characterizing such effects could be crucial for understanding the global effects of insecticides on ... | 2013 | 23494876 |
| brazilian begomovirus populations are highly recombinant, rapidly evolving, and segregated based on geographical location. | the incidence of begomovirus infections in crop plants sharply increased in brazil during the 1990s following the introduction of the invasive b biotype of the whitefly vector, bemisia tabaci. it is believed that this biotype transmitted begomoviruses from noncultivated plants to crop species with greater efficiency than indigenous b. tabaci biotypes. either through rapid host adaptation or selection pressure in genetically diverse populations of noncultivated hosts, over the past 20 years vario ... | 2013 | 23487451 |
| competitive displacement between two invasive whiteflies: insecticide application and host plant effects. | the cryptic species middle east-asia minor 1 (meam1), formerly referred to as 'b biotype', of the whitefly bemisia tabaci complex entered china in the mid 1990s, and the mediterranean (med) cryptic species, formerly referred to as 'q biotype', of the same whitefly complex entered china around 2003. field surveys in china after 2003 indicate that in many regions med has been replacing the earlier invader meam1. the factors underlying this displacement are unclear. we conducted laboratory experime ... | 2013 | 23458717 |
| are yellow sticky traps an effective method for control of sweetpotato whitefly, bemisia tabaci, in the greenhouse or field? | yellow sticky traps are a common method for monitoring many pests, but it has not been shown whether they could be used as a control method. in this study the impact of yellow sticky traps on the population dynamics of the sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae) was determined in the greenhouse and field. in the greenhouse, yellow sticky traps significantly suppressed the population increase of adult and immature whiteflies. the whitefly densities in the greenho ... | 2012 | 23445077 |
| relative amount of symbionts in insect hosts changes with host-plant adaptation and insecticide resistance. | the impact of symbionts on their hosts depends on their infection density. in the current study, we investigated the effects of host plant and insecticide resistance on the relative amount of symbionts portiera, hamiltonella, rickettsia, and cardinium in the whitefly bemisia tabaci (gennadius) b biotype. the relative amount of symbionts in three host plant-adapted subpopulations (cucumber, cucumis sativus l.; cabbage, brassica oleracea l.; and cotton, gossypium herbaceum l.) with the same geneti ... | 2013 | 23339787 |
| pymetrozine is hydroxylated by cyp6cm1, a cytochrome p450 conferring neonicotinoid resistance in bemisia tabaci. | resistance to neonicotinoid insecticides such as imidacloprid in the cotton whitefly, bemisia tabaci, is linked to its hydroxylation by constitutively overexpressed cyp6cm1, a cytochrome p450 enzyme. here, an investigation was conducted to establish whether cyp6cm1 functionally expressed in sf9 cells also detoxifies pymetrozine, a selective homopteran feeding blocker known to be cross-resistant to neonicotinoids in whiteflies. | 2013 | 23325724 |
| multi-generation life tables of bemisia tabaci (gennadius) biotype b (hemiptera: aleyrodidae) under high-temperature stress. | much attention has been focused on insects' ability to survive long-term high-temperature stress and on their resulting population distributions under global warming. in this study, life tables of the whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae) biotype b, were collected over five consecutive generations at 27, 31, and 35°c and for one generation at 37°c. at 37°c, the intrinsic rate of increase (r) and the net reproductive rate (r(0)) of the whitefly were 0.0383 d(-1) and 2.8 of ... | 2012 | 23321117 |
| reduction in the fitness of bemisia tabaci fed on three previously infested tomato genotypes differing in the jasmonic acid pathway. | the effect of previous infestation (preconditioning) by the whitefly bemisia tabaci (gennadius) biotype b on the population fitness of subsequent infestations that fed on three isogenic tomato genotypes (wild-type [wt], a jasmonic acid [ja] defense-enhanced genotype [35s], and a ja-deficient genotype [spr2]) was examined. we tested the hypotheses that whiteflies fed on preconditioned tomatoes (solanum lycopersicum l.) would have reduced fitness and that the effect would be mediated via the ja-de ... | 2012 | 23321091 |
| evidence for horizontal transmission of secondary endosymbionts in the bemisia tabaci cryptic species complex. | bemisia tabaci (hemiptera: aleyrodidae) is a globally distributed pest composed of at least 34 morphologically indistinguishable cryptic species. at least seven species of endosymbiont have been found infecting some or all members of the complex. the origin(s) of the associations between specific endosymbionts and their whitefly hosts is unknown. infection is normally vertical, but horizontal transmission does occur and is one way for new infections to be introduced into individuals. the relatio ... | 2013 | 23308142 |
| reference gene selection for qrt-pcr analysis in the sweetpotato whitefly, bemisia tabaci (hemiptera: aleyrodidae). | accurate evaluation of gene expression requires normalization relative to the expression of reliable reference genes. expression levels of "classical" reference genes can differ, however, across experimental conditions. although quantitative real-time pcr (qrt-pcr) has been used extensively to decipher gene function in the sweetpotato whitefly bemisia tabaci, a world-wide pest in many agricultural systems, the stability of its reference genes has rarely been validated. | 2013 | 23308130 |
| [effects of the volatiles from different tomato varieties on host selection behavior of b-biotype bemisia tabaci]. | by the methods of headspace solid-phase micro extraction and gas chromatography-mass spectrometry, and using y-type olfactometer, this paper identified the volatiles from six tomato varieties (zheza 809, zheza 203, hezuo 903, kate no. 1, huangtuoyan, and jinfei), and bio-assayed the olfactory responses of female b-biotype bemisia tabaci to the tomato plants and their released volatiles. thirteen kinds of compounds in the volatiles collected from the six tomato varieties were identified, among wh ... | 2012 | 23286009 |
| low polymorphism revealed in new microsatellite markers for bemisia tabaci (hemiptera: aleyrodidae). | the silverleaf whitefly (bemisia tabaci) is actually a complex of morphologically indistinct species that vary in their capacity to transmit plant viruses and to induce physiological disorders in plants of economic importance. the worldwide impact of this whitefly has increased greatly, as it is a vector of various types of phytovirus, especially geminiviruses, in plants of economic importance. the adaptability of b. tabaci to many regions of the world has fostered the appearance of various biot ... | 2012 | 23212329 |
| will the real bemisia tabaci please stand up? | since panayiotis gennadius first identified the whitefly, aleyrodes tabaci in 1889, there have been numerous revisions of the taxonomy of what has since become one of the world's most damaging insect pests. most of the taxonomic revisions have been based on synonymising different species under the name bemisia tabaci. it is now considered that there is sufficient biological, behavioural and molecular genetic data to support its being a cryptic species complex composed of at least 34 morphologica ... | 2012 | 23209778 |
| cross-resistance relationships of the sulfoximine insecticide sulfoxaflor with neonicotinoids and other insecticides in the whiteflies bemisia tabaci and trialeurodes vaporariorum. | insecticides are important tools for managing damaging insect pests. compounds that are effective against pests such as the whiteflies bemisia tabaci and trialeurodes vaporariorum, which show resistance to a range of insecticidal modes of action (moa), have particular value as components of resistance management programmes. the sulfoximine insecticides are chemically unique as the first to incorporate a sulfoximine functional group. sulfoxaflor is the first sulfoximine compound under commercial ... | 2013 | 23203347 |
| genetic diversity and geographic distribution of bemisia tabaci (gennadius) (hemiptera: aleyrodidae) genotypes associated with cassava in east africa. | the genetic variability of whitefly (bemisia tabaci) species, the vectors of cassava mosaic begomoviruses (cmbs) in cassava growing areas of kenya, tanzania, and uganda, was investigated through comparison of partial sequences of the mitochondria cytochrome oxidase i (mtcoi) dna in 2010/11. two distinct species were obtained including sub-saharan africa 1 (ssa1), comprising of two sub-clades (i and ii), and a south west indian ocean islands (swio) species. among the ssa1, sub-clade i sequences s ... | 2012 | 23170210 |
| genome sequences of the primary endosymbiont "candidatus portiera aleyrodidarum" in the whitefly bemisia tabaci b and q biotypes. | "candidatus portiera aleyrodidarum" is the obligate primary endosymbiotic bacterium of whiteflies, including the sweet potato whitefly bemisia tabaci, and provides essential nutrients to its host. here we report two complete genome sequences of this bacterium from the b and q biotypes of b. tabaci. | 2012 | 23144417 |
| complete genome sequence of "candidatus portiera aleyrodidarum" bt-qvlc, an obligate symbiont that supplies amino acids and carotenoids to bemisia tabaci. | the genome of "candidatus portiera aleyrodidarum," the primary endosymbiont of the whitefly bemisia tabaci (mediterranean species), is reported. it presents a reduced genome (357 kb) encoding the capability to synthetize, or participate in the synthesis of, several amino acids and carotenoids, being the first insect endosymbiont capable of supplying carotenoids. | 2012 | 23144402 |
| characterization of a newly discovered symbiont of the whitefly bemisia tabaci (hemiptera: aleyrodidae). | bemisia tabaci (hemiptera: aleyrodidae) is a species complex containing >28 cryptic species, some of which are important crop pests worldwide. like many other sap-sucking insects, whiteflies harbor an obligatory symbiont, "candidatus portiera aleyrodidarum," and a number of secondary symbionts. so far, six genera of secondary symbionts have been identified in b. tabaci. in this study, we report and describe the finding of an additional bacterium in the indigenous b. tabaci cryptic species china ... | 2013 | 23144129 |
| suitability changes with host leaf age for bemisia tabaci b biotype and trialeurodes vaporariorum. | the suitability of tomato leaves of different ages for bemisia tabaci (gennadius) b biotype and trialeurodes vaporariorum (westwood) was characterized by development time, stage-specific survival, sex ratio, longevity, and fecundity. three categories of leaf ages were tested (young: expanding leaves <2 wk old; mature: fully expanded, 4-5-wk-old leaves; old: fully expanded, 6-7-wk-old leaves). there was no significant variation in the duration of development of the two species among the three cla ... | 2012 | 23068168 |
| sex affects the infection frequencies of symbionts in bemisia tabaci. | while biotype, host plant and geographical location are known to affect the infection dynamics of the six secondary symbionts (s-symbionts) including hamiltonella, arsenophonus, cardinium, wolbachia, rickettsia and fritschea in bemisia tabaci, it remains unclear whether sex of b. tabaci has an impact on the infection frequencies of the six s-symbionts. to address this issue, gene-specific pcr were conducted to screen for the presence of the six s-symbionts in five host plant-adapted laboratory s ... | 2012 | 23060956 |
| analysis of a native whitefly transcriptome and its sequence divergence with two invasive whitefly species. | genomic divergence between invasive and native species may provide insight into the molecular basis underlying specific characteristics that drive the invasion and displacement of closely related species. in this study, we sequenced the transcriptome of an indigenous species, asia ii 3, of the bemisia tabaci complex and compared its genetic divergence with the transcriptomes of two invasive whiteflies species, middle east asia minor 1 (meam1) and mediterranean (med), respectively. | 2012 | 23036081 |
| endosymbiotic bacteria as a source of carotenoids in whiteflies. | although carotenoids serve important biological functions, animals are generally unable to synthesize these pigments and instead obtain them from food. however, many animals, such as sap-feeding insects, may have limited access to carotenoids in their diet, and it was recently shown that aphids have acquired the ability to produce carotenoids by lateral transfer of fungal genes. whiteflies also contain carotenoids but show no evidence of the fungus-derived genes found in aphids. because many sap ... | 2012 | 22977066 |
| resistance mechanisms to chlorpyrifos and f392w mutation frequencies in the acetylcholine esterase ace1 allele of field populations of the tobacco whitefly, bemisia tabaci in china. | the tobacco whitefly b-biotype bemisia tabaci gennadius (hemiptera: aleyrodidae) is a worldwide pest of many crops. in china, chlorpyrifos has been used to control this insect for many years and is still being used despite the fact that some resistance has been reported. to combat resistance and maintain good control efficiency of chlorpyrifos, it is essential to understand resistance mechanisms. a chlorpyrifos resistant tobacco whitefly strain (nj-r) and a susceptible strain (nj-s) were derived ... | 2012 | 22954331 |
| lack of fitness costs associated with acetamiprid resistance in bemisia tabaci (hemiptera: aleyrodidae). | sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), is a devastating pest that can cause severe damage to a range of crops by direct feeding and by plant virus transmission. because of indiscriminate use of insecticides, this whitefly has developed resistance to several insecticides, including neonicotinoids. our objectives were to determine fitness components affected by acetamiprid resistance in b. tabaci. assay results showed that selection with acetamiprid had removed ... | 2012 | 22928322 |
| fluctuations in peroxidase and catalase activities of resistant and susceptible black gram (vigna mungo (l.) hepper) genotypes elicited by bemisia tabaci (gennadius) feeding. | whitefly, bemisia tabaci (gennadius) (hemiptera: aleryrodidae), is a serious pest of black gram, (vigna mungo (l.) hepper), an important legume pulse crop grown in north india. this research investigated the potential role of selected plant oxidative enzymes in resistance/susceptibility to whitefly in nine black gram genotypes. oxidative enzyme activity was estimated spectrophotometrically from leaf samples collected at 30 and 50 d after sowing (das) from whitefly infested and uninfested plants. ... | 2012 | 22902801 |
| asymmetric adaptation to indolic and aliphatic glucosinolates in the b and q sibling species of bemisia tabaci (hemiptera: aleyrodidae). | the role glucosinolates play in defending plants against phloem feeders such as aphids and whiteflies is currently not clear as these herbivores may avoid bringing glucosinolates from the phloem sap into contact with myrosinase enzymes. here, we investigated the effects of high levels of aliphatic and indolic glucosinolates on life history traits and detoxification gene expression in two sibling species, b and q, of the whitefly bemisia tabaci. high levels of aliphatic glucosinolates decreased t ... | 2012 | 22849567 |
| shifting preference between oviposition vs. host-feeding under changing host densities in two aphelinid parasitoids. | destructive host-feeding is common in hymenopteran parasitoids. such feeding may be restricted to host stages not preferred for oviposition. however, whether this is a fixed strategy or can vary according to resource levels or parasitoid needs is less clear. we tested the trade-off between host feeding and oviposition on two whitefly parasitoids under varying host densities. females of two aphelinid parasitoids, eretmocerus hayati and encarsia sophia were exposed to nine different densities of t ... | 2012 | 22815964 |
| influence of plant combinations on population characteristics of bemisia tabaci biotypes b and q. | in recent years, the dominant biotype of bemisia tabaci (gennadius) has shifted from biotype b to q in many locations of china. our field monitoring showed that b. tabaci biotype q could be found on pepper capsicum frutescens l. while biotype b could not be found on the plant. to study the role of the host plant in the displacement of biotype b by q, the adult mortality, female fecundity, and adult emergence of both biotypes b and q on different host combinations were studied using a model syste ... | 2012 | 22812132 |
| distribution of bemisia tabaci (hemiptera: aleyrodidae) biotypes in north america after the q invasion. | after the 2004 discovery of the bemisia tabaci (gennadius) (hemiptera aleyrodidae) q biotype in the united states, there was a vital need to determine the geographical and host distribution as well as its interaction with the resident b biotype because of its innate ability to rapidly develop high-level insecticide resistance that persists in the absence of exposure. as part of a coordinated country-wide effort, an extensive survey of b. tabaci biotypes was conducted in north america, with the c ... | 2012 | 22812110 |
| adult survival of delphastus catalinae (coleoptera: coccinellidae), a predator of whiteflies (hemiptera: aleyrodidae), on diets of whiteflies, honeydew, and honey. | delphastus catalinae (horn) is a coccinellid predator that is commercially sold for the management of whiteflies. a study was conducted to assay the effect of selected diets on the survival of adult d. catalinae. treatments of water (as a control), 10% honey, honeydew, and whiteflies [bemisia tabaci (gennadius)] were provided to the beetles in laboratory assays. newly emerged, unfed adult insects were used at the start of a survival experiment with trials lasting 50 d. another survival experimen ... | 2012 | 22732626 |
| difference in feeding behaviors of two invasive whiteflies on host plants with different suitability: implication for competitive displacement. | in china, bemisia tabaci q (commonly known as biotype q) has rapidly displaced b (commonly known as biotype b) in the past 6 years. the mechanisms underlying such phenomenon have been studied extensively in recent years; however, we have not come to a definitive conclusion yet. in the present study, the differences in host suitability between b and q whitefly adults to five host plants (cabbage, cotton, cucumber, poinsettia, and tomato) were evaluated based on their respective feeding behaviors ... | 2012 | 22701340 |
| diversity and localization of bacterial symbionts in three whitefly species (hemiptera: aleyrodidae) from the east coast of the adriatic sea. | several whitefly species (hemiptera: aleyrodidae) are cosmopolitan phloem-feeders that cause serious damage in numerous agricultural crops. all whitefly species harbor a primary bacterial symbiont and a diverse array of secondary symbionts which may influence several aspects of the insect's biology. we surveyed infections by secondary symbionts in bemisia tabaci (gennadius), trialeurodes vaporariorum (westwood) and siphoninus phillyreae (haliday) from areas in the east cost of the adriatic sea. ... | 2013 | 22698088 |
| draft genome sequence of "candidatus hamiltonella defensa," an endosymbiont of the whitefly bemisia tabaci. | "candidatus hamiltonella defensa" is a facultative endosymbiont of the whitefly bemisia tabaci. herein, we report the first draft genome sequence of "candidatus hamiltonella defensa" from the invasive mediterranean cryptic species of the b. tabaci complex. the 1.84-mbp genome sequence comprises 404 contigs and contains 1,806 predicted protein-coding genes. | 2012 | 22689243 |
| short-term and transgenerational effects of the neonicotinoid nitenpyram on susceptibility to insecticides in two whitefly species. | the cosmopolitan silverleaf whitefly, bemisia tabaci which had coexisted with trialeurodes vaporariorum in northern china for many years, has become the dominant species in the last years. recent reports show that it is gradually displacing the other greenhouse whitefly species. neonicotinoid, which includes nitenpyram, is a major group of insecticides used against whiteflies in various crops. when exposed to low doses of insecticides, insects may develop resistance by adapting physiologically. ... | 2012 | 22661314 |
| lna probes substantially improve the detection of bacterial endosymbionts in whole mount of insects by fluorescent in-situ hybridization. | detection of unculturable bacteria and their localization in the host, by fluorescent in-situ hybridization (fish), is a powerful technique in the study of host-bacteria interaction. fish probes are designed to target the 16 s rrna region of the bacteria to be detected. lna probes have recently been used in fish studies and proven to be more efficient. to date no report has employed lna probes for fish detection of bacterial endosymbiont in the whole mount tissues. further, though speculated, ba ... | 2012 | 22624773 |
| interactions of light intensity, insecticide concentration, and time on the efficacy of systemic insecticides in suppressing populations of the sweetpotato whitefly (hemiptera: aleyrodidae) and the citrus mealybug (hemiptera: pseudococcidae). | the impact of light intensity on the uptake and persistence of the systemic neonicotinoid insecticides, imidacloprid and dinotefuran, were evaluated in poinsettia (euphorbia pulcherrima willd.) and yellow sage (lantana camara l.). insecticide residues were measured in leaves sampled from the treated plants at four time intervals after treatment to determine the relationship between insecticide concentration and efficacy against two insect pests: sweetpotato whitefly, bemisia tabaci gennadius, an ... | 2012 | 22606821 |
| [biological activity of capsaicin and its effects on development and fecundity in bemisia tabaci (gennadius) (hemiptera: aleyrodidae)]. | biological activity of capsaicin and its effects on development and fecundity in bemisia tabaci were tested in the laboratory. the results showed that capsaicin induced direct mortality in different developmental stages of b. tabaci, and the mortality of whiteflies were significantly dosage-dependent. the toxicity of capsaicin to different developmental stages of b. tabaci by either leaf-dip or egg/larval-dip bioassays (the lc50 for adult, egg and nymph were 3525.79, 1603.29 and 1526.27 mg x l(- ... | 2012 | 22586983 |
| loop-mediated isothermal amplification for rapid identification of biotypes b and q of the globally invasive pest bemisia tabaci, and studying population dynamics. | bemisia tabaci, the sweetpotato whitefly, is a globally invasive pest that causes serious agricultural damage by transmitting plant viruses. this pest forms a cryptic species complex that displays morphologically indistinguishable biotypes. among them, the b and q biotypes are the most important pests worldwide. because they have different levels of insecticide resistance, these biotypes must be identified in order to achieve proper pest control. therefore, a convenient, rapid and specific detec ... | 2012 | 22566408 |
| [development of insecticide resistance and its effect factors in field population of bemisia tabaci in fujian province, east china]. | abstract: the development of insecticide resistance in field populations of bemisia tabaci from different regions of fujian province, china were monitored with adult leaf-dipping bioassay. compared with bioassay data of 2005, all field populations tested in 2009 still had high levels of resistance to the lambda-cyhalothrin, fenpropathrin and chlorpyrifos, low levels of resistance to methomyl, and no resistance to abamectin. however, resistance to the neonicotinoids imidacloprid and thiamethoxam ... | 2012 | 22489509 |
| lethal effect of imidacloprid on the coccinellid predator serangium japonicum and sublethal effects on predator voracity and on functional response to the whitefly bemisia tabaci. | neonicotinoid insecticides are widely used for controlling sucking pests, and sublethal effects can be expected in beneficial arthropods like natural enemies. serangium japonicum is an important predator in many agricultural systems in china, and a potential biological control agent against bemisia tabaci. we evaluated the toxicity of imidacloprid to s. japonicum and its impact on the functional response to b. tabaci eggs. s. japonicum adults exposed through contact to dried residues of imidaclo ... | 2012 | 22447470 |
| rapid genetic turnover in populations of the insect pest bemisia tabaci middle east: asia minor 1 in an agricultural landscape. | organisms differ greatly in dispersal ability, and landscapes differ in amenability to an organism's movement. thus, landscape structure and heterogeneity can affect genetic composition of populations. while many agricultural pests are known for their ability to disperse rapidly, it is unclear how fast and over what spatial scale insect pests might respond to the temporally dynamic agricultural landscapes they inhabit. we used population genetic analyses of a severe crop pest, a member of the be ... | 2012 | 22420748 |
| use of mitochondrial cytochrome oxidase i polymerase chain reaction-restriction fragment length polymorphism for identifying subclades of bemisia tabaci mediterranean group. | the mediterranean group (commonly known as q biotype; hereafter med) of the sweetpotato whitefly, bemisia tabaci (gennadius), originated in the mediterranean region, but it now has been found in at least 10 countries outside the mediterranean. collections of b. tabaci from some of these countries exhibit different pest behaviors and pesticide resistance characteristics, yet all may be classified as med. a phylogenetic analysis of 120 mitochondrial cytochrome oxidase i (mtcoi) sequences (jn966761 ... | 2012 | 22420277 |
| species within the bemisia tabaci (hemiptera: aleyrodidae) complex in soybean and bean crops in argentina. | the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) is a cryptic species complex that contains some of the most damaging pests in tropical and subtropical regions. recent studies suggested that this complex is composed of at least 24 distinct species. we use the approach from these studies to consider the identity of b. tabaci in argentina. previous studies have suggested the presence of a b. tabaci presumably indigenous to the americas and referred to as the br biotype in argentina ... | 2012 | 22420254 |
| differences in mating behavior lead to asymmetric mating interactions and consequential changes in sex ratio between an invasive and an indigenous whitefly. | the invasive b whitefly and the indigenous zhj2 whitefly in china of the bemisia tabaci complex represent two previously allopatric cryptic species. laboratory experiments have shown that the invasive b can displace the indigenous zhj2. here, we observed the mating behavior and mating interactions between b and zhj2 to elucidate the behavioral mechanisms underlying their competition. the 2 species are able to mate with each other, although at a significantly lower frequency than that between mal ... | 2012 | 22405444 |
| diverse population of a new bipartite begomovirus infecting tomato crops in uruguay. | several isolates of a novel begomovirus were characterized from tomato samples collected in northern uruguay exhibiting disease symptoms associated with bemisia tabaci infestations. analysis of full-length sequences of dna-a and dna-b components revealed the presence of a new begomovirus with the typical genome organization of a new world begomovirus, for which the name tomato rugose yellow leaf curl virus (torylcv) is proposed. a high degree of nucleotide sequence diversity was found for both c ... | 2012 | 22383056 |
| roles of mating behavioural interactions and life history traits in the competition between alien and indigenous whiteflies. | interference competition between closely related alien and indigenous species often influences the outcome of biological invasions. the whitefly bemisia tabaci species complex contains ≥28 putative species and two of them, mediterranean (med, formally referred to as the 'q biotype') and middle east-asia minor 1 (meam1, formally referred to as the 'b biotype'), have recently spread to much of the world. in many invaded regions, these species have displaced closely related indigenous whitefly spec ... | 2012 | 22377396 |
| evidence of diversity and recombination in arsenophonus symbionts of the bemisia tabaci species complex. | maternally inherited bacterial symbionts infecting arthropods have major implications on host ecology and evolution. among them, the genus arsenophonus is particularly characterized by a large host spectrum and a wide range of symbiotic relationships (from mutualism to parasitism), making it a good model to study the evolution of host-symbiont associations. however, few data are available on the diversity and distribution of arsenophonus within host lineages. here, we propose a survey on arsenop ... | 2012 | 22375811 |
| residue and bio-efficacy evaluation of controlled release formulations of imidacloprid against pests in soybean (glycine max). | controlled release (cr) formulations of imidacloprid (1-(6 chloro-3-pyridinyl methyl)-n- nitro imidazolidin-2- ylideneamine) were prepared using novel amphiphilic polymers synthesized from polyethylene glycol and aliphatic diacids employing encapsulation technique. the bioefficacy of the prepared cr formulations was evaluated against major pests of soybean, namely stem fly, melanagromyza sojae zehntmer and white fly, bemisia tabaci gennadius along with a commercial formulation at the experimenta ... | 2012 | 22375595 |
| trophic relationships between predators, whiteflies and their parasitoids in tomato greenhouses: a molecular approach. | the whiteflies bemisia tabaci gennadius and trialeurodes vaporariorum (westwood) (hemiptera: aleyrodidae) are two of the main pests in tomato crops. their biological control in mediterranean ipm systems is based on the predators macrolophus pygmaeus (rambur) and nesidiocoris tenuis reuter (hemiptera: miridae), as well as on the parasitoids eretmocerus mundus (mercet) and encarsia pergandiella howard (hymenoptera: aphelinidae). these natural enemies may interact with each other and their joint us ... | 2012 | 22314013 |
| diversity and phylogenetic analysis of endosymbiotic bacteria from field caught bemisia tabaci from different locations of north india based on 16s rdna library screening. | bemisia tabaci is the major vector pest of agricultural crops all over the world. in this study we report the different bacterial endosymbionts associated with b. tabaci sampled from 14 different locations in north india. using 16s rdna clone library sequences we were able to identify portiera, the primary endosymbiont of b. tabaci, and other secondary endosymbionts like cardinium, wolbachia, rickettsia and arsenophonus. along with these we also detected bacillus, enterobacter, paracoccus and ac ... | 2012 | 22293464 |
| population genetic structure and secondary endosymbionts of q bemisia tabaci (hemiptera: aleyrodidae) from greece. | we investigated the molecular diversity of the major agricultural pest bemisia tabaci and of its associated secondary endosymbionts in greece. analyzing mitochondrial dna, we found that the q1 (=q west) is predominant. we used eight microsatellite polymorphic markers to study the genetic structure of 37 populations from mainland and insular greece, collected on different host species from outdoor and protected crops as well as from non-cultivated plants. in some cases, gene flow was found to be ... | 2012 | 22280837 |
| species delimitation and global biosecurity. | species delimitation directly impacts on global biosecurity. it is a critical element in the decisions made by national governments in regard to the flow of trade and to the biosecurity measures imposed to protect countries from the threat of invasive species. here we outline a novel approach to species delimitation, "tip to root", for two highly invasive insect pests, bemisia tabaci (sweetpotato whitefly) and lymantria dispar (asian gypsy moth). both species are of concern to biosecurity, but i ... | 2012 | 22267902 |
| extensive settlement of the invasive meam1 population of bemisia tabaci (hemiptera: aleyrodidae) in the caribbean and rare detection of indigenous populations. | bemisia tabaci populations belonging to middle east-asia minor one (meam1) and mediterranean (med) groups (formerly biotype b and q, respectively) have spread throughout the world. although the introduction of meam1 is documented from several caribbean islands, it is generally not known whether med has also been introduced; whether indigenous populations have survived; and if in the affirmative, to which group(s) they belonged. whiteflies were collected from seven islands on various plant specie ... | 2011 | 22251711 |
| preliminary studies of effectiveness and selectivity of movento on bemisia tabaci and its parasitoid eretmocerus mundus. | the bemisia tabaci gennadius (homoptera:aleyrodidae) biotype complex is a key pest of several worldwide crops. the management and control of this pest has become difficult mainly due to its high reproductive rate and capacity to develop resistance to broad spectrum insecticides. in argentina b. tabaci whitefly, causes economic losses in most areas of agricultural production. eretmocerus mundus mercet (hymenoptera:aphelinidae) is the most important parasitoid of b. tabaci and is commercialized as ... | 2012 | 23885443 |
| rapid cold hardening and expression of heat shock protein genes in the b-biotype bemisia tabaci. | this paper describes the rapid cold hardening processes of the sweetpotato whitefly, bemisia tabaci (gennadius). it was found that all developmental stages of b. tabaci have the capacity of rapid cold hardening and the length of time required to induce maximal cold hardiness at 0 °c varies with stage. there was only 18.3% survival when adult whiteflies were transferred directly from 26 °c to -8.5 °c for 2 h. however, exposure to 0 °c for 1 h before transfer to -8.5 °c increased the survival to 8 ... | 2011 | 22182622 |
| genetic networking of the bemisia tabaci cryptic species complex reveals pattern of biological invasions. | a challenge within the context of cryptic species is the delimitation of individual species within the complex. statistical parsimony network analytics offers the opportunity to explore limits in situations where there are insufficient species-specific morphological characters to separate taxa. the results also enable us to explore the spread in taxa that have invaded globally. | 2011 | 21998669 |
| mtdna variability in whitefly (bemisia tabaci) populations in brazil. | bemisia tabaci (hemiptera: aleyrodidae) consists of a complex of morphologically indistinct biotypes that vary mainly in their capacity to transmit plant viruses and to induce physiological disorders in plants of economic importance. the adaptability of b. tabaci to many regions of the world has fostered the appearance of various biotypes and has resulted in a broad spectrum of host plants. our goal was to identify which biotypes were present in four b. tabaci populations in brazil. we quantifie ... | 2011 | 21968683 |
| characterization of cucumber vein-clearing virus, a whitefly (bemisia tabaci g.)-transmitted carlavirus. | | 2011 | 21956832 |
| silicon influence on resistance induction against bemisia tabaci biotype b (genn.) (hemiptera: aleyrodidae) and on vegetative development in two soybean cultivars. | the potential of populations of bemisia tabaci (genn.) to become resistant to insecticides has stimulated research into alternative tactics of integrated pest management such as the induction of host-plant resistance. recent data have shown that silicon can increase the degree of resistance of host plants to insect pests. therefore the aim of our work was to study the effects of silicon application on the vegetative development of soybean plants and on the induction of resistance to the silverle ... | 2013 | 21952968 |
| transcriptome analysis and comparison reveal divergence between two invasive whitefly cryptic species. | invasive species are valuable model systems for examining the evolutionary processes and molecular mechanisms associated with their specific characteristics by comparison with closely related species. over the past 20 years, two species of the whitefly bemisia tabaci species complex, middle east-asia minor 1 (meam1) and mediterranean (med), have both spread from their origin middle east/mediterranean to many countries despite their apparent differences in many life history parameters. previously ... | 2011 | 21939539 |
| chemical composition and insecticidal activity of essential oils of two aromatic plants from ivory coast against bemisia tabaci g. (hemiptera: aleyrodidae). | essential oils of aromatic plants with insecticidal properties are nowadays considered as alternative insecticides to protect cultures from attack by insect pest. the aims of the present work were to evaluate the toxicity of the essential oils vapors of two aromatic plants (lippia multiflora mold. and aframomum latifolium k. schum) against bemisia tabaci and to characterize their chemical composition. the highest fumigant toxicity against b. tabaci adults was observed with the l. multiflora oil: ... | 2011 | 21922931 |
| further spread of and domination by bemisia tabaci (hemiptera: aleyrodidae) biotype q on field crops in china. | the sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), causes severe crop losses to many crops. the worst of these losses are often associated with the invasion and establishment of biotypes b and q of this pest. previous research in 2007 showed that biotype q occurred with other biotypes in most field populations in china. to determine the current status of the biotype composition in the field, an extensive survey covering mainly eastern parts of china was conducted in 2 ... | 2011 | 21735919 |
| sublethal effects of imidacloprid on bemisia tabaci (hemiptera: aleyrodidae) under laboratory conditions. | the sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), is one of the most important pests in tropical and subtropical agriculture and is a key pest in greenhouse production worldwide. current management of b. tabaci relies upon frequent applications of insecticides. insecticide use not only directly affects pest populations through acute toxicity but also has indirect (sublethal) effects on pest physiology or behavior. in this study, we described sublethal effects of imid ... | 2011 | 21735901 |
| baseline susceptibilities of b- and q-biotype bemisia tabaci to anthranilic diamides in arizona. | development of pyriproxyfen and neonicotinoid resistance in the b-biotype whitefly and recent introduction of the q biotype have the potential to threaten current whitefly management programs in arizona. the possibility of integrating the novel anthranilic diamides chlorantraniliprole and cyantraniliprole into the current program to tackle these threats largely depends on whether these compounds have cross-resistance with pyriproxyfen and neonicotinoids in whiteflies. to address this question, t ... | 2012 | 21714059 |
| development of a low-density dna microarray for diagnosis of target-site mutations of pyrethroid and organophosphate resistance mutations in the whitefly bemisia tabaci. | rapid and accurate detection of mutations related to insecticide resistance is essential for development of resistance management strategies to support sustainable agriculture. the m918v, l925i and t929v mutations of the voltage-gated sodium channel gene (vgsc) and the f392w mutation of the acetylcholinesterase i gene (ace1) are reportedly associated with resistance to pyrethroids and organophosphates, respectively, in bemisia tabaci. in order to detect known base substitutions in the ace1 and v ... | 2011 | 21710552 |