| the non-canonical tomato yellow leaf curl virus recombinant that displaced its parental viruses in southern morocco exhibits a high selective advantage in experimental conditions. | recombination events are frequently inferred from the increasing number of sequenced viral genomes, but their impact on natural viral populations has rarely been evidenced. tylcv-is76 is a recombinant (begomovirus,geminiviridae) between the israel strain of tomato yellow leaf curl virus (tylcv-il) and the spanish strain of tomato yellow leaf curl sardinia virus (tylcsv-es) that was generated most probably in the late 1990s in southern morocco (souss). its emergence in the 2000s coincided with th ... | 2016 | 27902403 |
| real-time pcr protocols for the quantification of the begomovirus tomato yellow leaf curl sardinia virus in tomato plants and in its insect vector. | tomato yellow leaf curl sardinia virus (tylcsv) (geminiviridae) is an important pathogen, transmitted by the whitefly bemisia tabaci, that severely affects the tomato production in the mediterranean basin. here, we describe real-time pcr protocols suitable for relative and absolute quantification of tylcsv in tomato plants and in whitefly extracts. using primers and probe specifically designed for tylcsv, the protocols for relative quantification allow to compare the amount of tylcsv present in ... | 2015 | 25287496 |
| the involvement of heat shock proteins in the establishment of tomato yellow leaf curl virus infection. | tomato yellow leaf curl virus (tylcv), a begomovirus, induces protein aggregation in infected tomatoes and in its whitefly vector bemisia tabaci. the interactions between tylcv and hsp70 and hsp90 in plants and vectors are necessity for virus infection to proceed. in infected host cells, hsp70 and hsp90 are redistributed from a soluble to an aggregated state. these aggregates contain, together with viral dna/proteins and virions, hsps and components of the protein quality control system such as ... | 2017 | 28360921 |
| flupyradifurone effectively manages whitefly bemisia tabaci med (hemiptera: aleyrodidae) and tomato yellow leaf curl virus (tylcv) in tomato. | the cotton whitefly bemisia tabaci (gennadius) is among the most important pests of numerous crops and a vector of >100 plant viruses, causing significant crop losses worldwide. managing the pest as well as inhibiting the transmission of major viruses such as tomato yellow leaf curl virus (tylcv) is of utmost importance for sustainable yields. the efficacy on both whiteflies and virus transmission of the novel systemic butenolide insecticide flupyradifurone, was investigated in this study. | 2017 | 28345196 |
| insecticidal effects on the spatial progression of tomato yellow leaf curl virus and movement of its whitefly vector in tomato. | commercial management of whitefly-transmitted tomato yellow leaf curl virus (tylcv) typically relies on insecticide control of whitefly vectors as a first line of defense. we quantified this effect in crop tunnel studies, with validation in a tomato field setting. tomato yellow leaf curl virus-infected and bemisia tabaci (gennadius)-infested source plants were planted at the beginning of tunneled rows to serve as inoculum source, so that movement of whiteflies and tylcv symptoms could be tracked ... | 2017 | 28334339 |
| clathrin-mediated endocytosis is involved in tomato yellow leaf curl virus transport across the midgut barrier of its whitefly vector. | tomato yellow leaf curl virus (tylcv) is a begomovirus transmitted by the whitefly bemisia tabaci. the circulative translocation of the virus in the insect is known in its broad line. however, transit of tylcv from the digestive tract into the haemolymph is poorly understood. we studied the involvement of clathrin in this process by disrupting the clathrin-mediated endocytosis and the endosome network using inhibitor feeding, antibody blocking and dsrna silencing. we monitored the quantities of ... | 2017 | 28056414 |
| a jasmonate-inducible defense trait transferred from wild into cultivated tomato establishes increased whitefly resistance and reduced viral disease incidence. | whiteflies damage tomatoes mostly via the viruses they transmit. cultivated tomatoes lack many of the resistances of their wild relatives. in order to increase protection to its major pest, the whitefly bemisia tabaci and its transmitted tomato yellow leaf curl virus (tylcv), we introgressed a trichome-based resistance trait from the wild tomato solanum pimpinellifolium into cultivated tomato, solanum lycopersicum. the tomato backcross line bc5s2 contains acylsucrose-producing type-iv trichomes, ... | 2016 | 27920785 |
| elevated o₃ and tylcv infection reduce the suitability of tomato as a host for the whitefly bemisia tabaci. | the effects of elevated atmospheric ozone (o₃) levels on herbivorous insects have been well studied, but little is known about the combined effects of elevated o₃ and virus infection on herbivorous insect performance. using open-top chambers in the field, we determined the effects of elevated o₃ and tomato yellow leaf curl virus (tylcv) infection on wild-type (wt) tomato and 35s tomato (jasmonic acid (ja) defense-enhanced genotype) in association with whitefly, bemisia tabaci gennadius biotype b ... | 2016 | 27916792 |
| the contrasting effects of elevated co2 on tylcv infection of tomato genotypes with and without the resistance gene, mi-1.2. | elevated atmospheric co2 typically enhances photosynthesis of c3 plants and alters primary and secondary metabolites in plant tissue. by modifying the defensive signaling pathways in host plants, elevated co2 could potentially affect the interactions between plants, viruses, and insects that vector viruses. r gene-mediated resistance in plants represents an efficient and highly specific defense against pathogens and herbivorous insects. the current study determined the effect of elevated co2 on ... | 2016 | 27881989 |
| the whitefly bemisia tabaci knottin-1 gene is implicated in regulating the quantity of tomato yellow leaf curl virus ingested and transmitted by the insect. | the whitefly bemisia tabaci is a major pest to agricultural crops. it transmits begomoviruses, such as tomato yellow leaf curl virus (tylcv), in a circular, persistent fashion. transcriptome analyses revealed that b. tabaci knottin genes were responsive to various stresses. upon ingestion of tomato begomoviruses, two of the four knottin genes were upregulated, knot-1 (with the highest expression) and knot-3. in this study, we examined the involvement of b. tabaci knottin genes in relation to tyl ... | 2016 | 27455309 |
| the salicylic acid-mediated release of plant volatiles affects the host choice of bemisia tabaci. | the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) causes serious crop losses worldwide by transmitting viruses. we have previously shown that salicylic acid (sa)-related plant defenses directly affect whiteflies. in this study, we applied exogenous sa to tomato plants in order to investigate the interaction between sa-induced plant volatiles and nonviruliferous b. tabaci b and q or b- and q-carrying tomato yellow leaf curl virus (tylcv). the results showed that exogenous sa caused ... | 2016 | 27376280 |
| the autophagy pathway participates in resistance to tomato yellow leaf curl virus infection in whiteflies. | macroautophagy/autophagy plays an important role against pathogen infection in mammals and plants. however, little has been known about the role of autophagy in the interactions of insect vectors with the plant viruses, which they transmit. begomoviruses are a group of single-stranded dna viruses and are exclusively transmitted by the whitefly bemisia tabaci in a circulative manner. in this study, we found that the infection of a begomovirus, tomato yellow leaf curl virus (tylcv) could activate ... | 2016 | 27310765 |
| tomato yellow leaf curl virus (tylcv-il): a seed-transmissible geminivirus in tomatoes. | tomato yellow leaf curl virus (tylcv) is one of the most well-known tomato-infecting begomoviruses and transmitted by bemisia tabaci. seed transmission has previously been reported for some rna viruses, but tylcv has not previously been described as a seed-borne virus. in 2013 and 2014, without whitefly-mediated transmission, tylcv was detected in young tomato plants germinated from fallen fruits produced from tylcv-infected tomato plants in the previous cultivation season. in addition, tylcv-is ... | 2016 | 26743765 |
| tomato yellow leaf curl virus confronts host degradation by sheltering in small/midsized protein aggregates. | tomato yellow leaf curl virus (tylcv) is a begomovirus transmitted by the whitefly bemisia tabaci to tomato and other crops. tylcv proteins are endangered by the host defenses. we have analyzed the capacity of the tomato plant and of the whitefly insect vector to degrade the six proteins encoded by the tylcv genome. tomato and whitefly demonstrated the highest proteolytic activity in the fractions containing soluble proteins, less-in large protein aggregates; a significant decrease of tylcv prot ... | 2016 | 26654789 |
| temporal effects of a begomovirus infection and host plant resistance on the preference and development of an insect vector, bemisia tabaci, and implications for epidemics. | persistent plant viruses, by altering phenotypic and physiological traits of their hosts, could modulate the host preference and fitness of hemipteran vectors. a majority of such modulations increase vector preference for virus-infected plants and improve vector fitness, ultimately favouring virus spread. nevertheless, it remains unclear how these virus-induced modulations on vectors vary temporally, and whether host resistance to the pathogen influences such effects. this study addressed the tw ... | 2015 | 26529402 |
| effectiveness of cyantraniliprole for managing bemisia tabaci (hemiptera: aleyrodidae) and interfering with transmission of tomato yellow leaf curl virus on tomato. | cyantraniliprole is the second xylem-systemic active ingredient in the new anthranilic diamide class. greenhouse (2006), growth chamber (2007), and field studies (2009-2010) were conducted to determine the efficacy of cyantraniliprole for managing bemisia tabaci (gennadius) biotype b and in interfering with transmission of tomato yellow leaf curl virus (tylcv) by this whitefly. cyantraniliprole applied as soil treatments (200 sc) or foliar sprays (100 od) provided excellent adult whitefly contro ... | 2015 | 26470209 |
| manipulation of host quality and defense by a plant virus improves performance of whitefly vectors. | pathogen-mediated interactions between insect vectors and their host plants can affect herbivore fitness and the epidemiology of plant diseases. while the role of plant quality and defense in mediating these tripartite interactions has been recognized, there are many ecologically and economically important cases where the nature of the interaction has yet to be characterized. the bemisia tabaci (gennadius) cryptic species mediterranean (med) is an important vector of tomato yellow leaf curl viru ... | 2015 | 26470098 |
| tomato yellow leaf curl virus differentially influences plant defence responses to a vector and a non-vector herbivore. | plants frequently engage in simultaneous interactions with diverse classes of biotic antagonists. differential induction of plant defence pathways by these antagonists, and interactions between pathways, can have important ecological implications; however, these effects are currently not well understood. we explored how tomato yellow leaf curl virus (tylcv) influenced the performance of its vector (bemisia tabaci) and a non-vector herbivore (tetranychus urticae) occurring separately or together ... | 2016 | 26436779 |
| evaluating weeds as hosts of tomato yellow leaf curl virus. | bemisia tabaci (gennadius) biotype b transmits tomato yellow leaf curl virus (tylcv), which affects tomato production globally. prompt destruction of virus reservoirs is a key component of virus management. identification of weed hosts of tylcv will be useful for reducing such reservoirs. the status of weeds as alternate hosts of tylcv in florida remains unclear. in greenhouse studies, b. tabaci adults from a colony reared on tylcv-infected tomato were established in cages containing one of four ... | 2015 | 26314055 |
| replication of tomato yellow leaf curl virus in its whitefly vector, bemisia tabaci. | tomato yellow leaf curl virus (tylcv) is a begomovirus transmitted exclusively by the whitefly bemisia tabaci in a persistent, circulative manner. replication of tylcv in its vector remains controversial, and thus far, the virus has been considered to be nonpropagative. following 8 h of acquisition on tylcv-infected tomato plants or purified virions and then transfer to non-tylcv-host cotton plants, the amounts of virus inside whitefly adults significantly increased (>2-fold) during the first fe ... | 2015 | 26178995 |
| transmission of tomato yellow leaf curl virus by bemisia tabaci as affected by whitefly sex and biotype. | bemisia tabaci is a serious pest of vegetables and other crops worldwide. the most damaging and predominant b. tabaci biotypes are b and q, and both are vectors of tomato yellow leaf curl virus (tylcv). previous research has shown that q outperforms b in many respects but comparative research is lacking on the ability of b and q to transmit viruses. in the present study, we tested the hypothesis that b and q differ in their ability to transmit tylcv and that this difference helps explain tylcv o ... | 2015 | 26021483 |
| recessive resistance derived from tomato cv. tyking-limits drastically the spread of tomato yellow leaf curl virus. | the tomato yellow leaf curl disease (tylcd) causes severe damage to tomato (solanum lycopersicum l.) crops throughout tropical and subtropical regions of the world. tylcd is associated with a complex of single-stranded circular dna plant viruses of the genus begomovirus (family geminiviridae) transmitted by the whitefy bemisia tabaci gennadius (hemiptera: aleyrodidae). the tomato inbred line tx 468-rg is a source of monogenic recessive resistance to begomoviruses derived from the hybrid cv. tyki ... | 2015 | 26008699 |
| new insecticides for management of tomato yellow leaf curl, a virus vectored by the silverleaf whitefly, bemisia tabaci. | greenhouse studies using a randomized complete block design were carried out to evaluate the effect of six insecticides on transmission of tomato yellow leaf curl virus (tylcv) by the silverleaf whitefly, bemisia tabaci biotype b gennadius (hemiptera: aleyrodidae) to tomato, lycopersicon esculentum (miller) (solanales: solanaceae), seedlings that were inoculated with whiteflies from a tylcv colony in cages 3, 7, or 14 d after treatment with insecticide. the purpose was to reveal differences in r ... | 2014 | 25368089 |
| effects of plant virus and its insect vector on encarsia formosa, a biocontrol agent of whiteflies. | in this study, we investigated the tritrophic interactions among a persistently transmitted plant virus, tomato yellow leaf curl virus (tylcv), its insect vector, the sweetpotato whitefly bemisia tabaci, and a parasitoid, encarsia formosa gahan, one of the most extensively used biological control agents. as an emerging invasive pest worldwide, the two most damaging whiteflies are b. tabaci b and q cryptic species. on healthy tomato plants, parasitoid-induced mortality was significantly higher in ... | 2014 | 25096549 |
| tomato yellow leaf curl virus benefits population growth of the q biotype of bemisia tabaci (gennadius) (hemiptera: aleyrodidae). | plant viruses can directly influence their insect vectors, and indirectly through their shared host plant, altering their behavior and performance in a mutualistic or rather antagonistic manner. one of the most studied begomovirus, tomato yellow leaf curl virus (tylcv), may also facilitate the expansion of its vector, the whitefly bemisia tabaci (gennadius). considering the likely expansion of the disease and its major vector, we studied the direct and the indirect effects of a mediterranean iso ... | 2014 | 27193818 |
| three-way interactions between the tomato plant, tomato yellow leaf curl virus, and bemisia tabaci (hemiptera: aleyrodidae) facilitate virus spread. | plant defense responses can greatly affect plant viruses and their herbivore vectors. the current article reports on plant defense responses involving jasmonic acid (ja), salicylic acid (sa), and proteinase inhibitor (pi) in the three-way interaction between tomato plants, tomato yellow leaf curl virus, and the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae). the results showed that feeding by viruliferous b. tabaci increases the longevity and fecundity of nonviruliferous b. tabaci ... | 2014 | 25026648 |
| bemisia tabaci q carrying tomato yellow leaf curl virus strongly suppresses host plant defenses. | the concurrence of tomato yellow leaf curl virus (tylcv) with the spread of its vector bemisia tabaci q rather than b in china suggests a more mutualistic relationship between tylcv and q. here, we investigated the hypothesis that viruliferous b and q have different effects on plant defenses. we found the fecundity of nonviruliferous b, nonviruliferous q, viruliferous q and viruliferous b was 11.080, 12.060, 10.760, and 11.220 respectively on plants previously attacked by the other biotype, howe ... | 2014 | 24912756 |
| upregulation of probing- and feeding-related behavioural frequencies in bemisia tabaci upon acquisition of tomato yellow leaf curl virus. | the behaviour of insect vectors can be altered by the acquisition of plant viruses. bemisia tabaci, which is the vector of tomato yellow leaf curl virus (tylcv), causes damage to susceptible tomato cultivars. here, the frequencies of several behavioural characteristics related to probing and feeding that are exhibited by non-viruliferous (nv) and tylcv-viruliferous (v) adult b. tabaci were compared using a sandwich-type parafilm cage. | 2014 | 24831051 |
| rapid spread of a recently introduced virus (tomato yellow leaf curl virus) and its vector bemisia tabaci (hemiptera: aleyrodidae) in liaoning province, china. | in liaoning province, china, tomato yellow leaf curl virus (tylcv) was first detected in 2009 and in only four counties. to quantify the spread of tylcv and to identify potential factors influencing its spread in liaoning province, we assayed for tylcv within 1,055 whiteflies (bemisia tabaci (gennadius) complex) from 74 populations and 29 counties in 2011. the b. tabaci species of these individuals was determined based on molecular markers. tylcv was found in 13 counties (donggang, liaoyang, kaz ... | 2014 | 24665690 |
| a review of the mechanisms and components that determine the transmission efficiency of tomato yellow leaf curl virus (geminiviridae; begomovirus) by its whitefly vector. | begomoviruses are a group of icosahedral single stranded dna viruses exclusively transmitted by the sweet potato whitefly bemisia tabaci in a persistent, circulative manner. in this mode of transmission, begomoviruses are acquired by their insect vector as intact virions from the plant phloem, move along the food canal, foregut and esophagus and reach the midgut where they are absorbed into the hemolymph via the filter chamber. the filter chamber is the site where most of the ingested food is fi ... | 2014 | 24508344 |
| expression and functional characterisation of a soluble form of tomato yellow leaf curl virus coat protein. | tomato yellow leaf curl virus (tylcv), a member of the genus begomovirus within the family geminiviridae, is an important pathogen of tomato in many tropical, subtropical and temperate regions. tylcv is exclusively transmitted by the whitefly bemisia tabaci in a circulative manner. the viral coat protein (cp) has been assumed to play important roles in the entry of tylcv into the insect midgut cells. | 2014 | 24488592 |
| degradation mechanisms of the tomato yellow leaf curl virus coat protein following inoculation of tomato plants by the whitefly bemisia tabaci. | tomato yellow leaf curl virus (tylcv) is a begomovirus infecting tomato cultures worldwide. tylcv is transmitted to plants by the whitefly bemisia tabaci. once in the plant, the virus is subjected to attack by the host-plant defences, which may include sequestration in aggregates, proteolysis, ubiquitination, 26s proteasome degradation and autophagy. elucidating how the virus avoids destruction will make it possible to understand infection and possibly devise countermeasures. | 2014 | 24464776 |
| a bead-based suspension array for the multiplexed detection of begomoviruses and their whitefly vectors. | bead-based suspension array systems enable simultaneous fluorescence-based identification of multiple nucleic acid targets in a single reaction. this study describes the development of a novel approach to plant virus and vector diagnostics, a multiplexed 7-plex array that comprises a hierarchical set of assays for the simultaneous detection of begomoviruses and bemisia tabaci, from both plant and whitefly samples. the multiplexed array incorporates genus, species and strain-specific assays, offe ... | 2014 | 24388931 |
| lamium amplexicaule (lamiaceae): a weed reservoir for tomato yellow leaf curl virus (tylcv) in korea. | after the first identification of tomato yellow leaf curl virus (tylcv) in the southern part of korea in 2008, tylcv has rapidly spread to tomato farms in most regions of korea. from 2008 to 2010, a survey of natural weed hosts that could be reservoirs of tylcv was performed in major tomato production areas of korea. about 530 samples were collected and identified as belonging to 25 species from 11 families. pcr and southern hybridization were used to detect tylcv in samples, and replicating for ... | 2014 | 24327090 |
| facultative symbiont hamiltonella confers benefits to bemisia tabaci (hemiptera: aleyrodidae), an invasive agricultural pest worldwide. | bacterial symbionts infect most insect species, including important pests such as whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), and often exert important effects on host ecology. the facultative symbiont hamiltonella is found at high frequencies in the b. tabaci med (type: mediterranean-med) in china. the prevalence of this symbiont in natural populations suggests beneficial effects of infection or manipulation of host reproduction. to date, however, no empirical studies on the ... | 2013 | 24280594 |
| tomato yellow leaf curl virus alters the host preferences of its vector bemisia tabaci. | bemisia tabaci, the whitefly vector of tomato yellow leaf curl virus (tylcv), seriously reduces tomato production and quality. here, we report the first evidence that infection by tylcv alters the host preferences of invasive b. tabaci b (middle east-minor asia 1) and q (mediterranean genetic group), in which tylcv-free b. tabaci q preferred to settle on tylcv-infected tomato plants over healthy ones. tylcv-free b. tabaci b, however, preferred healthy tomato plants to tylcv-infected plants. in c ... | 2013 | 24096821 |
| recruitment of the host plant heat shock protein 70 by tomato yellow leaf curl virus coat protein is required for virus infection. | a functional capsid protein (cp) is essential for host plant infection and insect transmission of tomato yellow leaf curl virus (tylcv) and other monopartite begomoviruses. we have previously shown that tylcv cp specifically interacts with the heat shock protein 70 (hsp70) of the virus insect vector, bemisia tabaci. here we demonstrate that during the development of tomato plant infection with tylcv, a significant amount of hsp70 shifts from a soluble form into insoluble aggregates. cp and hsp70 ... | 2013 | 23894631 |
| virus infection of a weed increases vector attraction to and vector fitness on the weed. | weeds are important in the ecology of field crops, and when crops are harvested, weeds often become the main hosts for plant viruses and their insect vectors. few studies, however, have examined the relationships between plant viruses, vectors, and weeds. here, we investigated how infection of the weed datura stramonium l. by tomato yellow leaf curl virus (tylcv) affects the host preference and performance of the tylcv vector, bemisia tabaci (gennadius) q. the results of a choice experiment indi ... | 2013 | 23872717 |
| differential effects of an exotic plant virus on its two closely related vectors. | concurrent spread of tomato yellow leaf curl virus (tylcv) with invasion of bemisia tabaci q rather than b in china suggests a more mutualistic relationship between tylcv and q than b. to assess this hypothesis, we quantified the impacts of tylcv on the performance and competitiveness of b and q in the laboratory. the results showed that relative to their non-infected counterparts feeding on cotton (a non-host for tylcv), infected b exhibited significant reductions in life-history traits, wherea ... | 2013 | 23864010 |
| eugenol enhances the resistance of tomato against tomato yellow leaf curl virus. | tomato yellow leaf curl virus disease (tylcvd) causes severe to economic losses in tomato crops in china. the control of tylcvd is based primarily on the use of synthetic insecticide to control its vector whitefly (bemisia tabaci). to look for an alternative method for disease control, we investigated the effect of eugenol on controlling tylcvd. the potential of eugenol to trigger systemic acquired resistance (sar) in tomato (jiangsu 14) plants against tylcv was also investigated. | 2014 | 23852671 |
| highly sensitive serological methods for detecting tomato yellow leaf curl virus in tomato plants and whiteflies. | tomato yellow leaf curl virus (tylcv) is a member of the genus begomovirus in the family geminiviridae, which causes severe losses in tomato production in tropic and subtropic regions. | 2013 | 23647724 |
| within-host dynamics of the emergence of tomato yellow leaf curl virus recombinants. | tomato yellow leaf curl virus (tylcv) is a highly damaging begomovirus native to the middle east. tylcv has recently spread worldwide, recombining with other begomoviruses. recent analysis of mixed infections between tylcv and tomato leaf curl comoros begomovirus (tolckmv) has shown that, although natural selection preserves certain co-evolved intra-genomic interactions, numerous and diverse recombinants are produced at 120 days post-inoculation (dpi), and recombinant populations from different ... | 2013 | 23472190 |
| insect symbiont facilitates vector acquisition, retention, and transmission of plant virus. | tomato yellow leaf curl virus (tylcv) was first detected in china in 2006, following the introduction of bemisia tabaci q into china in 2003. since then, the incidence of tylcv in tomato fields in china has greatly increased as has the abundance and distribution of q whiteflies containing the bacterial symbiont hamiltonella with high frequency. this suggested that the symbiont hamiltonella might associate with the transmission efficiency of tylcv by the whitefly vector. here we report the first ... | 2013 | 23455639 |
| multiple forms of vector manipulation by a plant-infecting virus: bemisia tabaci and tomato yellow leaf curl virus. | for many insect-vectored plant viruses, the relationship between feeding behavior and vector competence may prove integral to an understanding of the epidemiology of the resulting plant disease. while plant-infecting viruses are well known to change host plant physiology in a way that makes them more attractive to vectors, viral manipulation of the vectors themselves has only recently been reported. previous research suggested that the rapid spread of tomato yellow leaf curl virus (tylcv) throug ... | 2013 | 23408638 |
| biological invasions of geminiviruses: case study of tylcv and bemisia tabaci in reunion island. | in the last 20 years, molecular ecology approaches have proven to be extremely useful to identify and assess factors associated with viral emerging diseases, particularly in economically and socially important tropical crops such as maize (maize streak disease) and cassava (cassava mosaic disease). molecular ecology approaches were applied in reunion island to analyze the epidemic of tomato yellow leaf curl disease, which has been affecting the island since the end of the 1990s. before the invas ... | 2012 | 23235470 |
| whitefly population dynamics and evaluation of whitefly-transmitted tomato yellow leaf curl virus (tylcv)-resistant tomato genotypes as whitefly and tylcv reservoirs. | sweetpotato whitefly, bemisia tabaci (gennadius), and whitefly-transmitted tomato yellow leaf curl virus (tylcv) are major threats to tomato production in the southeastern united states. tylcv was introduced to florida from the caribbean islands and has spread to other southern states of the united states. in georgia, in recent years, the incidence of tylcv has been steadily increasing. studies were conducted to monitor population dynamics of whiteflies in the vegetable production belt of georgi ... | 2012 | 22928328 |
| a developmentally regulated lipocalin-like gene is overexpressed in tomato yellow leaf curl virus-resistant tomato plants upon virus inoculation, and its silencing abolishes resistance. | to discover genes involved in tomato resistance to tomato yellow leaf curl virus (tylcv), we previously compared cdna libraries from susceptible (s) and resistant (r) tomato lines. among the genes preferentially expressed in r plants and upregulated by tylcv infection was a gene encoding a lipocalin-like protein. this gene was termed solanum lycopersicum virus resistant/susceptible lipocalin (slvrslip). the slvrslip structural gene sequence of r and s plants was identical. slvrslip was expressed ... | 2012 | 22843056 |
| upregulation of temperature susceptibility in bemisia tabaci upon acquisition of tomato yellow leaf curl virus (tylcv). | acquisition of plant viruses has various effects on physiological mechanisms in vector insects. bemisia tabaci is the only known vector of tomato yellow leaf curl virus (tylcv), which is a serious virus affecting tomato cultivars. in this study, the lifespan of q1 biotype was compared between non-viruliferous (nv) and tylcv-viruliferous (v) whiteflies. total lifespan from egg to adult death of nv whiteflies was 62.54 days but 10.64 days shorter in v whiteflies. we investigated the temperature su ... | 2012 | 22841829 |
| rapid spread of tomato yellow leaf curl virus in china is aided differentially by two invasive whiteflies. | tomato yellow leaf curl virus (tylcv) was introduced into china in 2006, approximately 10 years after the introduction of an invasive whitefly, bemisia tabaci (genn.) b biotype. even so the distribution and prevalence of tylcv remained limited, and the economic damage was minimal. following the introduction of q biotype into china in 2003, the prevalence and spread of tylcv started to accelerate. this has lead to the hypothesis that the two biotypes might not be equally competent vectors of tylc ... | 2012 | 22514670 |
| acylsucrose-producing tomato plants forces bemisia tabaci to shift its preferred settling and feeding site. | the whitefly bemisia tabaci (genn.) causes dramatic damage to plants by transmitting yield-limiting virus diseases. previous studies proved that the tomato breeding line abl 14-8 was resistant to b. tabaci, the vector of tomato yellow leaf curl disease (tylcd). this resistance is based on the presence of type iv glandular trichomes and acylsucrose production. these trichomes deter settling and probing of b. tabaci in abl 14-8, which reduces primary and secondary spread of tylcd. | 2012 | 22427950 |
| mapping and introgression of a tomato yellow leaf curl virus tolerance gene, ty-1. | the whitefly-transmitted tomato yellow-leaf curl gemini-virus (tylcv) is a major pathogen of tomatoes. the wild tomato species lycopersicon chilense, which is resistant to the virus, was crossed to the cultivated tomato, l. esculentum. the backcross-1 selfed (bc1s1) generation was inoculated and a symptomless plant was selected. this plant was analyzed using 61 molecular markers, which span the tomato genome, to determine which l. chilense chromosome segments were introgressed. a bc2s1 populatio ... | 1994 | 24185918 |
| rapid assessment of insect fauna based on local knowledge: comparing ecological and ethnobiological methods. | the rapid assessment of biodiversity making use of surveys of local knowledge has been successful for different biological taxa. however, there are no reports on the testing of such tools for sampling insect fauna. the present study aimed to evaluate the efficiency of different ethnobiological techniques for rapid sampling of insect fauna. | 2016 | 26932264 |
| densities of eggs and nymphs and percent parasitism of bemisia tabaci (hemiptera: aleyrodidae) on common weeds in west central florida. | the density of eggs and nymphs of bemisia tabaci (gennadius) biotype b and the percent parasitism of the nymphs were measured from specimens collected on nine species of weeds, commonly found in west central florida during the spring and summer of 2012 and 2013. the weeds were direct seeded in 2012 and grown as transplants in 2013 for randomized complete block design experiments. the leaf area of each whole-plant sample was measured and the b. tabaci density parameters were converted to numbers ... | 2014 | 26462945 |
| aqueous extracts of some medicinal plants are as toxic as imidacloprid to the sweet potato whitefly, bemisia tabaci. | aqueous extracts of nine plants, known to have medicinal activity, were tested for their toxicity against the sweet potato whitefly, bemisia tabaci genn. (homoptera: aleurodidae) compared to the toxicity of the insecticide, imidacloprid. extracts of lepidiuim sativum l. (brassicales: brassicaceae) killed 71 % of early stage nymphs, which was not significantly different from mortality caused by imidacloprid. treatment of pupae with three plant extracts, l. sativum, achillea biebersteinii l. (aste ... | 2009 | 19613450 |
| evolutionary conservation of candidate osmoregulation genes in plant phloem sap-feeding insects. | the high osmotic pressure generated by sugars in plant phloem sap is reduced in phloem-feeding aphids by sugar transformations and facilitated water flux in the gut. the genes mediating these osmoregulatory functions have been identified and validated empirically in the pea aphid acyrthosiphon pisum: sucrase 1 (suc1), a sucrase in glycoside hydrolase family 13 (gh13), and aquaporin 1 (aqp1), a member of the drosophila integral protein (drip) family of aquaporins. here, we describe molecular anal ... | 2016 | 26896054 |
| two host clades, two bacterial arsenals: evolution through gene losses in facultative endosymbionts. | bacterial endosymbiosis is an important evolutionary process in insects, which can harbor both obligate and facultative symbionts. the evolution of these symbionts is driven by evolutionary convergence, and they exhibit among the tiniest genomes in prokaryotes. the large host spectrum of facultative symbionts and the high diversity of strategies they use to infect new hosts probably impact the evolution of their genome and explain why they undergo less severe genomic erosion than obligate symbio ... | 2015 | 25714744 |
| the bacterial communities in plant phloem-sap-feeding insects. | the resident microbiota of animals represents an important contribution to the global microbial diversity, but it is poorly known in many animals. this study investigated the bacterial diversity in plant phloem-sap-feeding whiteflies, aphids and psyllids by pyrosequencing bacterial 16s rrna gene amplicons. after correction for sequencing error, just 3-7 bacterial operational taxonomic units were recovered from each insect sample sequenced to sufficient depth for saturation of rarefaction curves. ... | 2014 | 24350573 |
| an aphid-borne bacterium allied to the secondary symbionts of whitefly. | bacterial 16s rdna amplified by pcr from the pea aphid acyrthosiphon pisum included a sequence with >98% similarity to secondary symbionts in the whitefly bemisia tabaci. the 'pea aphid bemisia-like bacterium' (pabs) and b. tabaci secondary symbionts are estimated to have diverged 17-34 million years ago, a time considerably more recent than the common ancestor of aphids and whitefly and suggestive of horizontal transmission of this bacterial lineage. pabs was scored in both the gut and ovaries ... | 2001 | 11377772 |
| molecular mechanisms associated with increased tolerance to the neonicotinoid insecticide imidacloprid in the dengue vector aedes aegypti. | mosquitoes are vectors of several major human diseases and their control is mainly based on the use of chemical insecticides. resistance of mosquitoes to organochlorines, organophosphates, carbamates and pyrethroids led to a regain of interest for the use of neonicotinoid insecticides in vector control. the present study investigated the molecular basis of neonicotinoid resistance in the mosquito aedes aegypti. a strain susceptible to insecticides was selected at the larval stage with imidaclopr ... | 2013 | 23058251 |
| emamectin, a novel insecticide for controlling field crop pests. | emamectin is a macrocyclic lactone insecticide with low toxicity to non-target organisms and the environment, and is considered an important component in pest-management programmes for controlling field crop pests. it is a powerful compound for controlling the cotton bollworm helicoverpa armigera (hübner). a spray concentration of 25 mg ai litre-1 in a cotton field resulted in over 90% suppression of h armigera larvae up to day 28 after treatment, while similar mortality of the egyptian cotton l ... | 2002 | 12449526 |
| entomopathogenic potential of verticillium and acremonium species (deuteromycotina: hyphomycetes). | hyphomycetes with conidia formed in slimy heads from hyaline mycelium were isolated from a range of insect hosts. isolation on artificial medium and microscopic examination revealed that these fungi in many cases were not verticillium lecanii despite a superficial resemblance to this common entomopathogen. the fungi were identified as verticillium fusisporum, verticillium psalliotae, verticillium lamellicola, and species of acremonium. isolates of these fungi were bioassayed against the sweet-po ... | 1999 | 10222186 |
| performance of bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) on weeds. | bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) is regarded as a pest with a large number of hosts, including crops and weeds. the performance of this whitefly on seven weeds was evaluated in order to identify the most suitable host. the following weeds that are very common in intense agricultural areas in the state of são paulo, brazil, were selected for this study: spurge (euphorbia heterophylla), beggarticks (bidens pilosa), red tasselflower (emilia sonchifolia), small-flower galins ... | 2014 | 27194066 |
| insecticide resistance in bemisia tabaci gennadius (homoptera: aleyrodidae) and anopheles gambiae giles (diptera: culicidae) could compromise the sustainability of malaria vector control strategies in west africa. | insecticides from the organophosphate (op) and pyrethroid (py) chemical families, have respectively, been in use for 50 and 30 years in west africa, mainly against agricultural pests, but also against vectors of human disease. the selection pressure, with practically the same molecules year after year (mainly on cotton), has caused insecticide resistance in pest populations such as bemisia tabaci, vector of harmful phytoviruses on vegetables. the evolution toward insecticide resistance in malari ... | 2013 | 23792227 |
| using drosophila melanogaster to validate metabolism-based insecticide resistance from insect pests. | identifying molecular mechanisms of insecticide resistance is important for preserving insecticide efficacy, developing new insecticides and implementing insect control. the metabolic detoxification of insecticides is a widespread resistance mechanism. enzymes with the potential to detoxify insecticides are commonly encoded by members of the large cytochrome p450, glutathione s-transferase and carboxylesterase gene families, all rapidly evolving in insects. here, we demonstrate that the model in ... | 2012 | 23023059 |
| how active ingredient localisation in plant tissues determines the targeted pest spectrum of different chemistries. | the efficacies of four commercial insecticides and of two research compounds were tested against aphids (aphis craccivora and myzus persicae), whiteflies (bemisia tabaci) and red-spotted spider mites (tetranychus urticae) in intrinsic (oral administration), curative (direct contact spray) and translaminar (arthropods infested on untreated leaf underside) assays. with a new translaminar model, the transport across the leaf cuticle and tissues and the electrochemical distribution of test compounds ... | 2016 | 26112169 |
| synthesis and biological activity of a new class of insecticides: the n-(5-aryl-1,3,4-thiadiazol-2-yl)amides. | optimization studies on a high-throughput screening (hts) hit led to the discovery of a series of n-(6-arylpyridazin-3-yl)amides with insecticidal activity. it was hypothesized that the isosteric replacement of the pyridazine ring with a 1,3,4-thiadiazole ring could lead to more potent biological activity and/or a broader sap-feeding pest spectrum. the resulting n-(5-aryl-1,3,4-thiadiazol-2-yl)amides were explored as a new class of insecticides. | 2017 | 27414747 |
| presence of native prey does not divert predation on exotic pests by harmonia axyridis in its indigenous range. | in china, two invasive pests, bemisia tabaci meam1 (gennadius) and frankliniella occidentalis (pergande), often co-occur with the native pest, aphis gossypii (glover), on plants of malvaceae and cucurbitaceae. all three are preyed on by the native ladybird, harmonia axyridis (pallas); however, the native predator might be expected to prefer native prey to the exotic ones due to a shared evolutionary past. in order to clarify whether the presence of native prey affected the consumption of these t ... | 2016 | 27391468 |
| effects of spirotetramat treatments on fecundity and carboxylesterase expression of aphis gossypii glover. | spirotetramat is a novel tetramic acid-based insecticide, belonging to keto-enol pesticide family, with a novel mode of action; it interferes with lipid biosynthesis. its insecticide activity against various agricultural pest insects have been demonstrated (e.g. on myzus persicae, bemisia tabaci and tetranychus urticae). however, information available is currently limited on the efficacy of spirotetramat on the cotton aphid, aphis gossypii, a key cotton pest worldwide. we assessed the spirotetra ... | 2016 | 26898726 |
| inhibition of α-glucosidase activity by n-deoxynojirimycin analogs in several insect phloem sap feeders. | secondary metabolites and synthetic iminosugars that structurally resemble monosaccharides are potent inhibitors of α-glucosidase activity. the enzyme is core in cleaving sucrose in phloem feeding insects and it also plays a crucial role of reducing osmotic stress via the formation of oligosaccharides. inhibition of hydrolysis by iminosugars should result in nutritional deficiencies and/or disruption of normal osmoregulation. deoxynojirimycin (dnj) and 2 n-alkylated analogs [n-butyl dnj (nb-dnj) ... | 2016 | 25900765 |
| synergistic manipulations of plant and insect defences. | it has been demonstrated previously that cis-jasmone acts as an elicitor of plant defence mechanism(s) by inducing secondary metabolism. it has also been demonstrated that temporal synergism can result in hypersensitive insect pests due to the inhibition of metabolic enzymes. | 2014 | 23653417 |
| formation of stylet sheaths in āere (in air) from eight species of phytophagous hemipterans from six families (suborders: auchenorrhyncha and sternorrhyncha). | stylet sheath formation is a common feature among phytophagous hemipterans. these sheaths are considered essential to promote a successful feeding event. stylet sheath compositions are largely unknown and their mode of solidification remains to be elucidated. this report demonstrates the formation and solidification of in āere (in air) produced stylet sheaths by six hemipteran families: diaphorina citri (psyllidae, asian citrus psyllid), aphis nerii (aphididae, oleander/milkweed aphid), toxopter ... | 2013 | 23638086 |
| biological characterization of sulfoxaflor, a novel insecticide. | the commercialization of new insecticides is important for ensuring that multiple effective product choices are available. in particular, new insecticides that exhibit high potency and lack insecticidal cross-resistance are particularly useful in insecticide resistance management (irm) programs. sulfoxaflor possesses these characteristics and is the first compound under development from the novel sulfoxamine class of insecticides. | 2011 | 21308958 |
| mapping and validation of qtls for resistance to aphids and whiteflies in melon. | aphis gossypii and bemisia tabaci are severe hemipteran pests of melon crops and breeding for resistance to both insects is required to reduce pesticide use. resistance was evaluated for its effect on behaviour and biotic potential of both hemipterans in a population of recombinant inbred lines (rils) derived from the cross védrantais x pi 161375. insect variability was considered using two a. gossypii clones and two b. tabaci populations. two additive qtls affected the whiteflies. four additive ... | 2010 | 20180095 |
| hypersensitive response to aphis gossypii glover in melon genotypes carrying the vat gene. | aphis gossypii glover causes direct and indirect damage to cucumis melo l. crops. to decrease the harmful effects of this pest, one of the most economically and environmentally acceptable options is to use genetically resistant melon varieties. to date, several sources of resistance carrying the vat gene are used in melon breeding programmes that aim to prevent a. gossypii colonization and the subsequent aphid virus transmission. the results suggest that the resistance conferred by this gene is ... | 2009 | 19474089 |
| temporal synergism can enhance carbamate and neonicotinoid insecticidal activity against resistant crop pests. | piperonyl butoxide (pbo) effectively synergises synthetic pyrethroids, rendering even very resistant insect pests susceptible, provided a temporal element is included between exposure to synergist and insecticide. this concept is now applied to carbamates and neonicotinoids. | 2008 | 17926308 |
| temporal synergism by microencapsulation of piperonyl butoxide and alpha-cypermethrin overcomes insecticide resistance in crop pests. | a microencapsulated formulation that gives a burst release of piperonyl butoxide (pbo) several hours before a burst release of a conventional pyrethroid can effectively overcome metabolic resistance in bemisia tabaci gennadius, helicoverpa armigera (hübner), aphis gossypii glover and myzus persicae sulzer. this increase in efficacy against resistant pests was reflected in a field trial against b. tabaci on cotton, eliminating the need for two treatments. the ratio between the active insecticide ... | 2007 | 17304634 |
| impact of melon accessions resistant to aphids on the demographic potential of silverleaf whitefly. | bemisia tabaci (gennadius) and aphis gossypii glover are devastating melon, cucumis melo l., pests. the geographic areas where they occur overlap, and the same chemicals are used to control both of them. therefore, to reduce pesticide use, it would be necessary to breed melon lines that simultaneously express a resistance to both insects. female survival; the time when reproduction starts, peaks, and ends; the number of female offspring at the reproductive peak; and total reproduction (s) were d ... | 2005 | 15889749 |
| characterization of acetylcholinesterases, and their genes, from the hemipteran species myzus persicae (sulzer), aphis gossypii (glover), bemisia tabaci (gennadius) and trialeurodes vaporariorum (westwood). | gene sequences encoding putative acetylcholinesterases have been reported for four hemipteran insect species. although acetylcholinesterase insensitivity occurs in insecticide-resistant populations of each of these species, no mutations were detected in the gene sequences from the resistant insects. this, coupled with a series of experiments using novel reversible inhibitors to compare the biochemical characteristics of acetylcholinesterase from a range of insect species, showed that the cloned ... | 2003 | 14986922 |
| investigation on some biological aspects of chrysoperla lucasina (chrysopidae: neuroptera) on bemisia tabaci in laboratory conditions. | bemisia tabaci is one of the most important key pests of many types of cultivated plants. lacewings (chrysopidae: neuroptera) are predatory insects, widely used in biological control programs. between them green lacewing is a promising biological control agent of pests in green houses and crop fields. in this study, gravid females of the green lacewing chrysoperla lucasina (lacroix) were captured from sarepolzahab ( altitude 540m, latitude 34 degrees ,14' n 46 degrees, 9' e) in western part of i ... | 2012 | 23885430 |
| glucosinolate desulfation by the phloem-feeding insect bemisia tabaci. | glucosinolates are plant secondary defense metabolites confined nearly exclusively to the order brassicales. upon tissue rupture, glucosinolates are hydrolyzed to various bioactive breakdown products by the endogenous plant enzyme myrosinase. as the feeding of chewing insect herbivores is associated with plant tissue damage, these insects have developed several independent strategies for coping with the glucosinolate-myrosinase defense system. on the other hand, our knowledge of how phloem-feedi ... | 2016 | 26961756 |
| repellent and attractive effects of α-, β-, and dihydro-β- ionone to generalist and specialist herbivores. | in plants, the oxidative cleavage of carotenoid substrates produces volatile apocarotenoids, including α-ionone, β-ionone, and dihydro-β-ionone, compounds that are important in herbivore-plant communication. for example, β-ionone is part of an induced defense in canola, brassica napus, and is released following wounding by herbivores. the objectives of the research were to evaluate whether these volatile compounds would: 1) be released in higher quantities from plants through the over-expression ... | 2016 | 26852133 |
| systematic analysis of phloem-feeding insect-induced transcriptional reprogramming in arabidopsis highlights common features and reveals distinct responses to specialist and generalist insects. | phloem-feeding insects (pfis), of which aphids are the largest group, are major agricultural pests causing extensive damage to crop plants. in contrast to chewing insects, the nature of the plant response to pfis remains poorly characterized. scrutiny of the literature concerning transcriptional responses of model and crop plant species to pfis reveals surprisingly little consensus with respect to the transcripts showing altered abundance following infestation. nevertheless, core features of the ... | 2015 | 25540442 |
| arabidopsis thaliana plants with different levels of aliphatic- and indolyl-glucosinolates affect host selection and performance of bemisia tabaci. | generalist insects show reduced selectivity when subjected to similar, but not identical, host plant chemical signatures. here, we produced transgenic arabidopsis thaliana plants that over-express genes regulating the aliphatic- and indolyl- glucosinolates biosynthetic pathways with either a constitutive (camv 35s) or a phloem-specific promoter (atsuc2). this allowed us to examine how exposure to high levels of aliphatic- or indolyl-glucosinolates in homogenous habitats (leaf cage apparatus cont ... | 2013 | 24190022 |
| feeding by whiteflies suppresses downstream jasmonic acid signaling by eliciting salicylic acid signaling. | phloem-feeding whiteflies in the species complex bemisia tabaci cause extensive crop damage worldwide. one of the reasons for their "success" is their ability to suppress the effectual jasmonic acid (ja) defenses of the host plant. however, little is understood about the mechanisms underlying whitefly suppression of ja-regulated defenses. here, we showed that the expression of salicylic acid (sa)-responsive genes (eds1 and pr1) in arabidopsis thaliana was significantly enhanced during feeding by ... | 2013 | 23604702 |
| jasmonate and ethylene signaling mediate whitefly-induced interference with indirect plant defense in arabidopsis thaliana. | upon herbivore attack, plants activate an indirect defense, that is, the release of a complex mixture of volatiles that attract natural enemies of the herbivore. when plants are simultaneously exposed to two herbivore species belonging to different feeding guilds, one herbivore may interfere with the indirect plant defense induced by the other herbivore. however, little is understood about the mechanisms underlying such interference. here, we address the effect of herbivory by the phloem-feeding ... | 2013 | 23311965 |
| comparative transcriptome analysis of arabidopsis thaliana infested by diamond back moth (plutella xylostella) larvae reveals signatures of stress response, secondary metabolism, and signalling. | plants are exposed to attack from a large variety of herbivores. feeding insects can induce substantial changes of the host plant transcriptome. arabidopsis thaliana has been established as a relevant system for the discovery of genes associated with response to herbivory, including genes for specialized (i.e. secondary) metabolism as well as genes involved in plant-insect defence signalling. | 2008 | 18400103 |
| effect of plant development (age and size) on the mi-1-mediated resistance of tomato to whitefly bemisia tabaci. | whitefly, bemisia tabaci, is one of the most important pests of tomato, solanum lycopersicum l. the mi-1 gene mediates tomato resistance to the middle east-asia minor 1 (meam1) and mediterranean (med) species of b. tabaci, three species of root-knot nematodes, meloidogyne spp., and the potato aphid, macrosiphum euphorbiae. tomato seedlings bearing the mi-1 gene are resistant to nematodes soon after germination but resistance to aphids is developmentally regulated; a reliable conclusion about mi- ... | 2017 | 28397642 |
| gene-for-gene disease resistance: bridging insect pest and pathogen defense. | active plant defense, also known as gene-for-gene resistance, is triggered when a plant resistance (r) gene recognizes the intrusion of a specific insect pest or pathogen. activation of plant defense includes an array of physiological and transcriptional reprogramming. during the past decade, a large number of plant r genes that confer resistance to diverse group of pathogens have been cloned from a number of plant species. based on predicted protein structures, these genes are classified into a ... | 2004 | 15724964 |
| variation in tomato host response to bemisia tabaci (hemiptera: aleyrodidae) in relation to acyl sugar content and presence of the nematode and potato aphid resistance gene mi. | two commercial cultivars of tomato, alta and peto 95, the accession line number la716 of lycopersicon pennellii and lines 94gh-006 and 94gh-033 (backcrosses between peto 95 and la716), with different leaf acyl sugar contents were screened for resistance to bemisia argentifolii bellows & perring (corresponding to the spanish b-biotype of bemisia tabaci (gennadius)), in greenhouse- and field-no-choice experiments. there was no oviposition on la716 (with the highest acyl sugar content) while the gr ... | 2000 | 10948376 |
| vector and nonvector insect feeding reduces subsequent plant susceptibility to virus transmission. | the interactions of vector-virus-plant have important ecological and evolutionary implications. while the tripartite interactions have received some attention, little is known about whether vector infestation affects subsequent viral transmission and infection. working with the whitefly bemisia tabaci, begomovirus and tobacco/tomato, we demonstrate that pre-infestation of plants by the whitefly vector reduced subsequent plant susceptibility to viral transmission. pre-infestation by the cotton bo ... | 2017 | 28382644 |
| susceptibility of med-q1 and med-q3 biotypes of bemisia tabaci (hemiptera: aleyrodidae) populations to essential and seed oils. | bemisia tabaci (gennadius) (hemiptera: aleyrodidae) is a major pest of many agricultural and ornamental crops in tropical and subtropical regions causing damages that result in important economic losses. insecticides are commonly used in greenhouses or fields to control b. tabaci populations leading to rapid evolution of resistance that render treatments inefficient. therefore, and for environmental and human health concerns, other approaches must be developed for this pest management. in the pr ... | 2017 | 28369577 |
| new putative cryptic species detection and genetic network analysis of bemisia tabaci (hempitera: aleyrodidae) in china based on mitochondrial coi sequences. | the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) is a cryptic species complex and widely distributed throughout tropical and subtropical regions. to understand the b. tabaci cryptic species diversity in china more comprehensively, in the year 2014 and 2016, a large-scale sampling was conducted from the famous biodiversity hotspot of china, yunnan province. mitochondrial cytochrome oxidase i gene sequences were used to identify new putative cryptic species. phylogenetic analyses w ... | 2017 | 28366102 |
| cooperative metabolism in a three-partner insect-bacterial symbiosis revealed by metabolic modeling. | an important factor determining the impact of microbial symbionts on their animal host is the balance between the cost of nutrients consumed by the symbionts and benefit of nutrients released back to the host, but the quantitative significance of nutrient exchange in symbioses involving multiple microbial partners has rarely been addressed. in this study on the association between two intracellular bacterial symbionts, portiera aleyrodidarum and hamiltonella defensa, and their animal host, the w ... | 2017 | 28348026 |
| mini tomato genotypes resistant to the silverleaf whitefly and to two-spotted spider mites. | the mini tomato production has expanded, becoming an amazing alternative for enterprise. despite all commercial potential, the cultivation has the occurrence of pests as main obstacle during the crop development. nowadays, there are no researches that aimed obtaining genotypes with high acylsugar content, capable of providing a broad-spectrum resistance to pests. this study aimed the selection of mini tomato genotypes, with high acylsugar content, and checking the resistance level to the silverl ... | 2017 | 28340275 |
| field-evolved resistance of bemisia tabaci (hemiptera: aleyrodidae) to carbodiimide and neonicotinoids in pakistan. | the evolution of resistance to carbodiimide (a toxic metabolite of diafenthiuron) and four neonicotinoids imidacloprid, acetamiprid, thiamethoxam, and thiacloprid in the pakistani populations of sweetpotato whitefly (bemisia tabaci gennadius) was monitored from 1996 to 2015 using a leaf-dip bioassay. diafenthiuron, imidacloprid, and acetamiprid were introduced into pakistani agriculture in mid-1990s and heavily used since then, because b. tabaci resistance and consequently control failures to co ... | 2017 | 28334290 |
| resistance monitoring for eight insecticides on the sweetpotato whitefly (hemiptera: aleyrodidae) in china. | the sweetpotato whitefly, bemisia tabaci (gennadius), is an important pest of many crops worldwide. because control of b. tabaci still depends on the application of insecticides in china, monitoring the insecticide resistance of b. tabaci populations is essential for achieving control and for managing resistance. in this study, field populations of b. tabaci on vegetables were collected in three regions of china in 2011, 2012, and 2013. the resistance of these populations (all of which were dete ... | 2017 | 28334168 |
| genome sequencing of the sweetpotato whitefly bemsia tabaci med/q. | the sweetpotato whitefly bemisia tabaci is a highly destructive agricultural and ornamental crop pest. it damages host plants through both phloem feeding and vectoring plant pathogens. introductions of b. tabaci are difficult to quarantine and eradicate because of its high reproductive rates, broad host plant range, and insecticide resistance. | 2017 | 28327996 |
| selection and validation of reference genes for qrt-pcr analysis during biological invasions: the thermal adaptability of bemisia tabaci med. | the bemisia tabaci mediterranean (med) cryptic species has been rapidly invading to most parts of the world owing to its strong ecological adaptability, which is considered as a model insect for stress tolerance studies under rapidly changing environments. selection of a suitable reference gene for quantitative stress-responsive gene expression analysis based on qrt-pcr is critical for elaborating the molecular mechanisms of thermotolerance. to obtain accurate and reliable normalization data in ... | 2017 | 28323834 |
| phylogenetic relationships among whiteflies in the bemisia tabaci (gennadius) species complex from major cassava growing areas in kenya. | whiteflies, bemisia tabaci (gennadius) are major insect pests that affect many crops such as cassava, tomato, beans, cotton, cucurbits, potato, sweet potato, and ornamental crops. bemisia tabaci transmits viral diseases, namely cassava mosaic and cassava brown streak diseases, which are the main constraints to cassava production, causing huge losses to many small-scale farmers. the aim of this work was to determine the phylogenetic relationships among bemisia tabaci species in major cassava grow ... | 2017 | 28264479 |
| biochemical evaluation of interactions between synergistic molecules and phase i enzymes involved in insecticide resistance in b- and q-type bemisia tabaci (hemiptera: aleyrodidae). | metabolic resistance is an important consideration in the whitefly bemisia tabaci, where an esterase-based mechanism has been attributed to pyrethroid resistance and over-expression of the cytochrome p450, cyp6cm1, has been correlated to resistance to imidacloprid and other neonicotinoids. | 2017 | 28195678 |