Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| incidence and characterisation of resistance to neonicotinoid insecticides and pymetrozine in the greenhouse whitefly, trialeurodes vaporariorum westwood (hemiptera: aleyrodidae). | trialeurodes vaporariorum (westwood), also known as the greenhouse whitefly, is a serious pest of protected vegetable and ornamental crops in most temperate regions of the world. neonicotinoid insecticides are used widely to control this species, although resistance has been reported and may be becoming widespread. | 2010 | 20799247 |
| distribution and dynamics of bemisia tabaci invasive biotypes in central china. | the tobacco whitefly, bemisia tabaci (gennadius), causes severe crop losses in many agricultural systems. the worst of these losses are often associated with the invasion and establishment of specific whitefly biotypes. in a comprehensive survey of biotypes present in central china between 2005 and 2007, we obtained 191 samples of b. tabaci from 19 districts in hubei province and its surrounds. biotypes were identified by rapd-pcr and by sequencing the mitochondrial cytochrome oxidase i gene (mt ... | 2011 | 20822556 |
| biotype and insecticide resistance status of the whitefly bemisia tabaci from china. | resistance to numerous insecticide classes in bemisia tabaci gennadius has impaired field control efficacy in south-eastern china. the biotype and resistance status of b. tabaci collected from these areas was investigated. | 2010 | 20824685 |
| a mutation in the lettuce infectious yellows virus minor coat protein disrupts whitefly transmission but not in planta systemic movement. | the lettuce infectious yellows virus (liyv) rna 2 mutant p1-5b was previously isolated from bemisia tabaci-transmitted virus maintained in chenopodium murale plants. p1-5b rna 2 contains a single-nucleotide deletion in the minor coat protein (cpm) open reading frame (orf) that is predicted to result in a frameshift and premature termination of the protein. using the recently developed agroinoculation system for liyv, we tested rna 2 containing the p1-5b cpm mutant genotype (agro-pr6-5b) in nicot ... | 2010 | 20861267 |
| biological parameters of bemisia tabaci (gennadius) biotype b (hemiptera: aleyrodidae) on jatropha gossypiifolia, commercial (manihot esculenta) and wild cassava (manihot flabellifolia and m. carthaginensis) (euphorbiaceae). | bemisia tabaci (gennadius) is one of the most important pests of cassava in africa and several countries of asia due to the damage caused by direct feeding, the excretion of honeydew, and its capacity as a vector of cassava mosaic geminivirus. there is a general consensus that b. tabaci is a complex of morphologically indistinguishable populations with different biotypes. in the americas, the polyphagous biotype b does not appear to feed on cassava. recent studies indicate that it is possible, h ... | 2010 | 20877992 |
| diet selection exhibited by juvenile and adult lifestages of the omnivores western tarnished plant bug, lygus hesperus and tarnished plant bug, lygus lineolaris. | lygus hesperus knight and lygus lineolaris (palisot de beauvois) (heteroptera: miridae) are economically important plant bugs on many crops worldwide. however, these omnivores are also facultative predators on a wide variety of insects. this study was conducted to quantify and compare herbivory and carnivory exhibited among different lifestages of these two insect pests. the feeding activity of a total of 422 individuals was observed for 1 h each in feeding arenas containing a cotton leaf disk a ... | 2010 | 20879921 |
| tomato pathogenesis-related protein genes are expressed in response to trialeurodes vaporariorum and bemisia tabaci biotype b feeding. | the temporal and spatial expression of tomato wound- and defense-response genes to bemisia tabaci biotype b (the silverleaf whitefly) and trialeurodes vaporariorum (the greenhouse whitefly) feeding were characterized. both species of whiteflies evoked similar changes in tomato gene expression. the levels of rnas for the methyl jasmonic acid (meja)- or ethylene-regulated genes that encode the basic β-1,3-glucanase (glub), basic chitinase (chi9), and pathogenesis-related protein-1 (pr-1) were moni ... | 2010 | 20927641 |
| flufenerim, a novel insecticide acting on diverse insect pests: biological mode of action and biochemical aspects. | a new chemical compound was tested for its insecticidal activity against several major insect pests. the compound, called "flufenerim", has a core pyrimidine structure and an unknown mode of action and showed potent activity against the sweet potato whitefly bemisia tabaci (gennadius), the green peach aphid myzus persicae (sulzer), and the african cotton leafworm spodoptera littoralis (boisduval); however, it did not show any activity against two thrips species: western flower thrips frankliniel ... | 2010 | 20958045 |
| phylogenetic analysis and inflow route of tomato yellow leaf curl virus (tylcv) and bemisia tabaci in korea. | tomato yellow leaf curl virus (tylcv) is a member of the genus begomovirus of the family geminiviridae, members of which are characterized by closed circular single-stranded dna genomes of 2.7-2.8 kb in length, and include viruses transmitted by the bemisia tabaci whitefly. no reports of tylcv in korea are available prior to 2008, after which tylcv spread rapidly to most regions of the southern korean peninsula (gyeongsang-do, jeolla-do and jeju-do). fifty full sequences of tylcv were analyzed i ... | 2010 | 20981497 |
| reproductive incompatibility between the b and q biotypes of the whitefly bemisia tabaci in china: genetic and behavioural evidence. | the b and q 'biotypes' of bemisia tabaci (gennadius) (hemiptera: aleyrodidae) have been invading many parts of the world and causing severe damage to a range of crops. recent phylogenetic analyses indicate that b and q are cryptic species within the b. tabaci species complex. although various attempts have been made to examine the reproductive compatibility between b and q, few studies have tested the fertility of the f1 females and so the extent of possible gene flow remains unclear. in this st ... | 2011 | 21034521 |
| prevalence of wolbachia supergroups a and b in bemisia tabaci (hemiptera: aleyrodidae) and some of its natural enemies. | wolbachia, a bacterial symbiont, is maternally transmitted in arthropods and nematodes. we report a systematic survey of wolbachia taxonomy in the sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), and in some of its natural enemies. for the first time, wolbachia infections in b. tabaci are correlated with various whitefly genetic groups, host plants, and natural enemies as well as with geographical regions. polymerase chain reaction using 16s rdna and fisz genes revealed ... | 2010 | 21061989 |
| release of hormones from conjugates: chloroplast expression of β-glucosidase results in elevated phytohormone levels associated with significant increase in biomass and protection from aphids or whiteflies conferred by sucrose esters. | transplastomic tobacco (nicotiana tabacum) plants expressing β-glucosidase (bgl-1) show modified development. they flower 1 month earlier with an increase in biomass (1.9-fold), height (1.5-fold), and leaf area (1.6-fold) than untransformed plants. trichome density on the upper and lower leaf surfaces of bgl-1 plants increase by 10- and 7-fold, respectively, harboring 5-fold more glandular trichomes (as determined by rhodamine b staining), suggesting that bgl-1 lines produce more sugar esters th ... | 2010 | 21068365 |
| tomato-produced 7-epizingiberene and r-curcumene act as repellents to whiteflies. | how whiteflies (bemisia tabaci) make the choice for a host plant prior to landing, is not precisely known. here we investigated whether they respond to specific volatiles of tomato. zingiberene and curcumene were purified from solanum habrochaites (pi127826), characterised by nmr and x-ray analysis and identified as 7-epizingiberene and r-curcumene. in contrast, oil from zingiber officinalis contained the stereoisomers zingiberene and s-curcumene, respectively. using a combination of free-choice ... | 2011 | 21074818 |
| effectiveness of thiamethoxam and imidacloprid seed treatments against bemisia tabaci (hemiptera: aleyrodidae) on cotton. | bemisia tabaci (gennadius) biotype b is one of the most important pests on cotton around the world. laboratory, greenhouse and field experiments were conducted to determine the efficacy of thiamethoxam and imidacloprid seed treatments against b. tabaci on cotton. | 2011 | 21077123 |
| resistance of tomato genotypes to the greenhouse whitefly trialeurodes vaporariorum (west.) (hemiptera: aleyrodidae). | the greenhouse whitefly, trialeurodes vaporariorum westwood, is the most common and abundant whitefly in argentine horticultural greenhouse crops, especially in tomato (solanum lycopersicum). resistance in some wild tomato relatives, such as s. peruvianum, s. habrochaites and s. pennellii to the greenhouse whitefly has been described. the mi gene confers effective resistance against several species of insects, among them the sweet potato whitefly, bemisia tabaci gennadius. resistance to t. vapor ... | 2010 | 21120390 |
| identification and characterization of functional aquaporin water channel protein from alimentary tract of whitefly, bemisia tabaci. | some hemipteran xylem and phloem-feeding insects have evolved specialized alimentary structures or filter chambers that rapidly transport water for excretion or osmoregulation. in the whitefly, bemisia tabaci, mass movement of water through opposing alimentary tract tissues within the filter chamber is likely facilitated by an aquaporin protein. b. tabaci aquaporin-1 (btaqp1) possesses characteristic aquaporin topology and conserved pore-forming residues found in water-specific aquaporins. as pr ... | 2011 | 21146609 |
| induction effects of host plants on insecticide susceptibility and detoxification enzymes of bemisia tabaci (hemiptera: aleyrodidae). | the polyphagous b-biotype bemisia tabaci (gennadius) has developed a high resistance to commonly used insecticides in china. to illustrate the induced changes by host plant, bioassay and biochemical research on five different host populations were investigated. | 2011 | 21162148 |
| acquisition of lettuce infectious yellows virus by bemisia tabaci perturbs the transmission of lettuce chlorosis virus. | viruses in the genus crinivirus infect diverse plant species and are transmitted by specific whitefly vectors, but the basis for vector specific transmission remains poorly understood. here, we demonstrated that purified virion preparations of lettuce chlorosis virus (lcv) contained filamentous particles that were consistently transmitted to plants by whiteflies (bemisia tabaci biotypes a and b) following membrane feeding, suggesting that the preparations contained biologically active virions wi ... | 2011 | 21211541 |
| insecticidal activity against bemisia tabaci biotype b of peel essential oil of citrus sinensis var. pear and citrus aurantium cultivated in northeast brazil. | the fumigant action of peel essential oils of citrus sinensis var. pear (pear orange = po) and c. aurantium (bitter orange = bo) from the northeast of brazil were evaluated against bemisia tabaci biotype b and compared with eugenol as a positive control. the oil concentration in the po at 8.5 microl/l of air caused 97% mortality, while the oil concentration of bo at 9.5 microl/l of air caused 99% mortality. however, the lc50 estimates for both oils (lc50 = 3.80 microl/l of air for po and lc50 = ... | 2010 | 21213990 |
| insecticidal activity of some reducing sugars against the sweet potato whitefly, bemisia tabaci, biotype b. | the effects of 16 sugars (arabinose, cellobiose, fructose, galactose, gentiobiose, glucose, inositol, lactose, maltose, mannitol (a sugar alcohol), mannose, melibiose, ribose, sorbitol, trehalose, and xylose) on sweet potato whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) survival were determined using in vitro bioassays. of these sugars, arabinose, mannose, ribose, and xylose were strongly inhibitory to both nymphal and adult survival. when 10% mannose was added to the nymphal diet ... | 2010 | 21268696 |
| global analysis of the transcriptional response of whitefly to tomato yellow leaf curl china virus reveals the relationship of coevolved adaptations. | the begomoviruses are the largest and most economically important group of plant viruses transmitted exclusively by the whitefly bemisia tabaci in a circulative, persistent manner. the circulation of the viruses within the insect vectors involves complex interactions between virus and vector components; however, the molecular mechanisms of these interactions remain largely unknown. here we investigated the transcriptional response of the invasive b. tabaci middle east-asia minor 1 species to tom ... | 2011 | 21270146 |
| influence of trichomes on attractiveness and ovipositional preference of bemisia tabaci (genn.) b biotype (hemiptera: aleyrodidae) on tomato genotypes. | brazil is one of the world's largest tomato producer, but considerable part of the production is lost due to the attack of bemisia tabaci (genn.) b biotype. resistant germoplasm plants can be an important method for b. tabaci control in integrated pest management approaches. the attractiveness and ovipositional preference of b. tabaci for 17 tomato genotypes were evaluated in a free-choice test. trials were set up in a randomized block design with ten replicates. each replicate (one tomato plant ... | 2011 | 21271071 |
| an extensive field survey combined with a phylogenetic analysis reveals rapid and widespread invasion of two alien whiteflies in china. | to understand the processes of invasions by alien insects is a pre-requisite for improving management. the whitefly bemisia tabaci is a cryptic species complex that contains some of the most invasive pests worldwide. however, extensive field data to show the geographic distribution of the members of this species complex as well as the invasion by some of its members are scarce. | 2011 | 21283707 |
| using double-stranded rna to explore the role of heat shock protein genes in heat tolerance in bemisia tabaci (gennadius). | the whitefly, bemisia tabaci (gennadius) (homoptera: aleyrodidae) biotype b, is one of the most destructive invasive pests of field and glasshouse crops, and has a high tolerance to heat. our previous work found that whitefly females are more heat tolerant than males. in the present study, real-time pcr and double-stranded rna (dsrna) methods were used to explore the role of heat shock protein (hsp) genes in whitefly of both sexes; this provided further evidence of the mechanism underlying the d ... | 2011 | 21307062 |
| genetic identity of the bemisia tabaci species complex and association with high cotton leaf curl disease (clcud) incidence in pakistan. | the cotton whitefly, bemisia tabaci (gennadius), is a cryptic species complex, and members of the complex have become serious pests in pakistan because of their feeding and their ability to transmit cotton leaf curl virus (clcuv). here, an analysis was made of the identity of b. tabaci collected from cotton and a range of non-cotton hosts in the cotton-growing zones in punjab and sindh, the main cotton-producing provinces of pakistan, using a portion of the mitochondrial cytochrome oxidase 1 gen ... | 2010 | 21308956 |
| 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 |
| extraordinary resistance to insecticides reveals exotic q biotype of bemisia tabaci in the new world. | a strain of the whitefly bemisia tabaci (gennadius) possessing unusually high levels of resistance to a wide range of insecticides was discovered in 2004 in the course of routine resistance monitoring in arizona. the multiply resistant insects, collected from poinsettia (euphorbia pulcherrima willd. ex klotzsch) plants purchased at a retail store in tucson, were subjected to biotype analysis in three laboratories. polyacrylamide gel electrophoresis of naphthyl esterases and sequencing of the mit ... | 2010 | 21309242 |
| investigation of the genetic diversity of an invasive whitefly (bemisia tabaci) in china using both mitochondrial and nuclear dna markers. | it is often considered that reduced genetic variation due to bottlenecks and founder effects limits the capacity for species to establish in new environments and subsequently spread. the recent invasion (during the past five years) of an alien whitefly, one member of bemisia tabaci cryptic species complex, referred to as mediterranean (herein referred to as q-type) in shandong province, china, provides an ideal opportunity to study the changes in genetic variation between its home range in the m ... | 2011 | 21320364 |
| further insights into the strange role of bacterial endosymbionts in whitefly, bemisia tabaci: comparison of secondary symbionts from biotypes b and q in china. | the percentage infection of secondary symbionts (ss) (wolbachia, arsenophonus, rickettsia, hamiltonella, fritschea and cardinium) in the exotic bemisia tabaci (genn.) invaders, commonly known as biotypes b and q from china, were determined by pcr. in total, 373 biotype b and 1830 biotype q individuals were screened for the presence of ss. biotype b was more abundant than biotype q from 2005 to 2006, and biotype q was more abundant from 2007 to 2009. each of the ss, with the exception of fritsche ... | 2011 | 21329550 |
| asymmetry in thermal tolerance trade-offs between the b and q sibling species of bemisia tabaci (hemiptera: aleyrodidae). | we investigated life history trade-offs related to thermal tolerance in two sibling species, commonly referred to as the b and q biotypes, of bemisia tabaci. we focused on basal resistance to short unpredicted heat stress, which reflects the organism investment, during both optimal and stressful conditions, in insuring its survival. at 27 °c, the relative reproductive performance of b was seven-fold higher than q. after short stress of 42 °c, these differences increased to 23-fold. a turnover to ... | 2011 | 21338436 |
| resistance to tomato yellow leaf curl virus accumulation in the tomato wild relative solanum habrochaites associated with the c4 viral protein. | tomato yellow leaf curl disease (tylcd) is a severe threat to tomato crops worldwide and is caused by tomato yellow leaf curl virus (tylcv) and several other begomoviruses (genus begomovirus, family geminiviridae). host plant resistance is the best tylcd control method but limited sources of resistance are available. in this study, two solanum habrochaites tylcd-resistance sources, eelm-388 and eelm-889, were found after a wide germplasm screening and were further characterized. a consistent res ... | 2011 | 21405986 |
| resistance of soybean genotypes to bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae). | the silverleaf whitefly bemisia tabaci (genn.) biotype b has become a serious problem for soybean cultivation because it can significantly reduce soybean productivity. the use of soybean cultivars resistant to whitefly attack is an important strategy in an integrated pest management (ipm) program. this study evaluated the preference for oviposition and colonization by b. tabaci biotype b on different soybean genotypes. in the free-choice test, the genotypes studied were 'iac 17' and 'iac 19' as ... | 2011 | 21437493 |
| effect of methomyl and oxamyl soil applications on early control of nematodes and insects. | methomyl is a widely used carbamate insecticide that has traditionally been applied as a foliar spray. more recently, methomyl has been labeled as a soil application via drip chemigation. not much is known about the insecticidal and nematicidal potential of soil-applied methomyl. methomyl soil applications were evaluated for their potential to control soil nematodes and foliar insect pests in a series of lab and greenhouse tests. | 2011 | 21438120 |
| rna interference for the control of whiteflies (bemisia tabaci) by oral route. | rna interference (rnai)-mediated gene silencing was explored for the control of sap-sucking pest bemisia tabaci, commonly known as whitefly. dsrnas and sirnas were synthesized from five different genes - actin ortholog, adp/atp translocase, alpha-tubulin, ribosomal protein l9 (rpl9) and v-atpase a subunit. a simplified insect bioassay method was developed for the delivery of ds/sirna through the oral route, and efficacy was evaluated. ds/sirna caused 29-97% mortality after 6 days of feeding. eac ... | 2011 | 21451256 |
| rapid spread of a bacterial symbiont in an invasive whitefly is driven by fitness benefits and female bias. | maternally inherited bacterial symbionts of arthropods are common, yet symbiont invasions of host populations have rarely been observed. here, we show that rickettsia sp. nr. bellii swept into a population of an invasive agricultural pest, the sweet potato whitefly, bemisia tabaci, in just 6 years. compared with uninfected whiteflies, rickettsia-infected whiteflies produced more offspring, had higher survival to adulthood, developed faster, and produced a higher proportion of daughters. the symb ... | 2011 | 21474763 |
| symbiont diversity and non-random hybridization among indigenous (ms) and invasive (b) biotypes of bemisia tabaci. | the whitefly bemisia tabaci (hemiptera: aleyrodidae) is a worldwide pest and a vector of numerous plant viruses. b. tabaci is composed of dozens of morphologically indistinguishable biotypes and its taxonomic status is still controversial. this phloem-feeder harbours the primary symbiont portiera aleyrodidarum and potentially six secondary symbionts: cardinium, arsenophonus, hamiltonella, rickettsia, wolbachia and fritschea. in the southwest indian ocean, la réunion hosts two biotypes of this sp ... | 2011 | 21476990 |
| complete nucleotide sequence of croton yellow vein mosaic virus and dna-β associated with yellow vein mosaic disease of jatropha gossypifolia in india. | a severe yellow vein mosaic disease was noticed on several jatropha gossypifolia plants growing nearby agriculture fields at lucknow, india. diseased plants exhibited yellow vein mosaic, leaf deformation, vein swelling and stunting. a population of whiteflies (bemisia tabaci) was also noticed in the vicinities; therefore, begomovirus infection was suspected. to confirm begomovirus association, total dna was isolated from symptomatic leaf samples and subjected to pcr using dna-a, dna-b and dna-β- ... | 2011 | 21479677 |
| contact and fumigant toxicity of plant essential oils and efficacy of spray formulations containing the oils against b- and q-biotypes of bemisia tabaci. | background: the contact + fumigant toxicity of 92 plant essential oils and control efficacy of 18 experimental spray formulations containing nine selected essential oils (0.5 and 0.1% sprays) and six commercial insecticides to females from b- and q-biotypes of bemisia tabaci were evaluated using vapour-phase mortality and spray bioassays. results: garlic and oregano (lc(50) , 0.15 ml cm(-3) ) were the most toxic oils against b- and q-biotype females. strong fumigant toxicity to both biotype fema ... | 2011 | 21480461 |
| populations of predators and parasitoids of bemisia tabaci (hemiptera: aleyrodidae) after the application of eight biorational insecticides in vegetable crops. | the sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), is an important pest of vegetables and many other crops worldwide. eight biorational insecticides (based on oil, plant derivatives, insect growth regulator and fungus) were evaluated in the field for their influence on populations of six natural enemies of b. tabaci. natural populations of two predators [chrysoperla carnea stephen (neuroptera: chrysopidae) and orius spp. (hemiptera: anthocoridae)] and two genera of pa ... | 2011 | 21480463 |
| genetic diversity, geographical range and origin of bemisia tabaci (hemiptera: aleyrodidae) indian ocean ms. | the whitefly bemisia tabaci is a pest vector of begomoviruses on crops worldwide. bemisia tabaci is composed of a complex of cryptic species which barely interbreed. an exception is the ms from the south west indian ocean (swio), which crosses in low proportions with the exotic b. the ms, together with b and q is part of the same phylogenetic clad. to infer the genetic structure, the geographical range and putative origin of this putative species, microsatellite data and mitochondrial dna (cytoc ... | 2011 | 21492491 |
| field trial measuring the compatibility of methoxyfenozide and flonicamid with orius laevigatus fieber (hemiptera: anthocoridae) and amblyseius swirskii (athias-henriot) (acari: phytoseiidae) in a commercial pepper greenhouse. | frankliniella occidentalis (pergande) (thysanoptera: thripidae) and bemisia tabaci (gennadius) (hemiptera: aleyrodidae) are among the most serious pests of sweet peppers in greenhouses. chemical control is difficult because of their high reproductive rates and insecticide resistance, and seasonal inoculative releases of orius laevigatus (fieber) and amblyseius swirskii (athias-henriot) are commonly used to reduce their populations. as chemical treatments are often needed in the crop against othe ... | 2011 | 21495158 |
| effects of selected fertilizers on the life history of bemisia tabaci (hemiptera: aleyrodidae) biotype b. | we tested the effects among a purportedly sustainable water-soluble fertilizer, a conventional water-soluble fertilizer, an alternation of these, a controlled-release fertilizer, and a clear water control on the life-history traits of sweetpotato whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae; =bemisia argentifolii bellows & perring) biotype b reared on poinsettia (euphorbia pulcherrima willdenow ex klotzch). free amino acids in petioles were measured to estimate plant nutrient ass ... | 2011 | 21510203 |
| host plant effects on alkaline phosphatase activity in the whiteflies, bemisia tabaci biotype b and trialeurodes vaporariorum. | bemisia tabaci (gennadius) b-biotype and trialeurodes vaporariorum (westwood) (hemiptera: aleyrodidae) often coexist on greenhouse-grown vegetable crops in northern china. the recent spread of b. tabaci b-biotype has largely replaced t. vaporariorum, and b-biotype now overlaps with t. vaporariorum where common hosts occur in most invaded areas. the impact of the b-biotype on the agro eco system appears to be widespread, and involves the ability to compete with and perhaps replace other phytophag ... | 2011 | 21521136 |
| compatibility of a melia azedarach extract with eriopis connexa (coleoptera: coccinellidae). | the integrated pest management (ipm) premises claim for a joint use of beneficial organisms (parasitoids and predators) and selective pesticides. botanical pesticides are being considered as selective pesticides. during the last 20 years of the 20th century, the plant family meliaceae was identified as a promising source of compounds with insect-control properties. the chinaberry tree, melia azedarach l., is a deciduous tree native to persia, india, and china, but has been cultivated in many cou ... | 2010 | 21539256 |
| molecular characterization and oxidative stress response of an intracellular cu/zn superoxide dismutase (cuznsod) of the whitefly, bemisia tabaci. | superoxide dismutases (sods) are important for the survival of insects under environmental and biological stresses; however, little attention has been devoted to the functional characterization of sods in whitefly. in this study, an intracellular copper/zinc superoxide dismutase of whitefly (bemisia tabaci) (bt-cuznsod) was cloned. sequence analysis indicated that the full length cdna of bt-cuznsod is of 907 bp with a 471 bp open reading frame encoding 157 amino acids. the deduced amino acid seq ... | 2011 | 21541989 |
| exploring the diversity of plant dna viruses and their satellites using vector-enabled metagenomics on whiteflies. | current knowledge of plant virus diversity is biased towards agents of visible and economically important diseases. less is known about viruses that have not caused major diseases in crops, or viruses from native vegetation, which are a reservoir of biodiversity that can contribute to viral emergence. discovery of these plant viruses is hindered by the traditional approach of sampling individual symptomatic plants. since many damaging plant viruses are transmitted by insect vectors, we have deve ... | 2011 | 21544196 |
| comparing the regional epidemiology of the cassava mosaic and cassava brown streak virus pandemics in africa. | the rapid geographical expansion of the cassava mosaic disease (cmd) pandemic, caused by cassava mosaic geminiviruses, has devastated cassava crops in 12 countries of east and central africa since the late 1980s. region-level surveys have revealed a continuing pattern of annual spread westward and southward along a contiguous 'front'. more recently, outbreaks of cassava brown streak disease (cbsd) were reported from uganda and other parts of east africa that had been hitherto unaffected by the d ... | 2011 | 21549776 |
| emerging virus diseases transmitted by whiteflies. | virus diseases that have emerged in the past two decades limit the production of important vegetable crops in tropical, subtropical, and temperate regions worldwide, and many of the causal viruses are transmitted by whiteflies (order hemiptera, family aleyrodidae). most of these whitefly-transmitted viruses are begomoviruses (family geminiviridae), although whiteflies are also vectors of criniviruses, ipomoviruses, torradoviruses, and some carlaviruses. factors driving the emergence and establis ... | 2011 | 21568700 |
| [population genetic structure of bemisia tabaci (hemiptera: aleyrodidae) utilizing microsatellite markers]. | we aimed to characterize the population genetic structure within and among five bemisia tabaci (gennadius) populations collected from different host plants and geographic regions by using microssatelites as a molecular marker. each population was represented by 19 specimens. the host plants and geographic origins of these populations were described as follows: pop 1: squash barreiras (ba); pop 2: cotton barreiras (ba); pop 3: soybean campinas (sp); pop 4: tomato cruz das almas (ba); and pop 5: s ... | 2011 | 21584401 |
| twelve new polymorphic microsatellite loci and pcr multiplexing in the whitefly, bemisia tabaci. | twelve new dinucleotide microsatellite loci of the whitefly, bemisia tabaci, were obtained from enriched genomic libraries. three polymerase chain reaction multiplex sets comprising three, five and four loci were optimized and characterized across 133 b. tabaci females from israeli rearings and natural populations collected in four mediterranean countries (tunisia, france, spain and morocco). there were three to 24 alleles per locus and the observed heterozygosity was from 0.084 to 0.420. deviat ... | 2008 | 21585955 |
| biological activity of natural phytoecdysteroids from ajuga iva against the sweetpotato whitefly bemisia tabaci and the persea mite oligonychus perseae. | background: ecdysteroids are steroid hormones that control moulting and govern several changes during metamorphoses in arthropods. the discovery of the same molecules (phytoecdysteroids) in several plant species displayed a wide array of rather beneficial agricultural impact. many representatives of the genus ajuga plants contain phytoecdysteroids with a 5β-7-ene-6-one system exhibiting physiological activities in insects. results: by means of chromatographic (silica gel column, tlc) and lc-ms, ... | 2011 | 21604353 |
| whitefly resistance traits derived from the wild tomato solanum pimpinellifollium affect the preference and feeding behavior of bemisia tabaci and reduce the spread of tomato yellow leaf curl virus. | breeding of tomato genotypes that limit whitefly (bemisia tabaci) access and feeding might reduce the spread of tomato yellow leaf curl virus (tylcv), a begomovirus (genus begomovirus, family geminiviridae) that is the causal agent of tomato yellow leaf curl disease. tylcv is restricted to the phloem and is transmitted in a persistent manner by b. tabaci. the tomato breeding line abl 14-8 was developed by introgressing type iv leaf glandular trichomes and secretion of acylsucroses from the wild ... | 2011 | 21615206 |
| 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 |
| rickettsia 'in' and 'out': two different localization patterns of a bacterial symbiont in the same insect species. | intracellular symbionts of arthropods have diverse influences on their hosts, and their functions generally appear to be associated with their localization within the host. the effect of localization pattern on the role of a particular symbiont cannot normally be tested since the localization pattern within hosts is generally invariant. however, in israel, the secondary symbiont rickettsia is unusual in that it presents two distinct localization patterns throughout development and adulthood in i ... | 2011 | 21712994 |
| 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 |
| adulticidal activity of phthalides identified in cnidium officinale rhizome to b- and q-biotypes of bemisia tabaci. | the residual contact toxicity of three benzofuranoids (z)-butylidenephthalide (1), (3s)-butylphthalide (2), and (z)-ligustilide (3) identified in the rhizome of cnidium officinale (apiaceae) to b- and q-biotype females of bemisia tabaci was evaluated using a leaf-dip bioassay. results were compared with those of eight conventional insecticides. based on 24 h lc(50) values, (z)-butylidenephthalide (254 ppm) and (z)-ligustilide (268 ppm) were more toxic than (3s)-butylphthalide (339 ppm) against b ... | 2011 | 21728333 |
| 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 |
| 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 |
| suppressors of rna silencing encoded by the components of the cotton leaf curl begomovirus-betasatellite complex. | begomoviruses (family geminiviridae) are single-stranded dna viruses transmitted by the whitefly bemisia tabaci. many economically important diseases in crops are caused by begomoviruses, particularly in tropical and subtropical environments. these include the betasatellite-associated begomoviruses causing cotton leaf curl disease (clcud) that causes significant losses to a mainstay of the economy of pakistan, cotton. rna interference (rnai) or gene silencing is a natural defense response of pla ... | 2011 | 21751853 |
| [adult oviposition and larvae feeding behavior of spodoptera litura (lepidoptera: noctuidae) on tobacco plants after infested by b-biotype bemisia tabaci (homoptera: aleyrodidae)]. | to understand the effects of the defense responses of tobacco plants induced by the infesting of b-biotype bemisia tabaci to spodoptera litura, and to explore the mechanisms of the interspecific interactions between b-biotype b. tabaci and s. litura, a laboratory experiment was conducted to study the effects of tobacco plants after infested by b-biotype b. tabaci on the adult oviposition selection and the larvae feeding, anti-feeding, and other feeding behaviors of s. litura. comparing with that ... | 2011 | 21812310 |
| a novel synthetic quantification standard including virus and internal report targets: application for the detection and quantification of emerging begomoviruses on tomato. | abstract: background: begomovirus is a genus of phytopathogenic single-stranded dna viruses, transmitted by the whitefly bemisia tabaci. this genus includes emerging and economically significant viruses such as those associated with tomato yellow leaf curl disease, for which diagnostic tools are needed to prevent dispersion and new introductions. five real-time pcrs with an internal tomato reporter gene were developed for accurate detection and quantification of monopartite begomoviruses, includ ... | 2011 | 21819593 |
| 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 |
| 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 |
| 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 |
| characterization of cucumber vein-clearing virus, a whitefly (bemisia tabaci g.)-transmitted carlavirus. | 2011 | 21956832 | |
| 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 |
| molecular identification of a new begomovirus associated with yellow mosaic disease of jatropha gossypifolia in india. | yellow mosaic disease was observed on jatropha gossypifolia plants growing in kathaupahadi, madhya pradesh, india, and whiteflies (bemisia tabaci) were found in the vicinity. association of a new begomovirus with yellow mosaic disease of j. gossypifolia has been detected by pcr using begomovirus dna-a-specific primers. the complete dna-a genome (~2.7 kb) of this virus isolate was amplified by rolling-circle amplification (rca) followed by digestion with bam hi. the ~2.7-kb amplicons was cloned a ... | 2011 | 21971870 |
| 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 |
| yellowing disease in zucchini squash produced by mixed infections of cucurbit yellow stunting disorder virus and cucumber vein yellowing virus. | zucchini squash is host to cucurbit yellow stunting disorder virus (cysdv), a member of the genus crinivirus, and cucumber vein yellowing virus (cvyv), a member of the genus ipomovirus, both transmitted by the whitefly bemisia tabaci. field observations suggest the appearance of new symptoms observed on leaves of zucchini squash crops when both viruses were present. when infected during controlled experiments with cysdv only, zucchini plants showed no obvious symptoms and the virus titer decreas ... | 2011 | 21999160 |
| oral toxicity of photorhabdus culture media on gene expression of the adult sweetpotato whitefly, bemisia tabaci. | the oral toxicity of culture media of the symbiotic bacteria, photorhabdus temperata, mutually associated with entomopathogenic nematode heterorhabditis megidis and photorhabdus luminescens ssp. laumondii (tt01) mutually associated with heterorhabditis bacteriophora, were investigated in the adults of bemisia tabaci. the oral ingestion of sucrose diet solutions (20%) containing bacteria-free supernatant of the culture media from symbiotic bacteria gradually increased mortalities and was complete ... | 2012 | 22041203 |
| Sweepoviruses cause disease in sweet potato and related Ipomoea spp.: fulfilling Koch's postulates for a divergent group in the genus begomovirus. | Sweet potato (Ipomoea batatas) and related Ipomoea species are frequently infected by monopartite begomoviruses (genus Begomovirus, family Geminiviridae), known as sweepoviruses. Unlike other geminiviruses, the genomes of sweepoviruses have been recalcitrant to rendering infectious clones to date. Thus, Koch's postulates have not been fullfilled for any of the viruses in this group. Three novel species of sweepoviruses have recently been described in Spain: Sweet potato leaf curl Lanzarote virus ... | 2011 | 22073314 |
| pinellia ternata agglutinin expression in chloroplasts confers broad spectrum resistance against aphid, whitefly, lepidopteran insects, bacterial and viral pathogens. | broad spectrum protection against different insects and pathogens requires multigene engineering. however, such broad spectrum protection against biotic stress is provided by a single protein in some medicinal plants. therefore, tobacco chloroplasts were transformed with the agglutinin gene from pinellia ternata (pta), a widely cultivated chinese medicinal herb. pinellia ternata agglutinin (pta) was expressed up to 9.2% of total soluble protein in mature leaves. purified pta showed similar hemag ... | 2011 | 22077160 |
| analysis of the tomato mild mottle virus genome indicates that it is the most divergent member of the genus ipomovirus (family potyviridae). | the complete genome of a tomato mild mottle virus (tommv) isolate was analysed, and some biological features were characterized. the ssrna genome of tommv from ethiopia encompasses 9283 nucleotides (excluding the 3' poly(a) tail) and encodes a polyprotein of 3011 amino acids. phylogenetic and pairwise comparisons with other members of the family potyviridae revealed that tommv is the most divergent member of the genus ipomovirus, with a genome organization similar to that of members of the speci ... | 2012 | 22080188 |
| eggplant mild leaf mottle virus (emlmv), a new putative member of the genus ipomovirus that harbors an hc-pro gene. | since 2003, a new viral disease of eggplant (solanum melongena l.) has been spreading in fields in the jordan and arava valleys, israel. the symptoms of this disease include mild leaf mottling and varying degrees of fruit distortion. this disease can be transmitted by mechanical sap inoculation, as well as by the whitefly bemisia tabaci (homoptera, aleyrodidae) and has been tentatively named eggplant mild leaf mottle virus (emlmv). our study aimed to determine the complete sequence and genome or ... | 2012 | 22086504 |
| Horizontal transmission of the insect symbiont Rickettsia is plant-mediated. | Bacteria in the genus Rickettsia, best known as vertebrate pathogens vectored by blood-feeding arthropods, can also be found in phytophagous insects. The presence of closely related bacterial symbionts in evolutionarily distant arthropod hosts presupposes a means of horizontal transmission, but no mechanism for this transmission has been described. Using a combination of experiments with live insects, molecular analyses and microscopy, we found that Rickettsia were transferred from an insect hos ... | 2011 | 22113034 |
| 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 |
| Interspecific Interactions Between Bemisia tabaci Biotype B and Trialeurodes vaporariorum (Hemiptera: Aleyrodidae). | Bemisia tabaci (Gennadius) biotype B and Trialeurodes vaporariorum (Westwood) are invasive whitefly species that often co-occur on greenhouse-grown vegetables in northern China. Although B. tabaci biotype B has been present in China for a relatively short period of time, it has become dominant over T. vaporariorum. We studied the interspecific competitive interactions between the two species in single or mixed cultures at 24 ± 1°C, 40 ± 5% RH, and L14:D10 h photoperiod. Female longevity on toma ... | 2011 | 22182623 |
| insights into the transcriptomics of polyphagy: bemisia tabaci adaptability to phenylpropanoids involves coordinated expression of defense and metabolic genes. | the whitefly bemisia tabaci is a major generalist agricultural pest of field and horticultural crops world-wide. despite its importance, the molecular bases of defense mechanisms in b. tabaci against major plant secondary defense compounds, such as the phenylpropanoids, remain unknown. our experimental system utilized transgenic nicotiana tabacum plants constitutively expressing the pap1/atmyb75 transcription factor which activates relatively specifically the phenylpropanoid/flavonoids biosynthe ... | 2011 | 22212826 |
| large-scale, spatially-explicit test of the refuge strategy for delaying insecticide resistance. | the refuge strategy is used worldwide to delay the evolution of pest resistance to insecticides that are either sprayed or produced by transgenic bacillus thuringiensis (bt) crops. this strategy is based on the idea that refuges of host plants where pests are not exposed to an insecticide promote survival of susceptible pests. despite widespread adoption of this approach, large-scale tests of the refuge strategy have been problematic. here we tested the refuge strategy with 8 y of data on refuge ... | 2012 | 22215605 |
| molecular characterization of bemisia tabaci populations in tunisia: genetic structure and evidence for multiple acquisition of secondary symbionts. | a survey was conducted during 2009-2010 seasons to identify the distribution of bemisia tabaci (gennadius) biotypes in tunisia. the genetic affiliation of collected populations was determined by polymerase chain reaction (pcr)-restriction fragment-length polymorphism (taqi) of the mitochondrial cytochrom oxidase i (mtcoi) gene. results, validated by sequencing and phylogenetic analysis, allowed the clustering of sampled sweetpotato whiteflies into b and q biotypes. as b. tabaci harbors the obli ... | 2011 | 22251681 |
| 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 |
| 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 |
| 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 |
| 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 |
| molecular studies on the transmission of indian cassava mosaic virus (icmv) and sri lankan cassava mosaic virus (slcmv) in cassava by bemisia tabaci and cloning of icmv and slcmv replicase gene from cassava. | cassava mosaic disease, caused by cassava mosaic geminiviruses are transmitted by bemisia tabaci. the b. tabaci adults from colonies reared on virus free cassava plant produced from apical meristem culture was studied to determine their ability to transmit indian cassava mosaic virus (icmv) and sri lankan cassava mosaic virus (slcmv) from cassava to cassava. virus free plants were confirmed by polymerase chain reaction (pcr) using geminivirus degenerate primers. the virus acquisition access peri ... | 2012 | 22302313 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| factors affecting population dynamics of maternally transmitted endosymbionts in bemisia tabaci. | while every individual of bemisia tabaci (hemiptera: aleyrodidae) harbors the primary symbiont (p-symbiont) portiera, the infection frequencies of the six secondary symbionts (s-symbionts) including hamiltonella, arsenophonus, cardinium, wolbachia, rickettsia and fritschea vary greatly among different populations. to characterize the factors influencing the infection dynamics of the six s-symbionts in b. tabaci, gene-specific pcr were conducted to screen for the presence of the p-symbiont portie ... | 2012 | 22383972 |
| 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 |
| role of betasatellite in the pathogenesis of a bipartite begomovirus affecting tomato in india. | betasatellites are commonly associated with tomato leaf curl disease caused by begomoviruses in india. this study demonstrates the role of a betasatellite in the pathogenesis of tomato leaf curl new delhi virus (tolcndv), a bipartite begomovirus affecting tomato in india. for infection, accumulation, systemic movement and disease induction by tolcndv, co-infection by the associated betasatellite was not essential, as the dna a alone of tolcndv could infect tomato and nicotiana benthamiana and in ... | 2012 | 22418785 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| [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 |
| 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 |