Publications

identification and characterization of a novel whitefly-transmitted member of the family potyviridae isolated from cucurbits in florida.	abstract a novel whitefly-transmitted member of the family potyviridae was isolated from a squash plant (cucurbita pepo) with vein yellowing symptoms in florida. the virus, for which the name squash vein yellowing virus (sqvyv) is proposed, has flexuous rod-shaped particles of approximately 840 nm in length. the experimental host range was limited to species in the family cucurbitaceae, with the most dramatic symptoms observed in squash and watermelon, but excluded all tested species in the fami ...	2007	18944369
three years survey of tomato yellow leaf curl sardinia virus reservoir weed hosts in southern italy.	during the period from august 2004 to june 2006 a serious tomato yellow leaf curl epidemic caused by both tomato yellow leaf curl sardinia virus (tylcsv) and tomato yellow leaf curl virus (tylcs) was observed in protected tomato crops in castrovillari, calabria region, in a group of greenhouses where tomato is grown hydroponically. a three years survey for reservoir weed hosts of these viruses was performed during summer period in order to identify where the viruses persist during the host-free ...	2007	18396845
relationship between tomato yellow leaf curl viruses and the whitefly vector.	tomato yellow leaf curl virus (tylcv) and tomato leaf curl virus (tolcv) are the currently known begomoviruses in uganda. the relationship with their whiteflies (bemisia tabaci) vector and its management were not known in uganda. a direct relationship was expected between these begomoviruses and whiteflies at buwama in mpigi district of uganda. farmer practices were expected to have limited efficacy. to investigate this, a completely randomised block design was used for all trials with six treat ...	2007	18396846
an approach for ipm program to control sucking pests infesting garden bean plants (phaseolus vulgaris l.) in egypt.	an approach to eatablish ipm program for some sucking pests infesting garden beans plants was carried out in two successive seasons of 2004 and 2005 under field conditions in alexandria, egypt. the sucking pests included the aphid, aphis craccivora koch (homoptera: aphididae), the white fly, bemisia tabaci genn. (homoptera: aleyroidae) and the spider mite, tetranychus urticae koch pymetrozine, thiamethoxam, carbosulfan, abamectin, azadirachtin and the detergent (masrol 410) were tested for their ...	2007	18399490
biotype status and distribution of bemisia tabaci (hemiptera: aleyrodidae) in shandong province of china based on mitochondrial dna markers.	bemisia tabaci has caused significant crop losses in china during the last decade. recent research has shown that two potentially invasive variants, biotypes b and q, have been found in several regions of china. our objective was to determine the biotype status and the distribution of b. tabaci in shandong province, an important agricultural region of china. based on mitochondrial dna markers, both biotypes b and q were detected, with b being the predominant biotype. the results indicate that th ...	2007	18284755
expression of stress-response proteins upon whitefly-mediated inoculation of tomato yellow leaf curl virus in susceptible and resistant tomato plants.	to better understand the nature of resistance of tomato to the whitefly (bemisia tabaci, b biotype)-transmitted tomato yellow leaf curl virus (tylcv), whiteflies and tylcv were considered as particular cases of biotic stresses and virus resistance as a particular case of successful response to these stresses. two inbred tomato lines issued from the same breeding program that used solanum habrochaites as a tylcv resistance source, one susceptible and the other resistant, were used to compare the ...	2007	17977149
asymmetric mating interactions drive widespread invasion and displacement in a whitefly.	the role of behavioral mechanisms in animal invasions is poorly understood. we show that asymmetric mating interactions between closely related but previously allopatric genetic groups of the whitefly bemisia tabaci, a haplodiploid species, have been a driving force contributing to widespread invasion and displacement by alien populations. we conducted long-term field surveys, caged population experiments, and detailed behavioral observations in zhejiang, china, and queensland, australia, to inv ...	2007	17991828
a multiplex pcr method discriminating between the tylcv and tylcv-mld clades of tomato yellow leaf curl virus.	tomato yellow leaf curl virus (tylcv) is one of the causal agents of tomato yellow leaf curl disease (tylcd) and can cause up to 100% yield losses in tomato fields. as tylcv continues to spread, many isolates have been described in different parts of the world. recently two closely related but distinct tylcv clades, called tylcv and tylcv-mld, have been identified. isolates from those two clades differ mainly in the nucleotide sequences of their replication associated protein genes but do not di ...	2007	17485124
prevalence of wolbachia infection in bemisia tabaci.	wolbachia are obligate intracellular bacteria present in reproductive tissues of many arthropod species. it has been reported that few silverleafing populations of bemisia tabaci were positive for wolbachia, whereas non-silverleafing populations were more likely infected with wolbachia and all that infect b. tabaci are wolbachia belonging to supergroup b. however, current detection methods were shown to be not sensitive enough to uncover all infections. herein, a protocol based on polymerase cha ...	2007	17487529
ligand binding by recombinant domains from insect ecdysone receptors.	the ligand binding domains (lbds) from the ecr and usp proteins of four insect pests (lucilia cuprina, myzus persicae, bemisia tabaci, helicoverpa armigera) were purified as recombinant heterodimers. the k(d) values for [(3)h]-ponasterone a binding by lbd heterodimers that included the hinge regions (i.e., de/f heterodimers) ranged 0.7-2.5 nm, with k(i) values for ecdysteroid and dibenzoylhydrazine ligands ranging from 0.1 nm to >448 microm. the k(d) and k(i) values for a recombinant h. armigera ...	2007	17517338
rnai-mediated resistance to bean golden mosaic virus in genetically engineered common bean (phaseolus vulgaris).	bean golden mosaic virus (bgmv) is transmitted by the whitefly bemisia tabaci in a persistent, circulative manner, causing the golden mosaic of common bean (phaseolus vulgaris l.). the characteristic symptoms are yellow-green mosaic of leaves, stunted growth, or distorted pods. the disease is the largest constraint to bean production in latin america and causes severe yield losses (40 to 100%). here, we explored the concept of using an rna interference construct to silence the sequence region of ...	2007	17555279
development of real-time rt-pcr assays for the detection of cucumber vein yellowing virus (cvyv) and cucurbit yellow stunting disorder virus (cysdv) in the whitefly vector bemisia tabaci.	reverse transcription followed by real-time pcr assays based on taqman chemistry have been developed for the detection and quantification of cucumber vein yellowing virus (cvyv) and cucurbit yellow stunting disorder virus (cysdv) in individual adults of the whitefly vector bemisia tabaci. the method includes an internal control for the detection of a gene from b. tabaci to compensate for variations in extraction efficiency. the assays designed were used to estimate proportions of viruliferous wh ...	2007	17624449
biotype-dependent secondary symbiont communities in sympatric populations of bemisia tabaci.	the sweet potato whitefly, bemisia tabaci, harbors portiera aleyrodidarum, an obligatory symbiotic bacterium, as well as several secondary symbionts including rickettsia, hamiltonella, wolbachia, arsenophonus, cardinium and fritschea, the function of which is unknown. bemisia tabaci is a species complex composed of numerous biotypes, which may differ from each other both genetically and biologically. only the b and q biotypes have been reported from israel. secondary symbiont infection frequenci ...	2007	17645822
toxicity of seven foliar insecticides to four insect parasitoids attacking citrus and cotton pests.	laboratory studies were carried out to compare the toxicity of seven foliar insecticides to four species of adult beneficial insects representing two families of hymenoptera: aphelinidae (aphytis melinus debach, eretmocerus eremicus rose & zolnerowich, and encarsiaformosa gahan) and mymaridae (gonatocerus ashmeadi girault) that attack california red scale, aonidiella aurantii (maskell); sweetpotato whitefly, bemisia tabaci (gennadius) (both e. eremicus and e. formosa); and glassy-winged sharpsho ...	2007	17849851
effects of proportion and configuration of bacillus thuringiensis cotton on pest abundance, damage, and yield.	bacillus thuringiensis (bt) transgenic cotton, gossypium hirsutum l., kills several economically important pests, reducing injury and increasing yields. refuges of non-bt cotton are currently planted with bt cotton in different designs to slow pest resistance evolution. to compare the effects of differences in bt/non-bt plant heterogeneity found in different refuge designs on square (flower bud) damage, abscissions, sap-feeding herbivore densities, and yield in cotton, four types of 24-row cotto ...	2007	17849898
pcr-based detection and partial genome sequencing indicate high genetic diversity in bangladeshi begomoviruses and their whitefly vector, bemisia tabaci.	the population diversity of bangladeshi begomoviruses and their vector, bemisia tabaci was analysed by pcr-based detection and partial genome sequencing. b. tabaci adults and plants expressing symptoms of virus infection were collected from locations representing diverse agro-ecological regions of the country. universal and species-specific primers were used to detect begomoviruses in seven crops (chilli, okra, papaya, pumpkin, sponge gourd, tomato and yardlong bean) and two common weeds (agerat ...	2007	16927121
vector-virus mutualism accelerates population increase of an invasive whitefly.	the relationships between plant viruses, their herbivore vectors and host plants can be beneficial, neutral, or antagonistic, depending on the species involved. this variation in relationships may affect the process of biological invasion and the displacement of indigenous species by invaders when the invasive and indigenous organisms occur with niche overlap but differ in the interactions. the notorious invasive b biotype of the whitefly complex bemisia tabaci entered china in the late 1990s an ...	2007	17264884
purification and characterization of recombinant ligand-binding domains from the ecdysone receptors of four pest insects.	cloned ecr and usp cdnas encoding the ecdysone receptors of four insect pests (lucilia cuprina, myzus persicae, bemisia tabaci, helicoverpa armigera) were manipulated to allow the co-expression of their ligand binding domains (lbds) in insect cells using a baculovirus vector. recombinant de/f segment pairs (and additionally, for h. armigera, an e/f segment pair) from the ecr and usp proteins associated spontaneously with high affinity to form heterodimers that avidly bound an ecdysteroid ligand. ...	2007	17275327
biotype status and genetic polymorphism of the whitefly bemisia tabaci (hemiptera: aleyrodidae) in greece: mitochondrial dna and microsatellites.	the genetic polymorphism and the biotype identity of the tobacco whitefly bemisia tabaci (gennadius) have been studied in population samples taken from different localities within greece from cultivated plants growing in greenhouses or in open environments and from non-cultivated plants. two different approaches were used: sequencing of the mitochondrial cytochrome oxidase i (mtcoi) gene and genotyping using microsatellite markers. analyses of the mtcoi sequences revealed a high homogeneity betw ...	2007	17298679
making a friend from a foe: expressing a groel gene from the whitefly bemisia tabaci in the phloem of tomato plants confers resistance to tomato yellow leaf curl virus.	some (perhaps all) plant viruses transmitted in a circulative manner by their insect vectors avoid destruction in the haemolymph by interacting with groel homologues, ensuring transmission. we have previously shown that the phloem-limited begomovirus tomato yellow leaf curl virus (tylcv) interacts in vivo and in vitro with groel produced by the whitefly vector bemisia tabaci. in this study, we have exploited this phenomenon to generate transgenic tomato plants expressing the whitefly groel in th ...	2007	17334947
the mi-1-mediated pest resistance requires hsp90 and sgt1.	the tomato (solanum lycopersicum) mi-1 gene encodes a protein with putative coiled-coil nucleotide-binding site and leucine-rich repeat motifs. mi-1 confers resistance to root-knot nematodes (meloidogyne spp.), potato aphids (macrosiphum euphorbiae), and sweet potato whitefly (bemisia tabaci). to identify genes required in the mi-1-mediated resistance to nematodes and aphids, we used tobacco rattle virus (trv)-based virus-induced gene silencing (vigs) to repress candidate genes and assay for nem ...	2007	17351050
arabidopsis transcriptome changes in response to phloem-feeding silverleaf whitefly nymphs. similarities and distinctions in responses to aphids.	phloem-feeding pests cause extensive crop damage throughout the world, yet little is understood about how plants perceive and defend themselves from these threats. the silverleaf whitefly (slwf; bemisia tabaci type b) is a good model for studying phloem-feeding insect-plant interactions, as slwf nymphs cause little wounding and have a long, continuous interaction with the plant. using the affymetrix ath1 genechip to monitor the arabidopsis (arabidopsis thaliana) transcriptome, 700 transcripts we ...	2007	17189325
silverleaf whitefly induces salicylic acid defenses and suppresses effectual jasmonic acid defenses.	the basal defenses important in curtailing the development of the phloem-feeding silverleaf whitefly (bemisia tabaci type b; slwf) on arabidopsis (arabidopsis thaliana) were investigated. sentinel defense gene rnas were monitored in slwf-infested and control plants. salicylic acid (sa)-responsive gene transcripts accumulated locally (pr1, bgl2, pr5, sid2, eds5, pad4) and systemically (pr1, bgl2, pr5) during slwf nymph feeding. in contrast, jasmonic acid (ja)- and ethylene-dependent rnas (pdf1.2, ...	2007	17189328
prey species preference of the predator serangium parcesetosum sicard (col., coccinellidae) and its interaction with another natural enemy.	this study aimed to determine serangium parcesetosum preference for different prey species and parasitized bemisia tabaci (genn.) (hom., aleyrodidae) by the parasitoid, eretmocerus mundus mercet (hym., aphelinidae). the results on s. parcesetosum preference by feeding on different prey species offered separately and together indicated that the predatory larvae and adults preferred significantly the cotton whitefly, b. tabaci and the castor bean whitefly, trialeurodes ricini (misra) (hom., aleyro ...	2007	19070175
thermal effect on the biology and life tables of bemisia tabaci gennadius (homoptera: aleyrodidae).	the life history and life table of bemisia tabaci gennadius on cucumber was studied under laboratory conditions at 20, 25 and 30 degrees c. the overall developmental time varied from 34.8 days at 20 degrees c to 14.1 days at 30 degrees c. immature mortality decreased from 45.8 to 17.3% with increasing temperature. the threshold temperatures of egg, 1st, 2nd, 3rd and 4th nymphal stage and a generation were 14.72, 14.36, 10.18, 11.40, 14.36 and 13.07 degrees c whereas the degree-day requirement at ...	2007	19090279
a recessive allele (tgr-1) conditioning tomato resistance to geminivirus infection is associated with impaired viral movement.	abstract begomoviruses (the family geminiviridae) are transmitted by the whitefly bemisia tabaci and contain monopartite or bipartite circular single-stranded (ss)dna genomes. they have emerged as severe problems in the production of agricultural and horticultural crops worldwide. here, we report the identification of a tomato breeding line, fla653, that confers a high level of resistance to tomato leaf curl virus (tlcv, monopartite). genetic analysis indicated that the resistance is controlled ...	2007	18943632
legume yellow mosaic viruses: genetically isolated begomoviruses.	summary: the yellow mosaic diseases of a number of legumes across southern asia are caused by four species of whitefly-transmitted geminiviruses (genus begomovirus, family geminiviridae): mungbean yellow mosaic virus, mungbean yellow mosaic india virus, dolichos yellow mosaic virus and horsegram yellow mosaic virus. they cause losses to a number of important pulse crops, a major source of dietary protein in the region. the viruses have host ranges limited to plants of the family fabaceae and eff ...	2007	20507504
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
some biological features of cotton whitefly, bemisia tabaci (homoptera: aleyrodidae) on various host plants.	development and reproduction of the cotton whitefly, bemisia tabaci (gennadius) were studied on aubergine, tomato and potato under laboratory conditions (30 degrees c and 55% rh). total life cycle from egg to adult was 14.9, 20.0 and 14.2 days on aubergine, tomato and potato, respectively. immature mortality were 12.9, 18.1 and 12.3% at the same three host plants. females of b. tabaci oviposited means of 51.8, 60.1 and 67.5 eggs on aubergine, tomato and potato, respectively and had a mean longev ...	2007	19090122
within-plant distribution of bemisia tabaci (homoptera: aleyrodidae) adults and immatures on greenhouse-grown winter cucumber plants.	within-plant distribution of adults, pupae, nymphs, and eggs of bemisia tabaci (gennadius) (homoptera: aleyrodidae) on leaves of greenhouse-grown winter cucumber, cucumis sativum l., plants were studied in field plots for integrated pest management decision making. distribution of specific life stages depended on the leaf positions. the leaves with most abundance and low or lowest variation of whiteflies were leaves 8-12 for adults, 8-11 for pupae, 6-12 for nymphs, and 6-9 for eggs. in light of ...	2007	17849865
evidence from molecular markers and population genetic analyses suggests recent invasions of the western north pacific region by biotypes b and q of bemisia tabaci (gennadius).	invasive events by bemisia tabaci (gennadius) biotypes in various parts of the world are of continuing interest. the most famous is biotype b that has caused great economic losses globally. in addition, biotype q has also recently been reported to be a new invasive pest. these two biotypes have been monitored for some time in the western north pacific region, but the invasive events and population genetic structures of these two biotypes are still not clear in this region. in this study, the mit ...	2007	17716487
assessment of herbivore performance on host plants.	two models for assessing the performance of herbivores on a variety of host plants are developed by combining knowledge of population genetics and population ecology, especially that of the fixation probability of mutant genes. the absolute host performance model precisely assesses host performance for one herbivore population based on parameters of fecundity, larval survivorship, and selection pressure. the relative host performance model compares host performance for one population among diffe ...	2007	17716460
[biology and non-preference for oviposition by bemisia tabaci (gennadius) biotype b (hemiptera: aleyrodidae) on cotton cultivars].	the purposes of this work were to evaluate some biological aspects of bemisia tabaci (gennadius) biotype b at egg and nymphal stages and to evaluate the non-preference for oviposition and its correlation with the number and type of trichomes on the cotton cultivars brs ipê, brs 186-precoce 3, brs acala, brs verde, brs-200 marrom, brs cedro, brs ita 90-2 and brs aroeira. the experiments were conducted in climatic chambers at 28 +/- 2 degrees c, 70% rh and photophase of 14h, and in greenhouse. egg ...	2007	17710328
introgression of resistance genes between populations: a model study of insecticide resistance in bemisia tabaci.	introgression is a key process in conservation biology, genetic modification of (crop) species and in the evolutionary ecology of many species. here we consider the case of introgression of insecticide resistance in the whitefly, bemisia tabaci. b. tabaci is a species complex consisting of a range of biotypes, known to have a high degree of inter-biotype reproductive isolation. in areas where insecticide resistant and susceptible biotypes of b. tabaci coexist, introgression of the resistance gen ...	2007	17658572
adult bemisia tabaci biotype b can induce silverleafing in squash.	bemisia tabaci biotype b is one of three genetic groups able to induce silverleafing in squash. several earlier studies had observed that this physiological change was induced only through the feeding of juvenile whiteflies. this study uses adult males only to show that after 11 days the adult males were able to begin to induce silverleafing. further, the response was density-dependent with 120 adults inducing the first signs of silverleafing in 11 days, 90 adults in 13 days and 60 adults in 15 ...	2007	17645825
global relationships of bemisia tabaci (hemiptera: aleyrodidae) revealed using bayesian analysis of mitochondrial coi dna sequences.	bemisia tabaci (gennadius) (hemiptera: aleyrodidae) is a species complex that is one of the most devastating agricultural pests worldwide and affects a broad range of food, fiber and ornamental crops. unfortunately, using parsimony and neighbor joining methods, global phylogenetic relationships of the major races/biotypes of b. tabaci remain unresolved. aside from the limitations of these methods, phylogenetic analyses have been limited to only small subsets of the global collection of b. tabaci ...	2007	17627853
potentiation/antagonism of pyrethroids with organophosphate insecticides in bemisia tabaci (homoptera: aleyrodidae).	the binary mixtures of pyrethroids cypermethrin, alpha-cypermethrin, zeta-cypermethrin, bifenthrin, fenpropathrin, lambda-cyhalothrin, and deltamethrin plus organophosphates ethion, profenofos, chlorpyrifos, quinalphos, acephate, methamidophos, methyl parathion, and triazophos were evaluated on putatively resistant field populations of bemisia tabaci (gennadius) (homoptera: aleyrodidae) from pakistan using a leaf-dip bioassay. ethion exhibited good potentiation with all the pyrethroids. quinalph ...	2007	17598552
reversal of resistance to pyriproxyfen in the q biotype of bemisia tabaci (hemiptera: aleyrodidae).	pyriproxyfen, a juvenile hormone (jh) mimic, is a biorational insecticide that disrupts insect development. it is one of the principal insecticides being used to control bemisia tabaci (gennadius) on cotton, and has many environmentally positive attributes that make it compatible with integrated pest management (ipm) programs. in israel, a high level of resistance to pyriproxyfen has been observed in several isolated regions. here, tests were conducted to establish whether temporal refuges from ...	2007	17582630
gene expression in pyriproxyfen-resistant bemisia tabaci q biotype.	pyriproxyfen is a biorational insecticide that acts as a juvenile hormone (jh) analogue and disrupts insect development with an unknown molecular mode of action. pyriproxyfen is one of the major insecticides used to control the whitefly bemisia tabaci (gennadius) and comply with integrated pest management (ipm) programmes, resulting in minimal effects on the environment, humans and beneficial organisms. during the last few years, resistance to pyriproxyfen has been observed in several locations ...	2007	17569108
tissue-specific gene silencing by rna interference in the whitefly bemisia tabaci (gennadius).	the hemipteran whitefly bemisia tabaci (gennadius) species complex and the plant viruses they transmit pose major constraints to vegetable and fiber production, worldwide. the whitefly tissue- and developmental-specific gene expression has not been exhaustively studied despite its economic importance. in 2002, a functional genomic project was initiated, which generated several thousands expressed sequence tags (ests) and their sequence. this project provides the basic information to design exper ...	2007	17550829
toxicity of insecticides to the sweetpotato whitefly (hemiptera: aleyrodidae) and its natural enemies.	efficient chemical control is achieved when insecticides are active against insect pests and safe to natural enemies. in this study, the toxicity of 17 insecticides to the sweetpotato whitefly, bemisia tabaci (gennadius), and the selectivity of seven insecticides to natural enemies of this insect pest were evaluated. to determine the insecticide toxicity, b. tabaci adults were exposed to abamectin, acephate, acetamiprid, cartap, imidacloprid, malathion, methamidophos, bifenthrin, cypermethrin, d ...	2007	17523144
effects of azadirachtin, abamectin, and spinosad on sweetpotato whitefly (homoptera: aleyrodidae) on tomato plants under laboratory and greenhouse conditions in the humid tropics.	direct and residual toxicity of neemazal-t/s (azadirachtin), success (spinosad), and abamectin was tested against different life stages of sweetpotato whitefly, bemisia tabaci (gennadius) (homoptera: aleyrodidae), under air-conditioned laboratory conditions and in a tropical net greenhouse. neemazal-t/s and abamectin deterred the settling of adults on tomato, lycopersicon esculentum mill (solanaceae), plants and consequently reduced egg deposition. no such effect was detected for success. all th ...	2007	17461066
[flight behaviors of bemisia tabaci and corresponding ipm strategies].	bemisia tabaci, a pest insect with stronger capabilities of flying and host plant-exploitation, is capable of flying 150 m high and over a distance as far as 7 km, but hardly flies higher than 0. 5 m and long distance in food-abundant areas. b. tabaci has the characteristics of both searching-and migrating flying, which enable it to exploit and locate on suitable hosts. up to now, no oogenesis-flight syndrome of b. tabaci has been detected. visual spectrum, air temperature and relative humidity, ...	2007	17450755
mitochondrial dna variability and development of a pcr diagnostic test for populations of the whitefly bemisia afer (priesner and hosny).	the whitefly, bemisia afer (hemiptera; aleyrodidae), is emerging as a major agricultural pest. the current identification methods based on adult and pupal morphology are laborious and unreliable. a diagnostic polymerase chain reaction (pcr) protocol was developed for the first time in this study to discriminate b. afer from other whitefly species. primers specific to mitochondrial cytochrome oxidase i gene (mtcoi) were designed to amplify a band of approx 650 bp. the pcr products were sequenced ...	2007	17401147
development of silverleaf assay, protein and nucleic acid-based diagnostic techniques for the quick and reliable detection and monitoring of biotype b of the whitefly, bemisia tabaci (gennadius).	the aim of this study was to develop and optimize silverleaf bioassay, esterase analysis and pcr-based techniques to distinguish quickly and reliably biotype b of the whitefly, bemisia tabaci (gennadius), from indian indigenous biotypes. zucchini and squash readily develop silverleaf symptoms upon feeding by the b biotype, but they are not readily available in indian markets. a local pumpkin variety 'big' was, therefore, used in silverleaf assay, which developed symptoms similar to those on zucc ...	2007	17916268
[insecticide resistance of bemisia tabaci field populations].	resistance to 13 insecticides in field populations of bemisia tabaci from six regions (fuzhou, zhangzhou, longyan, sanming, nanping, ningde) of fujian province, china was monitored by adult leaf-dipping bioassay. compared with the susceptible sud-s strain, all the six field populations exhibited high levels of resistance to lambda-cyhalothrin (838.38-2460.52 fold), fenpropathrin (244.64-834.29 fold), cypermethrin (116.02-266.35 fold), deltamethrin (81.75-124.18 fold), acephate (425.18-875.56 fol ...	2007	17886654
field evaluation of resistance to pyriproxyfen in bemisia tabaci (b biotype).	we determined effects of aerial sprays of the insect growth regulator pyriproxyfen on sweetpotato whitefly, bemisia tabaci (gennadius) (b biotype), in arizona cotton (gossypium spp.) fields. we measured survival for males and females from a susceptible strain and a laboratory-selected resistant strain, as well as for hybrid female progeny from crosses between the strains. insects were exposed directly to pyriproxyfen sprays in the field or indirectly in the laboratory by rearing them on sprayed ...	2007	17972644
critical feeding periods for last instar nymphal and pharate adults of the whiteflies, trialeurodes vaporariorum and bemisia tabaci.	a critical feeding period is the time after which 50% of a given species of insect can be removed from its food source and complete development by undergoing adult eclosion. the critical feeding period was determined for the greenhouse white fly, trialeurodes vaporariorum, and the sweet potato whitefly, bemisia tabaci (biotype b) (homptera/hemiptera: aleyrodidae). fourth (last) instar and pharate adult whiteflies were removed from green bean leaves, staged, placed on filter paper in small petri ...	2007	20302459
effects of host plants on insecticide susceptibility and carboxylesterase activity in bemisia tabaci biotype b and greenhouse whitefly, trialeurodes vaporariorum.	bemisia tabaci (gennadius) biotype b and the greenhouse whitefly, trialeurodes vaporariorum (westwood), have become serious pests of cotton and vegetable crops in china since the early 1990s. in recent years, however, b. tabaci have broken out more frequently and widely than have t. vaporariorum. the b. tabaci biotype b has also developed higher resistance to several insecticides. here, the effects of four different host plants on the insecticide susceptibility of b. tabaci biotype b and t. vapo ...	2007	17323411
toxicity and feeding deterrence of crude toxin extracts of lecanicillium (verticillium) lecanii (hyphomycetes) against sweet potato whitefly, bemisia tabaci (homoptera: aleyrodidae).	crude toxins [toxin(v3450) and toxin(vp28,) extracted from lecanicillium (verticillium) lecanii (zimmermann) gams & zare strain v3450 and vp28 respectively] were tested for contact toxicity, feeding deterrence and repellent activity against the sweet potato whitefly, bemisia tabaci (gennadius) (homoptera: aleyrodidae). both toxins showed ovicidal activity to eggs, with lc(50) values of 447 and 629 mg l(-1) respectively. nymphs of b. tabaci were the most susceptible stages (lc(50) values were cal ...	2007	17315271
efficacy of the entomopathogenic nematode, steinernema feltiae, against sweetpotato whitefly bemisia tabaci (homoptera: aleyrodidae) under laboratory and glasshouse conditions.	the potential of using the entomopathogenic nematode steinernema feltiae to control the sweetpotato whitefly bemisia tabaci (gennadius) has been established in previous laboratory studies. however, laboratory studies can overestimate the level of control achieved by biocontrol agents in the glasshouse. glasshouse trials are therefore required to confirm laboratory results before full-scale commercial development is considered. under both controlled laboratory and glasshouse conditions high morta ...	2007	17298677
ecdysteroids and juvenile hormones of whiteflies, important insect vectors for plant viruses.	ecdysteroids and juvenile hormones (jhs) regulate many physiological events throughout the insect life cycle, including molting, metamorphosis, ecdysis, diapause, reproduction, and behavior. fluctuation of whitefly ecdysteroid levels and the identity of the whitefly molting hormone (20-hydroxyecdysone) have only been reported within the last few years. an ecdysteroid commitment peak that is associated with the reprogramming of tissues for a metamorphic molt in many holometabolous and some hemime ...	2007	17258230
tropical whitefly ipm project.	the tropical whitefly ipm project (twfp) is an initiative of the systemwide ipm programme of the consultative group on international agricultural research (cgiar), financed by the department for international development (dfid) of the united kingdom, the danish international development agency (danida), the united states department of agriculture (usda) and agency for international development (usaid), the australian centre for international agricultural research (aciar), and the new zealand age ...	2007	17222696
[predation of axinoscymnus cardilobus to bemisia tabaci].	the laboratory study on the predation of axinoscymnus cardilobus to bemisia tabaci showed that the functional response of a. cardilobus to b. tabaci was of holling' s type ii. with the increasing age of b. tabaci, the searching rate of a. cardilobus adult decreased, and its handling time became longer. the searching rate of a. cardilobus larva was increased with its age, and the handling time became shorter. the mutual interference in individual predator could be described by hassell and varley ...	2006	17209395
bemnisia tabaci feeding induces pathogenesis-related proteins in cassava (manihot esculenta crantz).	cassava (manihot esculenta cranzts) plants fed upon by whitefly bemisia tabaci showed increased levels of pathogenesis-related (pr) proteins, such as beta-1, 3-glucanase, peroxidase and chitinase activities, as compared to uninfested plants. the enzymes increased in specific activities from 2 to 7 fold and protein content in leaf extracts decreased in whitefly-infested plants, compared to uninfested plants. among the three pr proteins, b. tabaci feeding induced significantly higher beta-1, 3-glu ...	2006	16967908
modeling evolution of resistance to pyriproxyfen by the sweetpotato whitefly (homoptera: aleyrodidae).	we used computer simulations to examine evolution of resistance to the insect growth regulator (igr) pyriproxyfen by the sweetpotato whitefly, bemisia tabaci (gennadius), biotype b [=bemisia argentifolii (bellows & perring)]. consistent with trends seen in cotton (gossipyium spp.) fields in arizona and israel, results suggest that evolution of resistance to pyriproxyfen may occur rapidly in this haplodiploid insect. similar to results from models of diploid insects, resistance evolved faster wit ...	2006	16937698
feeding preference of macrolophus caliginosus (heteroptera: miridae) on bemisia tabaci and trialeurodes vaporariorum (homoptera: aleyrodidae).	a study of predation choices of macrolophus caliginosus wagner (heteroptera: miridae) late instars and adults, when offered various developmental stages (eggs and nymphs) of the recently established whitefly bemisia tabaci (gennadius) (homoptera: aleyrodidae), was made based on two preference indices. in addition, prey choices of late instars when presented with three ratios of trialeurodes vaporariorum (westwood) (homoptera: aleyrodidae) and b. tabaci at a similar developmental stage (eggs, you ...	2006	16937666
within-plant distribution and sampling of single and mixed infestations of bemisia tabaci and trialeurodes vaporariorum (homoptera: aleyrodidae) in winter tomato crops.	in several areas of spain, the greenhouse whitefly, trialeurodes vaporariorum (westwood), and the sweet potato whitefly, bemisia tabaci (gennadius), coexist in tomato, lycopersicon esculentum miller. for integrated pest management decision-making, it is important to know the abundance of each species, because they exhibit different abilities to transmit viruses, are susceptible to different biological control agents, and have different responses to insecticides. this study was conducted to provi ...	2006	16686130
effect of pretreatment with piperonyl butoxide on pyrethroid efficacy against insecticide-resistant helicoverpa armigera (lepidoptera: noctuidae) and bemisia tabaci (sternorrhyncha: aleyrodidae).	pyrethroid resistance in b-type bemisia tabaci gennadius and australian helicoverpa armigera hübner field populations is primarily conferred by esterase isoenzymes which metabolise and sequester pyrethroid insecticides. it has been shown previously that pyrethroid resistance-associated esterases in h. armigera are inhibited by the insecticide synergist piperonyl butoxide (pbo) over a 22-h period. it is demonstrated here that similar inhibition can be obtained against b-type b. tabaci. small-scal ...	2006	16235269
buprofezin inhibits acetylcholinesterase activity in b-biotype bemisia tabaci.	b-biotype bemisia tabaci is a severe insect pest worldwide in many ornamental, agricultural, and horticultural industries. control of this insect is hampered by resistance to many acetylcholinesterase (ache)-inhibiting insecticides, such as organophosphates and carbamates. consequently, insect growth regulators such as buprofezin, which act by inhibiting chitin synthesis, are being investigated for use against b-biotype b. tabaci in australia. this study discusses the effects of buprofezin on b. ...	2006	17192620
previous and present diets of mite predators affect antipredator behaviour of whitefly prey.	predator diet is known to influence antipredator behaviour in prey. yet, it is not clear how antipredator behaviour is affected by diet changes of the predator. we studied the effect of previous and present diet of a predatory mite typhlodromips swirskii on the antipredator response of its prey, the whitefly bemisia tabaci. an earlier study showed that adult female whiteflies that had experienced predators, had learned to avoid ovipositing on plants with predators whose previous and present diet ...	2006	16596346
comparative study of the five biological parameters of cotton whitefly bemisia tabaci and silverleaf whitefly b. argentifolii bellows and perring reared on cotton under laboratory condition.	the five biological parameters of sweetpotato whitefly, bemisia tabaci (genn.) and silverleaf whitefly bemisia argentifolii bellows and perring (hom: aleyrodidae) as an important pest of cotton were compared on cotton in laboratory condition. the infested leaves containing nymphs and pupae were collected from cotton fields in iran. experiments were conducted in a growth chamber under 24+/-2 degrees c, 55+/-3% rh and 16:8 (l:d) photoperiod on cotton, gossypium hirsutum l. the newly emerged popula ...	2006	17385531
effect of zohar lq-215, a biorational surfactant, on the sweetpotato whitefly bemisia tabaci (biotype b).	zohar lq-215, a surfactant based on plant oils, able to control nymphs of the whitefly, bemisia tabaci (gennadius), under laboratory and field conditions. to evaluate the effects of the surfactant on the nymph stages of whitefly under laboratory conditions, potted cotton seedlings infested with 1st- or 3rd-instars were treated with the compound aqueous solutions. lc90 values of zohar lq-215 on 1st and 3rd-nymphs, based on mortality curves, were 0.78% and 1.14%, respectively. adult mortality of 1 ...	2006	17385496
response of the polyphagous whitefly bemisia tabaci b-biotype (hemiptera: aleyrodidae) to crop diversification - influence of multiple sensory stimuli on activity and fecundity.	a fundamental question concerning crop diversification is which mechanisms determine pest population size in polycultures compared to monocultures. it has been proposed that polyphagous insects experience a difficulty in decision-making when selecting food and oviposition sites in the presence of different host plants. this hypothesis was tested in the extremely polyphagous whitefly bemisia tabaci (gennadius) b-biotype, where behaviour (movement) and fecundity of females were compared in choice ...	2006	16441901
multiple origins of pyrethroid resistance in sympatric biotypes of bemisia tabaci (hemiptera: aleyrodidae).	the two most damaging biotypes of bemisia tabaci, b and q, are sympatric in the mediterranean basin and show high resistance to pyrethroids synergized by organophosphates. previous work showed that in the b biotype, this resistance is associated with the l925i mutation in the para-type voltage gated sodium channel. here we identified two mutations in the para-type voltage gated sodium channel associated with resistance to pyrethroids synergized by organophosphates in the q biotype: the l925i mut ...	2006	16360952
heterologous expression of the mi-1.2 gene from tomato confers resistance against nematodes but not aphids in eggplant.	the mi-1.2 gene in tomato (solanum lycopersicum) is a member of the nucleotide-binding leucine-rich repeat (nblrr) class of plant resistance genes, and confers resistance against root-knot nematodes (meloidogyne spp.), the potato aphid (macrosiphum euphorbiae), and the sweet potato whitefly (bemisia tabaci). mi-1.2 mediates a rapid local defensive response at the site of infection, although the signaling and defensive pathways required for resistance are largely unknown. in this study, eggplant ...	2006	16610741
sublethal effects of beauveria bassiana (balsamo) vuillemin (deuteromycotina: hyphomycetes) on the whitefly bemisia tabaci (gennadius) (hemiptera: aleyrodidae) under laboratory conditions.	sublethal effects were evaluated in subsequent generations of whiteflies bemisia tabaci (gennadius) arising from parental generations exposed in the four nymphal stages to the fungus beauveria bassiana (balsamo) vuillemin. examples of such effects include impaired fertility, production of malformations or external variations, and reduced survival of later generations. malformations of the head, legs, wings or abdomen were not observed in adults derived from treated nymphs, nor were negative effe ...	2006	17146585
pathogenicity of fusarium semitectum against crop pests and its biosafety to non-target organisms.	microbial control is receiving more attention, since these alternative tactics, compared to chemical control methods, are energy saving, non polluting, ecologically sound and sustainable. a mycopathogen, fusarium semitectum berk. and rav. (arsef 7233) was isolated from diseased cadavers of aphid (aphis gossypii) and cultured in saboraud maltose agar supplemented with yeast extract medium (smay). being isolated first time from the chilli ecosystem its potential was evaluated. experiments were con ...	2006	17385514
detection by rapd-pcr of polymorphism in populations of bemisia tabaci (genn.) collected on four host plants from iran.	the sweetpotato whitefly, bernisia tabaci (genn.) (hom: aleyrodidae) is a major pest of field crops, vegetables and ornamentals in iran. in this study, the infested leaves of cucumber (cucurnis sativus l.) zucchini (cucurbita pepo l.) eggplant (solanum melongena l.) and cotton (gossypium hirsutum l.) with whitefly nymphs and pupae were collected from iran, and were transferred to the laboratory. the newly emerged males and females of each population were released separately into a large cage set ...	2006	17385530
typing of tomato yellow leaf curl viruses and their vector in italy.	a molecular survey of tylcv/tylcsv and their associated vector bemisia tabaci, was performed during 2004-2005 in five regions of southern italy: i.e. sardinia (one locations), sicily (one location), calabria (three locations), campania (two locations) and basilicata (one location). a total of 71 tomato samples were checked for virus infection and for the presence of the vector. degenerate primers allowing the amplification of the coat protein gene of both tylcsv and tylcv isolates were designed. ...	2006	17390884
integrated management of tylcv/tylcsv on greenhouse hydroponic tomatoes in southern italy.	tomato yellow leaf curl (tylc) caused by tomato yellow leaf curl virus (tylcv) and tomato yellow leaf curl sardinia virus (tylcsv), vectored by the whitefly bemisia tabaci, is a major disease of tomato in sardinia and sicily, and is becoming a serious threat in southern italy too. tylcsv was first reported in calabria region in 1991, but apparently it was an occasional outbreak, and b. tabaci was not detected. later, during the 2003-2004 winter, a serious epidemic was observed in protected tomat ...	2006	17390886
[spatial patterns of bemisia tabaci (gennadius) population in cotton fields].	field investigations on the vertical and horizontal distribution patterns of bemisia tabaci (gennadius) population on bt cotton guokang no. 22 and non-bt cotton simian no. 3 showed that in july, no obvious difference was found in the vertical distribution of b. tabaci population on cotton plant, but in august, the population density was significantly higher on the upper part of cotton plant than on its middle and lower parts. the horizontal distribution patterns of b. tabaci adult and nymph were ...	2006	17044499
effect of cotton cultivar on performance of aphis gossypii (homoptera: aphididae) in iran.	cotton aphids, aphis gossypii glover (homoptera: aphididae), obtained from cotton, gossypium hirsutum l., fields in the gorgan region of northern iran, were colonized on 'varamin' cotton plants in a growth chamber. the development, survivorship, and life table parameters of the cotton aphid were evaluated at 27.5 +/- 1 degrees c, 65 +/- 10% rh, and aphotoperiod of 14:10 (l:d) h of artificial light on five commonly growing cotton cultivars: varamin, 'sealand' (relatively resistant cultivar), 'bak ...	2006	17066818
identification and localization of a rickettsia sp. in bemisia tabaci (homoptera: aleyrodidae).	whiteflies (homoptera: aleyrodidae) are sap-sucking insects that harbor "candidatus portiera aleyrodidarum," an obligatory symbiotic bacterium which is housed in a special organ called the bacteriome. these insects are also home for a diverse facultative microbial community which may include hamiltonella, arsenophonus, fritchea, wolbachia, and cardinium spp. in this study, the bacteria associated with a b biotype of the sweet potato whitefly bemisia tabaci were characterized using molecular fing ...	2006	16672513
microsatellites reveal extensive geographical, ecological and genetic contacts between invasive and indigenous whitefly biotypes in an insular environment.	human-mediated bioinvasions provide the opportunity to study the early stages of contact between formerly allopatric, divergent populations of a species. however, when invasive and resident populations are morphologically similar, it may be very difficult to assess their distribution in the field, as well as the extent of ecological overlap and genetic exchanges between invasive and resident populations. we here illustrate the use of data obtained from a set of eight microsatellite markers toget ...	2006	16709274
bemisia tabaci transmission of specific lettuce infectious yellows virus genotypes derived from in vitro synthesized transcript-inoculated protoplasts.	bemisia tabaci transmission was demonstrated for virions derived from cloned infectious cdnas of lettuce infectious yellows virus (liyv). rna transcripts synthesized from the cdna clone of liyv rna 1 and for clones of seven genotypes (pr6, p1-1a, p1-2b, p1-2f, p1-4h, p1-5b, and p1-5d) of liyv rna 2 produced virions or virion-like particles (vlps) when inoculated to tobacco protoplasts. pr6, p1-1a, and p1-2f virions were transmissible to plants by b. tabaci and transmission frequencies ranged fro ...	2006	16750548
mi-1-mediated aphid resistance involves salicylic acid and mitogen-activated protein kinase signaling cascades.	the tomato mi-1 gene confers resistance to root-knot nematodes (meloidogyne spp.), potato aphids (macrosiphum eluphorbiae), and whiteflies (bemisia tabaci and b. tabaci biotype b). resistance to potato aphid is developmentally regulated and is not associated with induction of a hypersensitive response. the nahg transgene that eliminates endogenous salicylic acid (sa) was used to test the role of the sa signaling pathway in the resistance mediated by mi-1 to potato aphids. aphids survived longer ...	2006	16776299
post-transcriptional gene silencing in controlling viruses of the tomato yellow leaf curl virus complex.	tomato yellow leaf curl disease (tylcd) is caused by a group of geminiviruses that belong to the tomato yellow leaf curl virus (tylcv) complex and are transmitted by the whitefly (bemisia tabaci genn.). the disease causes great yield losses in many countries throughout the mediterranean region and the middle east. in this study, the efficacy of post-transcriptional gene silencing (ptgs) to control the disease caused by tylcv complex was investigated. non-coding conserved regions from the genome ...	2006	16862387
effectiveness of two insect growth regulators against bemisia tabaci (gennadius) (homoptera: aleyrodidae) and helicoverpa armigera (hübner) (lepidoptera: noctuidae) and their impact on population densities of arthropod predators in cotton in pakistan.	field efficacies of two insect growth regulators (igrs) at two recommended application rates, buprofezin at 370 and 555 g ai ha(-1) and lufenuron at 37 and 49 g ai ha(-1), were determined against the sweet potato whitefly, bemisia tabaci (gennadius), and the cotton bollworm, helicoverpa armigera (hübner), in experimental plots of cotton at the directorate of cotton research, faisalabad, pakistan. adverse effects of the igrs on populations of associated arthropod predators, namely geocorids, chry ...	2006	16862616
closely related wolbachia strains within the pumpkin arthropod community and the potential for horizontal transmission via the plant.	phylogenetic studies have implicated frequent horizontal transmission of wolbachia among arthropod host lineages. however, the ecological routes for such lateral transfer are poorly known. we surveyed the species of two arthropod communities, one on pumpkin and the other on loofah plants, for wolbachia, constructed wsp gene phylogenies of those wolbachia strains found to infect community members, and established ecological links among infected members. four taxonomically diverse insects in the p ...	2006	16598632
whitefly (bemisia tabaci) genome project: analysis of sequenced clones from egg, instar, and adult (viruliferous and non-viruliferous) cdna libraries.	the past three decades have witnessed a dramatic increase in interest in the whitefly bemisia tabaci, owing to its nature as a taxonomically cryptic species, the damage it causes to a large number of herbaceous plants because of its specialized feeding in the phloem, and to its ability to serve as a vector of plant viruses. among the most important plant viruses to be transmitted by b. tabaci are those in the genus begomovirus (family, geminiviridae). surprisingly, little is known about the geno ...	2006	16608516
comparative study on biological parameters of bemisia tabaci (genn.) collected on four host plants from varamin-iran.	during 2003 biological parameters of sweetpotato whitefly, b. tabaci (genn.) (horn. aleyrodidae) as a major pest of field crops, vegetables and ornamentals were studied. in this study, the infested leaves of cucumber (cucumis sativus l.) zucchini (cucurbita pepo l.) eggplant (solanum melongena l.) and cotton (gossypium hirsutum l.) with whitefly nymphs and pupae were collected from varamin-iran, and were transferred to the laboratory. the newly emerged males and females of each population were r ...	2005	16628901
the x-ray structure of a hemipteran ecdysone receptor ligand-binding domain: comparison with a lepidopteran ecdysone receptor ligand-binding domain and implications for insecticide design.	the ecdysone receptor is a hormone-dependent transcription factor that plays a central role in regulating the expression of vast networks of genes during development and reproduction in the phylum arthropoda. the functional receptor is a heterodimer of the two nuclear receptor proteins ecdysone receptor (ecr) and ultraspiracle protein. the receptor is the target of the environmentally friendly bisacylhydrazine insecticides, which are effective against lepidoptera but not against hemiptera or sev ...	2005	15809296
differential transcriptional activity of plant-pathogenic begomoviruses in their whitefly vector (bemisia tabaci, gennadius: hemiptera aleyrodidae).	plant-pathogenic begomoviruses have a complex association with their whitefly vector and aspects concerning virus genetic activity (genome replication and gene transcription) within the insect remain highly controversial. virus transcript abundance was assessed by quantifying selected gene transcripts of tomato mottle virus (tomov, a new world bipartite begomovirus) and tomato yellow leaf curl virus (tylcv, an old world monopartite begomovirus) in whiteflies (bemisia tabaci biotype b) after feed ...	2005	15831966
south west indian ocean islands tomato begomovirus populations represent a new major monopartite begomovirus group.	biological and molecular properties of tomato leaf curl madagascar virus isolates from morondova and toliary (tolcmgv-[tol], -[mor]), tomato leaf curl mayotte virus isolates from dembeni and kahani (tolcytv-[dem], -[kah]) and a tomato yellow leaf curl virus isolate from reunion (tylcv-mld[re]) were determined. full-length dna components of the five isolates from madagascar, mayotte and reunion were cloned and sequenced and, with the exception of tolcmgv-[tol], were shown to be both infectious in ...	2005	15831967
whitefly bemisia tabaci (homoptera: aleyrodidae) infestation on cassava genotypes grown at different ecozones in nigeria.	large-scale screening of cassava, manihot esculenta crantz, genotypes for resistance to infestation by whitefly bemisia tabaci gennadius, the vector of cassava mosaic geminiviruses, is limited. a range of new cassava elite clones were therefore assessed for the whitefly infestation in the 1999/2000 and 2000/2001 cropping seasons in experimental fields of international institute of tropical agriculture, ibadan, nigeria. on each scoring day, between 0600 and 0800 hours when the whiteflies were rel ...	2005	15889755
novel chlamydiae in whiteflies and scale insects: endosymbionts 'candidatus fritschea bemisiae' strain falk and 'candidatus fritschea eriococci' strain elm.	bacteria called 'fritschea' are endosymbionts of the plant-feeding whitefly bemisia tabaci and scale insect eriococcus spurius. in the gut of b. tabaci, these bacteria live within bacteriocyte cells that are transmitted directly from the parent to oocytes. whiteflies cause serious economic damage to many agricultural crops; b. tabaci fecundity and host range are less than those of bemisia argentifolii, possibly due to the presence of this endosymbiont. the b. tabaci endosymbiont has been charact ...	2005	16014485
nuclear dna content of the whitefly bemisia tabaci (aleyrodidae: hemiptera) estimated by flow cytometry.	the nuclear dna content of the whitefly bemisia tabaci (gennnadius) was estimated using flow cytometry. male and female nuclei were stained with propidium iodide and their dna content was estimated using chicken red blood cells and arabidopsis thaliana l. (brassicaceae) as external standards. the estimated nuclear dna content of male and female b. tabaci was 1.04 and 2.06 pg, respectively. these results corroborated previous reports based on chromosome counting, which showed that b. tabaci males ...	2005	16048678
the expression of the hydroxyproline-rich glycopeptide systemin precursor a in response to (a)biotic stress and elicitors is indicative of its role in the regulation of the wound response in tobacco (nicotiana tabacum l.).	two hydroxyproline-rich glycopeptide systemin (tobhs) precursor proteins known as preprotobhypsys-a and b were recently discovered in tobacco (nicotiana tabacum l.) [pearce et al. in nature 411:817-820, 2001]. in this work, the effect of elicitors, insect damage, and abiotic stress on the expression of preprotobhypsys-a pptobhs-a) in tobacco plants was evaluated. foliar application of methyl jasmonate preferentially induced the systemic expression of pptobhs-a in leaves phyllotactically one posi ...	2005	16052320
acute oral intragastric pathogenicity and toxicity in mice of paecilomyces fumosoroseus isolated from whiteflies.	paecilomyces fumosoroseus, monospore culture eh-506/3, isolated in mexico from bemisia tabaci whitefly was tested for acute oral intragastric pathogenicity and toxicity in cd-1 mice. animals were inoculated by gavage with only one dose (10(8) conidia/animal) of viable (72 mice), heat-killed (24 mice) fungus and compared to 18 control mice. clinical observations were done daily; mycological and histological tests were performed during necropsies at days 3, 10, 17, and 21 after the inoculation. no ...	2005	16096686
toxicity of sucrose octanoate to egg, nymphal, and adult bemisia tabaci (hemiptera: aleyrodidae) using a novel plant-based bioassay.	the sweetpotato whitefly, bemisia tabaci (gennadius), b biotype, presents a unique problem for vegetable growers by serving as a vector of plant viruses and by inducing physiological disorders of leaves and fruit. an action threshold of a single whitefly is necessary because of the threat of disease in many areas and growers rely heavily on a single class of insecticides (neonicotinoids) for whitefly control. additional control methods are needed to manage this pest in commercial vegetables. ext ...	2005	16156577
genetic structure of the whitefly bemisia tabaci in the asia-pacific region revealed using microsatellite markers.	bemisia tabaci (hemiptera: aleyrodidae) is a haplo-diploid species of sap-feeding insect belonging to the group of insects commonly known as whiteflies. from earlier analyses of mitochondrial and ribosomal markers it has been concluded that in the asia-pacific region there were three major indigenous races as well as a large collection of genotypes with no clear association with any race. this new study uses 15 microsatellite loci and demonstrates that the indigenous asia-pacific genotypes can b ...	2005	16202090
host-parasite interactions between whiteflies and their parasitoids.	there is relatively little information available concerning the physiological and biochemical interactions between whiteflies and their parasitoids. in this report, we describe interactions between aphelinid parasitoids and their aleyrodid hosts that we have observed in four host-parasite systems: bemisia tabaci/encarsia formosa, trialeurodes vaporariorum/e. formosa, b. tabaci/eretmocerus mundus, and t. lauri/encarsia scapeata. in the absence of reported polydnavirus and teratocytes, these paras ...	2005	16304614
assessment of cross-resistance potential to neonicotinoid insecticides in bemisia tabaci (hemiptera: aleyrodidae).	laboratory bioassays were carried out with four neonicotinoid insecticides on multiple strains of bemisia tabaci (gennadius) to evaluate resistance and cross-resistance patterns. three imidacloprid-resistant strains and field populations from three different locations in the southwestern usa were compared in systemic uptake bioassays with acetamiprid, dinotefuran, imidacloprid and thiamethoxam. an imidacloprid-resistant strain (im-r) with 120-fold resistance originally collected from imperial va ...	2005	16336702
dna markers for identifying biotypes b and q of bemisia tabaci (hemiptera: aleyrodidae) and studying population dynamics.	the two most widespread biotypes of bemisia tabaci (gennadius) in southern europe and the middle east are referred to as the b and q-type, which are morphologically indistinguishable. in this study various dna markers have been developed, applied and compared for studying genetic diversity and distribution of the two biotypes. for developing sequence characterized amplified regions (scar) and cleaved amplified polymorphic sequences (caps) techniques, single random amplified polymorphic dna (rapd ...	2005	16336708
the broadly insecticidal photorhabdus luminescens toxin complex a (tca): activity against the colorado potato beetle, leptinotarsa decemlineata, and sweet potato whitefly, bemisia tabaci.	toxin complex a (tca), a high molecular weight insecticidal protein complex produced by the entomopathogenic bacterium photorhabdus luminescens, has been found to be orally toxic to both the colorado potato beetle, leptinotarsa decemlineata, and the sweet potato whitefly, bemisia tabaci biotype b. the 48 hour lc50 for tca against neonate l. decemlineata was found to be 2.7 ppm, and the growth of 2nd instar l. decemlineata exposed to tca for 72 hours was almost entirely inhibited at concentration ...	2005	17119614
a new silverleaf-inducing biotype ms of bemisia tabaci (hemiptera: aleyrodidae) indigenous to the islands of the south-west indian ocean.	following the first detection of tomato yellow leaf curl virus (tylcv) from reunion (700 km east of madagascar) in 1997 and the upsurge of bemisia tabaci (gennadius) on vegetable crops, two genetic types of b. tabaci were distinguished using rapd-pcr and cytochrome oxidase i (coi) gene sequence comparisons. one type was assigned to biotype b and the other was genetically dissimilar to the populations described elsewhere and was named ms, after the mascarenes archipelago. this new genetic type fo ...	2005	15705212
insecticide resistance in bemisia tabaci (homoptera: aleyrodidae) populations from crete.	the resistance levels to alpha-cypermethrin, bifenthrin, pirimiphos-methyl, endosulfan and imidacloprid were determined in bemisia tabaci (gennadius) from crete. five b tabaci populations collected from greenhouse and outdoor crops were bioassayed and compared with a reference susceptible strain. bemisia tabaci collected in a floriculture greenhouse exhibited the highest resistance against all insecticides: at lc50, resistance factors were 23-fold for bifenthrin, 80-fold for alpha-cypermethrin, ...	2005	15712366
molecular cloning of coat protein gene of an indian cotton leaf curl virus (clcuv-hs2) isolate and its phylogenetic relationship with others members of geminiviridae.	cotton leaf curl geminivirus is a whitefly (bemisia tabaci genn.) transmitted begomovirus (family geminiviridae) causing a serious disease of cotton in northern india. the very typical symptoms of present isolate (clcuv-hs2) showed thickened veins, dark green discoloration of the leaves with upward curling and leaf like structure known as enation (one in number), which develops into cup-shaped on the reverse side of leaves. the polymerase chain reaction (pcr) based technique can detect the viral ...	2005	15744566
biotypes b and q of bemisia tabaci and their relevance to neonicotinoid and pyriproxyfen resistance.	resistance monitoring for bemisia tabaci field populations to the juvenile hormone mimic, pyriproxyfen, was conducted from 1996 to 2003 in commercial cotton fields in two areas of israel: the ayalon valley (central israel) and the carmel coast (northwestern israel). although the use of pyriproxyfen ceased in these areas in 1996-1997 (because of the resistance), resistance levels to pyriproxyfen declined to some extent in the fields but remained quite stable, and the susceptibility has not been t ...	2005	15756703