| identification of a whitefly species by genomic and behavioral studies. | an introduced whitefly species, responsible for over a half billion dollars in damage to u.s. agricultural production in 1991, is morphologically indistinguishable from bemisia tabaci (gennadius). however, with the use of polymerase chain reaction-based dna differentiation tests, allozymic frequency analyses, crossing experiments, and mating behavior studies, the introduced whitefly is found to be a distinct species. recognition of this new species, the silverleaf whitefly, is critical in the se ... | 1993 | 8418497 |
| pathogenicity of the entomopathogenic fungi paecilomyces spp. and beauveria bassiana against the silverleaf whitefly, bemisia argentifolii. | pathogenicities of three species of entomopathogenic fungi against preimaginal bemisia argentifolii were measured and compared. third-instar nymphs on excised leaves of hibiscus rosa-sinensis were exposed to spray applications of 14 isolates of beauveria bassiana, 22 isolates of paecilomyces fumosoroseus, and five isolates of paecilomyces farinosus. b. bassiana and p. fumosoroseus isolates of diverse origins were highly pathogenic to the whitefly nymphs; median lethal doses of 14 of the 22 p. fu ... | 1998 | 9538026 |
| effect of low viability on infectivity of beauveria bassiana conidia toward the silverleaf whitefly. | | 2000 | 11023752 |
| effects of exogenous nutrients on conidial germination and virulence against the silverleaf whitefly for two hyphomycetes. | exogenous protein and sugar sources were tested for their impact on conidial germination of two silverleaf whitefly (bemisia argentifolii) pathogens: beauveria bassiana and paecilomyces fumosoroseus. in liquid culture, sugars stimulated only 5-27% germination of b. bassiana and < or =11% germination of p. fumosoroseus, whereas, yeast extract or peptone stimulated 95-100% germination. in the absence of additional nutrients, agar alone stimulated approximately 50% germination. storing spores for d ... | 2001 | 11273689 |
| antagonism between beauveria bassiana and imidacloprid when combined for bemisia argentifolii (homoptera: aleyrodidae) control. | imidacloprid and the entomopathogenic fungus beauveria bassiana (balsamo) vuillemin are both used to control the whitefly bemisia argentifolii bellows & perring. we tested whether the two control strategies acted additively, synergistically, or antagonistically when combined for whitefly control. we found antagonism in that b. bassiana inhibited the effectiveness of imidacloprid. when b. bassiana was combined with imidacloprid, insect response was either less than or similar to (depending on b. ... | 2001 | 11332825 |
| host plant effects on activity of the mitosporic fungi beauveria bassiana and paecilomyces fumosoroseus against two populations of bemisia whiteflies (homoptera: aleyrodidae). | laboratory bioassays were conducted to determine the effect of host plant on mycosis in two geographically distinct populations of early 2nd-instar nymphs of bemisia argentifolii bellows & perring from the entomopathogenic fungi beauveria bassiana (balsamo) vuillemin and paecilomyces fumosoroseus (wize) brown & smith. mycosis in b. argentifolii nymphs varied according to the host plant on which the nymphs were reared but not according to the population. both populations of whiteflies reared on c ... | 2001 | 11502058 |
| cuticular lipids and silverleaf whitefly stage affect conidial germination of beauveria bassiana and paecilomyces fumosoroseus. | beauveria bassiana and paecilomyces fumosoroseus are generalist entomopathogenic fungi that infect the silverleaf whitefly (bemisia argentifolii). we found second and third instar whiteflies to be the most susceptible larval stage to both fungi. conidia of b. bassiana germinated most readily on the cuticle of second instars (54% germinated) and p. fumosoroseus germination was highest on third instar cuticle (45%). fourth instars (the ultimate instar) had low susceptibility to these pathogens, an ... | 2003 | 14615214 |
| a comparison of alternative plant mixes for conservation bio-control by native beneficial arthropods in vegetable cropping systems in queensland australia. | cucurbit crops host a range of serious sap-sucking insect pests, including silverleaf whitefly (slw) and aphids, which potentially represent considerable risk to the australian horticulture industry. these pests are extremely polyphagous with a wide host range. chemical control is made difficult due to resistance and pollution, and other side-effects are associated with insecticide use. consequently, there is much interest in maximising the role of biological control in the management of these s ... | 2010 | 19323854 |
| control of silverleaf whitefly, cotton aphid and kanzawa spider mite with oil and extracts from seeds of sugar apple. | development of alternative methods for pest management is needed with the increased concern for adverse effects of pesticides for human health and the environment. the main goal of our study was to test the oil from seeds of sugar apple (annona squamosa), an edible tropical fruit for pest control. the oil pressed out of seeds was as effective in controlling the silverleaf whitefly, bemisia argentifolii bellows & perring (homoptera: aleyrodidae), infesting leaves of tomato plants in greenhouse co ... | 2009 | 19768275 |
| Infection by Mycorrhizal Fungi Increases Natural Enemy Abundance on Tobacco (Nicotiana rustica). | The presence of arbuscular mycorrhizal fungi (AMF) influences plant nutrient uptake, growth, and plant defensive chemistry, thereby directly influencing multi-trophic interactions. Different fungal isolates (genotypes of the same fungal species) have been shown to differ in nutrient uptake ability. Plants infected with different AMF genotypes may vary in foliar nutrient or defensive chemical levels, potentially influencing multi-trophic interactions. Using a completely randomized design, we com ... | 2011 | 22182609 |
| 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 |
| polyol specificity of recombinant arabidopsis thaliana sorbitol dehydrogenase studied by enzyme kinetics and in silico modeling. | polyols are enzymatically-produced plant compounds which can act as compatible solutes during periods of abiotic stress. nicotinamide adenine dinucleotide(+)-dependent sorbitol dehydrogenase (sdh, e. c. 1.1.1.14) from arabidopsis thaliana l. sorbitol dehydrogenase (atsdh) is capable of oxidizing several polyols including sorbitol, ribitol, and xylitol. in the present study, enzymatic assays using recombinant atsdh demonstrated a higher specificity constant for xylitol compared to sorbitol and ri ... | 2015 | 25755662 |
| liquid culture fermentation for rapid production of desiccation tolerant blastospores of beauveria bassiana and isaria fumosorosea strains. | a major constraint to the commercial use of fungal biocontrol agents is the availability of low-cost production media and processes. previous attempts in producing beauveria blastospores using liquid culture fermentation processes required long fermentation times (6-8days) and produced cells that had poor survival after desiccation and storage. in this study, isolates of beauveria bassiana and isaria fumosorosea were evaluated for blastospore yield, desiccation tolerance, storage stability, and ... | 2015 | 25497914 |
| germination of conidia and blastospores of paecilomyces fumosoroseus on the cuticle of the silverleaf whitefly, bemisia argentifolii. | | 1999 | 16308757 |
| combining azadirachtin and paecilomyces fumosoroseus (deuteromycotina: hyphomycetes) to control bemisia argentifolii (homoptera: aleyrodidae). | both azadirachtin and paecilomyces fumosoroseus (wize) brown & smith have been used to control the whitefly bemisia argentifolii bellows & perring, but with only moderate effectiveness. azadirachtin is a botanical insecticide derived from the neem tree, and p. fumosoroseus is an entomopathogenic fungus. to test whether these two agents might be more effective for whitefly control if used together, different rates of each were combined in laboratory bioassays in factorial treatment. both tank mix ... | 2003 | 12650340 |
| performance of bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) on weeds. | bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) is regarded as a pest with a large number of hosts, including crops and weeds. the performance of this whitefly on seven weeds was evaluated in order to identify the most suitable host. the following weeds that are very common in intense agricultural areas in the state of são paulo, brazil, were selected for this study: spurge (euphorbia heterophylla), beggarticks (bidens pilosa), red tasselflower (emilia sonchifolia), small-flower galins ... | 2014 | 27194066 |
| survey of indigenous entomopathogenic fungi and evaluation of their pathogenicity against the carmine spider mite, tetranychus cinnabarinus (boisd.), and the whitefly, bemisia tabaci (genn.) biotype b. | the carmine spider mite, tetranychus cinnabarinus, and the silverleaf whitefly, bemisia tabaci, are serious pests of both field- and greenhouse-grown crops in south-western turkey. control of these pests has been heavily dependent upon chemical pesticides. the objectives of this study were to investigate the occurrence of indigenous entomopathogenic fungi (epf) in field populations of t. cinnabarinus and b. tabaci, and to evaluate their pathogenicity against these pests. for this purpose, a surv ... | 2016 | 26929052 |
| mechanisms relevant to the enhanced virulence of a dihydroxynaphthalene-melanin metabolically engineered entomopathogen. | the entomopathogenic fungus metarhizium anisopliae ma05-169 is a transformant strain that has been metabolically engineered to express dihydroxynaphthalene-melanin biosynthesis genes. in contrast to the wild type strain, the transformant displays a greater resistance to environmental stress and a higher virulence toward target insect host. however, the underlying mechanisms for these characteristics remain unclear; hence experiments were initiated to explore the possible mechanism(s) through phy ... | 2014 | 24662974 |
| 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 |
| local and systemic changes in squash gene expression in response to silverleaf whitefly feeding. | squash genes (slw1 and slw3) induced systemically after silverleaf whitefly feeding were identified. differences in the local and systemic expression of slw1 and slw3 after feeding by the closely related silverleaf and sweetpotato whiteflies were observed. temporal and spatial studies showed that slw1 and slw3 were induced when second, third, and fourth nymphal instars were feeding. although only barely detected after wounding and bacterial infection, slw1 and slw3 rnas were abundant during wate ... | 2000 | 10948259 |
| 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 |
| ecdysteroid ligand-receptor selectivity--exploring trends to design orthogonal gene switches. | a set of thirty-two natural and ten semisynthetic ecdysteroids was assayed in murine 3t3 cells across ten different ecdysteroid receptor (ecr) ligand-binding domains derived from nine arthropod species in an engineered gene switch format. among the ecdysteroids tested, the most biologically widespread ecdysteroid, 20-hydroxyecdysone (20e), was moderately and consistently potent across the tested ecrs. the most potent ligand-receptor combination (ec(50) = 0.3 nm) was ponasterone a (poa) actuating ... | 2008 | 19021756 |
| [biological aspects of bemisia tabaci (genn.) b biotype (hemiptera: aleyrodidae) on six bean genotypes]. | the silverleaf whitefly is one of the most harmful pests that attack bean crops, mainly for extracting large quantities of phloem sap and transmitting the bean golden mosaic virus. resistant germoplasm plants can be an important method for controlling this pest. the biological aspects of bemisia tabaci b biotype on bean (phaseolus vulgaris) genotypes were evaluated. the tests were conducted under laboratory conditions, with the following genotypes: arc 1, arc 3s, arc 5s, g13028, g11056 and porri ... | 2008 | 18506300 |
| 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 |
| age-specific interaction between the parasitoid, encarsia formosa and its host, the silverleaf whitefly, bemisia tabaci (strain b). | the effect of hostage, the instar of bemisia tabaci (gennadius) parasitized, on the growth and development of encarsia formosa (gahan) was studied. e. formosa was able to parasitize and complete its life cycle no matter which instar of b. tabaci (strain b), [also identified as b. argentifolii (bellows and perring)], was provided for oviposition, but parasitoid development was significantly slower when 1st or 2nd instar b. tabaci rather than 3rd or 4th instars were parasitized. host age influence ... | 2003 | 15841244 |
| distinct sucrose isomerases catalyze trehalulose synthesis in whiteflies, bemisia argentifolii, and erwinia rhapontici. | isomaltulose [alpha-d-glucopyranosyl-(1,6)-d-fructofuranose] and trehalulose [alpha-d-glucopyranosyl-(1,1)-d-fructofuranose] are commercially valuable sucrose-substitutes that are produced in several microorganisms by the pali gene product, a sucrose isomerase. trehalulose also occurs in the silverleaf whitefly, bemisia argentifoli, as the major carbohydrate in the insect's honeydew. to determine if the enzyme that synthesizes trehalulose in whiteflies was similar to the well-characterized sucro ... | 2003 | 12798947 |
| multitrophic interactions of the silverleaf whitefly, host plants, competing herbivores, and phytopathogens. | our laboratory found that silverleaf whitefly (slw; bemisia argentifolii bellows & perring) feeding alters host plant physiology and chemistry. the slw induces a number of host plant defenses, including pathogenesis-related (pr) protein accumulation (e.g., chitinases, beta-1,3-glucanases, peroxidases, chitosanases, etc.). induction of the pr proteins by slw feeding occurs in various plant species and varieties. the extent and type of induction is dependent on a number of factors that include hos ... | 2002 | 12432517 |
| pathogenicity of aschersonia spp. against whiteflies bemisia argentifolii and trialeurodes vaporariorum. | entomopathogenic fungi of the genus aschersonia are specific for whitefly and scale insects. they can be used as biological control agents against silverleaf whitefly, bemisia argentifolii and greenhouse whitefly, trialeurodes vaporariorum. forty-four isolates of aschersonia spp. were tested for their ability to sporulate and germinate on semi-artificial media and to infect insect hosts. seven isolates sporulated poorly (less than 1x10(7) conidia/dry weight) and 10 were not able to infect either ... | 2002 | 12417207 |
| discovering new insect viruses: whitefly iridovirus (homoptera: aleyrodidae: bemisia tabaci). | adult whiteflies, bemisia tabaci (gennadius), collected from the field were screened for viral pathogens using a cell line from the silverleaf whitefly, b. tabaci, b biotype (syn. b. argentifolii). homogenates from the field-collected whiteflies were applied to cell cultures and checked for cytopathic effects (cpe). cells were observed to develop cytoplasmic inclusions and to have a change in morphology. cells displaying cpe were observed using a transmission electron microscope and found to be ... | 2001 | 12009803 |
| effects of in vitro passage of beauveria bassiana on virulence to bemisia argentifolii. | | 2001 | 11437531 |
| use of cc traps with different trap base colors for silverleaf whiteflies (homoptera: aleyrodidae), thrips (thysanoptera: thripidae), and leafhoppers (homoptera: cicadellidae). | during 1996, 1997, and 1999, studies were conducted in cotton, sugar beets, alfalfa, yardlong bean, and peanut fields to compare insect catches in cc traps equipped with different trap base colors. the studies were conducted in southwestern united states, china, and india. the nine colors, white, rum, red, yellow, lime green, spring green, woodland green (dark green), true blue, and black, varied in spectral reflectance in the visible (400-700 nm) and near-infrared (700-1050 nm) portions of spec ... | 2000 | 10985050 |
| imidacloprid applications by subirrigation for control of silverleaf whitefly (homoptera: aleyrodidae) on poinsettia. | the objective of this study was to determine whether silverleaf whiteflies, bemisia argentifolii bellows & perring, on poinsettia, euphorbia pulcherrima willdenow ex klotsch, can be controlled with imidacloprid applied by subirrigation. different amounts of imidacloprid uptake by the growing medium were obtained by not watering the subirrigated plants for 0, 1, 2, or 4 d before the imidacloprid application. these treatments resulted in absorption of 12-175 ml of imidacloprid solution by the grow ... | 2000 | 10902335 |
| effect of silver reflective mulch and a summer squash trap crop on densities of immature bemisia argentifolii (homoptera: aleyrodidae) on organic bean. | polyethylene mulch with a reflective silver stripe and a yellow summer squash, cucurbita pepo l., trap crop were tested alone and in combination as tactics to reduce densities of bemisia argentifolii bellows & perring eggs and nymphs, and incidence of bean golden mosaic geminivirus on snap bean, phaseolus vulgaris l. egg densities were consistently higher on squash than on bean, but egg densities and virus incidence were not lower on bean grown with squash than on bean grown in monoculture. silv ... | 2000 | 10902322 |
| an economic comparison of biological and conventional control strategies for whiteflies (homoptera: aleyrodidae) in greenhouse poinsettias. | the objective of this study was to evaluate the costs of biologically controlling infestations of silverleaf whitefly, bemisia argentifolii bellows & perring, in new england greenhouse operations on poinsettia, euphorbia pulcherrima wild, ex koltz, using the parasitic wasp encarsia formosa gahan (nile delta strain). partial budget analysis was used to compare costs for conventional verses biological control regimens. four alternative whitefly control budgets are developed; two conventional chemi ... | 2000 | 10902307 |
| molecular basis for thermoprotection in bemisia: structural differences between whitefly ketose reductase and other medium-chain dehydrogenases/reductases. | the silverleaf whitefly (bemisia argentifolii, bellows and perring) accumulates sorbitol as a thermoprotectant in response to elevated temperature. sorbitol synthesis in this insect is catalyzed by an unconventional ketose reductase (kr) that uses nadph to reduce fructose. a cdna encoding the nadph-kr from adult b. argentifolii was cloned and sequenced to determine the primary structure of this enzyme. the cdna encoded a protein of 352 amino acids with a calculated molecular mass of 38.2 kda. th ... | 1999 | 10196734 |
| mini tomato genotypes resistant to the silverleaf whitefly and to two-spotted spider mites. | the mini tomato production has expanded, becoming an amazing alternative for enterprise. despite all commercial potential, the cultivation has the occurrence of pests as main obstacle during the crop development. nowadays, there are no researches that aimed obtaining genotypes with high acylsugar content, capable of providing a broad-spectrum resistance to pests. this study aimed the selection of mini tomato genotypes, with high acylsugar content, and checking the resistance level to the silverl ... | 2017 | 28340275 |
| variation in tomato host response to bemisia tabaci (hemiptera: aleyrodidae) in relation to acyl sugar content and presence of the nematode and potato aphid resistance gene mi. | two commercial cultivars of tomato, alta and peto 95, the accession line number la716 of lycopersicon pennellii and lines 94gh-006 and 94gh-033 (backcrosses between peto 95 and la716), with different leaf acyl sugar contents were screened for resistance to bemisia argentifolii bellows & perring (corresponding to the spanish b-biotype of bemisia tabaci (gennadius)), in greenhouse- and field-no-choice experiments. there was no oviposition on la716 (with the highest acyl sugar content) while the gr ... | 2000 | 10948376 |
| impact of melon accessions resistant to aphids on the demographic potential of silverleaf whitefly. | bemisia tabaci (gennadius) and aphis gossypii glover are devastating melon, cucumis melo l., pests. the geographic areas where they occur overlap, and the same chemicals are used to control both of them. therefore, to reduce pesticide use, it would be necessary to breed melon lines that simultaneously express a resistance to both insects. female survival; the time when reproduction starts, peaks, and ends; the number of female offspring at the reproductive peak; and total reproduction (s) were d ... | 2005 | 15889749 |
| insecticidal activity and chemical composition of volatile oils from hyptis martiusii benth. | the essential oils from leaves and inflorescences of hyptis martiusii benth were analyzed by gc-ms. twenty-six compounds representing 93.2% of the essential oil of leaves were characterized; delta-3-carene (22.5%), 1,8-cineole (24.27%), beta-caryophyllene (6.15%), and bicyclogermacrene (6.32%) were found as the major components. in the essential oil of inflorescences 27 compounds representing 87.7% of the oil were identified. the major components were delta-3-carene (13.5%), alpha-pinene (5.78%) ... | 2003 | 12797740 |
| new insecticides for management of tomato yellow leaf curl, a virus vectored by the silverleaf whitefly, bemisia tabaci. | greenhouse studies using a randomized complete block design were carried out to evaluate the effect of six insecticides on transmission of tomato yellow leaf curl virus (tylcv) by the silverleaf whitefly, bemisia tabaci biotype b gennadius (hemiptera: aleyrodidae) to tomato, lycopersicon esculentum (miller) (solanales: solanaceae), seedlings that were inoculated with whiteflies from a tylcv colony in cages 3, 7, or 14 d after treatment with insecticide. the purpose was to reveal differences in r ... | 2014 | 25368089 |
| effects of the virus satellite gene βc1 on host plant defense signaling and volatile emission. | tomato yellow leaf curl china virus spreads together with its invasive vector, the silverleaf whitefly b biotype, which exhibits higher growth rates on infected plants. previous studies indicate that the virus satellite gene βc1 accounts for the visible symptoms of infection and inhibits the constitutive expression of jasmonic acid (ja)--a phytohormone involved in plant defense against whiteflies--and of some ja-regulated genes. here we present new details of the effects of on plant signaling an ... | 2013 | 23299332 |
| use of the synergist piperonyl butoxide can slow the development of alpha-cypermethrin resistance in the whitefly bemisia tabaci. | the development of insecticide resistance in insect pests of crops is a growing threat to sustainable food production, and strategies that slow the development of resistance are therefore urgently required. the insecticide synergist piperonyl butoxide (pbo) inhibits certain insect detoxification systems and so may delay the evolution of metabolic resistance. in the current study we characterized resistance development in the silverleaf whitefly, bemisia tabaci, after selection with either a neon ... | 2017 | 27869336 |
| performance of bemisia tabaci biotype b on soybean genotypes. | bemisia tabaci (genn.) (hemiptera: aleyrodidae) has been recognized as an important pest of many agricultural systems including soybean [glycine max (l.) merrill] crops. as an alternative to chemical control, the use of resistant genotypes represents an important tool for integrated pest management (ipm). this study aimed to evaluate the biological development of bemisia tabaci biotype b confined on 13 soybean genotypes under greenhouse conditions. initially, the nymphal period, complete develop ... | 2017 | 27653045 |
| lethal and inhibitory activities of plant-derived essential oils against bemisia tabaci gennadius (hemiptera: aleyrodidae) biotype b in tomato. | the silverleaf whitefly bemisia tabaci (genn.) biotype b (hemiptera: aleyrodidae) is one of the most severe tomato pests in the world. the damage caused by this insect may compromise up to 100% of crop production, and management of this pest has relied on spraying of synthetic insecticides. however, due to the environmental issues associated with this practice, alternative methods such as the use of botanical pesticides are now used as a strategy of integrated pest management (ipm). we evaluated ... | 2016 | 26712319 |
| use of lablab (lablab purpureus (l.) sweet) for bio-control by native arthropods and its effect on yield of pumpkins. | silverleaf whitefly (slw, bemisia tabaci meam1) and aphids are sap-sucking insects, which pose a serious threat to australian cucurbit crops and the horticulture industry. traditional chemical control for these insect pests is becoming less effective, and there is a need to search for alternative or supplementary methods. this study aimed to manipulate the habitat of pumpkin crops in a tropical setting (queensland, australia), by growing pumpkins (var. japanese pumpkin) alone and between lablab ... | 2016 | 26693799 |
| potential of five brazilian populations of phytoseiidae (acari) for the biological control of bemisia tabaci (insecta: hemiptera). | biotype b of the whitefly, bemisia tabaci (gennadius) (hemiptera: aleyrodidae), causes considerable losses to growers worldwide. phytoseiid mites have been successfully used for the control of this pest in several countries. the brazilian phytoseiid fauna is very diverse and potentially useful for this purpose. the aim of this study was to evaluate five brazilian populations of phytoseiids as candidates for the control of the whitefly, a serious pest of different crops worldwide. evaluated speci ... | 2015 | 26470100 |
| potential of two populations of amblyseius swirskii (acari: phytoseiidae) for the control of bemisia tabaci biotype b (hemiptera: aleyrodidae) in brazil. | predatory mites of the family phytoseiidae are commercialized in european and north american countries for the control of whiteflies (insecta: aleyrodidae). amblyseius swirskii athias-henriot (acari: phytoseiidae) is one of the predators used for that purpose. this predator is not found in brazil and in many other countries, but its introduction could promote biological control of bemisia tabaci (gennadius) biotype b (silverleaf whitefly) in those countries. the aim of this study was to compare ... | 2015 | 26387112 |
| population dynamics of bemisia argentifolii (homoptera: aleyrodidae) on spring collard and relationship to yield in the lower rio grande valley of texas. | seasonal population dynamics of the silverleaf whitefly, bemisia argentifolii bellows & perring [formerly known as the sweetpotato whitefly, b. tabaci (gennadius) biotype "b"], was investigated on collard (brassica oleracea l. variety acephala) during spring 1998 and 1999 in the lower rio grande valley of texas. yield loss caused by whitefly was determined by using insecticides to suppress whitefly populations to a low level. although b. argentifolii populations of adults and immatures fluctuate ... | 2000 | 10902326 |
| generating within-plant spatial distributions of an insect herbivore based on aggregation patterns and per-node infestation probabilities. | most predator-prey models extrapolate functional responses from small-scale experiments assuming spatially uniform within-plant predator-prey interactions. however, some predators focus their search in certain plant regions, and herbivores tend to select leaves to balance their nutrient uptake and exposure to plant defenses. individual-based models that account for heterogeneous within-plant predator-prey interactions can be used to scale-up functional responses, but they would require the gener ... | 2015 | 26313173 |
| baseline susceptibility of bemisia tabaci b biotype (hemiptera: aleyrodidae) populations from california and arizona to spirotetramat. | baseline toxicity levels to foliarly applied spirotetramat were established for 19 field populations of whiteflies, bemisia tabaci (gennadius) b biotype (=bemisia argentifolii bellows & perring) (hemiptera: aleyrodidae) from arizona and california in 2008 and 2009. the susceptibility data were determined against the second instar of b. tabaci field collections before the registration and widespread use of spirotetramat in california. three strains of whitefly, resistant to either bifenthrin, imi ... | 2014 | 24772560 |
| records of natural enemies of bemisia tabaci (genn.) (hemiptera: aleyrodidae) biotype b in brazil. | collections of natural enemies of bemisia tabaci biotype b (genn.) (hemiptera: aleyrodidae) were made in lavras, state of minas gerais, brazil. in the greenhouse, 6,495 predators and 16,628 parasitoids belonging to three families were collected. in the field, 267 predators and 344 parasitoids belonging to five families were found. for the first time in brazil, five species of predators associated with this whitefly were reported. because of the diversity of natural enemies of b. tabaci biotype b ... | 2014 | 27193527 |
| bemisia tabaci nomenclature: lessons learned. | the nomenclature used within the whitefly research community for different putative species within bemisia tabaci (sensu russell) remains highly variable and confused. this was evident by the many different naming schemes researchers were using in their presentations at the 1st international whitefly symposium in kolymbari, crete, greece (20-24 may 2013). i wanted to try to document how we, as a community, have arrived at such a state of confused nomenclature. this also included an investigation ... | 2014 | 24338873 |
| population variability of bemisia tabaci (genn.) in different hosts. | the silverleaf whitefly, bemisia tabaci (genn.) (hemiptera: aleyrodidae), is a cryptic species complex that contains some of the most damaging pests in tropical and subtropical regions. recent studies have indicated that this complex is composed of at least 24 distinct and morphologically indistinguishable species that mainly differ in their ability to transmit phytoviruses, adapt to hosts, and induce physiological changes in certain hosts. the importance of this species has been increasing worl ... | 2013 | 24222237 |
| comparative antifeedant activities of polygodial and pyrethrins against whiteflies (bemisia tabaci) and aphids (myzus persicae). | polygodial, a sesquiterpene dialdehyde of the drimane family, has been shown to have deterrent and antifeedant effects on various insect species, including myzus persicae (sulzer), spodoptera spp. and leptinotarsa decemlineata (say). this compound may have potential as a broad-spectrum biocontrol agent, similar to pyrethrins, given that it was previously reported to improve yield when sprayed on barley fields. | 2014 | 23868321 |
| spatiotemporal patterns of induced resistance and susceptibility linking diverse plant parasites. | induced defenses mediate interactions between parasites sharing the same host plant, but the outcomes of these interactions are challenging to predict because of spatiotemporal variation in plant responses and differences in defense pathways elicited by herbivores or pathogens. dissecting these mediating factors necessitates an approach that encompasses a diversity of parasitic feeding styles and tracks interactions over space and time. we tested indirect plant-mediated relationships across thre ... | 2013 | 23851986 |
| low polymorphism revealed in new microsatellite markers for bemisia tabaci (hemiptera: aleyrodidae). | the silverleaf whitefly (bemisia tabaci) is actually a complex of morphologically indistinct species that vary in their capacity to transmit plant viruses and to induce physiological disorders in plants of economic importance. the worldwide impact of this whitefly has increased greatly, as it is a vector of various types of phytovirus, especially geminiviruses, in plants of economic importance. the adaptability of b. tabaci to many regions of the world has fostered the appearance of various biot ... | 2012 | 23212329 |
| short-term and transgenerational effects of the neonicotinoid nitenpyram on susceptibility to insecticides in two whitefly species. | the cosmopolitan silverleaf whitefly, bemisia tabaci which had coexisted with trialeurodes vaporariorum in northern china for many years, has become the dominant species in the last years. recent reports show that it is gradually displacing the other greenhouse whitefly species. neonicotinoid, which includes nitenpyram, is a major group of insecticides used against whiteflies in various crops. when exposed to low doses of insecticides, insects may develop resistance by adapting physiologically. ... | 2012 | 22661314 |
| 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 |
| 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 |
| [oviposition behavior of the silverleaf whitefly bemisia tabaci biotype b on tomato]. | the objective of this work was to evaluate the influence of the leaf surface, the insect geotropic behavior and the type of foliar trichome on bemisia tabaci (genn.) biotype b oviposition on tomato leaves. bemisia tabaci females were confined in acrylic boxes in which tomato leaflets were fixed at the bottom and top part of the boxes to allow insects to access the leaf surface to be tested (adaxial and/or abaxial) in both no-choice and free choice tests. oviposition was always higher when the le ... | 2009 | 19347106 |
| inter-seasonal population dynamics and pest status of bemisia tabaci (gennadius) biotype b in an australian cropping system. | bemisia tabaci, biotype b, commonly known as the silverleaf whitefly (slw) is an alien species that invaded australia in the mid-90s. this paper reports on the invasion ecology of slw and the factors that are likely to have contributed to the first outbreak of this major pest in an australian cotton cropping system. population dynamics of slw within whitefly-susceptible crop (cotton and cucurbit) and non-crop vegetation (sowthistle, sonchus spp.) components of the cropping system were investigat ... | 2009 | 19063758 |
| [factors affecting oviposition of bemisia tabaci (genn.) biotype b in sweet pepper]. | bemisia tabaci (gen.) biotype b is considered a pest of economical importance for several vegetables. the oviposition behaviour of the whilefly was evaluated in sweet pepper plants. the trials were carried out under greenhouse condition and in the laboratory of entomology of defers/unesp, campus of ilha solteira-sp, with the sweet pepper magali-r genotype. the effect of plant age on the whitefly oviposition was evaluated in free-choice tests, in plants, 25, 30, 35, 40 and 45-day-old, as egg dist ... | 2008 | 18506298 |
| baseline susceptibility of bemisia tabaci b biotype (hemiptera: aleyrodidae) populations from california and arizona to spiromesifen. | susceptibility to spiromesifen, a tetronic acid derivative, was determined for three imidacloprid-resistant strains and 12 geographically discrete natural populations of bemisia tabaci (gennadius) (=bemisia argentifolii bellows & perring) (hemiptera: aleyrodidae) from california and arizona by laboratory bioassays. newly emerged first instars were sprayed with aqueous serial dilutions of spiromesifen and evaluated for toxicity to establish baseline susceptibility data. interpopulation variabilit ... | 2008 | 18330133 |
| 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 |
| 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 |
| bemisia argentifolii is a race of b. tabaci (hemiptera: aleyrodidae): the molecular genetic differentiation of b. tabaci populations around the world. | the phylogenetic relationships between genotypes of bemisia tabaci were compared using its1 and co1 nucleotide sequences. phylogenetic and minimum spanning network analyses identified six major races, asia, bali, australia, sub-saharan africa, mediterranean/asia minor/africa and new world as well as a large collection of genotypes from the asia region with no strong association with any of the races. the term race is based on its usage in mallet (2001). mating incompatibility occurs between some ... | 2005 | 15960874 |
| the nymphal-adult molt of the silverleaf whitefly (bemisia argentifolii): timing, regulation, and progress. | the developmental progress of silverleaf whitefly (bemisia argentifolii) 3rd instars and 4th instar/pharate adults was monitored using a tracking system that had been designed to identify synchronous individuals in another species of whitefly, the greenhouse whitefly, trialeurodes vaporariorum. when reared on greenbean under conditions of ld 16:8 and a temperature of 26 +/- 2 degrees c, the body depth of 3rd instar slwfs increased from approximately 0.04 mm (stage 2) to 0.175-0.2 mm (stage 7-8) ... | 2002 | 12232874 |
| volatile emissions triggered by multiple herbivore damage: beet armyworm and whitefly feeding on cotton plants. | plants are commonly attacked by more than one species of herbivore, potentially causing the induction of multiple, and possibly competing, plant defense systems. in the present paper, we determined the interaction between feeding by the phloem feeder silverleaf whitefly (swf), bemisia tabaci gennadius (b-biotype = b. argentifolii bellows and perring), and the leaf-chewing beet armyworm (baw), spodoptera exigua hübner, with regard to the induction of volatile compounds from cotton plants. compare ... | 2003 | 14682532 |
| effect of whitefly parasitoids on the cuticular lipid composition of bemisia argentifolii (homoptera: aleyrodidae) nymphs. | experiments were conducted to determine the effects of whitefly parasitoids on the cuticular lipid composition of the silverleaf whitefly, bemisia argentifolii bellows and perring [=sweetpotato whitefly, bemisia tabaci (gennadius), biotype b] nymphs. the cuticular lipids of b. argentifolii nymphs that had been attacked by parasitic wasps, either eretmocerus mundus mercet or encarsia pergandiella howard, were characterized by capillary gas chromatography and cgc-mass spectrometry and the results ... | 2000 | 10861868 |
| characterization and distribution of esterase electromorphs in the whitefly, bemisia tabaci (genn.) (homoptera: aleyrodidae). | esterase profiles were examined for over 40 populations of the whitefly, bemisia tabaci, obtained from native and cultivated plant hosts worldwide. twelve unique electromorphs were identified from distinct populations concentrated largely in central america, africa, and india. one electromorph, type b, has recently been proposed as a separated species, bemisia argentifolii, and has recently spread throughout much of the world. when considered with evidence from mating studies and the ability to ... | 1995 | 8595048 |
| nymphal survival and movement of crawlers of bemisia argentifolii (homoptera: aleyrodidae) on leaf surfaces of selected vegetables. | bemisia argentifolii bellows & perring generally feeds and develops on the under leaf surface of most host plants, but in excess of 50% of the immature population may be found on the upper surface of some host species. this study determined the influence of leaf surface on survival of immature b. argentifolii and the likelihood of movement by the crawler (1st instar) from the upper (adaxial) leaf surface on selected vegetable hosts. laboratory, tests were conducted on 5 vegetables: cantaloupe, c ... | 1999 | 11543187 |
| deciphering systemic wound responses of the pumpkin extrafascicular phloem by metabolomics and stable isotope-coded protein labeling. | in cucurbits, phloem latex exudes from cut sieve tubes of the extrafascicular phloem (efp), serving in defense against herbivores. we analyzed inducible defense mechanisms in the efp of pumpkin (cucurbita maxima) after leaf damage. as an early systemic response, wounding elicited transient accumulation of jasmonates and a decrease in exudation probably due to partial sieve tube occlusion by callose. the energy status of the efp was enhanced as indicated by increased levels of atp, phosphate, and ... | 2012 | 23085839 |
| influence of cover crop and intercrop systems on bemisia argentifolli (hemiptera: aleyrodidae) infestation and associated squash silverleaf disorder in zucchini. | field experiments were conducted to evaluate the effects of cover cropping and intercropping on population densities of silverleaf whitefly, bemisia argentifolli bellow and perring, and the incidence of squash silverleaf disorder (ssl) in zucchini, cucurbita pepo l., in oahu, hi. two cover crops, buckwheat (bw), fagopyrum esculentum moench, and white clover (wc), trifolium repens l., or sunn hemp (sh), crotolaria juncea l., and an intercropped vegetable, okra, abelmonchus esculentus l., were eva ... | 2009 | 19389294 |
| impact of bemisia argentifolii (homoptera: auchenorrhyncha: aleyrodidae) infestation and squash silverleaf disorder on zucchini yield and quality. | fruit yield and quality of zucchini, cucurbita pepo l., plants infested with bemisia argentifolii bellows & perring were evaluated in a screenhouse under spring and fall growing conditions by using closely related sister lines that were either susceptible (zuc61) or tolerant (zuc76-slr) to squash silverleaf disorder. our objective was to test separately the effects of level of whitefly infestation and expression of silverleaf symptoms on zucchini yield and quality. in a second experiment, yield ... | 2004 | 15666769 |
| influence of bemisia argentifolii (homoptera: aleyrodidae) infestation and squash silverleaf disorder on zucchini seedling growth. | we investigated the effect of different levels of infestation by whiteflies, bemisia argentifolii bellows & perring, on the growth and pigment concentrations of seedlings of zucchini, cucurbita pepo l., that differed in their tolerance to squash silverleaf disorder. genetically similar sister lines that were either tolerant (zuc76-slr) or susceptible (zuc61) to silverleaf disorder exhibited reduced plant height, internode length, plant dry weight, and petiole length in response to whitefly feedi ... | 2004 | 15279296 |
| effect of urea fertilizer application on soluble protein and free amino acid content of cotton petioles in relation to silverleaf whitefly (bemisia argentifolii) populations. | the impact of urea nitrogen fertilization on silverleaf whitefly, bemisia argentifolii bellows & perring, population dynamics was examined in field-grown cotton (gossypium hirsutum l.). five urea nitrogen treatments were tested, consisting of soil applications of 0, 112, 168, and 224 kg nitrogen per hectare, and acombined soil-foliar application of 112:17 kg nitrogen per hectare. a positive response was observed between n application rates and the measured levels of nitrate n in petioles from ma ... | 2003 | 12757331 |
| mathematical modeling of cotton leaf curl virus with respect to environmental factors. | this study mathematically correlates incidence of cotton leaf curl virus (clcuv), environmental factors (i.e., rainfall, humidity and temperature), and silverleaf whitefly population in agricultural system of pakistan. it has been concluded that the disease is directly linked with rainfall and humidity. the third most influential factor in defining clcuv incidence is the vector population, which is also strictly dependent upon monthly mean temperature of pakistan. developed mathematical interrel ... | 2015 | 26185686 |
| host plant pubescence: effect on silverleaf whitefly, bemisia argentifolii, fourth instar and pharate adult dimensions and ecdysteroid titer fluctuations. | the ability to generate physiologically synchronous groups of insects is vital to the performance of investigations designed to test insect responses to intrinsic and extrinsic stimuli. during a given instar, the silverleaf whitefly, bemisia argentifolii, increase in depth but not in length or width. a staging system to identify physiologically synchronous 4th instar and pharate adult silverleaf whiteflies based on increasing body depth and the development of the adult eye has been described pre ... | 2003 | 15841241 |
| selection for fenpropathrin and fenpropathrin + acephate resistance in the silverleaf whitefly (homoptera: aleyrodidae). | a large, genetically diverse pool of bemisia argentifolii bellows & perring was collected in 1994 from different crops, and a mixed colony was established in the laboratory. subsets of this colony were reared on cotton plants held in large plexiglas cages, and adult whiteflies were selected for resistance to fenpropathrin and to fenpropathrin + acephate (1:5). selection was performed by exposing adults to treated glass vials at doses sufficient to give 60-80% mortality. thirteen generations of a ... | 2000 | 10902354 |
| 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 |
| pyriproxyfen resistance of bemisia tabaci (homoptera: aleyrodidae) biotype b: metabolic mechanism. | juvenile hormone (jh) analog insecticides are relatively nontoxic to vertebrates and provide efficient control of key arthropod pests. one jh analog, pyriproxyfen, has provided over a decade of exceptional management of whiteflies in cotton of the southwestern united states. thwarting resistance to pyriproxyfen in bemisia tabaci (gannadius) (a.k.a. bemisia argentifolii bellows and perring) has been the focus of an integrated resistance management program because this insecticide was first regist ... | 2010 | 20214381 |
| chemical composition and insecticidal activity of essential oils from vanillosmopsis pohlii baker against bemisia argentifolii. | essential oils from the heartwood and leaves of specimens of vanillosmopsis pohlii collected in two different localities were analyzed by gc-ms. the major constituent of both heartwood essential oils was the sesquiterpene alpha-bisabolol. essential oil composition from leaves was quite different for two specimens and showed beta-pinene and e-caryophyllene as principal constituents. the essential oil of heartwood and the pure sesquiterpene alpha-bisabolol were tested against bemisia argentifolii, ... | 2004 | 15366836 |
| host plant effects on resistance to bifenthrin in silverleaf whitefly (homoptera: aleyrodidae). | effects of host plants on resistance to bifenthrin in the silverleaf whitefly, bemisia argentifolii bellows & perring, were determined by lc50 bioassay. in addition, inheritance of resistance to bifenthrin was investigated beginning with a single source of a bifenthrin-susceptible population. overall, the resistance ratio between the bifenthrin-susceptible population and the selected bifenthrin-resistant population from the same source population was 915-fold after 1 yr in the greenhouse. respon ... | 2003 | 14503606 |
| baseline susceptibility and development of resistance to pyriproxyfen in bemisia argentifolii (homoptera: aleyrodidae) in arizona. | pyriproxyfen (knack) was registered in arizona cotton, as the crucial component of a resistance management plan, to control whitefly bemisia argentifolii (bellows & perring) in 1996. a statewide monitoring program was implemented at the same time to detect and monitor whitefly resistance to this novel insecticide. bioassays involving dipping of leaves infested with whitefly eggs showed that all arizona whiteflies tested were highly susceptible to pyriproxyfen in 1996. the lc50 estimates were in ... | 2003 | 14503605 |
| effect of high temperature on the metabolic processes affecting sorbitol synthesis in the silverleaf whitefly, bemisia argentifolii. | whiteflies accumulate the polyhydric alcohol, sorbitol, when exposed to temperatures greater than about 30 degrees c. feeding experiments using artificial diets containing labeled sucrose showed that more of the label was incorporated into whitefly bodies and less was excreted in the honeydew when feeding was conducted at 41 compared with 25 degrees c. analysis of the components of the honeydew showed that more of the excreted label was in glucose and fructose and less in trehalulose at 41 degre ... | 1999 | 12770392 |
| a thermoprotective role for sorbitol in the silverleaf whitefly, bemisia argentifolii. | accumulation of polyols in insects is well known as a cold-hardening response related to overwintering or to protection against cold shock. the silverleaf whitefly (bemisia argentifolii, bellows and perring) is a major insect pest in tropical and subtropical regions where heat stress and desiccation pose formidable threats to survival. we found that sorbitol levels increased ten-fold when whiteflies were exposed to elevated temperatures. sorbitol levels rose from 0.16nmolwhitefly(-1) at 25 degre ... | 1998 | 12769942 |
| triacylglycerol and phospholipid fatty acids of the silverleaf whitefly: composition and biosynthesis. | the identification and composition of the fatty acids of the major lipid classes (triacylglycerols and phospholipids) within bemisia argentifolii bellows and perring (homoptera: aleyrodidae) nymphs were determined. comparisons were made to fatty acids from the internal lipids of b. argentifolii adults. the fatty acids, as ester derivatives, were analyzed by capillary gas chromatography (cgc) and cgc-mass spectrometry (ms). all lipid classes contained variable distributions of eight fatty acids: ... | 2003 | 12761874 |
| action threshold for applying insect growth regulators to tomato for management of irregular ripening caused by bemisia argentifolii (homoptera: aleyrodidae). | the whitefly bemisia argentifolii bellows & perring is a major pest of tomatoes, causing an irregular ripening disorder characterized externally by incomplete or inhibited reddening of fruit, especially in longitudinal sections, and internally by an increase in the amount of white tissue. experiments were undertaken during the spring and fall of 1997 and 1998 and the spring of 1999 to develop an action threshold for applying the insect growth regulators (igrs) buprofezin and pyriproxyfen to mana ... | 2002 | 12020016 |
| repellency of a kaolin particle film, surround, and a mineral oil, sunspray oil, to silverleaf whitefly (homoptera: aleyrodidae) on melon in the laboratory. | surround, a kaolin-based particle film formulation, and sunspray oil, a mineral oil, were evaluated alone or in combination in choice and no-choice laboratory assays on melon leaves for repellency to adults of the silverleaf whitefly, bemisia argentifolii bellows & perring. in no-choice tests, the number of adults and eggs on leaves did not significantly differ among the three treatments and the water control when materials were applied to either the tipper or lower leaf surface. significantly f ... | 2002 | 12020007 |
| inter-regional differences in baseline toxicity of bemisia argentifolii (homoptera: aleyrodidae) to the two insect growth regulators, buprofezin and pyriproxyfen. | a survey of 53 bemisia argentifolii bellows & perring populations from different agricultural regions in california and arizona was conducted from 1997 to 1999 to establish baseline toxicological responses to buprofezin and pyriproxyfen. although both compounds proved to be highly toxic even in minute quantities to specific stages, geographical and temporal differences in responses were detected using a leaf spray bioassay technique. monitoring for three years revealed that six to seven populati ... | 2001 | 11777061 |
| characterization and functions of the whitefly egg pedicel. | for the silverleaf whitefly, bemisia argentifolii (bellows and perring) (homoptera: aleyrodidae), scanning and transmission electron microscopic techniques were used to observe the characteristics of egg oviposition into both plant cells/tissues and artificial membranes, and to document the morphology of mature egg pedicles removed from the ovaries of females. the exterior of the distal portion of the pedicel consisted of a tangled array of fibrous structures (0.2-0.3 microm in diameter) that co ... | 2002 | 11754091 |
| crystal structure of the nadp(h)-dependent ketose reductase from bemisia argentifolii at 2.3 a resolution. | polyhydric alcohols are widely found in nature and can be accumulated to high concentrations as a protection against a variety of environmental stresses. it is only recently, however, that these molecules have been shown to be active in protection against heat stress, specifically in the use of sorbitol by the silverleaf whitefly, bemisia argentifolii. we have determined the structure of the enzyme responsible for production of sorbitol in bemisia argentifolii, nadp(h)-dependent ketose reductase ... | 2001 | 11237597 |
| efficacy of cc traps and seasonal activity of adult bemisia argentifolii (homoptera: aleyrodidae) in imperial and palo verde valleys, california. | adult whitefly bemisia argentifolii bellows & perring trap (cc trap) catches were compared with suction type trap catches. cc trap catches were significantly correlated to the suction trap catches. higher numbers of b. argentifolii adults were caught in cc traps oriented toward an untreated, b. argentifolii-infested, cotton field as compared with traps oriented toward bermuda grass fields, farm roads, or fallow areas. cc trap catches at five heights above ground (from 0 to 120 cm) were significa ... | 2001 | 11233132 |
| density-yield relationships and economic injury levels for bemisia argentifolii (homoptera: aleyrodidae) in cantaloupe in texas. | a range of infestation levels of the whitefly bemisia argentifolii bellows & perring were established across experimental field plots of cantaloupe by varying insecticide treatments to evaluate the relationships between whitefly density and crop yield and quality. high levels of whitefly adults and immatures were associated with significant reductions in fruit yield, a decrease in fruit size, and an increase in the percentage of fruits with sooty mold. yield loss rates (kg/ha/adult or nymph) dec ... | 2001 | 11233111 |
| effect of the alpha-glucosidase inhibitor, bromoconduritol, on carbohydrate metabolism in the silverleaf whitefly, bemisia argentifolii. | the involvement of alpha-glucosidase in the partitioning of ingested sucrose between excretion and incorporation was investigated in the silverleaf whitefly (bemisia argentifolii). approximately half of the alpha-glucosidase activity in adult whiteflies was soluble and the remainder was associated with membranes. in contrast, almost all of the trehalulose synthase was membrane-associated. isoelectric focusing revealed that soluble and membrane-associated alpha-glucosidases were each composed of ... | 2000 | 11169751 |
| isobemisiose: an unusual trisaccharide abundant in the silverleaf whitefly, bemisia argentifolii. | the major soluble carbohydrates in the silverleaf whitefly, bemisia argentifolii, were glucose, alpha,alpha-trehalose and an unknown sugar. analysis of the unknown sugar and its chemical and enzymatic digestion products by high-performance liquid chromatography (hplc) showed that it was probably a trisaccharide, consisting entirely of glucose, and containing both alpha,alpha-trehalose and isomaltose moieties. matrix-assisted laser desorption mass spectrometry, mass spectrometry and 13c and 1h nu ... | 2001 | 11166307 |
| impact of bemisia whiteflies (homoptera: aleyrodidae) on alfalfa growth, forage yield, and quality. | a 3-yr project was initiated in 1993 to examine the effects of insecticides and sustained whitefly, bemisia argentifolii bellows & perring [aka. b tabaci gennadius (strain b)], feeding on alfalfa plant growth and vigor in greenhouse cage studies, and to determine the impact of natural bemisia whitefly populations on alfalfa forage yields and quality in a large-plot field experiment. alfalfa plant growth and vigor after exposure to imidacloprid and a mixture of fenpropathrin and acephate insectic ... | 2000 | 11142299 |
| effects of planting pattern of collards on resistance to whiteflies (homoptera: aleyrodidae) and on parasitoid abundance. | fourteen collard entries, brassica oleraceae l., acephala group, were evaluated for resistance to natural populations of bemisia argentifolii bellows & perring in replicated field plots in charleston, sc. glossy-leaf phenotypes ('sc glaze', 'sc landrace,' 'green glaze') were the most resistant collard entries and had fewer whiteflies than the nonglossy, open-pollinated cultivars. also, two f1 hybrid cultivars with normal, nonglossy leaves ('blue max' and 'top bunch') were resistant. in laborator ... | 2000 | 10985035 |
| effects of temperature and dietary sucrose concentration on respiration in the silverleaf whitefly, bemisia argentifolii. | a system consisting of a flow-through chamber connected to a commercial infrared gas analysis system was developed to measure homopteran respiration during feeding. using this system, respiration rates of 202 and 206 µmol co(2) h(-1) g(-1) (4.96 and 5.04 ml co(2) h(-1) g(-1)) were determined for whiteflies and cotton aphids, respectively, at 25 degrees c on diets containing 15% sucrose. these rates were considerably higher than those of other stationary insects, indicating that whiteflies and ap ... | 2000 | 10891574 |
| feasible sampling plan for bemisia tabaci control decision-making in watermelon fields. | the silverleaf whitefly bemisia tabaci is one of the most important pests of watermelon fields worldwide. conventional sampling plans are the starting point for the generation of decision-making systems of integrated pest management programs. the aim of this study was to determine a conventional sampling plan for b. tabaci in watermelon fields. | 2017 | 28544773 |