Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| investigating the mode of action of sulfoxaflor: a fourth-generation neonicotinoid. | the precise mode of action of sulfoxaflor, a new nicotinic acetylcholine receptor-modulating insecticide, is unclear. a detailed understanding of the mode of action, especially in relation to the neonicotinoids, is essential for recommending effective pest management practices. | 2013 | 23112103 |
| dynamics of membrane potential variation and gene expression induced by spodoptera littoralis, myzus persicae, and pseudomonas syringae in arabidopsis. | biotic stress induced by various herbivores and pathogens invokes plant responses involving different defense mechanisms. however, we do not know whether different biotic stresses share a common response or which signaling pathways are involved in responses to different biotic stresses. we investigated the common and specific responses of arabidopsis thaliana to three biotic stress agents: spodoptera littoralis, myzus persicae, and the pathogen pseudomonas syringae. | 2012 | 23118859 |
| water stress and aphid feeding differentially influence metabolite composition in arabidopsis thaliana (l.). | little is known about how drought stress influences plant secondary metabolite accumulation and how this affects plant defense against different aphids. we therefore cultivated arabidopsis thaliana (l.) plants under well-watered, drought, and water-logged conditions. two aphid species were selected for this study: the generalist myzus persicae (sulzer) and the crucifer specialist brevicoryne brassicae (l.). metabolite concentrations in the phloem sap, which influence aphid growth, changed partic ... | 2012 | 23144921 |
| variation in resistance mechanisms to the green peach aphid among different prunus persica commercial cultivars. | abstract peaches and nectarines are frequently attacked by the green peach aphid myzus persicae (sulzer), with significant negative impacts on fruit production. the genetic variability of resistance to this aphid among commercial cultivars of prunus persica (l.) batsch and prunus persica variety nectarina was evaluated in this study. in total, 16 cultivars of p. persica were selected to evaluate the occurrence and population growth rate of m. persicae in commercial orchards, as well as in no-cho ... | 2012 | 23156185 |
| the green peach aphid, myzus persicae, acquires a lipoxygenase5-derived oxylipin from arabidopsis thaliana, which promotes colonization of the host plant. | oxylipins derived from lipoxygenase (lox) activity play important roles in plant growth, development and stress response. in a recent study, we provided evidence that infestation of arabidopsis thaliana foliage by the green peach aphid (gpa; myzus persicae), a phloem sap-consuming insect, was promoted by plant lox5-derived oxylipins. in comparison to the wild-type (wt) plant, gpa population was smaller on the arabidopsis lox5 mutant. the insect spent less time feeding from the sieve element and ... | 2013 | 23221749 |
| immunolocalization of odorant-binding proteins on antennal chemosensilla of the peach aphid myzus persicae (sulzer). | the antennal sensilla of myzus persicae were mapped using scanning and transmission electron microscopy. placoid sensilla and coeloconic sensilla were found on the 6th segments, whereas 2 types of trichoid sensilla were present all through the length of the antenna. a single sensillum placoideum was located on the 5th segment, whereas alate aphids also presented placoid sensilla on the 3rd antennal segment. immunocytochemical localization of odorant-binding proteins (obps) was performed on ultra ... | 2013 | 23222972 |
| the nerium oleander aphid aphis nerii is tolerant to a local isolate of aphid lethal paralysis virus (alpv). | in a survey that was conducted during the year 2011, a local strain of aphid lethal paralysis virus (alpv) was identified and isolated from a wild population of aphis nerii aphids living on nerium oleander plants located in northern israel. the new strain was tentatively named (alpv-an). rna extracted from the viral particles allowed the amplification and determination of the complete genome sequence. the virus genome is comprised of 9835 nucleotides. in a blast search analysis, the alpv-an sequ ... | 2013 | 23229204 |
| aphid-induced accumulation of trehalose in arabidopsis thaliana is systemic and dependent upon aphid density. | trehalose is a disaccharide sugar that is now considered to be widely distributed among higher plants. trehalose has been attributed a number of roles, including control of basic plant processes, such as photosynthesis, and conferring tolerance to abiotic stresses, such as desiccation and high salinity. trehalose is also a common storage sugar used by insects. in this study, we used laboratory investigations to examine various aspects of trehalose dynamics in an aphid-host plant system (arabidop ... | 2013 | 23242075 |
| vitamin c and the abscisic acid-insensitive 4 transcription factor are important determinants of aphid resistance in arabidopsis. | aphids, like other insects, are probably unable to synthesize vitamin c (ascorbic acid), which is therefore an essential dietary nutrient that has to be obtained from the host plant. plant responses to aphids involve hormones such as salicylic acid (sa), jasmonic acid (ja), and abscisic acid (aba), but hormone/redox interactions remain poorly characterized. we therefore investigated hormone/redox signaling in the response of arabidopsis thaliana to infestation by the aphid myzus persicae, focusi ... | 2013 | 23343093 |
| aphid feeding behavior in relation to potato virus y (pvy) acquisition. | potato virus y (pvy) is transmitted by aphids in a nonpersistent manner and aphid species differ in their ability to transmit pvy. during host selection, aphids will land and probe on nonhost plant species and this behavior is an important component of the epidemiology of many aphid-transmitted viruses. in this study, we hypothesized that host selection behavior varies between aphid species and the host or nonhost status of the plant and this behavior will modulate their ability to acquire pvy. ... | 2012 | 23356052 |
| survey of resistance to four insecticides and their associated mechanisms in different genotypes of the green peach aphid (hemiptera: aphididae) from chile. | the green peach aphid, myzus persicae (sulzer) (hemiptera: aphididae) is amajor pest of agriculture worldwide that has proved to be particularly adept at evolving insecticide resistance. several mechanisms that confer resistance to many insecticide types have been described in m. persicae. we measured the resistance status of nine multilocus genotypes (mlgs) of this aphid species collected in chile. mlgs were identified using microsatellite markers, and these mlg clonal populations were measured ... | 2013 | 23448057 |
| a1-3 chromosomal translocations in italian populations of the peach potato aphid myzus persicae (sulzer) not linked to esterase-based insecticide resistance. | esterase-based resistance in the peach-potato aphid, myzus persicae (sulzer), is generally due to one of two alternative amplified carboxylesterase genes, e4 or fe4 (fast e4). the e4 amplified form is distributed worldwide and it is correlated with a particular translocation between autosomes 1 and 3, whereas the fe4 form, which has hitherto not been found to be associated with chromosomal rearrangements, is typical of the mediterranean regions. in this study, we present for the first time cytog ... | 2013 | 23448149 |
| inferring the population structure of myzus persicae in diverse agroecosystems using microsatellite markers. | diverse agroecosystems offer phytophagous insects a wide choice of host plants. myzus persicae is a polyphagous aphid common in moderate climates. during its life cycle it alternates between primary and secondary hosts. a spatial genetic population structure may arise due to environmental factors and reproduction modes. the aim of this work was to determine the spatial and temporal genetic population structure of m. persicae in relation to host plants and climatic conditions. for this, 923 indiv ... | 2013 | 23448321 |
| piperitone-derived saturated lactones: synthesis and aphid behavior-modifying activity. | two racemic and two enantiomeric pairs of new saturated lactones with the p-menthane system were obtained. the lactones were synthesized from racemic and enantiomerically enriched cis- and trans-piperitols, which were obtained from piperitone. the structures of the compounds were confirmed by spectroscopic data. the antifeedant activity of piperitone to myzus persicae was studied, and the biological consequences of structural modifications of piperitone, that is, lactonization and chiral center ... | 2013 | 23477664 |
| do asexual morphs of the peach-potato aphid, myzus persicae, utilise the aphid sex pheromone? behavioural and electrophysiological responses of m. persicae virginoparae to (4as,7s,7ar)-nepetalactone and its effect on aphid performance. | the aphid sex pheromone component (4as,7s,7ar)-nepetalactone is considered to be a potential tool for enhancing biological control of aphids. studies have confirmed its potential to attract parasitoids, increase parasitism rates in the field and also alter the spatial distribution of parasitoids. an important aspect that has been overlooked is the impact that the introduction of nepetalactone may have on aphid populations already present in field or glasshouse environments. the most prevalent pe ... | 2013 | 23480367 |
| behavioural avoidance and enhanced dispersal in neonicotinoid-resistant myzus persicae (sulzer). | the peach potato aphid myzus persicae is a major agricultural pest capable of transmitting over 100 plant viruses to a wide range of crops. control relies largely upon treatment with neonicotinoid insecticides such as thiamethoxam (tmx). in 2009, a strain denoted frc, which exhibits between 255- and 1679-fold resistance to current neonicotinoids previously linked to metabolic and target site resistance, was discovered in france. dispersal behaviour may potentially further enhance the resistance ... | 2014 | 23483696 |
| effects of simulated heat waves on an experimental plant-herbivore-predator food chain. | greater climatic variability and extreme climatic events are currently emerging as two of the most important facets of climate change. predicting the effects of extreme climatic events, such as heat waves, is a major challenge because they may affect both organisms and trophic interactions, leading to complex responses at the community level. in this study, we set up a simple three-level food chain composed of a sweet pepper plant, capsicum annuum; an aphid, myzus persicae; and a ladybeetle, col ... | 2012 | 23504840 |
| does the response of insect herbivores to cadmium depend on their feeding strategy? | phytoremediation has been proposed for the elimination of toxic metals in soil, yet little attention has been given to the performance of insects that feed on contaminant-tolerant plants. we tested the performance of two herbivores with different feeding behaviors, the cabbage looper, trichoplusia ni, and the green peach aphid, myzus persicae, reared on cadmium-tolerant brassica juncea plants that contained different concentrations of cadmium. we also tested the performance of the aphid parasito ... | 2013 | 23525953 |
| engineered resistance in potato against potato leafroll virus, potato virus a and potato virus y. | transgenic potato plants of solanum tuberosum cultivar vales sovereign were generated that expressed fused, tandem, 200 bp segments derived from the capsid protein coding sequences of potato virus y (pvy strain o) and potato leafroll virus (plrv), as well as the cylindrical inclusion body coding sequences of potato virus a (pva), as inverted repeat double-stranded rnas, separated by an intron. the orientation of the expressed double-stranded rnas was either sense-intron-antisense or antisense-in ... | 2013 | 23526159 |
| resistance of arabidopsis thaliana to the green peach aphid, myzus persicae, involves camalexin and is regulated by micrornas. | · small rnas play important roles in resistance to plant viruses and the complex responses against pathogens and leaf-chewing insects. · we investigated whether small rna pathways are involved in arabidopsis resistance against a phloem-feeding insect, the green peach aphid (myzus persicae). we used a 2-wk fecundity assay to assess aphid performance on arabidopsis rna silencing and defence pathway mutants. quantitative real-time polymerase chain reaction was used to monitor the transcriptional ac ... | 2013 | 23528052 |
| characterization of non-ltr retrotransposable tras elements in the aphids acyrthosiphon pisum and myzus persicae (aphididae, hemiptera). | a non-ltr tras retrotransposon (identified as trasap1) has been amplified in the pea aphid acyrthosiphon pisum and its presence has been assessed also in the peach potato aphid myzus persicae. this tras element possesses 2 overlapping orfs (a gag-orf1 and a pol-orf2 containing the reverse transcriptase and the endonuclease domains) that show a similarity ranging from 40% to 48% to proteins coded by other tras elements identified in insects (including the beetle tribolium castaneum and the moth b ... | 2013 | 23530141 |
| experimental test of an eco-evolutionary dynamic feedback loop between evolution and population density in the green peach aphid. | an eco-evolutionary feedback loop is defined as the reciprocal impacts of ecology on evolutionary dynamics and evolution on ecological dynamics on contemporary timescales. we experimentally tested for an eco-evolutionary feedback loop in the green peach aphid, myzus persicae, by manipulating initial densities and evolution. we found strong evidence that initial aphid density alters the rate and direction of evolution, as measured by changes in genotype frequencies through time. we also found tha ... | 2013 | 23598359 |
| expression of α-dioxygenase 1 in tomato and arabidopsis contributes to plant defenses against aphids. | plant α-dioxygenases (α-dox) are fatty acid-hydroperoxidases that contribute to the synthesis of oxylipins, a diverse group of compounds primarily generated through oxidation of linoleic (la) and linolenic acid (lna). oxylipins are implicated in plant signaling against biotic and abiotic stresses. we report here that the potato aphid (macrosiphum euphorbiae) induces slα-dox1 but not slα-dox2 expression in tomato (solanum lycopersicum). slα-dox1 upregulation by aphids does not require either jasm ... | 2013 | 23634839 |
| nonlinearities lead to qualitative differences in population dynamics of predator-prey systems. | since typically there are many predators feeding on most herbivores in natural communities, understanding multiple predator effects is critical for both community and applied ecology. experiments of multiple predator effects on prey populations are extremely demanding, as the number of treatments and the amount of labour associated with these experiments increases exponentially with the number of species in question. therefore, researchers tend to vary only presence/absence of the species and us ... | 2013 | 23638107 |
| terpenes and polyacetylenes from cultivated artemisia granatensis boiss (royal chamomile) and their defensive properties. | artemisia granatensis, an endemic endangered plant species from sierra nevada (spain) has been successfully cultivated in artificial systems (plants in artificial soil and transformed in vitro roots) to generate enough plant biomass (aerial and root) to allow for its chemical and biological study and at the same time to provide with methods for the sustainable production of the plant and its metabolites. a eudesmanolide (17) along with six sesquiterpenes (11-16), nine monoterpenes (2-10), one no ... | 2013 | 23642456 |
| retargeting of the bacillus thuringiensis toxin cyt2aa against hemipteran insect pests. | although transgenic crops expressing bacillus thuringiensis (bt) toxins have been used successfully for management of lepidopteran and coleopteran pest species, the sap-sucking insects (hemiptera) are not particularly susceptible to bt toxins. to overcome this limitation, we demonstrate that addition of a short peptide sequence selected for binding to the gut of the targeted pest species serves to increase toxicity against said pest. insertion of a 12-aa pea aphid gut-binding peptide by adding t ... | 2013 | 23650347 |
| aphicidal efficacy of scorpion- and spider-derived neurotoxins. | insect-specific neurotoxins that act within the insect hemocoel (body cavity) represent an untapped resource for insect pest management. on the basis of recent advances made in development of appropriate delivery systems for transport of these toxins from the insect gut, across the gut epithelium to their target site, we screened neurotoxins derived from scorpion or spider venom for efficacy against the pea aphid, acyrthosiphon pisum, and the green peach aphid, myzus persicae. toxins were select ... | 2013 | 23651761 |
| synergistic manipulations of plant and insect defences. | it has been demonstrated previously that cis-jasmone acts as an elicitor of plant defence mechanism(s) by inducing secondary metabolism. it has also been demonstrated that temporal synergism can result in hypersensitive insect pests due to the inhibition of metabolic enzymes. | 2014 | 23653417 |
| atmyb44 regulates resistance to the green peach aphid and diamondback moth by activating ein2-affected defences in arabidopsis. | recently we showed that the transcription activator atmyb44 regulates expression of ein2, a gene essential for ethylene signalling and insect resistance, in arabidopsis thaliana (arabidopsis). to link the transactivation with insect resistance, we investigated the wild-type and atmyb44 mutant plants, genetically complemented atmyb44 (catmyb44) and atmyb44-overexpression transgenic arabidopsis (myb44ota). we found that atmyb44 played a critical role in arabidopsis resistance to the phloem-feeding ... | 2013 | 23656500 |
| two volatile organic compounds trigger plant self-defense against a bacterial pathogen and a sucking insect in cucumber under open field conditions. | systemic acquired resistance (sar) is a plant self-defense mechanism against a broad-range of pathogens and insect pests. among chemical sar triggers, plant and bacterial volatiles are promising candidates for use in pest management, as these volatiles are highly effective, inexpensive, and can be employed at relatively low concentrations compared with agrochemicals. however, such volatiles have some drawbacks, including the high evaporation rate of these compounds after application in the open ... | 2013 | 23698768 |
| identification of orfamide a as an insecticidal metabolite produced by pseudomonas protegens f6. | the use of biosurfactants for agricultural crop protection has been gaining interest because they are generally biodegradable and environmentally friendly. in the present study, we identified an insecticidal biosurfactant produced by pseudomonas protegens f6 (f6) and examined its use for aphid control. the growth of f6 was accompanied by increased aphid mortality and decreased water surface tension. bioassay-guided chromatography coupled with instrumental analyses, nuclear magnetic resonance (nm ... | 2013 | 23763636 |
| the role of bacterial chaperones in the circulative transmission of plant viruses by insect vectors. | persistent circulative transmission of plant viruses involves complex interactions between the transmitted virus and its insect vector. several studies have shown that insect vector proteins are involved in the passage and the transmission of the virus. interestingly, proteins expressed by bacterial endosymbionts that reside in the insect vector, were also shown to influence the transmission of these viruses. thus far, the transmission of two plant viruses that belong to different virus genera w ... | 2013 | 23783810 |
| colonization of the biomass energy crop miscanthus by the three aphid species, aphis fabae, myzus persicae, and rhopalosiphum padi. | miscanthus is a perennial c4-grass that has received much interest as a potential of impact on the local agroecosytem. in this context, laboratory experiments were conducted to investigate the potential colonization of this new exotic plant species by three of the main aphid pest species of common crops in picardie, northern france. in host preference experiments, the two polyphagous aphid species studied, aphis fabae (scop) and myzus persicae (sulzer), exhibited an xclusive preference for their ... | 2013 | 23786055 |
| different reactions of potato varieties to infection by potato leafroll virus, and associated responses by its vector, myzus persicae (sulzer). | vector-dependent plant pathogens can alter their hosts such that vector behavior and pathogen spread are affected. for example, potato leafroll virus (plrv)-induces changes in volatiles emitted by potato plants (solanum tuberosum l.) that influence settling behavior by myzus persicae, a principal vector of the virus. prior work in this pathosystem has utilized a single potato variety, russet burbank, but as is true for other plant responses to biotic stresses, responses may differ among plant ge ... | 2013 | 23807432 |
| arabidopsis thaliana-myzus persicae interaction: shaping the understanding of plant defense against phloem-feeding aphids. | the phloem provides a unique niche for several organisms. aphids are a large group of hemipteran insects that utilize stylets present in their mouthparts to pierce sieve elements and drink large volumes of phloem sap. in addition, many aphids also vector viral diseases. myzus persicae, commonly known as the green peach aphid (gpa), is an important pest of a large variety of plants that includes arabidopsis thaliana. this review summarizes recent studies that have exploited the compatible interac ... | 2013 | 23847627 |
| elevated co2 increases the abundance of the peach aphid on arabidopsis by reducing jasmonic acid defenses. | rising atmospheric co2 concentrations can affect the induced defense of plants against herbivory by chewing insects, but little is known about whether elevated co2 can change the inducible defense of plants against herbivory by aphids, which are phloem-sucking rather than tissue-chewing insects. interactions between the green peach aphid myzus persicae and four isogenic arabidopsis thaliana genotypes including wild type and three induced defense pathway deficient mutants were examined under ambi ... | 2013 | 23849120 |
| divergence of host range and biological properties between natural isolate and full-length infectious cdna clone of the beet mild yellowing virus 2itb. | plant infection by poleroviruses is restricted to phloem tissues, preventing any classical leaf rub inoculation with viral rna or virions. efficient virus inoculation to plants is achieved by viruliferous aphids that acquire the virus by feeding on infected plants. the use of promoter-driven infectious cdna is an alternative means to infect plants and allows reverse genetic studies to be performed. using beet mild yellowing virus isolate 2itb (bmyv-2itb), we produced a full-length infectious cdn ... | 2014 | 23855287 |
| the occurrence of two species of entomophthorales (entomophthoromycota), pathogens of sitobion avenae and myzus persicae (hemiptera: aphididae), in tunisia. | the natural occurrence of entomophthoralean fungi pathogenic towards aphids on cereal and potato crops was investigated in the years 2009, 2010, and 2011. infected aphids were sampled in three bioclimatic zones in tunisia (beja, cap bon, and kairouan) and fungal species were determined based on morphological characters such as shape, size, and number of nuclei in the primary conidia. polymerase chain reaction (pcr) on the internal transcribed spacer 1 region (its1) was used to verify morphologic ... | 2013 | 23862158 |
| 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 |
| metabolic engineering of raffinose-family oligosaccharides in the phloem reveals alterations in carbon partitioning and enhances resistance to green peach aphid. | many plants employ energized loading strategies to accumulate osmotically-active solutes into the phloem of source organs to accentuate the hydrostatic pressure gradients that drive the flow of water, nutrients and signals from source to sinks. proton-coupled symport of sugars from the apoplasm into the phloem symplasm is the best studied phloem-loading mechanism. as an alternative, numerous species use a polymer trapping mechanism to load through symplasm: sucrose enters the phloem through spec ... | 2013 | 23882277 |
| volatile exchange between undamaged plants - a new mechanism affecting insect orientation in intercropping. | changes in plant volatile emission can be induced by exposure to volatiles from neighbouring insect-attacked plants. however, plants are also exposed to volatiles from unattacked neighbours, and the consequences of this have not been explored. we investigated whether volatile exchange between undamaged plants affects volatile emission and plant-insect interaction. consistently greater quantities of two terpenoids were found in the headspace of potato previously exposed to volatiles from undamage ... | 2013 | 23922710 |
| electrical penetration graph studies to investigate the effects of cyantraniliprole on feeding behavior of myzus persicae (hemiptera: aphididae) on capsicum annuum. | the anthranilic diamide insecticide cyantraniliprole has been shown to suppress aphid and whitefly populations as well as reduce transmission of plant viruses by thrips and whiteflies when taken up systemically by the plant. in this study, electrical penetration graphing (epg) was used to compare effects of cyantraniliprole on feeding behavior of myzus persicae with those of the neonicotinoid insecticide imidacloprid applied as a soil drench to pepper plants two-, six-, and ten-days post-treatme ... | 2014 | 23943625 |
| plant-mediated rnai of a gap gene-enhanced tobacco tolerance against the myzus persicae. | plant-mediated rnai has been developed as a powerful weapon in the fight against agricultural insect pests. the gap gene hunchback (hb) is of crucial importance in insect axial patterning and knockdown of hb is deforming and lethal to the next generation. the peach potato aphid, myzus persicae (sulzer), has many host plants and can be found throughout the world. to investigate the effect of plant-mediated rnai on control of this insect, the hb gene in m. persicae was cloned, plant rnai vector wa ... | 2014 | 23949691 |
| overexpression of irm1 enhances resistance to aphids in arabidopsis thaliana. | aphids are insects that cause direct damage to crops by the removal of phloem sap, but more importantly they spread devastating viruses. aphids use their sophisticated mouthpart (i.e. stylet) to feed from the phloem sieve elements of the host plant. to identify genes that affect host plant resistance to aphids, we previously screened an arabidopsis thaliana activation tag mutant collection. in such mutants, tagged genes are overexpressed by a strong 35s enhancer adjacent to the natural promoter, ... | 2013 | 23951039 |
| comparative analysis of solanum stoloniferum responses to probing by the green peach aphid myzus persicae and the potato aphid macrosiphum euphorbiae. | plants protect themselves against aphid attacks by species-specific defense mechanisms. previously, we have shown that solanum stoloniferum schlechtd has resistance factors to myzus persicae sulzer (homoptera: aphididae) at the epidermal/mesophyll level that are not effective against macrosiphum euphorbiae thomas (homoptera: aphididae). here, we compare the nymphal mortality, the pre-reproductive development time, and the probing behavior of m. persicae and m. euphorbiae on s. stoloniferum and s ... | 2013 | 23955861 |
| encounters with aphid predators or their residues impede searching and oviposition by the aphid parasitoid aphidius ervi (hymenoptera: aphidiinae). | intraguild predation (igp) can be an important factor influencing the effectiveness of aphid natural enemies in biological control. in particular, aphid parasitoid foraging could be influenced by the presence of predators. this study investigated the effect of larvae of the predatory hoverfly episyrphus balteatus degeer (diptera: syrphidae) and the multicolored asian ladybird harmonia axyridis pallas (coleoptera: coccinellidae) on the foraging behavior of the aphid parasitoid, aphidius ervi hali ... | 2014 | 23955963 |
| optimization of solid-state fermentation for improved conidia production of beauveria bassiana as a mycoinsecticide. | the production of conidia of entomopathogenic beauveria bassiana by solid-state fermentation was studied for the development of a biocontrol agent against aphid myzus persicae. the optimal conditions for conidia production on polished white rice were 40% moisture content, 25℃ culture temperature, 2-day-old seeding culture grown in 3% corn meal, 2% rice bran, 2% corn steep powder medium, initial conidia concentration of 10(7) conidia/g in the wet rice, 10% inoculum size, and use of a polyethylene ... | 2010 | 23956642 |
| detecting the presence of target-site resistance to neonicotinoids and pyrethroids in italian populations of myzus persicae. | myzus persicae is a key pest of peach, which in commercial orchards is mainly controlled by chemical treatments. neonicotinoids represent the main control strategy, but resistance monitoring programmes in southern europe have shown the widespread presence of populations highly resistant to this insecticide class in peach orchards. moreover, in italy reports of neonicotinoid application failures are increasing. this work describes the status of the main target-site mutations associated with neoni ... | 2014 | 23963887 |
| belowground induction by delia radicum or phytohormones affect aboveground herbivore communities on field-grown broccoli. | induced plant defence in response to phytophagous insects is a well described phenomenon. however, so far little is known about the effect of induced plant responses on subsequently colonizing herbivores in the field. broccoli plants were induced in the belowground compartment using (i) infestation by the root-herbivore delia radicum, (ii) root application of jasmonic acid (ja) or (iii) root application of salicylic acid (sa). the abundance of d. radicum and six aboveground herbivores displaying ... | 2013 | 23970888 |
| mp10 and mp42 from the aphid species myzus persicae trigger plant defenses in nicotiana benthamiana through different activities. | aphids are phloem-feeding insects that, like other plant parasites, deliver effectors inside their host to manipulate host responses. the myzus persicae (green peach aphid) candidate effectors mp10 and mp42 were previously found to reduce aphid fecundity upon intracellular transient overexpression in nicotiana benthamiana. we performed functional analyses of these proteins to investigate whether they activate defenses through similar activities. we employed a range of functional characterization ... | 2014 | 24006884 |
| population dynamics of three aphid species (hemiptera: aphididae) on four ipomoea spp. infected or noninfected with sweetpotato potyviruses. | three aphid species, aphis gossypii glover and myzus persicae (sulzer) (efficient sweetpotato potyvirus vectors) and rhopalosiphum padi (l.) (an inefficient vector), are commonly found in sweet potato, ipomoea batatas (l.), in louisiana. field-grown sweet potatoes are naturally infected with several potyviruses: sweet potato feathery mottle virus, sweet potato virus g, and sweet potato virus 2. thus, these aphids commonly encounter virus-infected hosts. what is not known is how each of these aph ... | 2013 | 24020267 |
| a repellent net as a new technology to protect cabbage crops. | floating row covers or insect-proof nets with fine mesh are effective at protecting vegetable crops against aphids but negatively impact plant health, especially under warm conditions. furthermore, in control of cabbage insect pests, aphid parasitoids cannot enter the fine-mesh nets, leading to frequent aphid outbreaks. to surmount these difficulties, a 40-mesh-size repellent net treated with alphacypermethrin was studied in laboratory and field tests. results showed both irritant and repellent ... | 2013 | 24020284 |
| dramatic changes in the genotypic frequencies of target insecticide resistance in french populations of myzus persicae (hemiptera: aphididae) over the last decade. | in 2001, although target site resistance against pyrethroids was wide-spread in clonal populations of myzus persicae on oilseed rape in france (kdr), target site resistance against carbamates was rare. starting in 2005, control failure by carbamates appeared. the current study was designed to document changes in insecticide-resistant genotype frequencies in france during the last decade. two resistant genotypes (rgs) were dominant in populations in 2009-2010: rg1 with the kdr 1014f allele (16%), ... | 2013 | 24020301 |
| winter prevalence of obligate aphid pathogen pandora neoaphidis mycosis in the host myzus persicae populations in southern china: modeling description and biocontrol implication. | pandora neoaphidis overwintering had been investigated by monitoring its prevalence in myzus persicae populations in open fields. cabbage plants in field plots were weekly taken after mycosis initiation, to count and examine the living and dead aphids infected by p. neoaphidis . based on the field data, infection levels ( i) varied with field temperature (t), relative humidity (rh) and aphid count (numbers of living aphids per plant, n) over days ( d), fitting well to the modified logistic equat ... | 2012 | 24031835 |
| aphids (hemiptera, aphididae) on ornamental plants in greenhouses in bulgaria. | investigations on the species composition and host range of aphids on ornamental greenhouse plants in bulgaria was conducted over a period of five years, from 2008 to 2012. twenty greenhouses, growing ornamentals for landscaping, plant collections and other purposes were observed. they were located in the regions of sofia, plovdiv, smolyan, pavlikeni, varna and burgas. the total number of collected aphid samples was 279. their composition included 33 aphid species and one subspecies from 13 gene ... | 2013 | 24039530 |
| transgenerational shifts in reproduction hormesis in green peach aphid exposed to low concentrations of imidacloprid. | hormesis is a biphasic phenomenon that in toxicology is characterized by low-dose stimulation and high-dose inhibition. it has been observed in a wide range of organisms in response to many chemical stressors, including insects exposed to pesticides, with potential repercussions for agriculture and pest management. to address questions related to the nature of the dose-response and potential consequences on biological fitness, we examined transgenerational hormesis in the green peach aphid, myzu ... | 2013 | 24040272 |
| interaction of phytophagous insects with salmonella enterica on plants and enhanced persistence of the pathogen with macrosteles quadrilineatus infestation or frankliniella occidentalis feeding. | recently, most foodborne illness outbreaks of salmonellosis have been caused by consumption of contaminated fresh produce. yet, the mechanisms that allow the human pathogen salmonella enterica to contaminate and grow in plant environments remain poorly described. we examined the effect of feeding by phytophagous insects on survival of s. enterica on lettuce. larger s. enterica populations were found on leaves infested with macrosteles quadrilineatus. in contrast, pathogen populations among plant ... | 2013 | 24205384 |
| gene amplification and microsatellite polymorphism underlie a recent insect host shift. | host plant shifts of herbivorous insects may be a first step toward sympatric speciation and can create new pests of agriculturally important crops; however, the molecular mechanisms that mediate this process are poorly understood. certain races of the polyphagous aphid myzus persicae have recently adapted to feed on tobacco (myzus persicae nicotianae) and show a reduced sensitivity to the plant alkaloid nicotine and cross-resistance to neonicotinoids a class of synthetic insecticides widely use ... | 2013 | 24218582 |
| enhanced methanol production in plants provides broad spectrum insect resistance. | plants naturally emit methanol as volatile organic compound. methanol is toxic to insect pests; but the quantity produced by most of the plants is not enough to protect them against invading insect pests. in the present study, we demonstrated that the over-expression of pectin methylesterase, derived from arabidopsis thaliana and aspergillus niger, in transgenic tobacco plants enhances methanol production and resistance to polyphagous insect pests. methanol content in the leaves of transgenic pl ... | 2013 | 24223989 |
| shallot aphids, myzus ascalonicus, in strawberry: biocontrol potential of three predators and three parasitoids. | the parasitization capacity of 3 parasitoids and the predation capacity of 3 predators towards the shallot aphid, myzus ascalonicus doncaster (homoptera: aphididae), on strawberry, fragaria x ananassa duchesne (rosales: rosaceae) cv. honeoye, were examined in laboratory experiments. in petri dish assays, both aphidius colemani viereck (hymenoptera: aphidiidae) and a. ervi haliday readily stung shallot aphids, with no significant difference in stinging frequency between the two species. a. ervi i ... | 2013 | 24224712 |
| within-plant variation in concentrations of amino acids, sugar, and sinigrin in phloem sap of black mustard,brassica nigra (l.) koch (cruciferae). | although within-plant variation in the nutrient and allelochemical composition of phloem sap has been invoked to explain patterns of host use by phloem-feeding insects, little is known about within-plant variation in phloem chemistry. here i describe a new technique in which i use the green peach aphid,myzus persicae sulz., to investigate within-plant variation in the concentrations of chemicals in the phloem sap of black mustard,brassica nigra (l.) koch (cruciferae). relationships between the c ... | 1996 | 24225933 |
| transfer of resistance to plrv titer buildup from solanum etuberosum to a tuber-bearing solanum gene pool. | hybrids between solanum etuberosum and s. pinnatisectum harboring resistance to titer buildup of potato leafroll virus (plrv) were reciprocally crossed with tuber-bearing wild species s. acaule and s. verrucosum. a total of 47 hybrids with acaule were obtained with the aid of embryo rescue and sterile culturing of embryos from imbibing seeds. all but two hybrids with acaule had low pollen stainabilities or were pollen sterile. hybrid seeds from crosses with verrucosum were easily obtained, and t ... | 1988 | 24231994 |
| sucrose esters of carboxylic acids in glandular trichomes ofsolanum berthaultii deter settling and probing by green peach aphid. | removal of type b trichome exudate fromsolanum berthaultii leaflets leads to a decrease in tarsal gumming and mortality and an increase in feeding by the green peach aphid,myzus persicae. type b trichome exudate of thes. berthaultii accession pi 473331 is composed of a complex of 3',3,4,6-tetra-o-acyl sucroses containing primarily short-chain branched carboxylic acids. the acyl constituents are primarily derived from 2-methylpropanoic, 2-methylbutyric, and 8-methylnonanoic acids but constituents ... | 1990 | 24263505 |
| honeydew analysis for detecting phloem transport of plant natural products : implications for host-plant resistance to sap-sucking insects. | analysis of honeydew excreted by various sap-sucking insects indicated the presence of certain plant secondary constituents in the phloem of their host plants. honeydew excreted by mealybugs (pseudococcus longispinus), living oncastanospermum australe, contained the indolizidine alkaloid castanospermine, a potent β-glucosidase inhibitor. similarly, honeydew from green peach aphids (myzus persicae), feeding onsenecio vulgaris flower buds, contained the pyrrolizidine alkaloid senecionine, itsn-oxi ... | 1990 | 24263993 |
| investigating nicotinic acetylcholine receptor expression in neonicotinoid resistant myzus persicae frc. | the peach-potato aphid myzus persicae is a pest of many commercial crops due to its polyphagous nature of feeding and has a well-documented history of acquiring resistance to insecticides. in 2009 a strain (m. persicae frc) emerged in southern france with a point mutation (r81t) at the nicotinic acetylcholine receptor (nachr), the target site for neonicotinoids such as imidacloprid. this point mutation was associated with the loss of the high affinity imidacloprid binding site (pm kd), with the ... | 2013 | 24267690 |
| preference by a virus vector for infected plants is reversed after virus acquisition. | pathogens and their vectors can interact either directly or indirectly via their shared hosts, with implications for the persistence and spread of the pathogen in host populations. for example, some plant viruses induce changes in host plants that cause the aphids that carry these viruses to settle preferentially on infected plants. furthermore, relative preference by the vector for infected plants can change to a preference for noninfected plants after virus acquisition by the vector, as has re ... | 2014 | 24269348 |
| differential inhibition by castanospermine of various insect disaccharidases. | the indolizidine alkaloid, castanospermine (1,6,7,8-tetrahydroxy-octahydroindolizidine-a stereochemical mimic of glucose found in the australian legumecastanospermum australe), differentially inhibited cellobiose, lactose, maltose, sucrose, and trehalose hydrolyzing enzymes from a broad taxonomic spectrum of insects (19 species from 12 different families). it was a potent inhibitor of cellobiase activity of all insects tested (50% inhibition at <3.2 × 10(-5) m castanospermine). with one exceptio ... | 1987 | 24302343 |
| toxin delivery by the coat protein of an aphid-vectored plant virus provides plant resistance to aphids. | the sap-sucking insects (order hemiptera), including aphids, planthoppers, whiteflies and stink bugs, present one of the greatest challenges for pest management in global agriculture. insect neurotoxins offer an alternative to chemical insecticides for controlling these pests, but require delivery into the insect hemocoel. here we use the coat protein of a luteovirus, an aphid-vectored plant virus, to deliver a spider-derived, insect-specific toxin that acts within the hemocoel. the luteovirid c ... | 2014 | 24316580 |
| un-nesting dna russian dolls - the potential for constructing food webs using residual dna in empty aphid mummies. | constructing food-web assemblages comprising parasitoid wasps involves large field collections of hosts followed by labour-intensive rearing of the insects to evaluate the rates of parasitism along with morphological or molecular identification of the parasitoid species. this article presents research towards a new molecular method for the practical and accurate construction of aphid-based food webs. we hypothesize that parasitoid and hyperparasitoid dna left inside aphid mummies after emergence ... | 2014 | 24341932 |
| a trio of viral proteins tunes aphid-plant interactions in arabidopsis thaliana. | virus-induced deterrence to aphid feeding is believed to promote plant virus transmission by encouraging migration of virus-bearing insects away from infected plants. we investigated the effects of infection by an aphid-transmitted virus, cucumber mosaic virus (cmv), on the interaction of arabidopsis thaliana, one of the natural hosts for cmv, with myzus persicae (common names: 'peach-potato aphid', 'green peach aphid'). | 2013 | 24349433 |
| interference with jasmonic acid-regulated gene expression is a general property of viral suppressors of rna silencing but only partly explains virus-induced changes in plant-aphid interactions. | the cucumber mosaic virus (cmv) 2b viral suppressor of rna silencing (vsr) inhibits host responses to jasmonic acid (ja), a chemical signal regulating resistance to insects. previous experiments with a cmv subgroup ia strain and its 2b gene deletion mutant suggested that vsrs might neutralize aphid (myzus persicae) resistance by inhibiting ja-regulated gene expression. to further investigate this, we examined ja-regulated gene expression and aphid performance in nicotiana benthamiana infected wi ... | 2014 | 24362960 |
| comparative analysis of genome sequences from four strains of the buchnera aphidicola mp endosymbion of the green peach aphid, myzus persicae. | myzus persicae, the green peach aphid, is a polyphagous herbivore that feeds from hundreds of species of mostly dicot crop plants. like other phloem-feeding aphids, m. persicae rely on the endosymbiotic bacterium, buchnera aphidicola (buchnera mp), for biosynthesis of essential amino acids and other nutrients that are not sufficiently abundant in their phloem sap diet. tobacco-specialized m. persicae are typically red and somewhat distinct from other lineages of this species. to determine whethe ... | 2013 | 24365332 |
| interactions between the jasmonic and salicylic acid pathway modulate the plant metabolome and affect herbivores of different feeding types. | the phytohormones jasmonic acid (ja) and salicylic acid (sa) mediate induced plant defences and the corresponding pathways interact in a complex manner as has been shown on the transcript and proteine level. downstream, metabolic changes are important for plant-herbivore interactions. this study investigated metabolic changes in leaf tissue and phloem exudates of plantago lanceolata after single and combined ja and sa applications as well as consequences on chewing-biting (heliothis virescens) a ... | 2014 | 24372400 |
| the nia-pro protein of turnip mosaic virus improves growth and reproduction of the aphid vector, myzus persicae (green peach aphid). | many plant viruses depend on aphids and other phloem-feeding insects for transmission within and among host plants. thus, viruses may promote their own transmission by manipulating plant physiology to attract aphids and increase aphid reproduction. consistent with this hypothesis, myzus persicae (green peach aphids) prefer to settle on nicotiana benthamiana infected with turnip mosaic virus (tumv) and fecundity on virus-infected n. benthamiana and arabidopsis thaliana (arabidopsis) is higher tha ... | 2014 | 24372679 |
| comparative analyses of salivary proteins from three aphid species. | saliva is a critical biochemical interface between aphids and their host plants; however, the biochemical nature and physiological functions of aphid saliva proteins are not fully elucidated. in this study we used a multidisciplinary proteomics approach combining liquid chromatography-electrospray ionization tandem mass spectrometry and two-dimensional differential in-gel electrophoresis/matrix-assisted laser desorption/ionization time-of-flight/mass spectrometry to compare the salivary proteins ... | 2014 | 24382153 |
| serological and molecular studies of a novel virus isolate causing yellow mosaic of patchouli [pogostemon cablin (blanco) benth]. | here we have identified and characterized a devastating virus capable of inducing yellow mosaic on the leaves of patchouli [pogostemon cablin (blanco) benth]. the diagnostic tools used were host range, transmission studies, cytopathology, electron microscopy, serology and partial coat protein (cp) gene sequencing. evidence from biological, serological and sequence data suggested that the causal virus belonged to genus potyvirus, family potyviridae. the isolate, designated as patchouli yellow mos ... | 2013 | 24386278 |
| response of solanum tuberosum to myzus persicae infestation at different stages of foliage maturity. | young leaves of the potato solanum tuberosum l. cultivar kardal contain resistance factors to the green peach aphid myzus persicae (sulzer) (hemiptera: aphididae) and normal probing behavior is impeded. however, m. persicae can survive and reproduce on mature and senescent leaves of the cv. kardal plant without problems. we compared the settling of m. persicae on young and old leaves and analyzed the impact of aphids settling on the plant in terms of gene expression. settling, as measured by aph ... | 2014 | 24395750 |
| can invasions occur without change? a comparison of g-matrices and selection in the peach-potato aphid, myzus persicae. | most evolutionary research on biological invasions has focused on changes seen between the native and invaded range for a particular species. however, it is likely that species that live in human-modified habitats in their native range might have evolved specific adaptations to those environments, which increase the likelihood of establishment and spread in similar human-altered environments. from a quantitative genetic perspective, this hypothesis suggests that both native and introduced popula ... | 2013 | 24455140 |
| identification of two acetylcholinesterases in pardosa pseudoannulata and the sensitivity to insecticides. | pardosa pseudoannulata is an important predatory enemy against insect pests, such as rice planthoppers and leafhoppers. in order to understand the insecticide selectivity between p. pseudoannulata and insect pests, two acetylcholinesterase genes, pp-ace1 and pp-ace2, were cloned from this natural enemy. the putative proteins encoded by pp-ace1 and pp-ace2 showed high similarities to insect ache1 (63% to liposcelis entomophila ache1) and ache2 (36% to culex quinquefasciatus ache2) with specific f ... | 2014 | 24463359 |
| a dietary test of putative deleterious sterols for the aphid myzus persicae. | the aphid myzus persicae displays high mortality on tobacco plants bearing a transgene which results in the accumulation of the ketosteroids cholestan-3-one and cholest-4-en-3-one in the phloem sap. to test whether the ketosteroids are the basis of the plant resistance to the aphids, m. persicae were reared on chemically-defined diets with different steroid contents at 0.1-10 µg ml(-1). relative to sterol-free diet and dietary supplements of the two ketosteroids and two phytosterols, dietary cho ... | 2014 | 24465993 |
| cotton photosynthesis-related psak1 protein is involved in plant response to aphid attack. | it is believed that hundreds of genes, including photosynthesis-related genes, are typically involved in plant response to aphid feeding. up to now, however, it is little known on the relationship between the photosynthesis-related genes and plant response to herbivores. in this study, we identified a cotton photosynthesis-related gene (ghpsak1) which belongs to psi-psak family and encodes a putative protein of 162 amino acids. rt-pcr analysis revealed that ghpsak1 transcripts in leaves were inc ... | 2014 | 24469731 |
| genetic diversity and insecticide resistance during the growing season in the green peach aphid (hemiptera: aphididae) on primary and secondary hosts: a farm-scale study in central chile. | the seasonal dynamics of neutral genetic diversity and the insecticide resistance mechanisms of insect pests at the farm scale are still poorly documented. here this was addressed in the green peach aphid myzus persicae (sulzer) (hemiptera: aphididae) in central chile. samples were collected from an insecticide sprayed peach (prunus persica l.) orchard (primary host), and a sweet-pepper (capsicum annum var. grossum l.) field (secondary host). in addition, aphids from weeds (secondary hosts) grow ... | 2014 | 24484894 |
| biological control of aphid using fungal culture and culture filtrates of beauveria bassiana. | aphids are one of the most destructive pests in crop production such as pepper, cucumber, and eggplants. the importance of entomopathogenic fungi as alternative pest control agents is increasing. conidia of entomopathogenic fungi are influenced by environmental conditions, such as temperature and relative humidity, and cause slow and fluctuating mortality. these factors have prevented wider application and use of biocontrol agents. for investigation of means of mitigation of such problems, we co ... | 2013 | 24493943 |
| effects of root herbivory by nematodes on the performance and preference of a leaf-infesting generalist aphid depend on nitrate fertilization. | the performance and behavior of herbivores is strongly affected by the quality of their host plants, which is determined by various environmental conditions. we investigated the performance and preference of the polyphagous shoot-infesting aphid myzus persicae on the host-plant arabidopsis thaliana in a two-factorial design in which nitrate fertilization was varied by 33 %, and the root-infesting cyst-nematode heterodera schachtii was present or absent. aphid performance was influenced by these ... | 2014 | 24500735 |
| pathogenicity of conidia-based preparations of entomopathogenic fungi against the greenhouse pest aphids myzus persicae, aphis gossypii, and aulacorthum solani (hemiptera: aphididae). | seeking new isolates of entomopathogenic fungi with greater virulence against greenhouse aphid pests than those currently registered in north america for control of these insects, single-dose screening assays of 44 selected fungal isolates and 4 commercially available strains were conducted against first-instar nymphs of myzus persicae and aphis gossypii. the assays identified a number of beauveria and metarhizium isolates with virulence equal to or greater than that of the commercial strains ag ... | 2014 | 24583227 |
| the leucine-rich repeat receptor-like kinase brassinosteroid insensitive1-associated kinase1 and the cytochrome p450 phytoalexin deficient3 contribute to innate immunity to aphids in arabidopsis. | the importance of pathogen-associated molecular pattern-triggered immunity (pti) against microbial pathogens has been recently demonstrated. however, it is currently unclear if this layer of immunity mediated by surface-localized pattern recognition receptors (prrs) also plays a role in basal resistance to insects, such as aphids. here, we show that pti is an important component of plant innate immunity to insects. extract of the green peach aphid (gpa; myzus persicae) triggers responses charact ... | 2014 | 24586042 |
| insect mutualisms buffer warming effects on multiple trophic levels. | insect mutualisms can have disproportionately large impacts on local arthropod and plant communities and their responses to climatic change. the objective of this study was to determine if the presence of insect mutualisms affects host plant and herbivore responses to warming. using open-top warming chambers at harvard forest, massachusetts, usa, we manipulated temperature and presence of ants and chaitophorus populicola aphids on populus tremuloides host plants and monitored ant attendance and ... | 2014 | 24649640 |
| suppression of plant defenses by a myzus persicae (green peach aphid) salivary effector protein. | the complex interactions between aphids and their host plant are species-specific and involve multiple layers of recognition and defense. aphid salivary proteins, which are released into the plant during phloem feeding, are a likely mediator of these interactions. in an approach to identify aphid effectors that facilitate feeding from host plants, eleven myzus persicae (green peach aphid) salivary proteins and the groel protein of buchnera aphidicola, a bacterial endosymbiont of this aphid speci ... | 2014 | 24654979 |
| orysata, a jacalin-related lectin from rice, could protect plants against biting-chewing and piercing-sucking insects. | the present study reports the insecticidal activity of orysata, a lectin from rice with mannose specificity, belonging to the family of jacalin-related lectins. the effect of orysata was investigated against three important pest insects in agriculture: the beet armyworm spodoptera exigua hübner (lepidoptera: noctuidae), and two aphid pests: green peach aphid myzus persicae sulzer and pea aphid acyrthosiphon pisum (hemiptera: aphidoidea). bioassays with s. exigua and m. persicae were performed us ... | 2014 | 24656332 |
| interactions among potato genotypes, growth stages, virus strains, and inoculation methods in the potato virus y and green peach aphid pathosystem. | potato virus y (pvy) is an economically important and reemerging potato pathogen in north america. pvy infection reduces yield, and some necrotic and recombinant strains render tubers unmarketable. although pvy(o) is the most prevalent strain in the united states, the necrotic and recombinant strains pvy(ntn) and pvy(n:o) are becoming more widespread. infection rates in aphid-inoculated (myzus persicae (sulzer)) and mechanically inoculated plants were compared across two potato genotypes ('yukon ... | 2014 | 24690278 |
| direct and indirect impacts of infestation of tomato plant by myzus persicae (hemiptera: aphididae) on bemisia tabaci (hemiptera: aleyrodidae). | the impacts of infestation by the green peach aphid (myzus persicae) on sweetpotato whitefly (bemisia tabaci) settling on tomato were determined in seven separate experiments with whole plants and with detached leaves through manipulation of four factors: durations of aphid infestation, density of aphids, intervals between aphid removal after different durations of infestation and the time of whitefly release, and leaf positions on the plants. the results demonstrated that b. tabaci preferred to ... | 2014 | 24710393 |
| rice-straw mulch reduces the green peach aphid, myzus persicae (hemiptera: aphididae) populations on kale, brassica oleracea var. acephala (brassicaceae) plants. | organic mulches, like peel and rice-straw, besides other materials affect the uv and temperature, which cause a reduction in the aphid arrival. the aim was to evaluate the effect of covering the soil with straw on the populations of the green peach aphid, myzus persicae on the kale, brassica oleracea var. acephala plants. the first experiment evaluated the direct effect of the rice-straw mulch and the second its indirect effect on aphid immigration, testing the plant characteristics that could l ... | 2014 | 24714367 |
| movement of cyantraniliprole in plants after foliar applications and its impact on the control of sucking and chewing insects. | given the physical properties of insecticides, there is often some movement of these compounds within crop plants following foliar application. in this context, movement of two formulations of cyantraniliprole, an anthranilic diamide, was characterized for translocation to new growth, distribution within a leaf and penetration through the leaf cuticle. | 2015 | 24771486 |
| stylet penetration behaviors of myzus persicae (hemiptera: aphididae) on four ipomoea spp. infected or noninfected with sweet potato potyviruses. | myzus persicae (sulzer) is an efficient vector of potyviruses in sweet potato, ipomoea batatas (l.). these potyviruses also infect members of the morning glory family ipomoea cordatotriloba dennstedt and ipomoea hederacea jacqin commonly found within or around sweet potato fields. infection of sweet potato with potyviruses increases the intrinsic rate of increase of m. persicae. thus, from the epidemiological stand point, virus infection can modify vector population dynamics, and therefore incre ... | 2014 | 24772532 |
| draft genome sequences of two bacillus thuringiensis strains and characterization of a putative 41.9-kda insecticidal toxin. | in this work, we report the genome sequencing of two bacillus thuringiensis strains using illumina next-generation sequencing technology (ngs). strain hu4-2, toxic to many lepidopteran pest species and to some mosquitoes, encoded genes for two insecticidal crystal (cry) proteins, cry1ia and cry9ea, and a vegetative insecticidal protein (vip) gene, vip3ca2. strain leapi01 contained genes coding for seven cry proteins (cry1aa, cry1ca, cry1da, cry2ab, cry9ea and two cry1ia gene variants) and a vip3 ... | 2014 | 24784323 |
| plant-generated artificial small rnas mediated aphid resistance. | rna silencing is an important mechanism for regulation of endogenous gene expression and defense against genomic intruders in plants. this natural defense system was adopted to generate virus-resistant plants even before the mechanism of rna silencing was unveiled. with the clarification of that mechanism, transgenic antiviral plants were developed that expressed artificial virus-specific hairpin rnas (hprnas) or micrornas (amirnas) in host plants. previous works also showed that plant-mediated ... | 2014 | 24819752 |
| the evolution of insecticide resistance in the peach potato aphid, myzus persicae. | the peach potato aphid, myzus persicae is a globally distributed crop pest with a host range of over 400 species including many economically important crop plants. the intensive use of insecticides to control this species over many years has led to populations that are now resistant to several classes of insecticide. work spanning over 40 years has shown that m. persicae has a remarkable ability to evolve mechanisms that avoid or overcome the toxic effect of insecticides with at least seven inde ... | 2014 | 24855024 |
| glycoalkaloids of wild and cultivated solanum: effects on specialist and generalist insect herbivores. | plant domestication by selective breeding may reduce plant chemical defense in favor of growth. however, few studies have simultaneously studied the defensive chemistry of cultivated plants and their wild congeners in connection to herbivore susceptibility. we compared the constitutive glycoalkaloids (gas) of cultivated potato, solanum tuberosum, and a wild congener, s. commersonii, by liquid chromatography coupled to mass spectrometry. we also determined the major herbivores present on the two ... | 2014 | 24863489 |
| groel from the endosymbiont buchnera aphidicola betrays the aphid by triggering plant defense. | aphids are sap-feeding plant pests and harbor the endosymbiont buchnera aphidicola, which is essential for their fecundity and survival. during plant penetration and feeding, aphids secrete saliva that contains proteins predicted to alter plant defenses and metabolism. plants recognize microbe-associated molecular patterns and induce pattern-triggered immunity (pti). no aphid-associated molecular pattern has yet been identified. by mass spectrometry, we identified in saliva from potato aphids (m ... | 2014 | 24927572 |
| botrytis-induced kinase1 modulates arabidopsis resistance to green peach aphids via phytoalexin deficient4. | botrytis-induced kinase1 (bik1) plays important roles in induced defense against fungal and bacterial pathogens in arabidopsis (arabidopsis thaliana). its tomato (solanum lycopersicum) homolog is required for host plant resistance to a chewing insect herbivore. however, it remains unknown whether bik1 functions in plant defense against aphids, a group of insects with a specialized phloem sap-feeding style. in this study, the potential role of bik1 was investigated in arabidopsis infested with th ... | 2014 | 24963070 |