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Showing 1 to 18 of 18 for “"rhopalosiphum padi"”.
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Induced Walking Behavior of Rhopalosiphum Padi L. (Homoptera: Aphididae)
Movement of apterous adults and fourth instar nymphs was monitored following different perturbations and combination of perturbations. Apterous aphids, caged overnight on oat plants in a 25-plant infestation focus in the center of each 900-plant plot, were subjected to a given perturbation or …
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Early Season Population Dynamics and Residual Insecticide Effects on Bird Cherry-oat Aphid, Rhopalosiphum padi in Arkansas Winter Wheat
<p>Bird cherry-oat aphid is a common pest of Arkansas winter wheat. This aphid vectors barley yellow dwarf virus which may cause extensive crop damage and yield loss when wheat is infested by virulent aphids in the fall. Some suggest this damage may be avoided using insecticide seed treatments if …
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Control of barley yellow dwarf virus (BYDV) in oat and wheat and identification of a RAPD marker associated with BYDV tolerance in oat
… F$\sb3$ generations, using viruliferous aphids (Rhopalosiphum padi L.). These subpopulations were compared to uninoculated subpopulations. Inoculation did not increase the frequency of BYDV tolerant genotypes in the four crosses studied.
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Mixed infections of maize dwarf mosaic virus and cucumber mosaic virus in maize
… non-persistently transmitted by Myzus persicae, Rhopalosiphum padi and Rhopalosipbum maidis aphids. Protoplasts were isolated from maize seedlings and could be viably maintained for up to 66 hours. The maize protoplasts were infected with CMV and MDMV either singly, or together as a mixed …
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TRACKING PLANT VIRUS INFECTIONS THROUGH MULTIPLE DIMENSIONS: A SEARCH FOR SOURCES OF NONPERSISTENT VIRUS VECTORS AND RESERVOIRS AT LOCAL AND REGIONAL SCALES
… associated with PRSV, and Aphis nerii with WMV. Rhopalosiphum padi was negatively associated with WMV. No relationship between total aphid or noncolonizing species counts was found with virus infection, and an increase in total colonizing species (Aphis gossypii) trapped in fields predicted a …
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Epidemiology, Aphid Vectors, Impact and Management of Tobacco Etch Potyvirus in Hot Peppers in Jamaica
… (Thomas), Lipaphis erysimi Hille Ris Lambers, Rhopalosiphum padi (Linnaeus), Schizaphis graminum (Rondani), Schizaphis rotundiventris (Signoret), Trichosiphonaphis poligoni (van der Goot), Uroleucon ambrosiae complex (Thomas) and Uroleucon pseudoambrosiae (Olive). A. amaranthi and U. ambrosiae …
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The Effect of Within-host Virus Population Growth and Interspecific Competition on Aphid Transmission and Population Structure of Barley Yellow Dwarf Virus
… in the transmission efficiency of PAV and PAS by Rhopalosiphum padi from singly infected plants at 30 DPI. But when transmission assays were performed 60 DPI, the transmission success of PAV was significantly greater than that of PAS. The greater transmission efficiency of PAV at late stages of …
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Aphid Transmission, Replication, and Transcription of BYDV -Pav -Il and Genome Organization of RhPV
… and replication of the BYDV-PAV genome. A Rhopalosiphum padi cDNA expression library was screened to identify aphid proteins that interact with the BYDV-PAV-IL capsid proteins using the yeast two-hybrid system. Seven clones activated the expression of the reporter genes, supposedly by …
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Dynamics of the sweetpotato potyvirus aphid pathosystem in Louisiana
… the entire crop cycle, and A. gossypii and Rhopalosiphum padi, were the most abundant species occurring throughout the growing season. Virus infection of sentinel plants occurred mainly during the months of June to August when virus titers were high in sweetpotato plants. SPFMV was more …
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Understanding molecular events during barley aphid interactions
… found that the barley specialist Rhopalosiphum padi and the broad host range Myzus persicae showed differences in colonization, settlement and probing-behaviour on barley. Analyses of barley transcriptional responses revealed gene sets differentially regulated upon the different …
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The effect of aphid lethal paralysis virus (ALPV) on the biology of grain aphids in the Western Cape
… in muscle fibres or mitochondria. ALPV and Rhopalosiphum padi virus (RhPV) are transmitted transovarially. Different incidences of transmissions of ALPV were obtained for R. padi (2996) and Sitobion avenae (1696) and ALPV infections dramatically reduced the longevity and fecundity of these …
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Physiological and Morphological Responses to Drought Stress in Different Cultivation Environments in Wild Type and ABA-deficient Barley
… and herbivory by the sap-sucking aphid herbivore Rhopalosiphum padi and the chewing mollusc herbivore Cornu aspersum. I particularly focus on the role of abscisic acid (ABA), a key phytohormone in plant-stress responses, in coordinating plant responses to these stresses in different cultivation …
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Crop loss in two spring oat cultivars due to Puccinia coronata f.sp. avenae and barley yellow dwarf virus, and a spring oat plant growth model
… plots were infested with viruliferous aphids (Rhopalosiphum padi) and BYDV incidence was determined visually and with TAS-ELISA. CR disease severity was assessed several times, and yield and yield components were determined. Linear critical point regression models were developed for both …
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Russian wheat aphid, Diuraphis noxia (Kurdjomov), ecology and reproduction on five noncultivated grass hosts in high elevation environments
… including Diuraphis frequens, Sipha elegans, Rhopalosiphum padi, Sitobion avenae, and Schizaphis graminum. Sipha elegans was the most abundant aphid collected. The most Russian wheat aphids were collected in June in the trap at 1,655 m, coinciding with peak captures in nearby wheat production. …
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Characterisation of two aphid picorna-like viruses
… (ALPV), was isolated from laboratory-propagated Rhopalosiphum padi aphids co-infected with R. padi virus (RhPV). ALPV and RhPV were separated and ALPV was characterised in detail. Virions are isometric with a diameter of 26 nm, a sedimentation coefficient of 164 Sand a density in CsCl of 1.34 …
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Strategies of Sexual Reproduction in Aphids
… unter verwandten Männchen überwiegt, während bei Rhopalosiphum padi (L.) verwandte Weibchen in stärkerer Konkurrenz zueinander stehen. Dies ist auch plausibel, weil der Lebenszyklus von R. padi die Konkurrenz zwischen verwandten Männchen durch deren Migration verhindert, aber nicht die Konkurrenz …