| ultrastructure of the antennal sensilla of aphids. i. coeloconic and placoid sensilla. | an electron microscopical study was made of the coeloconic and placoid sensilla on the antennae of the aphids aphis pomi, macrosiphum euphorbiae, nasonovia ribis-nigri, and pemphigus bursarius. scanning electron microscopy revealed some variation in morphology which may be functionally important but is more likely to reflect the evolution of these species. the placoid sensilla were shown by tranwo or three neurons is surrounded by two ensheathing cells. the ciliary regions of the dendrites pass ... | 1979 | 519733 |
| a survey of syrphid predators of nasonovia ribisnigri in organic lettuce on the central coast of california. | organic lettuce, lactuca sativa l., producers on california's central coast rely on endemic syrphid flies (diptera: syrphidae) to suppress populations of nasonovia ribisnigri mosley (homoptera: aphididae) and other aphids affecting lettuce. growers are using various forms of habitat manipulation to enhance biological control. we surveyed syrphids collected from organic romaine in and around the salinas valley from march through september 2005 to gain a better understanding of the species respons ... | 2007 | 17370807 |
| temperature thresholds and thermal requirements for development of nasonovia ribisnigri (hemiptera: aphididae). | early detection of nasonovia ribisnigri (mosley) (hemiptera: aphididae) on lettuce is of primary importance for its effective control. temperature thresholds for development of this pest were estimated using developmental rates [r(t)] at different constant temperatures (8, 12, 16, 20, 24, 26, and 28 degrees c). observed developmental rates data and temperature were fitted to two linear (campbell and muñiz and gil) and a nonlinear (lactin) models. lower temperature threshold estimated by the camp ... | 2007 | 17716458 |
| responses of nasonovia ribisnigri (homoptera: aphididae) to susceptible and resistant lettuce. | nymphs and alates of aphid nasonovia ribisnigri (mosley) (homoptera: aphididae) were tested on 10 lettuce cultivars with n. ribisnigri resistance gene nr and 18 cultivars without the resistance gene in various bioassays. bioassays used whole plants, leaf discs, or leaf cages to determine susceptibility of commercial lettuce cultivars to n. ribisnigri infestation and to evaluate screening methods for breeding lettuce resistance to n. ribisnigri. resistant and susceptible plants were separated in ... | 2006 | 16813339 |
| interplant movement and spatial distribution of alate and apterous morphs of nasonovia ribisnigri (homoptera: aphididae) on lettuce. | knowledge on colonization modes and interplant movement of nasonovia ribisnigri can contribute to the development of optimal control of this pest. the aim of this study was to determine the spatio-temporal distribution and the mode of spread between adult morphs of nasonovia ribisnigri, comparing spring and autumn lettuce protected crops. the spatial and temporal pattern was analyzed using the spatial analysis by distance indices (sadie) methodology and other related displacement indices. the po ... | 2012 | 22289142 |
| oxygenated phosphine fumigation for control of nasonovia ribisnigri (homoptera: aphididae) on harvested lettuce. | low temperature regular phosphine fumigations under the normal oxygen level and oxygenated phosphine fumigations under superatmospheric oxygen levels were compared for efficacy against the aphid, nasonovia ribisnigri (mosley), and effects on postharvest quality of romaine and head lettuce. low temperature regular phosphine fumigation was effective against the aphid. however, a 3 d treatment with high phosphine concentrations of > or = 2,000 ppm was needed for complete control of the aphid. oxyge ... | 2012 | 22812116 |
| the development of an economic threshold for nasonovia ribisnigri (hemiptera: aphididae) on lettuce in central spain. | this study reports economic thresholds for the lettuce aphid nasonovia ribisnigri (mosley), based exclusively on cosmetic damage, that is, presence or absence of aphids at harvest time. field trials were conducted in la poveda experimental farm, madrid (spain) during autumn (2004 and 2005) and spring (2005 and 2006). plants were arranged in plots and just before the formation of lettuce hearts they were infested with different densities of n. ribisnigri. two days later, half of each plot was tre ... | 2013 | 23786079 |
| disappearance of dimethoate, methamidophos and pirimicarb in lettuce. | foliar sprays of dimethoate at 150 or 300 g a.i./ha, methamidophos at 450 or 900 g a.i./ha and pirimicarb at 140 or 280 g a.i./ha were applied for control of the green peach aphid, myzus pericae (sulzer), and the lettuce aphid, nasonovia ribisnigri ( mosley ), about 2 weeks before the lettuce started heading, and again about 1 week from harvest. in lettuce, dimethoate partially oxidized to its oxon and pirimicarb converted to its methylamino- and/or formyl methylamino-analogues. most residues we ... | 1984 | 6736564 |
| parasitization of commercially available parasitoid species against the lettuce aphid, nasonovia ribisnigri (hemiptera: aphididae). | the lettuce aphid, nasonovia ribisnigri (mosley), is an economically important pest of lettuce worldwide. little documentation exists for the control efficacy of aphid parasitoids against n. ribisnigri. this laboratory study evaluated three commercially available parasitoid species: aphidius colemani (viereck), lysiphlebus testaceipes (cresson), and aphelinus abdominalis (dalman) for their mortality impact on n. ribisnigri. the green peach aphid myzus persicae (sulzer) was included as a referenc ... | 2014 | 25290653 |
| synergy between chemical and biological control in the ipm of currant-lettuce aphid (nasonovia ribisnigri) in canterbury, new zealand. | field trials were conducted at four canterbury, new zealand locations in 2005-06 to determine if the synergistic effects of biological control by natural enemies and standard drenching techniques controlled lettuce aphid populations throughout the entire growing season. chemical usage significantly lowered aphid densities in the outer, wrapper and heart leaves compared to control plants at most times. however, in mid-summer, natural enemies, such as the brown lacewing (micromus tasmaniae), 11-sp ... | 2010 | 19573253 |
| the green lacewing, chrysoperla carnea: preference between lettuce aphids, nasonovia ribisnigri, and western flower thrips, frankliniella occidentalis. | this study investigated the prey preference of 3(rd) instar green lacewing, chrysoperla carnea stephens (neuroptera: chrysopidae), between western flower thrips, frankliniella occidentalis (pergande) (thysanoptera: thripidae), and lettuce aphids, nasonovia ribisnigri (mosley) (hemiptera: aphididae) in laboratory experiments at 25 ± 1° c and 70 ± 5% rh with five prey ratios (10 aphids:80 thrips, 25 aphids:65 thrips, 45 aphids:45 thrips, 65 aphids:25 thrips, and 80 aphids:10 thrips). third instar ... | 2013 | 24205864 |
| nitric oxide as a potent fumigant for postharvest pest control. | there is a great demand for safe and effective alternative fumigants to replace methyl bromide and other toxic fumigants for postharvest pest control. nitric oxide, a common signal molecule in biological systems, was found to be effective and safe to control insects under ultralow oxygen conditions. four insect species including western flower thrips, frankliniella occidentalis (pergande) (thysanoptera thripidae); aphid, nasonovia ribisnigri (mosley) (homoptera: aphididae); confused flour beetle ... | 2013 | 24498723 |
| role of the aphid species and their feeding locations in parasitization behavior of aphelinus abdominalis, a parasitoid of the lettuce aphid nasonovia ribisnigri. | aphid species feeding on lettuce occupy distinct feeding sites: the lettuce aphid nasonovia ribisnigri prefers to feed on heart leaves, whereas the potato aphid macrosiphum euphorbiae feeds only on outer leaves. the aphid parasitoid aphelinus abdominalis, known to be able to regulate m. euphorbiae on many crops, has recently been indicated as a promising biocontrol candidate also for use against n. ribisnigri, a major pest of lettuce. this study therefore examined a. abdominalis parasitization p ... | 2017 | 28854232 |
| effects of vacuum and controlled atmosphere treatments on insect mortality and lettuce quality. | laboratory studies were conducted to determine the effects of vacuum and controlled atmosphere on mortality of aphids, nasonovia ribisnigri (mosley) and macrosiphum euphorbiae (thomas), and leafminer, liriomyza langei frick, and on the visual quality of iceberg lettuce at three different temperatures. vacuum at 50 mbar and controlled atmosphere with 6% co2 were effective in controlling aphids and leafminer larvae. complete control of n. ribisnigri and m. euphorbiae was achieved with vacuum treat ... | 2003 | 14503580 |
| ultralow oxygen treatment for postharvest control of nasonovia ribisnigri (homoptera: aphididae) on iceberg lettuce. | the aphid nasonovia ribisnigri (mosley) is a common pest of lettuce in the united states. it hinders export of u.s. lettuce to the overseas market such as japan where it is a quarantined pest. ultralow oxygen treatments were studied for control of the insect on iceberg lettuce. small-scale ultralow oxygen treatments in plastic jars were conducted at 1, 5, and 10 degrees c for different durations to determine effective treatment against nymphs and alates of n. ribisnigri. at oxygen levels of 0.01 ... | 2005 | 16539111 |
| distribution and population development of nasonovia ribisnigri (homoptera: aphididae) in iceberg lettuce. | a field study was conducted to determine the distribution and development of aphid nasonovia ribisnigri (mosley) (homoptera: aphididae) populations in iceberg lettuce, lactuca sativa l. 'salinas'. lettuce plants were transplanted and caged individually in the field and inoculated with apterous n. ribisnigri at 0, 1, 2, 3, and 4 wk after transplanting in spring and fall 2002. plants were harvested 15-50 d after inoculations; numbers of alates and apterous n. ribisnigri were counted or estimated o ... | 2004 | 15279267 |
| role of syrphid larvae and other predators in suppressing aphid infestations in organic lettuce on california's central coast. | organic lettuce, lactuca sativa l., growers on the central coast of california rely on conservation biological control to manage nasonovia ribisnigri mosley (hemiptera: aphididae) and other aphid pests of lettuce. in 2006, we carried out five replicated field trials to determine the importance of syrphid larvae in the suppression of n. ribisnigri and other aphids infesting organic romaine lettuce. we used entrust, a spinosad-based insecticide approved for use on organic farms, to suppress syrphi ... | 2008 | 18950033 |
| performance and feeding behaviour of two biotypes of the black currant-lettuce aphid, nasonovia ribisnigri, on resistant and susceptible lactuca sativa near-isogenic lines. | the black currant-lettuce aphid, nasonovia ribisnigri, is an important pest of cultivated lettuce, lactuca sativa. since 1982, the control of this aphid on lettuce is largely based on host plant resistance, conferred by the nr gene, introgressed from lactuca virosa. the resistance mechanism remains to be identified. n. ribisnigri populations virulent on the nr-based resistance in lettuce have emerged in several locations in europe since 2007. the objective of this study was to investigate the re ... | 2013 | 23480294 |
| partial aphid resistance in lettuce negatively affects parasitoids. | this study investigated the effects of partial plant resistance on the lettuce aphid nasonovia ribisnigri (mosley) (hemiptera: aphididae), a major pest of cultivated lettuce (lactuca sativa l.), and one of its parasitoids, aphidius ervi haliday (hymenoptera: braconidae). aphids were reared on susceptible (l. sativa variety estival; s) or partially resistant (lactuca serriola l. pi 491093; pr) lettuce, and next parasitized by a. ervi females. fitness proxies were measured for both aphids and para ... | 2014 | 25197882 |
| towards new sources of resistance to the currant-lettuce aphid (nasonovia ribisnigri). | domesticated lettuce varieties encompass much morphological variation across a range of crop type groups, with large collections of cultivars and landrace accessions maintained in genebanks. additional variation not captured during domestication, present in ancestral wild relatives, represents a potentially rich source of alleles that can deliver to sustainable crop production. however, these large collections are difficult and costly to screen for many agronomically important traits. in this pa ... | 2017 | 28111522 |
| paecilomyces niveus stolk & samson, 1971 (ascomycota: thermoascaceae) as a pathogen of nasonovia ribisnigri (mosley, 1841) (hemiptera, aphididae) in brazil. | nasonovia ribisnigri is a key pest of lettuce (lactuca sativa l.) in brazil that requires alternative control methods to synthetic pesticides. we report, for the first time, the occurrence of paecilomyces niveus as an entomopathogen of the aphid nasonovia ribisnigri in pinhais, paraná, brazil. samples of mummified aphids were collected from lettuce crops. the fungus p. niveus (paepr) was isolated from the insect bodies and identified by macro and micromorphology. the species was confirmed by seq ... | 2015 | 26602345 |
| high-throughput phenotyping of plant resistance to aphids by automated video tracking. | piercing-sucking insects are major vectors of plant viruses causing significant yield losses in crops. functional genomics of plant resistance to these insects would greatly benefit from the availability of high-throughput, quantitative phenotyping methods. | 2015 | 25657813 |
| aphid transmission of lettuce necrotic leaf curl virus, a member of a tentative new subgroup within the genus torradovirus. | lettuce necrotic leaf curl virus (lnlcv) was described as the first non-tomato-infecting member of the genus torradovirus. until today, the virus was found only in the netherlands in two different areas in open field crops of lettuce. in 2015, lnlcv was accepted by the ictv as a new member of the genus torradovirus. the tomato-infecting (ti) torradoviruses tomato torrado virus (totv), tomato marchitez virus (tomarv) and tomato chocolàte virus (tochv) are transmitted by at least three whitefly sp ... | 2017 | 28223184 |
| crystal structures and binding dynamics of odorant-binding protein 3 from two aphid species megoura viciae and nasonovia ribisnigri. | aphids use chemical cues to locate hosts and find mates. the vetch aphid megoura viciae feeds exclusively on the fabaceae, whereas the currant-lettuce aphid nasonovia ribisnigri alternates hosts between the grossulariaceae and asteraceae. both species use alarm pheromones to warn of dangers. for n. ribisnigri this pheromone is a single component (e)-β-farnesene but m. viciae uses a mixture of (e)-β-farnesene, (-)-α-pinene, β-pinene, and limonene. odorant-binding proteins (obp) are believed to ca ... | 2016 | 27102935 |
| activity of aphids associated with lettuce and broccoli in spain and their efficiency as vectors of lettuce mosaic virus. | this research sought to identify the aphid virus vector species associated with lettuce and broccoli crops in spain, and to determine their population dynamics and ability to transmit lettuce mosaic virus (lmv). green tile traps and moericke yellow water-pan traps were used to monitor aphid flights during the spring and autumn growing seasons of 2001. aphid species feeding on lettuce were counted weekly. the transmission efficiencies of lmv were determined for the aphid species caught most frequ ... | 2004 | 15036838 |
| new roles for cis-jasmone as an insect semiochemical and in plant defense. | cis-jasmone, or (z)-jasmone, is well known as a component of plant volatiles, and its release can be induced by damage, for example during insect herbivory. using the olfactory system of the lettuce aphid to investigate volatiles from plants avoided by this insect, (z)-jasmone was found to be electrophysiologically active and also to be repellent in laboratory choice tests. in field studies, repellency from traps was demonstrated for the damson-hop aphid, and with cereal aphids numbers were redu ... | 2000 | 10900270 |
| mechanisms of insecticide resistance in the aphid nasonovia ribisnigri (mosley) (homoptera: aphididae) from france. | nasonovia ribisnigri, a main pest of salad crops, has developed resistance to various insecticides in southern france, including the carbamate pirimicarb and the cyclodiene endosulfan, two insecticides widely used to control this aphid. here we have investigated the mechanisms of resistance to these two insecticides by studying cross-resistance, synergism, activity of detoxifying enzymes, and possible modifications of the target proteins. resistance to pirimicarb was shown to be mainly due to a ... | 1999 | 10333576 |
| molecular assessment of predation by hoverflies (diptera: syrphidae) in mediterranean lettuce crops. | hoverflies (diptera: syrphidae) are generalist predators of a great variety of pests. nasonovia ribisnigri (hemiptera: aphididae) and frankliniella occidentalis (thysanoptera: thripidae) are two common pests in mediterranean lettuce crops, where they occur alongside alternative prey (e.g., collembola). a semi-field experiment was conducted in an experimental lettuce plot where hoverfly predation on n. ribisnigri, f. occidentalis and collembola was studied by conventional pcr and qpcr using speci ... | 2015 | 25236922 |
| understanding trophic interactions of orius spp. (hemiptera: anthocoridae) in lettuce crops by molecular methods. | the aphid nasonovia ribisnigri (mosley) (hemiptera: aphididae) and the thrips frankliniella occidentalis (pergande) (thysanoptera: thripidae) are common pests in mediterranean lettuce crops, where orius spp. are common generalist predators. predation by orius spp. was studied in a lettuce plot by conventional polymerase chain reaction (pcr) and real-time pcr analyses using specific primers of both main pests. also, high-throughput sequencing was used to have a wider approach of the diet of these ... | 2016 | 25641943 |