| plum pox in north america: identification of aphid vectors and a potential role for fruit in virus spread. | abstract thirteen aphid species were tested for their ability to transmit pennsylvania isolates of plum pox virus (ppv) collected in columbia (penn-3), franklin (penn-4), and york (penn-7) counties, pa. four species, aphis fabae, a. spiraecola, brachycaudus persicae, and myzus persicae, consistently transmitted ppv in preliminary transmission tests. two species, metopolophium dirhodum and rhopalosiphum padi, were occasional inefficient vectors. toxoptera citricida, from florida, also was an effe ... | 2004 | 18943108 |
| three homopteran pests of citrus as prey for the convergent lady beetle: suitability and preference. | the convergent lady beetle, hippodamia convergens guérin-méneville (coleoptera: coccinellidae), is an important predator of soft-bodied insect pests in many regions of the united states, but generally uncommon in florida citrus. certain citrus producers in florida recently initiated releases of commercially available h. convergens from california against the asian citrus psyllid diaphorina citri kuwayama, vector of huanglongbing or citrus greening disease. however, there is little information o ... | 2011 | 22217767 |
| Permanent Genetic Resources added to Molecular Ecology Resources Database 1 August 2011-30 September 2011. | This article documents the addition of 299 microsatellite marker loci and nine pairs of single-nucleotide polymorphism (SNP) EPIC primers to the Molecular Ecology Resources (MER) Database. Loci were developed for the following species: Alosa pseudoharengus, Alosa aestivalis, Aphis spiraecola, Argopecten purpuratus, Coreoleuciscus splendidus, Garra gotyla, Hippodamia convergens, Linnaea borealis, Menippe mercenaria, Menippe adina, Parus major, Pinus densiflora, Portunus trituberculatus, Procontar ... | 2012 | 22136175 |
| molecular, ultrastructural, and biological characterization of pennsylvania isolates of plum pox virus. | plum pox virus (ppv) was identified in pennsylvania in 1999. the outbreak was limited to a four-county region in southern pennsylvania. initial serological and molecular characterization indicated that the isolates in pennsylvania belong to the d strain of ppv. the pennsylvania isolates were characterized by sequence analysis, electron microscopy, host range, and vector transmission to determine how these isolates related to their previously studied european counterparts. genetically, pennsylvan ... | 2011 | 21261466 |
| intervention thresholds for aphis spiraecola (hemiptera: aphididae) on citrus clementina. | the production of clementine fruit was affected by varying densities of aphis spiraecola patch (hemiptera: aphididae) maintained on four groups of clementine, citrus clementina hort. ex tan., trees individually isolated in mesh cages. a formula relating the number of aphids per square meter of canopy per group of trees to yield loss in that group of trees was obtained, permitting us to calculate the economic injury levels (eils) and economic thresholds (ets) for treatment against a. spiraecola, ... | 2006 | 16937682 |
| aphid (hemiptera: aphididae) species composition and potential aphid vectors of plum pox virus in pennsylvania peach orchards. | plum pox, an invasive disease recently identified in pennsylvania stone fruit orchards, is caused by the aphid-transmitted plum pox virus (genus potyvirus, family potyviridae, ppv). to identify potential vectors, we described the aphid species communities and the seasonal dynamics of the dominant aphid species within pennsylvania peach orchards. aphids were trapped weekly in 2002 and 2003 from mid-april through mid-november within two central pennsylvania orchards by using yellow and green water ... | 2005 | 16334309 |
| estimation of the number of aphids carrying citrus tristeza virus that visit adult citrus trees. | aphid species were counted on citrus trees in orchards in valencia, spain, in the spring and autumn of 1997, 1998 and 1999. moericke yellow water traps, the 'sticky shoot' method and counts of established colonies were used in extensive surveys in which 29,502 aphids were recorded and identified. aphis spiraecola and aphis gossypii were the most abundant aphid species. the numbers of aphid species landing on mature trees of grapefruit, sweet orange, lemon and clementine and satsuma mandarins, we ... | 2004 | 15036840 |
| 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 |
| incidence and epidemiology of citrus tristeza virus in the valencian community of spain. | the first outbreak of citrus tristeza disease in spain caused by citrus tristeza virus (ctv) was recorded in 1957 in the valencian community (vc). in total c. 40 million trees, mainly of sweet orange and mandarin grafted on sour orange rootstocks, declined due to ctv. large-scale surveys in different municipalities of the vc indicated that the disease spread very fast. incidence increased from 11% in 1989 to 53% in 1998. toxoptera aurantii and aphis spiraecola (inefficient aphid vectors of ctv) ... | 2000 | 11137164 |
| properties of a virus causing mosaic and leaf curl disease of celosia argentea l. in nigeria. | a sap transmissible virus, causing mosaic and leaf curl disease of celosia argentea, was isolated at vegetable farms in amuwo odofin, tejuoso, and abule ado, lagos, nigeria. the virus had a restricted host range confined to a few species of the amaranthaceae, chenopodiaceae and solanaceae families. it failed to infect several other species of the aizoaceae, brassicaceae, cucurbitaceae, fabaceae, lamiaceae, malvaceae, poaceae and tiliaceae families. the virus was transmitted in a non-persistent m ... | 1998 | 9842442 |
| detecting aphid predation by earwigs in organic citrus orchards using molecular markers. | aphids (hemiptera: aphidoidea) can damage citrus trees via direct damage to leaves and flowers or via the indirect transmission of viruses. predators such as the european earwig, forficula auricularia linnaeus (dermaptera: forficulidae), may assist in keeping aphid populations under control in citrus orchards. group-specific primers were developed to detect aphid dna in earwigs, in order to determine earwig predation rates in aphids in mediterranean organic citrus trees. these primers were desig ... | 2012 | 22414267 |
| population structure of aphis spiraecola (hemiptera: aphididae) on pear trees in china identified using microsatellites. | the spiraea aphid (aphis spiraecola patch) is a primary pest of fruit trees, particularly pear trees in china. despite the economic importance of this pest, little is known about its genetic structure or its patterns of dispersal at local and regional scales; however, knowledge of these characteristics is important for establishing effective control strategies for this pest. the genetic variability of 431 individuals from 21 populations on pear trees in china was investigated using eight polymor ... | 2012 | 22606830 |
| aphid species affect foraging behavior of coccinella septempunctata (coccinellidae: coleoptera). | flowers are admirable in scenic good looks and artistic beautification. these are also playing necessary roles in therapeutic preparations. aphid is an important sucking pest of various flowers in ornamental territories and it is generally controlled by predators, so it was necessary to evaluate which aphid species affect the predator more or less. | 2017 | 29023008 |
| spatial distribution and sampling plans with fixed level of precision for citrus aphids (hom., aphididae) on two orange species. | aphis spiraecola patch, aphis gossypii glover, and toxoptera aurantii boyer de fonscolombe are three important aphid pests of citrus orchards. in this study, spatial distributions of the aphids on two orange species, satsuma mandarin and thomson navel, were evaluated using taylor's power law and iwao's patchiness. in addition, a fixed-precision sequential sampling plant was developed for each species on the host plant by green's model at precision levels of 0.25 and 0.1. the results revealed tha ... | 2018 | 29365154 |
| feeding and egg distribution studies of heringia calcarata (diptera: syrphidae), a specialized predator of woolly apple aphid (homoptera: eriosomatidae) in virginia apple orchards. | predation by the aphidophagous syrphid fly heringia calcarata (loew) on woolly apple aphid, eriosoma lanigerum (hausmann), was studied in the laboratory and in virginia apple orchards. feeding studies compared the prey suitability of three temporally sympatric aphid pests of apple: spirea aphid, aphis spiraecola patch; rosy apple aphid, dysaphis plantaginea (passerini); and woolly apple aphid. significantly more h. calcarata larvae survived and completed development on a pure diet of woolly appl ... | 2004 | 15279258 |
| weed host specificity of the aphid, aphis spiraecola: developmental and reproductive performance of aphids in relation to plant growth and leaf chemicals of the siam weed, chromolaena odorata. | density, distribution, and nutritional quality of plants are the causal basis of host plant selection in aphids. nutritional qualities of a plant vary according to its growth stage and also in response to seasonal variation. how host plant growth stages shape aphid performance was studied in aphis spiraecola patch (homoptera: aphididae) on the perennial siam weed, chromolaena odorata (l.) king and robinson (asterales: asteraceae). this plant species is the preferred host in the hot and humid tro ... | 2012 | 22950746 |
| baseline susceptibilities to imidacloprid for green apple aphid and spirea aphid (homoptera: aphididae) collected from apple in the pacific northwest. | susceptibilities to the neonicotinyl insecticide imidacloprid were determined for clones of apple aphid, aphis pomi de geer, and spirea aphid, aphis spiraecola patch, collected from conventional and organic apple orchards and from crab apple and wild apple in washington state and british columbia over a period of 6 yr. for aphids collected during 1996--1998, adults were dipped in test solutions by using the food and agriculture organization protocol, and third instars and adults were reared on t ... | 2005 | 15765682 |
| susceptibilities of apple aphid and spirea aphid collected from apple in the pacific northwest to selected insecticides. | laboratory bioassays using leaf disks of apple dipped in test solutions of insecticides demonstrated that the apple aphid, aphis pomi de geer, and the spirea aphid, aphis spiraecola patch, differed significantly in susceptibility to a number of insecticides registered for control of aphids on apple (malus spp.). compared with a. pomi, a. spiraecola was approximately four- and three-fold less susceptible to pirimicarb and lambda-cyhalothrin, respectively, whereas there was little difference in re ... | 2006 | 16937694 |
| relationship of insecticide tolerance to esterase enzyme activity in aphis pomi and aphis spiraecola (hemiptera: aphididae). | green apple aphid, aphis pomi de geer, and aphis spiraecola patch (both hemiptera: aphididae), are sympatric aphid species that are pests of apples (malus spp.) and other crops. a. spiraecola has been shown to be significantly more tolerant to several insecticides compared with a. pomi. to establish the mechanisms contributing to this difference in insecticide response, clones of both species were collected from british columbia, canada, and washington state. dose-response bioassays were conduct ... | 2010 | 20429451 |
| why the aphid aphis spiraecola is more abundant on clementine tree than aphis gossypii? | aphis spiraecola and aphis gossypii cause harmful damages on clementine tree orchards. weekly surveys measured the abundance of aphids (larvae, winged and wingless adults) as well as of auxiliary insects and parameters of energy metabolism. correlatively, soluble carbohydrates, total free amino acids, free proline and condensed tannins were quantified in control and infested leaves. both aphid species showed parallel temporal variations, but a. spiraecola was consistently more abundant regardles ... | 2014 | 24581807 |
| 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 |
| aphid transmission of the ontario isolate of plum pox virus. | utilization of timed virus acquisition access probes in studies of plum pox virus (ppv) transmission by aphids demonstrated that endemic species transmitted the virus readily from plum, prunus domestica (l.) batsch; peach, p. persica (l.); or dwarf flowering almond, p. glandulosa thunberg., to peach seedlings. the green peach aphid, myzus persicae (sulzer), was shown to be the most efficient vector. acquisition of virus by green peach aphids from infected peach leaves resulted in 18-28% infected ... | 2015 | 26453705 |
| spatial and temporal spread of citrus tristeza virus and its aphid vectors in the north western area of morocco. | first report of citrus tristeza virus (ctv,closterovirus) in morocco datesback to 1961 in collections of citrus varieties. an exhaustive survey of citrus in the north of the country in 2009 revealed that ctv was spread all over the citrus production area. we attempted to evaluate the relative contribution of different aphid species in the spread of ctv disease in a citrus reticulata orchard at the loukkous region during 2 years (2012 and 2013). the overall ctv incidence estimated in the experime ... | 2016 | 25884375 |