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https://www.readbyqxmd.com/read/29145627/bacterial-communities-associated-with-the-ectoparasitic-mites-varroa-destructor-and-tropilaelaps-mercedesae-of-honey-bees-apis-mellifera
#1
Chonthicha Pakwan, Martin Kaltenpoth, Benjamin Weiss, Panuwan Chantawannakul, Guo Jun, Terd Disayathanoowat
Varroa and Tropilaelaps mites have been reported as serious ectoparasites of honey bees (Apis mellifera). In this study, bacterial communities associated with Varroa destructor and Tropilaelaps mercedesae from Northern Thailand were determined, using both culture-dependent and culture-independent approaches. Adult female mites were collected from apiaries in Chiang Mai and Lampang provinces. Culturable bacteria were isolated from individual mites. On average, we observed approximately 1340 and 1140 CFU/mite in Varroa and Tropilaelaps, respectively...
November 14, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29125881/chemical-and-cultural-control-of-tropilaelaps-mercedesae-mites-in-honeybee-apis-mellifera-colonies-in-northern-thailand
#2
Jeffery S Pettis, Robyn Rose, Veeranan Chaimanee
At least two parasitic mites have moved from Asian species of honeybees to infest Apis mellifera. Of these two, Varroa destructor is more widespread globally while Tropilaelaps mercedesae has remained largely in Asia. Tropilaelaps mites are most problematic when A. mellifera is managed outside its native range in contact with Asian species of Apis. In areas where this occurs, beekeepers of A. mellifera treat aggressively for Tropilaelaps and Varroa is either outcompeted or is controlled as a result of the aggressive treatment regime used against Tropilaelaps...
2017: PloS One
https://www.readbyqxmd.com/read/29035869/varroa-destructor-induces-changes-in-the-expression-of-immunity-related-genes-during-the-development-of-apis-mellifera-worker-and-drone-broods
#3
Ewa A Zaobidna, Krystyna Żółtowska, Elżbieta Łopieńska-Biernat
The ectoparasitic mite Varroa destructor has emerged as the major pest of honeybees. Despite extensive research efforts, the pathogenesis of varroosis has not been fully explained. Earlier studies suggested that V. destructor infestation leads to the suppression of the host's immune system. The aim of this study was to analyze the immune responses of 14 genes in the Toll signal transduction pathways, including effector genes of antimicrobial peptides (AMPs), in developing Apis mellifera workers and drones infested with V...
December 20, 2017: Acta Parasitologica
https://www.readbyqxmd.com/read/29026097/chemosensing-of-honeybee-parasite-varroa-destructor-transcriptomic-analysis
#4
Nurit Eliash, Nitin K Singh, Starlin Thangarajan, Noa Sela, Dena Leshkowitz, Yosi Kamer, Ilia Zaidman, Ada Rafaeli, Victoria Soroker
Chemosensing is a primary sense in nature, however little is known about its mechanism in Chelicerata. As a model organism we used the mite Varroa destructor, a key parasite of honeybees. Here we describe a transcriptomic analysis of two physiological stages for the Varroa foreleg, the site of primary olfactory organ. The transcriptomic analysis revealed transcripts of chemosensory related genes belonging to several groups. These include Niemann-Pick disease protein, type C2 (NPC2), gustatory receptors (GRs), ionotropic receptors (IRs), sensory neuron membrane proteins (SNMPs) and odorant binding proteins (OBP)...
October 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28973572/a-comparison-of-wolbachia-infection-frequencies-in-varroa-with-prevalence-of-deformed-wing-virus
#5
COMPARATIVE STUDY
Thorben Grau, Annely Brandt, Sara DeLeon, Marina Doris Meixner, Jakob Friedrich Strauß, Gerrit Joop, Arndt Telschow
Wolbachia are widely distributed bacterial endosymbionts of arthropods and filarial nematodes. These bacteria can affect host fitness in a variety of ways, such as protecting hosts against viruses and other pathogens. Here, we investigate the possible role of Wolbachia in the prevalence of the deformed wing virus (DWV), a highly virulent pathogen of honey bees (Apis mellifera) that is transmitted by parasitic Varroa mites (Varroa destructor). About 180 Varroa mites from 18 beehives were tested for infection with Wolbachia and DWV...
May 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28878743/characterization-of-the-copy-number-and-variants-of-deformed-wing-virus-dwv-in-the-pairs-of-honey-bee-pupa-and-infesting-varroa-destructor-or-tropilaelaps-mercedesae
#6
Yunfei Wu, Xiaofeng Dong, Tatsuhiko Kadowaki
Recent honey bee colony losses, particularly during the winter, have been shown to be associated with the presence of both ectoparasitic mites and Deformed Wing Virus (DWV). Whilst the role of Varroa destructor mites as a viral vector is well established, the role of Tropilaelaps mercedesae mites in viral transmission has not been fully investigated. In this study, we tested the effects that V. destructor and T. mercedesae infestation have on fluctuation of the DWV copy number and alteration of the virus variants in honey bees by characterizing individual pupae and their infesting mites...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28867676/a-varroa-destructor-protein-atlas-reveals-molecular-underpinnings-of-developmental-transitions-and-sexual-differentiation
#7
Alison McAfee, Queenie Chan, Jay Evans, Leonard J Foster
Varroa destructor is the most economically damaging honey bee pest, weakening colonies by simultaneously parasitizing bees and transmitting harmful viruses. Despite these impacts on honey bee health, surprisingly little is known about its fundamental molecular biology. Here we present a Varroa protein atlas crossing all major developmental stages (egg, protonymph, deutonymph and adult) for both male and female mites as a web-based interactive tool (http://foster.nce.ubc.ca/varroa/index.html). We used intensity-based label-free quantitation to find 1,433 differentially expressed proteins across developmental stages...
September 3, 2017: Molecular & Cellular Proteomics: MCP
https://www.readbyqxmd.com/read/28834265/association-of-varroa-destructor-females-in-multiply-infested-cells-of-the-honeybee-apis-mellifera
#8
Alexis L Beaurepaire, James D Ellis, Klemens J Krieger, Robin F A Moritz
The genetic diversity of Varroa destructor (Anderson & Trueman) is limited outside its natural range due to population bottlenecks and its propensity to inbreed. In light of the arms race between V. destructor and its honeybee (Apis mellifera L.) host, any mechanism enhancing population admixture of the mite may be favored. One way that admixture can occur is when two genetically dissimilar mites coinvade a brood cell, with the progeny of the foundresses admixing. We determined the relatedness of 393 pairs of V...
August 22, 2017: Insect Science
https://www.readbyqxmd.com/read/28797906/amitraz-and-its-metabolite-modulate-honey-bee-cardiac-function-and-tolerance-to-viral-infection
#9
Scott T O'Neal, Carlyle C Brewster, Jeffrey R Bloomquist, Troy D Anderson
The health and survival of managed honey bee (Apis mellifera) colonies are affected by multiple factors, one of the most important being the interaction between viral pathogens and infestations of the ectoparasitic mite Varroa destructor. Currently, the only effective strategy available for mitigating the impact of viral infections is the chemical control of mite populations. Unfortunately, the use of in-hive acaricides comes at a price, as they can produce sublethal effects that are difficult to quantify, but may ultimately be as damaging as the mites they are used to treat...
August 7, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28795524/resin-foraging-dynamics-in-varroa-destructor-infested-hives-a-case-of-medication-of-kin
#10
Michelina Pusceddu, Giannella Piluzza, Panagiotis Theodorou, Franco Buffa, Luca Ruiu, Simonetta Bullitta, Ignazio Floris, Alberto Satta
Social insects have evolved colony behavioral, physiological and organizational adaptations (social immunity) to reduce the risks of parasitization and/or disease transmission. The collection of resin from various plants and its use in the hive as propolis, is a clear example of behavioral defense. For Apis mellifera, an increased propolis content in the hive may correspond to variations in the microbial load of the colony and to a down-regulation of an individual bee's immune response. However, many aspects of such antimicrobial mechanism still need to be clarified...
August 10, 2017: Insect Science
https://www.readbyqxmd.com/read/28761114/absence-of-deformed-wing-virus-and-varroa-destructor-in-australia-provides-unique-perspectives-on-honeybee-viral-landscapes-and-colony-losses
#11
John M K Roberts, Denis L Anderson, Peter A Durr
Honeybee (Apis mellifera) health is threatened globally by the complex interaction of multiple stressors, including the parasitic mite Varroa destructor and a number of pathogenic viruses. Australia provides a unique opportunity to study this pathogenic viral landscape in the absence of V. destructor. We analysed 1,240A. mellifera colonies across Australia by reverse transcription-polymerase chain reaction (RT-PCR) and next-generation sequencing (NGS). Five viruses were prevalent: black queen cell virus (BQCV), sacbrood virus (SBV), Israeli acute paralysis virus (IAPV) and the Lake Sinai viruses (LSV1 and LSV2), of which the latter three were detected for the first time in Australia...
July 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28752481/complexity-adaptations-and-variations-in-the-secondary-insemination-system-of-female-dermanyssina-mites-acari-anactinothrichida-gamasida-the-case-of-afrocypholaelaps-africana
#12
A Di Palma, O D Seeman, G Alberti
Gamasine mites, mainly of the taxon Dermanyssina, possess a secondarily evolved insemination system (sperm access system), of which there are two, generally recognized, structurally different types, the laelapid- and the phytoseiid-type. The ultrastructure of the female sperm access system in Afrocypholaelaps africana is described. It consists of paired insemination pores, opening between the bases of legs three and four, and paired cuticle-lined tubules that converge into a large, sack-like spermatheca, remarkably cuticle-lined as well...
July 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28748595/genes-important-for-survival-or-reproduction-in-varroa-destructor-identified-by-rnai
#13
Zachary Y Huang, Guowu Bian, Zhiyong Xi, Xianbing Xie
The Varroa mite, (Varroa destructor), is the worst threat to honey bee health worldwide. To explore the possibility of using RNAi to control this pest, we determined the effects of knocking down various genes on Varroa mite survival and reproduction. Double-stranded RNA (dsRNA) of six candidate genes (Da, Pros26S, RpL8, RpL11, RpP0 and RpS13) were synthesized and each injected into Varroa mites, then mite survival and reproduction were assessed. Injection of dsRNA for Da (Daughterless) and Pros26S (Proteasome 26S subunit ATPase) caused a significant reduction in mite survival, with 3...
July 27, 2017: Insect Science
https://www.readbyqxmd.com/read/28748336/continuous-release-of-oregano-oil-effectively-and-safely-controls-varroa-destructor-infestations-in-honey-bee-colonies-in-a-northern-climate
#14
Qodratollah Sabahi, Hanan Gashout, Paul G Kelly, Ernesto Guzman-Novoa
The ectoparasitic mite Varroa destructor is responsible for the death of millions of honey bee (Apis mellifera) colonies worldwide. Testing potential miticide compounds with different delivery methods that effectively control V. destructor and have low toxicity for honey bees is crucial to manage this parasite in hives. We determined the varroacide efficacy of three natural compounds delivered to hives with three application methods over a 4-week period. Oxalic acid in a sucrose solution was applied impregnated in cardboard (T1)...
July 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/28743669/relative-abundance-of-deformed-wing-virus-varroa-destructor-virus-1-and-their-recombinants-in-honey-bees-apis-mellifera-assessed-by-kmer-analysis-of-public-rna-seq-data
#15
Robert Scott Cornman
Deformed wing virus (DWV) is a major pathogen of concern to apiculture, and recent reports have indicated the local predominance and potential virulence of recombinants between DWV and a related virus, Varroa destructor virus 1 (VDV). However, little is known about the frequency and titer of VDV and recombinants relative to DWV generally. In this study, I assessed the relative occurrence and titer of DWV and VDV in public RNA-seq accessions of honey bee using a rapid, kmer-based approach. Three recombinant types were detectable graphically and corroborated by de novo assembly...
October 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28740210/elucidating-the-mechanisms-underlying-the-beneficial-health-effects-of-dietary-pollen-on-honey-bees-apis-mellifera-infested-by-varroa-mite-ectoparasites
#16
Desiderato Annoscia, Virginia Zanni, David Galbraith, Anna Quirici, Christina Grozinger, Renzo Bortolomeazzi, Francesco Nazzi
Parasites and pathogens of the honey bee (Apis mellifera) are key factors underlying colony losses, which are threatening the beekeeping industry and agriculture as a whole. To control the spread and development of pathogen infections within the colony, honey bees use plant resins with antibiotic activity, but little is known about the properties of other substances, that are mainly used as a foodstuff, for controlling possible diseases both at the individual and colony level. In this study, we tested the hypothesis that pollen is beneficial for honey bees challenged with the parasitic mite Varroa destructor associated to the Deformed Wing Virus...
July 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717953/evaluation-of-the-efficacy-and-safety-of-flumethrin-275-mg-bee-hive-strips-polyvar-yellow-%C3%A2-against-varroa-destructor-in-naturally-infested-honey-bee-colonies-in-a-controlled-study
#17
Tjeerd Blacquière, Gertraut Altreuther, Klemens J Krieger
No abstract text is available yet for this article.
August 2017: Parasitology Research
https://www.readbyqxmd.com/read/28686745/protocols-for-the-delivery-of-small-molecules-to-the-two-spotted-spider-mite-tetranychus-urticae
#18
Takeshi Suzuki, María Urizarna España, Maria Andreia Nunes, Vladimir Zhurov, Wannes Dermauw, Masahiro Osakabe, Thomas Van Leeuwen, Miodrag Grbic, Vojislava Grbic
The two-spotted spider mite, Tetranychus urticae, is a chelicerate herbivore with an extremely wide host range and an extraordinary ability to develop pesticide resistance. Due to its responsiveness to natural and synthetic xenobiotics, the spider mite is becoming a prime pest herbivore model for studies of the evolution of host range, plant-herbivore interactions and mechanisms of xenobiotic resistance. The spider mite genome has been sequenced and its transcriptional responses to developmental and various biotic and abiotic cues have been documented...
2017: PloS One
https://www.readbyqxmd.com/read/28686725/persistence-of-subclinical-deformed-wing-virus-infections-in-honeybees-following-varroa-mite-removal-and-a-bee-population-turnover
#19
Barbara Locke, Emilia Semberg, Eva Forsgren, Joachim R de Miranda
Deformed wing virus (DWV) is a lethal virus of honeybees (Apis mellifera) implicated in elevated colony mortality rates worldwide and facilitated through vector transmission by the ectoparasitic mite Varroa destructor. Clinical, symptomatic DWV infections are almost exclusively associated with high virus titres during pupal development, usually acquired through feeding by Varroa mites when reproducing on bee pupae. Control of the mite population, generally through acaricide treatment, is essential for breaking the DWV epidemic and minimizing colony losses...
2017: PloS One
https://www.readbyqxmd.com/read/28684976/use-of-costic-acid-a-natural-extract-from-dittrichia-viscosa-for-the-control-of-varroa-destructor-a-parasite-of-the-european-honey-bee
#20
Kalliopi Sofou, Demosthenis Isaakidis, Apostolos Spyros, Anita Büttner, Athanassios Giannis, Haralambos E Katerinopoulos
Costic acid has been isolated from the plant Dittrichia viscosa and its efficacy against Varroa destructor, a parasite of Apis mellifera, the European honey bee, has been studied. Costic acid exhibited potent in vivo acaricidal activity against the parasite. Initial experiments showed that the compound is not toxic for human umbilical vein endothelial cells (HUVEC) at concentrations of up to 230 micromolar (μM), indicating that costic acid could be used as a safe, low-cost and efficient agent for controlling varroosis in honey bee colonies...
2017: Beilstein Journal of Organic Chemistry
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