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https://www.readbyqxmd.com/read/28178181/inside-honeybee-hives-impact-of-natural-propolis-on-the-ectoparasitic-mite-varroa-destructor-and-viruses
#1
Nora Drescher, Alexandra-Maria Klein, Peter Neumann, Orlando Yañez, Sara D Leonhardt
Social immunity is a key factor for honeybee health, including behavioral defense strategies such as the collective use of antimicrobial plant resins (propolis). While laboratory data repeatedly show significant propolis effects, field data are scarce, especially at the colony level. Here, we investigated whether propolis, as naturally deposited in the nests, can protect honeybees against ectoparasitic mites Varroa destructor and associated viruses, which are currently considered the most serious biological threat to European honeybee subspecies, Apis mellifera, globally...
February 6, 2017: Insects
https://www.readbyqxmd.com/read/28168846/performance-of-honey-bee-colonies-under-a-long-lasting-dietary-exposure-to-sub-lethal-concentrations-of-the-neonicotinoid-insecticide-thiacloprid
#2
Reinhold Siede, Lena Faust, Marina D Meixner, Christian Maus, Bernd Grünewald, Ralph Büchler
BACKGROUND: Substantial honey bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sub-lethal concentrations of pesticides has been suggested to affect the performance of honey bee colonies. This study aims to elucidate the potential effects of a chronic exposure to sub-lethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to honey bee colonies in a three-year replicated colony feeding study...
February 7, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28158303/field-efficacy-of-acaricides-against-varroa-destructor
#3
María Jesús Gracia, Carlos Moreno, Montserrat Ferrer, Alfredo Sanz, Miguel Ángel Peribáñez, Rosa Estrada
Field trials were conducted in Northeast Spain (Aragón) to evaluate the effectiveness of two acaricides against Varroa destructor. These experiments took into account the season of the year, apiary, colony, and developmental state and strength of the colony. The acaricides used were a synthetic (amitraz, Apivar®) and a natural (formulated from Api Life Var®, thymol oil and thymol alcohol) product. The treatments used in the present study reduce high infestations of V. destructor, although they do not eliminate the infestation...
2017: PloS One
https://www.readbyqxmd.com/read/28154949/differential-gene-expression-associated-with-honey-bee-grooming-behavior-in-response-to-varroa-mites
#4
Mollah Md Hamiduzzaman, Berna Emsen, Greg J Hunt, Subhashree Subramanyam, Christie E Williams, Jennifer M Tsuruda, Ernesto Guzman-Novoa
Honey bee (Apis mellifera) grooming behavior is an important mechanism of resistance against the parasitic mite Varroa destructor. This research was conducted to study associations between grooming behavior and the expression of selected immune, neural, detoxification, developmental and health-related genes. Individual bees tested in a laboratory assay for various levels of grooming behavior in response to V. destructor were also analyzed for gene expression. Intense groomers (IG) were most efficient in that they needed significantly less time to start grooming and fewer grooming attempts to successfully remove mites from their bodies than did light groomers (LG)...
February 3, 2017: Behavior Genetics
https://www.readbyqxmd.com/read/28122251/early-life-stress-affects-mortality-rate-more-than-social-behavior-gene-expression-or-oxidative-damage-in-honey-bee-workers
#5
Olav Rueppell, Babak Yousefi, Juan Collazo, Daniel Smith
Early life stressors can affect aging and life expectancy in positive or negative ways. Individuals can adjust their behavior and molecular physiology based on early life experiences but relatively few studies have connected such mechanisms to demographic patterns in social organisms. Sociality buffers individuals from environmental influences and it is unclear how much early life stress affects later life history. Workers of the honey bee (Apis mellifera L.) were exposed to two stressors, Varroa parasitism and Paraquat exposure, early in life...
January 22, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/28120868/evidence-for-positive-selection-and-recombination-hotspots-in-deformed-wing-virus-dwv
#6
A Dalmon, C Desbiez, M Coulon, M Thomasson, Y Le Conte, C Alaux, J Vallon, B Moury
Deformed wing virus (DWV) is considered one of the most damaging pests in honey bees since the spread of its vector, Varroa destructor. In this study, we sequenced the whole genomes of two virus isolates and studied the evolutionary forces that act on DWV genomes. The isolate from a Varroa-tolerant bee colony was characterized by three recombination breakpoints between DWV and the closely related Varroa destructor virus-1 (VDV-1), whereas the variant from the colony using conventional Varroa management was similar to the originally described DWV...
January 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28095337/environment-or-beekeeping-management-what-explains-better-the-prevalence-of-honey-bee-colonies-with-high-levels-of-varroa-destructor
#7
Agostina Giacobino, Adriana Pacini, Ana Molineri, N Bulacio Cagnolo, J Merke, E Orellano, E Bertozzi, G Masciangelo, H Pietronave, M Signorini
Varroa destructor is one of the major threats to honey bee colonies. The mite abundance in the colonies is affected by environmental conditions as well as by beekeeping management. The aim of this study was to recognize the main drivers associated with autumn V. destructor infestation in honey bee colonies when different regions from Argentina are compared. A total of 361 colonies distributed in five Argentinean eco-regions were examined to evaluate Varroa mite infestation rate during autumn and Nosema sp. presence...
January 6, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28081188/effect-of-varroa-destructor-wounding-and-varroa-homogenate-on-gene-expression-in-brood-and-adult-honey-bees
#8
Gun Koleoglu, Paul H Goodwin, Mariana Reyes-Quintana, Mollah Md Hamiduzzaman, Ernesto Guzman-Novoa
Honey bee (Apis mellifera) gene expression related to immunity for hymenoptaecin (AmHym) and defensin-1 (AmDef-1), longevity for vitellogenin (AmVit2) and stem cell proliferation for poly U binding factor 68 kDa (AmPuf68) was compared following Varroa destructor parasitism, buffer injection and injection of V. destructor compounds in its homogenate. In adults, V. destructor parasitism decreased expression of all four genes, while buffer injection decreased expression of AmHym, AmPuf68 and AmVit2, and homogenate injection decreased expression of AmPuf68 and AmVit2 but increased expression of AmDef-1 relative to their respective controls...
2017: PloS One
https://www.readbyqxmd.com/read/28032102/evaluation-of-oxalic-acid-treatments-against-the-mite-varroa-destructor-and-secondary-effects-on-honey-bees-apis-mellifera
#9
Noureddine Adjlane, El-Ounass Tarek, Nizar Haddad
BACKGROUND: The Varroa destructor varroasis is a very serious parasite of honeybee Apis mellifera. The objective of this study was to evaluate the effectiveness of Varroa treatment using organic acid (oxalic acid) in Algeria identifying its side effects on bee colonies. METHODS: Treatment was conducted in one apiary consisting 30 colonies kept in Langstroth hives kind. Oxalic acid dripped directly on bees 5ml of this solution of oxalic acid per lane occupied by a syringe...
December 2016: Journal of Arthropod-borne Diseases
https://www.readbyqxmd.com/read/28028168/acute-exposure-to-worst-case-concentrations-of-amitraz-does-not-affect-honey-bee-learning-short-term-memory-or-hemolymph-octopamine-levels
#10
Rachel R Rix, G Christopher Cutler
Amitraz, an acaricide used to treat Varroa destructor Anderson & Trueman, is one of the most commonly detected pesticides in honey bee (Apis mellifera L.) hives. Acaricides sometimes negatively impact honey bee cognition, but potential effects of amitraz on honey bee learning have been rarely studied. We topically exposed foragers to 95th percentile field-relevant levels of amitraz and, 24 h later, tested the ability of bees to associate a sucrose reward with a conditioned odor (learning response) using the proboscis extension response (PER)...
December 27, 2016: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28006002/unbiased-rna-shotgun-metagenomics-in-social-and-solitary-wild-bees-detects-associations-with-eukaryote-parasites-and-new-viruses
#11
Karel Schoonvaere, Lina De Smet, Guy Smagghe, Andy Vierstraete, Bart P Braeckman, Dirk C de Graaf
The diversity of eukaryote organisms and viruses associated with wild bees remains poorly characterized in contrast to the well-documented pathosphere of the western honey bee, Apis mellifera. Using a deliberate RNA shotgun metagenomic sequencing strategy in combination with a dedicated bioinformatics workflow, we identified the (micro-)organisms and viruses associated with two bumble bee hosts, Bombus terrestris and Bombus pascuorum, and two solitary bee hosts, Osmia cornuta and Andrena vaga. Ion Torrent semiconductor sequencing generated approximately 3...
2016: PloS One
https://www.readbyqxmd.com/read/28002470/sepsis-and-hemocyte-loss-in-honey-bees-apis-mellifera-infected-with-serratia-marcescens-strain-sicaria
#12
Nancy L Burritt, Nicole J Foss, Eric C Neeno-Eckwall, James O Church, Anna M Hilger, Jacob A Hildebrand, David M Warshauer, Nicole T Perna, James B Burritt
Global loss of honey bee colonies is threatening the human food supply. Diverse pathogens reduce honey bee hardiness needed to sustain colonies, especially in winter. We isolated a free-living Gram negative bacillus from hemolymph of worker honey bees (Apis mellifera) found separated from winter clusters. In some hives, greater than 90% of the dying bees detached from the winter cluster were found to contain this bacterium in their hemolymph. Throughout the year, the same organism was rarely found in bees engaged in normal hive activities, but was detected in about half of Varroa destructor mites obtained from colonies that housed the septic bees...
2016: PloS One
https://www.readbyqxmd.com/read/27942015/varroa-destructor-mites-can-nimbly-climb-from-flowers-onto-foraging-honey-bees
#13
David T Peck, Michael L Smith, Thomas D Seeley
Varroa destructor, the introduced parasite of European honey bees associated with massive colony deaths, spreads readily through populations of honey bee colonies, both managed colonies living crowded together in apiaries and wild colonies living widely dispersed in natural settings. Mites are hypothesized to spread between most managed colonies via phoretically riding forager bees when they engage in robbing colonies or they drift between hives. However, widely spaced wild colonies show Varroa infestation despite limited opportunities for robbing and little or no drifting of bees between colonies...
2016: PloS One
https://www.readbyqxmd.com/read/27886770/multiresidue-method-for-trace-pesticide-analysis-in-honeybee-wax-comb-by-gc-qqq-ms
#14
M D Gil García, S Uclés Duque, A B Lozano Fernández, A Sosa, A R Fernández-Alba
The aim of this analytical study is to develop an improved multi-residue methodology of high sensitivity and expanded scope for pesticide residue analysis in honeybee wax combs. The method was validated for 160 pesticide residues (including acaricides, insecticides, fungicides and herbicides) gas chromatography amenable and covering a wide variety of polarity and chemical structure. This method of analysis applied gas chromatography coupled to a triple quadrupole mass spectrometer for the quantitative analysis of pesticide residues...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27883042/two-novel-viruses-associated-with-the-apis-mellifera-pathogenic-mite-varroa-destructor
#15
Sofia Levin, Noa Sela, Nor Chejanovsky
Varroa destructor infestation of Apis mellifera colonies carries and/or promotes replication of honey bee viruses like the Deformed wing virus, the Varroa destructor virus-1, the Acute bee paralysis virus, the Israeli acute bee paralysis virus and the Kashmir bee virus that have been well described and characterized; but viruses exclusively associated with Varroa were not found. To look for viruses that may associate with- or infect V. destructor we performed deep sequencing (RNA-seq) of RNA extracted from honey bees and mites in Varroa-infested untreated colonies...
November 24, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27852845/honey-bee-deformed-wing-virus-structures-reveal-that-conformational-changes-accompany-genome-release
#16
Lindsey J Organtini, Kristin L Shingler, Robert E Ashley, Elizabeth A Capaldi, Kulsoom Durrani, Kelly A Dryden, Alexander M Makhov, James F Conway, Marie C Pizzorno, Susan Hafenstein
: The picornavirus-like deformed wing virus (DWV) has been directly linked to colony collapse; however, little is known about the mechanisms of host attachment or entry for DWV or its molecular and structural details. Here we report the three-dimensional (3-D) structures of DWV capsids isolated from infected honey bees, including the immature procapsid, the genome-filled virion, the putative entry intermediate (A-particle), and the empty capsid that remains after genome release. The capsids are decorated by large spikes around the 5-fold vertices...
January 15, 2017: Journal of Virology
https://www.readbyqxmd.com/read/27852222/differential-gene-expression-in-varroa-jacobsoni-mites-following-a-host-shift-to-european-honey-bees-apis-mellifera
#17
Gladys K Andino, Michael Gribskov, Denis L Anderson, Jay D Evans, Greg J Hunt
BACKGROUND: Varroa mites are widely considered the biggest honey bee health problem worldwide. Until recently, Varroa jacobsoni has been found to live and reproduce only in Asian honey bee (Apis cerana) colonies, while V. destructor successfully reproduces in both A. cerana and A. mellifera colonies. However, we have identified an island population of V. jacobsoni that is highly destructive to A. mellifera, the primary species used for pollination and honey production. The ability of these populations of mites to cross the host species boundary potentially represents an enormous threat to apiculture, and is presumably due to genetic variation that exists among populations of V...
November 16, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27829027/effect-of-1-3-1-6-%C3%AE-glucan-on-natural-and-experimental-deformed-wing-virus-infection-in-newly-emerged-honeybees-apis-mellifera-ligustica
#18
Maurizio Mazzei, Baldassare Fronte, Simona Sagona, Maria Luisa Carrozza, Mario Forzan, Federica Pizzurro, Carlo Bibbiani, Vincenzo Miragliotta, Francesca Abramo, Francesca Millanta, Marco Bagliacca, Alessandro Poli, Antonio Felicioli
The Western Honeybee is a key pollinator for natural as well as agricultural ecosystems. In the last decade massive honeybee colony losses have been observed worldwide, the result of a complex syndrome triggered by multiple stress factors, with the RNA virus Deformed Wing Virus (DWV) and the mite Varroa destructor playing crucial roles. The mite supports replication of DWV to high titers, which exert an immunosuppressive action and correlate with the onset of the disease. The aim of this study was to investigate the effect of 1,3-1,6 β-glucan, a natural innate immune system modulator, on honeybee response to low-titer natural and high-titer experimental DWV infection...
2016: PloS One
https://www.readbyqxmd.com/read/27812229/fine-scale-population-genetic-structure-of-varroa-destructor-an-ectoparasitic-mite-of-the-honey-bee-apis-mellifera
#19
Travis L Dynes, Jacobus C De Roode, Justine I Lyons, Jennifer A Berry, Keith S Delaplane, Berry J Brosi
Varroa destructor is an obligate ectoparasitic mite and the most important biotic threat currently facing honey bees (Apis mellifera). We used neutral microsatellites to analyze previously unreported fine scale population structure of V. destructor, a species characterized by extreme lack of genetic diversity owing to multiple bottleneck events, haplodiploidy, and primarily brother-sister matings. Our results surprisingly indicate that detectable hierarchical genetic variation exists between apiaries, between colonies within an apiary, and even within colonies...
2016: Apidologie
https://www.readbyqxmd.com/read/27812228/distance-between-honey-bee-apis-mellifera-colonies-regulates-populations-of-varroa-destructor-at-a-landscape-scale
#20
Maxcy P Nolan, Keith S Delaplane
Inter-colony distance of Apis mellifera significantly affects colony numbers of the parasitic mite Varroa destructor. We set up 15 apiaries, each consisting of two colonies. Each apiary pair was assigned an inter-colony distance of 0, 10, or 100 m. Colonies were rendered nearly mite-free, then one colony in each pair was seeded with 300 female mites (mite-donor colony), while the other remained uninoculated (mite-recipient colony). After four months of monitoring, a whole model analysis showed that apiaries in which colonies were spaced 100 m apart contained lower average mite numbers than 0 m or 10 m apiaries...
2016: Apidologie
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