نتایج جستجو برای: varroa

تعداد نتایج: 1070  

2014
Eugene V. Ryabov Graham R. Wood Jessica M. Fannon Jonathan D. Moore James C. Bull Dave Chandler Andrew Mead Nigel Burroughs David J. Evans

The globally distributed ectoparasite Varroa destructor is a vector for viral pathogens of the Western honeybee (Apis mellifera), in particular the Iflavirus Deformed Wing Virus (DWV). In the absence of Varroa low levels DWV occur, generally causing asymptomatic infections. Conversely, Varroa-infested colonies show markedly elevated virus levels, increased overwintering colony losses, with impa...

Journal: :Journal of invertebrate pathology 2010
Peter Rosenkranz Pia Aumeier Bettina Ziegelmann

The ectoparasitic honey bee mite Varroa destructor was originally confined to the Eastern honey bee Apis cerana. After a shift to the new host Apis mellifera during the first half of the last century, the parasite dispersed world wide and is currently considered the major threat for apiculture. The damage caused by Varroosis is thought to be a crucial driver for the periodical colony losses in ...

2014
Fanny Mondet Joachim R. de Miranda Andre Kretzschmar Yves Le Conte Alison R. Mercer

Over the past fifty years, annual honeybee (Apis mellifera) colony losses have been steadily increasing worldwide. These losses have occurred in parallel with the global spread of the honeybee parasite Varroa destructor. Indeed, Varroa mite infestations are considered to be a key explanatory factor for the widespread increase in annual honeybee colony mortality. The host-parasite relationship b...

2011
M. F. Abdel-Rahman S. H. Rateb

The present investigation was carried out in the apiary at Al-Fath location, Assiut Governorate, Upper Egypt, from 8 th of December, 2007 to 3 rd of January, 2008. The aim of this study was to determine the effectiveness of lemon juice on varroa mites, Varroa destructor (Anderson and Trueman) in honeybee colonies, Apis mellifera L. with little brood in order to reduce varroa population to toler...

2014
H. F. Abou-Shaara

The Varroa mite has many deleterious impacts on honey bee colonies. These impacts are well known and include, for example, the weakness of honey bees by feeding on the haemolymph (Rosenkranz et al. 2010), transportation of viruses to host bees including Kashmir bee virus (Chen et al. 2004), suppresses the immunity of honey bees (Shen et al. 2005), impact bee wing Shape (Cakmak et al. 2011) and ...

2012
Katherine A. Aronstein Eduardo Saldivar Rodrigo Vega Stephanie Westmiller Angela E. Douglas

We investigated the effect of the parasitic mite Varroa destructor on the immunological and nutritional condition of honey bees, Apis mellifera, from the perspective of the individual bee and the colony. Pupae, newly-emerged adults and foraging adults were sampled from honey bee colonies at one site in S. Texas, USA. Varroa‑infested bees displayed elevated titer of Deformed Wing Virus (DWV), su...

2012
ZACHARY HUANG

The varroa mite (Varroa destructor Anderson and Trueman) is an ecto-parasite of the Western honey bee (Apis mellifera) and is distributed worldwide. Because A. mellifera colonies almost always die within two to three years after mite infestation, if not treated, feral bee colonies (unmanaged colonies in the wild) in U.S. were almost totally wiped out by this mite around 1995, less than a decade...

2015
Joachim R. de Miranda R. Scott Cornman Jay D. Evans Emilia Semberg Nizar Haddad Peter Neumann Laurent Gauthier Elke Genersch Sebastian Gisder

Around 14 distinct virus species-complexes have been detected in honeybees, each with one or more strains or sub-species. Here we present the initial characterization of an entirely new virus species-complex discovered in honeybee (Apis mellifera L.) and varroa mite (Varroa destructor) samples from Europe and the USA. The virus has a naturally poly-adenylated RNA genome of about 6500 nucleotide...

2014
Elliud Muli Harland Patch Maryann Frazier James Frazier Baldwyn Torto Tracey Baumgarten Joseph Kilonzo James Ng'ang'a Kimani Fiona Mumoki Daniel Masiga James Tumlinson Christina Grozinger

In East Africa, honey bees (Apis mellifera) provide critical pollination services and income for small-holder farmers and rural families. While honey bee populations in North America and Europe are in decline, little is known about the status of honey bee populations in Africa. We initiated a nationwide survey encompassing 24 locations across Kenya in 2010 to evaluate the numbers and sizes of h...

2014
Nurit Eliash Nitin Kumar Singh Yosef Kamer Govardhana Reddy Pinnelli Erika Plettner Victoria Soroker Olav Rueppell

BACKGROUND The ectoparasitic mite, Varroa destructor, is considered to be one of the most significant threats to apiculture around the world. Chemical cues are known to play a significant role in the host-finding behavior of Varroa. The mites distinguish between bees from different task groups, and prefer nurses over foragers. We examined the possibility of disrupting the Varroa--honey bee inte...

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