Anton Imdorf

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The consumption of high-quality pollen induces the development of the hypopharyngeal glands in young honey bee workers. As protein-rich secretions from these glands are an important component of larval food, a direct relationship between pollen supply and brood rearing can be suspected. Consequently, the availability of pollen is likely to be a central(More)
Since 1999, the incidence of European foulbrood (EFB) in Switzerland has been rising constantly. To understand the reason for this increase, an epidemiological study of the efficacy of sanitation measures was carried out. Workers from brood nests and flight entrances at infected apiaries were collected from colonies with and without clinical symptoms in(More)
A sensitive hemi-nested polymerase chain reaction (PCR) was used for detection of Melissococcus plutonius, the causative agent of European foulbrood (EFB). Sampling was made in Switzerland, where EFB is a widespread disease and incidences have increased in recent years. Larvae from brood samples with and without clinical signs of disease (n = 92) and honey(More)
To explore alternative strategies to synthetic insecticides for control of Aethina tumida, the small hive beetle (SHB), treatments already established against two other honeybee pests, Varroa destructor and Galleria mellonella, were investigated. In the laboratory, eggs, larvae, and adults of SHB were treated with thymol (10, 20, and 50 mg) or with organic(More)
In Switzerland, the incidence of European foulbrood (EFB), caused by the Gram-positive bacterium Melissococcus plutonius, has increased dramatically between 1997 and 2005 but the epidemiology, including the transmission of M. plutonius, remains poorly understood. In this study, the distribution of M. plutonius among bees originating from apiaries and(More)
Formic acid and oxalic acid field trials for control of Varroa destructor were carried out in autumn according to the Swiss prescriptions during three successive years in different apiaries in Switzerland. The following parameters were determined in honey that was harvested the year after treatment: formic acid, oxalic acid and free acidity. The following(More)
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