Microcalorimetric and Microbiological in Vitro Investigations on the Acaricidal, Insecticidal, and Antimicrobial Effects of Propolis por Assegid Garedew

Microcalorimetric and Microbiological in Vitro Investigations on the Acaricidal, Insecticidal, and Antimicrobial Effects of Propolis por Assegid Garedew

Titulo del libro: Microcalorimetric and Microbiological in Vitro Investigations on the Acaricidal, Insecticidal, and Antimicrobial Effects of Propolis

Autor: Assegid Garedew

Número de páginas: 192 páginas

Fecha de lanzamiento: December 30, 2003

ISBN: 3832504311

Editor: Logos Verlag Berlin GmbH

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Assegid Garedew con Microcalorimetric and Microbiological in Vitro Investigations on the Acaricidal, Insecticidal, and Antimicrobial Effects of Propolis

The ideal conditions in the beehive interior expose the colony to several parasites, pests, and pathogens. Moreover, the high density of individuals in honeybee colonies facilitates the transmission of parasites and pathogens in the hive. Presently, beekeeping with the western honeybee Apis mellifera L. is endangered by the parasitic mite Varroa destructor (Anderson and Trueman). In addition, pests such as Galleria mellonella, and bacterial, fungal, and viral pathogens also remain a common problem. The energy and nutritional demands of the parasitic lifestyle of Varroa mites have been demonstrated in this thesis, for the first time, through mite starvation and calorimetric experiments. The mites suck up to 28% of the non-replenishable reserve food of the capped brood that otherwise would have been consumed by the pupa during metamorphosis. This in turn leads to the emergence of crippled bees, and can be aggravated by viral, bacterial, and fungal infections. The antivarroa action of propolis (bee glue) has been investigated for the first time calorimetrically, respirometrically, and using the Petridish bioassay method. Propolis samples collected from different geographic origins showed Varroa narcotizing and varroacidal effects. The length of narcosis and mortality rate of mites depended on the solvent of extraction (70% or 40% ethanol, or water), concentration of propolis, and contact time. Propolis extracted in 70% ethanol has been found to be highly toxic, resulting in the death of 80% to 100% mites regardless of the contact time and concentration of propolis. The treatment with 40% ethanol-extracted propolis was less effective, followed by the water extracted propolis. The insecticidal action of propolis has been demonstrated by dipping the different larval stages of the greater wax moth Galleria mellonella in ethanol-extracted propolis for 30 s. The treatment with propolis narcotized the larvae, and reduced