Showing papers on "Varroa sensitive hygiene published in 1985"

The influence of the mite varroa jacobsoni oud. on the protein concentration and the haemolymph volume of the brood of worker bees and drones of the honey bee apis mellifera l

Abstract: Protein concentrations in the haemolymph of non-infected and varroa-infected worker and drone brood were examined by a photometric method. The determination of the haemolymph volume was carried out by the [14C] dnulin dilution method. The results of these two measurements were used to calculate the total protein content in the haemolymph of the worker and drone pupae (brown eyes). The findings showed that the worker and the drone brood react differently to varroa infestation.

Beeswax preparations for controlling parasites of honey bees

Abstract: Bee colonies which are infested by the mite Varroa jacobsoni are inevitably killed unless the keeper takes measures. The mortality rate of Varroa jacobsoni which can be achieved by controlling Varroa jacobsoni in the conventional fashion by spraying, misting, dusting or fumigating with acaricides in the beehive is 80-90%, but, and this is decisive for the incompleteness of the disinfection - this does not affect the Varroa progeny in the sealed cells containing the developing bees. According to the invention, the acaricide is incorporated into the central wall of the honeycomb, a thin beeswax sheet which is imprinted with a cell pattern and which is added to by the bees to make the complete honeycomb. Varroa infestation can now be eradicated completely; this applies in particular to the Varroa progeny in the sealed cells. When central walls are used which contain the acaricide isopropyl 4,4'-dibromobenzilate (bromopropylate), a bee colony which is parasitised by Varroa jacobsoni will be completely free from mites after 8 weeks.