Varroa sensitive hygiene

About: Varroa sensitive hygiene is a research topic. Over the lifetime, 714 publications have been published within this topic receiving 24928 citations. The topic is also known as: VSH.

Epidemiological Study in Varoosis and in other Bees Brood Pathogens in Western Romania

Abstract: Samples of adult bees (Apis mellifera) and bees brood collected from 31 apiaries in western Romania have been examined for diagnosis in varroasis and in bees brood infectious and contagious diseases: ascosferosis, aspergillosis, European foulbrood and American foulbrood. For this study were used rapid immunoassay tests and microscopic examination. Varroa destructor mite was identified in all apiaries, 72% of adult bee samples and 96% of the samples of bees brood was infested. Ascosferosis was identified in 10% of the samples of bees brood and American foulbrood only 2% of the bees brood samples. No cases of aspergillosis and European foulbrood were identified during the study.

Reproductive Biology of Varroa jacobsoni Oud. in Worker and Drone Brood of the Honey Bee Apis mellifera L. under Michigan Conditions

Abstract: Reproductive biology of the mite Varroa jacobsoni Oud. was studied under Michigan conditions in Apis mellifera L. colonies. A total of 353 sealed worker brood cells containing 697 mother mites and 192 sealed drone brood cells containing 498 mother mites were found in 959 sealed worker brood cells and 344 sealed drone brood cells that were examined. Number of offspring were calculated using two different methods, the first one included adult females that either did not produce offspring, or produced only male and dead offspring. While the second method included mother mites producing only live female offspring. It was found that the mean number of females offspring reaching maturity before the bee emerged in worker and drone cells containing a single mother mite are 1.41 and 2.47 offspring, respectively (First method). When the nonreproducing and male only reproducing females (second method) were excluded the mean number increased to 1.82 for workers and 2.69 for drones. In case of the infestation with more than one adult female, the average number of offspring remained 1.09 for workers and 1.87 for drones (First method). These increased to 1.26 and 2.03, respectively, when non-reproducing and male only reproducing mother mites were excluded (Second method. This study found that 86.75 and 93% of the mites were fertile in worker and drone cells, respectively, when including those mother mites that produced male only offspring. Whereas excluding these offspring, the fertility decreased to 82 and 90% in worker and drone cells, respectively. The results also showed that the percentage of non-reproducing females was 11 and 7% in worker and drone cells, respectively. While the mortality percentage of mother mites was recorded 2.29 and 2.7% in worker and drone brood cells, respectively.