Showing papers on "Varroa sensitive hygiene published in 1996"
TL;DR: The kinds of damage found on Varroa jacobsoni located in worker brood, on adult honey bees, on the bottom board (floorboard) traps and in Gary traps, were investigated in Apis mellifera ligustica colonies.
Abstract: SUMMARYThe kinds of damage found on Varroa jacobsoni located in worker brood, on adult honey bees, on the bottom board (floorboard) traps and in Gary traps, were investigated in Apis mellifera ligustica colonies. Light-coloured adult mites with damage to the cuticle of the idiosoma were found in the brood cells: 2.8% from undamaged mother mites and 17.9% from damaged mother mites. No mites with leg damage were found on adult honey bees. Mites in Gary traps showed more damage (45.9%) than those collected on the bottom boards (26.1 %).
30 citations
TL;DR: It is suggested that hygienic behavioural morphs exist in Australia's commercial bee strains, and it is unnecessary to obtain breeding stock from overseas for this reason alone.
Abstract: Chalkbrood of honey bees (Apis mellifera) is caused by Ascosphaera apis, and is new to Australia. As yet, no treatment or prophylaxis is available for this disease. The best prospects for control are likely to come from the use of 'hygienic' bees, those with a strong genetic tendency to uncap and remove dead pupae, together with good beekeeping practice. Ten strains of Australian commercial honey bee were evaluated for hygienic behaviour. Dead pupae were inserted into the colonies and checked after 3, 5 and 7 days for the number of pupae removed. Most colonies (80%) were non-hygienic and hence likely to be susceptible to chalkbrood. However, 2 strains provided good overall performance in the test and comprised 1 or 2 colonies that were highly hygienic. Colonies were evaluated 3 times, and the good performance of these colonies was repeatable across trials. These data suggest that hygienic behavioural morphs exist in Australia's commercial bee strains, and it is unnecessary to obtain breeding stock from overseas for this reason alone. Selective breeding, with relatively simple techniques which can be used by beekeepers and queen breeders, should produce suitable genotypes.
28 citations
TL;DR: The results suggest that the bioassay is useful for assessing honey bee resistance to A. woodi and suggest that lower percentages of resistant bees than of susceptible bees routinely became infested by foundress mites.
Abstract: Non-infested, young adult honey bees (Apis mellifera L.) of two stocks were exposed to tracheal mites (Acarapis woodi (Rennie)) in infested colonies to determine how divergent levels of susceptibility in host bees differentially affect components of the mite life history. Test bees were retrieved after exposure and dissected to determine whether resistance is founded on the reduced success of gravid female (foundress) mites to enter the host tracheae, on the suppressed reproduction by foundress mites once established in host tracheae or on both. Cohorts of 30–60 bees from each of ten resistant colonies and eight susceptible colonies were tested in eight trials (three to five colonies per stock per trial) having exposure durations of 4, 9 or 21 days. The principal results were that lower percentages of resistant bees than of susceptible bees routinely became infested by foundress mites, individual infested susceptible bees often had more foundress mites than individual infested resistant bees did and mite fecundity was similar in both host types. The infestation percentage results corresponded well with similar results from a prior field test of these stocks and, thus, suggest that the bioassay is useful for assessing honey bee resistance to A. woodi.
18 citations
TL;DR: Two species of Varroa mites were found on the A nuluensis worker bees: two Varro a jacobsoni Oudemans and one that looked similar to VarroA underwoodi Delfinado-Baker and Aggarwal, which was tightly tucked in between the sternites of its host A nulusensis worker bee.
Abstract: ana Fabricius, we found two species of Varroa mites on the A nuluensis worker bees: two Varroa jacobsoni Oudemans and one that looked similar to Varroa underwoodi Delfinado-Baker and Aggarwal, which was tightly tucked in between the sternites of its host A nuluensis worker bee. The mixed colony was obtained by introducing brood combs and adult bees from one colony of A nuluensis collected from the high mountains of Sabah, Malaysia in Borneo into a queenless A cerana colony located 200 km away from the collection site.
11 citations
Dissertation•
06 Dec 1996
TL;DR: It appears that the frequency of mite feeding on adult bees at this time is low, suggesting that probably the mite feeds only for maintenance and survival rather than for infestation, which is a common mechanism for the transmission of mites.
Abstract: approved: D. Michael Burg Aspects concerning the bionomics of the parasitic honey bee brood mite, Varroa jacobsoni Oudemans were investigated. Mite mortality is great during the winter season when the host colony is not rearing brood, appearing to be independent of the mortality of its host. In winter period, no significant association between the number of dead mites and the number of dead adult workers was observed. It appears that the mites are dying by factors other than the host death. Drifting drones facilitate the horizontal transmission of Varroa jacobsoni mites between colonies, especially in modern beekeeping in which managed colonies are kept similarly hived and close together. A great tendency of drones to drift among colonies was observed. A significant correlation was found in the rate of mites per drones and the number of drones in the colonies. It was concluded that the transmission of Varroa jacobsoni among colonies via drifting drones is a common mechanism for the transmission of mites. Redacted for Privacy The relationship between mite load and the size of the honey bee brood host was investigated. The data showed significant statistical differences between the infestation rate of the mite that is, number of female mites per infested pupae and the size of the worker brood nest of its host. With a high number of worker cells in the colony, the mite load is lowered. Feeding activities of V. jacobsoni causes a great impact on A. mellifera colony survival not only through physical damage caused by this mite but also through transmission of various entomopathogenic agents responsible for the outbreak of secondary diseases in the colony. I concluded that mites fed on adult bees during summer time. It appears that the frequency of mite feeding on adult bees at this time is low, suggesting that probably the mite feeds only for maintenance and survival rather than for
1 citations