International audienceVarroa destructor is a parasitic mite of the Asian honey bee, Apis cerana. Owing to host range expansion, it now plagues Apis mellifera, the world's principal crop pollinator and honey producer. Evidence from A. mellifera in far-eastern Russia, Primorsky (P) originating from honey bees imported in the mid 1800's, suggested that many colonies were resistant to V. destructor. A controlled field study of the development of populations of V. destructor shows that P colonies have a strong, genetically based resistance to the parasite. As control colonies (D) were dying with infestations of ca. 10000 mites, P colonies were surviving with infestations of ca. 4000 mites. Several characteristics of the P bees contributed to suppressing the number of mites parasitizing their colonies
-Honey bees from the Primorsky region of far-eastern Russia were evaluated for their resistance to Acarapis woodi. Results from a field test in Louisiana showed that Primorsky honey bees showed strong resistance to tracheal mites. The Primorsky honey bees maintained nearly mite-free colonies throughout the experiment while the domestic stocks were ultimately parasitized by high levels of tracheal mites.Acarapis woodi / tracheal mite / resistance/ Varroa destructor / far-eastern Russia / Primorsky region
Summary — The relative tolerance of four honey bee stocks to Varroa jacobsoni Oudemans was investigated in field conditions. Apis mellifera carnica from Yugoslavia (ARS-Y-C-1), A m carnica from Canada (Hastings), F 1 hybrids from ARS-Y-C-1 and Hastings crosses, and a commercial Louisiana stock of yellow honey bees were studied. All three Carniolan stocks exhibited greater tolerance to V jacobsoni than the Louisiana stock. The Carniolan stocks survived longer with higher levels of Varroa infestation on both worker pupae and adult honey bees. Louisiana stock was more susceptible to Varroa infestation. Colonies died earlier. But, unlike other stocks, the Louisiana stock had lower levels of infestation at death. Regardless of the stock, Varroa had similar reproductive success based on the number of mites per infested pupa (1-10 mites), the number of foundress Varroa per infested pupa (1-3 females), the number of progeny per female (0-5 progeny), the number of progeny per infested pupa (0-7 progeny), and the proportion of infested pupae containing infertile foundresses (0-47%).
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