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Thread: Small Hive Beetle update

  1. #71
    Administrator gavin's Avatar
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    News reached my inbox (thanks Fi) of this crucial paper:

    http://link.springer.com/article/10....592-016-0465-3

    Apidologia

    Introduction of Aethina tumida (Coleoptera: Nitidulidae) in the regions of Calabria and Sicily (southern Italy)

    Anna GRANATO and colleagues including Franco MUTINELLI

    Abstract – Aethina tumida (small hive beetle, SHB) was first detected in September 2014 in Calabria region, southern Italy, and in a single apiary in Sicily in November 2014. In September 2015, SHB was again recorded in Calabria, and in 2016, only sentinel honey bee nucleus colonies were found to be infested. Its phylogenetic relationship and possible origin were investigated comparing the cox1 sequences with the corresponding region available in the GenBank database. The neighbour-joining method revealed that the first Italian specimen belonged to a group also containing an African specimen from Cameroon. The Italian specimens differ from the SHBs spread worldwide and are split into two different groups: group B1 includes the AfricCam3 sequence and the first SHB identified in Calabria; group B2 includes specimens from Calabria and the only one from Sicily which share identical cox1 sequences. SHB in Italy appears to have been introduced from Africa and includes independent or contemporary incursions in the two concerned regions. The most likely scenario is that SHB was introduced into Calabria followed by man-mediated migration to Sicily.

    That seems crystal clear then, the SHB plaguing Calabria came directly from Africa and was not of the type that has been spreading worldwide.

  2. #72
    Senior Member Greengage's Avatar
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    well done its good to read propor data instead of the scare mongering.

  3. #73
    Senior Member fatshark's Avatar
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    A further 30 or so apiaries have been reported with SHB since mid-September. This is more than were reported in total in 2015 (when detection occurred between mid-September and early December) so we can perhaps expect more before the end of the year. All again in the Calabria region.

  4. #74
    Senior Member prakel's Avatar
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    Quote Originally Posted by fatshark View Post
    A further 30 or so apiaries have been reported with SHB since mid-September. This is more than were reported in total in 2015 (when detection occurred between mid-September and early December) so we can perhaps expect more before the end of the year. All again in the Calabria region.
    Do you know if there's a pattern which suggests a clear natural expansion outwards from the earlier cases?

  5. #75
    Administrator gavin's Avatar
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    Quote Originally Posted by prakel View Post
    Do you know if there's a pattern which suggests a clear natural expansion outwards from the earlier cases?
    There is one case this year (so far) away from the previous area (but within beetle flying distance) and more cases in a previously sparse area to the east. Other than that the affected area is pretty much the same. There was talk of the beetle being well established before the big excitement in Sep 2014 so it seems it did a lot of its spreading by then. It seems likely that the eradication attempt isn't eradicating it but it could be slowing the spread.

    The maps are here: http://www.izsvenezie.com/aethina-tumida-in-italy/

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