Hi,
 
We only have to remember that Varroa Jacobsoni was spread to the west by
the  introduction  of Apis Mellifera into (and return from) the far east
to understand the potential seriousness of species introduction.   There
are many non-beekeeping examples.
 
--
Gordon Scott    [log in to unmask]         100332,3310 on CompuServe
Newsletter      [log in to unmask]      ditto
                Beekeeper, Kendo Sandan, sometime sailor.
                Basingstoke, Hampshire, RG22 5HP, UK