My thanks to Nick Wallingford for alzheimers relief.  It was indeed an
issue of Tom Sanford's APIS which contained the reference to TM
resistence in Argentina, and the article also included timely discussion
of concerns over importation and shipment of bee stock around the
world, like say from China to Nicaragua, as was discussed rather
heatedly in the past week or so.  Excerpts are included here.
 
             Florida Extension Beekeeping Newsletter
             Apis--Apicultural Information and Issues
                  Volume 8, Number 6, June 1990
 
      Copyright (c) 1990 M.T. Sanford "All Rights Reserved"
 
                 STOCK INTRODUCTION INTO FLORIDA
 
   "... This concept (importations of honey bees) is debatable.
   An interesting situation has arisen in Argentina, presumably
   due  to  importation  of a large quantity of queens from the
   U.S. American foulbrood, previously unknown in that country,
   is now epidemic.  In addition, for some  reason  it  doesn't
   appear  to  respond  to treatment from Terramycin (R) at the
   same dosages used in the US.  Levels of up to 1200 mg active
   material must be used as opposed to the 200  mg  recommended
   in  the  U.S.   This has proven disastrous for beekeeping in
   certain regions of the country.  The reason the queens  were
   brought  to Argentina was simple economics -- they cost less
   to import because the value of the U.S. dollar was low.  Al-
   though regulations exist in the country to prevent introduc-
   tion, this shipment was somehow cleared through customs.
 
   This Argentinian case and others (many  previously  believed
   that  introduction of tracheal mites into the U.S. was not a
   serious threat to bee colonies) reveal  why  there  has  and
   will  continue  to be controversy over importation. Although
   most persons agree that stock introduction is needed in some
   cases, there is a great deal of concern  about  the  methods
   involved. Unfortunately, no guidelines exist ... (and) there
   continues to be no standard importation criteria that can be
   followed for subsequent introductions...."
 
Aaron Morris - I think, but don't remember well.