not my words but I was reading this earlier, would be nice to see the actual reports following the genetic testing.
Many experienced beekeepers in the 1920s and later, for example in the pages of the British Bee Journal, challenged the views that IOW disease was caused by acarine and that it caused extinction of any race of bees. L.E.Snelgrove commented in 1946, "... many writers have expressed the view that bees of pure British origin cannot now be found. The writer does not hold this view. Apart from the fact that he has continuously found British bees in certain country districts showing no sign of crossing with foreign races, the laws of heredity conflict with the supposition that a pure race can be eliminated by crossing alone. In 1936 sanctions were imposed on Italy by the British Government and the importation of queens from that country diminished from that time and ceased during the war. For some years, too, the importation of other races, Carniolans, Caucasians, etc., has been discontinued. The Italian element, as shown by colouring, is steadily disappearing and many of our bees are becoming dark and indistinguishable from the old British bees." (See below.)
The Isle of Wight phenomenon was thoroughly debunked on a scientific basis by Dr.Leslie Bailey of Rothamsted in 1981. According to Beowulf Cooper, founder of BIBBA, "Some of those personally involved in the restocking campaign have admitted that there was in fact no shortage of surviving native bees." And yet as Norman Carreck has recently written, "half a century after the explanation was found to be scientifically unsound, many beekeeping books and articles still perpetuate the myth the the IOW disease was caused by the tracheal mite Acarapis woodi "; a prominent example being H.R.C.Riches, President of the Central Association of Beekeepers and past President of the British Beekeepers Association in 1992. Even today similar claims are commonly made. However, in the last decade DNA studies by Pedersen and others in Denmark and elsewhere have conclusively shown that modern specimens of Dark Bees from the UK and Ireland fit into the genetic specification of Apis mellifera mellifera