Mae’n edrych yn debyg mai dau ddull sydd o ledaenu’r clefyd, sef trwy blanhigion heintiedig a thrwy ei gario gan y gwynt.  O ganlyniad, rydym yn canolbwyntio ar gael hyd i safleoedd lle mae coed ynn sydd wedi’u mewnforio wedi’u plannu er mwyn cael hyd i unrhyw safleoedd heintiedig.  Gan nad yw’n debygol mai trwy’r gwynt y cyrhaeddodd y sborau y safle heintiedig yn Sir Gâr, rydym yn canolbwyntio felly ar ddarganfod tarddiad coed y safle hwnnw.  Y gobaith yw cwblhau’r agwedd hon ar y gwaith o fewn yr wythnos nesaf.
As the disease appears to have two main vectors enabling it to spread, through infected plants and being windborne further work is focussed on tracing the location of sites where imported ash trees have been planted in order to identify any further infected sites. As it is unlikely that the disease at the infected site in Wales was caused by wind-blown spores the focus of this further survey is on the trace back of planting sites which we expect to complete within the next week.