Mae pathogen tebyg i ffwng sy'n effeithio ar amrywiol rywogaethau coed wedi'i ddarganfod ar Ystâd Goed Llywodraeth Cymru yng Nghoedwig Dyfi, Gwynedd.
A fungal-like pathogen known to affect a variety of tree species has been discovered on the Welsh Government Woodland Estate in Dyfi Forest, Gwynedd.