What should I do about ash trees that are infected with ash dieback but are subject of a Tree Preservation Order (TPO) or are in a conservation area? -
Beth ddylwn ei wneud am goed ynn a heintiwyd â chlefyd coed ynn ond sy’n destun Gorchymyn Diogelu Coed (TPO) neu sydd mewn ardal gadwraeth? -