Mae tystiolaeth o Wyfyn Ymdeithiwr y Derw (GYD) wedi’i ganfod ar goeden dderwen yng Ngerddi Parc y Rhath yng Nghaerdydd o ganlyniad i archwiliad gan Gyfoeth Naturiol Cymru ar saith coeden dderwen sydd wedi’u plannu o’r newydd.
Evidence of oak processionary moth (OPM) has been found on an oak tree in Roath Park Gardens in Cardiff as a result of proactive inspection by Natural Resources Wales of 7 newly planted oak trees.