Pwrpas yr offeryn hwn yw diogelu bioddiogelwch a chefnogi masnach rhwng Prydain Fawr a thrydydd gwledydd drwy gyflwyno mesurau amddiffynnol yn erbyn plâu planhigion risg uchel. O fewn yr ardal sydd wedi’i dynodi ar gyfer Gwyfyn Ymdeithiwr y Derw, ni chaniateir symud coed derw risg uchel oni bai bod gweithredwyr proffesiynol yn cydymffurfio ag amodau bioddiogelwch ac amodau symud rhagnodedig. Mae’r OS hwn yn gwahardd symud coed derw risg uchel i unrhyw ardal y tu allan i’r ardal sydd wedi’i dynodi.
The purpose of this instrument is to protect biosecurity and support trade between Great Britain (“GB”) and third countries by introducing protective measures against high-risk pests of plants. Within the demarcated area for Oak Processionary Moth, the movement of high-risk oak trees will only be permitted if professional operators comply with prescribed biosecurity and movement conditions. This SI prohibits the movement of high-risk oak trees to any area outside of the demarcated area.