Mae'r ardal newydd wedi'i chreu i amddiffyn y cymunedau yn y Canolbarth y mae'r pathogen wedi'u taro rhag effeithiau cymdeithasol, economaidd ac amgylcheddol sylweddol.
The new zone has been introduced to prevent significant wider social, economic and environmental impacts to local communities in Mid Wales affected by the increased spread of the pathogen.