The use of Irish provenance plant material also meets with the Department of Agricultures policies in relation to phytosanitary regulation and management.
For example, the use of Irish provenance plant material avoids the importation of plants of foreign provenance which may carry fungi, bacteria and invertebrate pests. Diseases include Acute Oak Decline (Phytophthora ramorum) which is prevalent in the east, midlands and south of England, with a steadily growing number of suspect sites. These confirmed sites are in the east of England, southern England and the midlands, with a steadily growing number of suspect sites to be confirmed. The disease, thought to be caused by a bacteria, affects both pedunculate and sessile oak and is typified by bleeding stems and areas of dead bark and branches. Die back and death of mature trees follows within a few seasons.