The ash dieback tree disease was confirmed at a further six Northern Ireland sites, the Agriculture Minister said on 27 November 2012.
It brings the total number of confirmed sites to 11.
Chalara ash dieback, caused by the fungus Chalara fraxinea, was found in imported ash saplings in five sites over counties Down and Antrim at the beginning of November 2012.
National Trust land at Runkerry on the north coast was one area affected.
Minister Michelle O'Neill was making a statement to the Assembly on a recent North South Ministerial Council (NSMC) meeting.
She said ministers in Northern Ireland and in the Irish Republic had a co-ordinated approach to the outbreak.
Mrs O'Neill said 4,500 ash saplings had already been destroyed and said all the confirmed sites had been recently planted and had come from the one importation
She added compensation had not been discussed at the meeting.