2008/954/EC: Commission Decision of 15 December 2008 amending Decision 2006/133/EC requiring Member States temporarily to take additional measures against the dissemination of Bursaphelenchus xylophilus (Steiner et Buhrer) Nickle et al . (the pine wood nematode) as regards areas in Portugal, other than those in which it is known not to occur (notified under document number C(2008) 8298)