2008/684/EC: Commission Decision of 19 August 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) 4407)