Wales V argentina rugby matches, the Millennium Stadium in Cardiff had problems with the playing surface in Wales' game against Samoa.
The Welsh Rugby hospitality has announced that the Millennium Stadium pitch will be replaced before the final two autumn internationals 2009 against Argentina and Australia.
The pitch at the Cardiff venue cut up badly during Wales's 19-12 defeat by New Zealand last weekend and independent consultants were brought in to examine the turf.
They found it had been contaminated by a Bibionidae fly infestation, which causes damage to root growth and surface grass coverage.
The stadium manager, Gerry Toms, said: "We have decided to avoid any risk of the infestation causing further erosion by replacing the surface now. Obviously our concern was how much damage might take place between now and the Australia match at the end of November.
"The pitch for the game against Samoa was not to the standard we require which, combined with the unknown factor of the potential erosion over the next two weeks, has prompted us to act now."