Search for, and Development of, Nematode Resistance in Grape Rootstocks

This year we have focused our attention on sources of resistance to the ring nematode. Criconemoides xenoplax; and to obtaining a broader genetic base for resistance to root-knot (Meloidogyne spp) and dagger nematode (Xiphinema index). We have also initiated and are repeating trials to find resistance to the citrus nematode, Tylenchulus semipenetrans, and the root-lesion nematode, Pratylenchus vulnus.