Plant parasitic nematodes are recognized today as important pests of grapevines. The root-knot nematodes (Meloidogyne spp.) are the most prevalent of the many types of nematodes existing in California vineyards. Root-knot infestations are widespread in the San Joaquin Valley. They are probably the most important single grape-growing problem of those vineyards on the light sandy soils of this area.
