Nematodes are microscopic roundworms. Some species have become parasitic pests of grapevines in Australia. Although they are difficult to detect and there is not a clear solution to the problem of nematode infestations, routine monitoring and careful consideration of vineyard practices, especially when planting new vines, can help reduce yield losses. Nematode infestation is verified by analysis of soil samples by a specialist laboratory. The risk of yield loss from nematodes is determined by the number of nematodes found in a soil sample of a given size. This page provides links to resources on nematodes.