Nematodes

Nematodes - Root-knot, dagger and lesion nematodes
Annemiek Schilder, MSU Plant Pathology

Plant-parasitic nematodes are microscopic roundworms that live in soil and feed on plant roots. Aboveground symptoms are poor growth, low yields and an “off” color. The symptoms may resemble those of nutrient deficiencies or virus diseases. Belowground symptoms include poor root development, root browning, root swelling and stunting or death of feeder roots. In new vineyards, nematodes may cause poor establishment and weak growth of young vines. Nematodes seldom kill vines but contribute to a steady decline in vigor. Some nematodes are also vectors of viruses. Nematodes spread with soil and plant roots. Once established in a vineyard, nematode infestations tend to be permanent.


Left, roots with black discoloration caused by dagger nematode. Right, healthy roots.

Additional information

Search MSU Fruit CAT Alert newsletter for articles. Type in keyword: nematodes
MSU Diagnostic Services
Special grape disease problems and controls (from Michigan Fruit Management Guide)

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Funding for this web site provided by Project GREEEN, American Farmland Trust, EPA Region 5's Strategic Agricultural Initiative program, The National Foundation for IPM Education, the Center for Agricultural Partnerships and the MSU Integrated Pest Management Program
in collaboration with MSU Extension and the Michigan Agricultural Experiment Station.
Updated 11/27/07 Contact: J.N. Landis.