Chapter 22

Managing Nematodes in Vineyards

(book excerpts)

Nematodes are microscopic, unsegmented roundworms present in most soils that feed on vine roots. Nematodes are a major economic problem in every major grape production region in the world. Plant-parasitic nematodes can cause direct and indirect damage to a vine. Nematode feeding can cause direct damage by stopping root elongation, killing plant tissue, changing root growth patterns, and by removing plant nutrients. Their feeding patterns fall into two categories: some feed externally on roots (ectoparasitic nematodes), while some penetrate into roots and feed internally (endoparasitic nematodes). Indirectly, plant-parasitic nematodes can damage plants by vectoring viruses or by increasing the severity of other plant diseases, such as Pythium, Fusarium, Rhizoctonia, and Phytophthora. Nematodes like other pests take advantage of vines that are under stress as a result of management practices and/or other biological pressure.  

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Within This Chapter: Managing Nematodes in Vineyards