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Tall Fescue ‘Jesup (Max-Q)’: Meloidogyne incognita Development in Roots and Nematotoxicity

Meyer, Susan L. F., Nyczepir, Andrew P., Rupprecht, Shannon M., Mitchell, Ashaki D., Martin, Phyllis A. W., Brush, Craig W., Chitwood, David J., Vinyard, Bryan T.
Agronomy journal 2013 v.105 no.3 pp. 755
Festuca arundinacea subsp. arundinacea, Meloidogyne incognita, Neotyphodium coenophialum, Prunus persica, Solanum, biological control, cultivars, egg masses, eggs, ergot alkaloids, females, fescue toxicosis, fungi, galls, greenhouses, ground cover plants, juveniles, mortality, nematicidal properties, nematode control, peaches, root exudates, root-knot nematodes, roots, shoots, tomatoes, trees, viability
Tall fescue [ (Schreb.) Dumont. cv. Jesup (Max-Q)] was recently recommended as a preplant ground cover for managing plant–parasitic nematodes on peach trees [ (L.) Batsch] in the southeastern United States. Jesup (Max-Q) is associated with a strain of the endosymbiotic fungus that does not produce ergot alkaloids that cause fescue toxicosis. To optimize use of this tall fescue for lowering populations of the root-knot nematode , greenhouse and laboratory studies were conducted on selected factors potentially contributing to suppression. Tall fescue–derived extracts and exudates were tested for nematotoxicity, and life cycle development was compared between susceptible tomato (Mill.) and Jesup (Max-Q) roots. The highest tested root and shoot extract concentrations inhibited hatch up to 46% compared with controls, and were nematotoxic to the infective second-stage juveniles (J2; up to 66% decrease in viability). Root exudates were nematotoxic to J2 (up to 27% mortality), and inhibited hatch up to 48%. Roots of susceptible tomato plants (controls) had approximately 3 to 7 times more infective J2 than tall fescue roots, 40 to 80 times more females and egg masses, >1800 times more eggs/plant, and 10 to 83 times more galls/plant. The nature of Jesup (Max-Q) suppression of included low J2 penetration rate and failure of infective J2 to complete their life cycle in this cultivar. Compounds derived from Jesup (Max-Q) tall fescue decreased nematode viability, also contributing to suppression by this plant.