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A Population of Meloidogyne javanica in Spain Virulent to the Mi Resistance Gene in Tomato

March 2001 , Volume 85 , Number  3
Pages  271 - 276

C. Ornat , S. Verdejo-Lucas , Departament Protecció Vegetal. IRTA. Crta. de Cabrils s/n. 08348 Cabrils, Barcelona, Spain , and F. J. Sorribas , Departament d'Agronomia. ESAB. Comte d'Urgell, 197, 08036 Barcelona

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Accepted for publication 11 November 2000.

A population of Meloidogyne javanica virulent to Mi-gene in tomato was identified in Spain. It reproduced similarly on resistant and susceptible tomato cultivars in the greenhouse, microplots, and in the field. In monoxenic cultures, reproduction of the virulent M. javanica was higher than that of an avirulent population on resistant but not on susceptible tomatoes. The virulent population suppressed tomato yield of both resistant and susceptible tomatoes by 29% in microplots. Initial population density (Pi) was inversely correlated with Pf (final population density)/Pi on both resistant and susceptible tomatoes in the field. A negative correlation was found between Pi and tomato yield for the susceptible but not for the resistant cultivar.

Additional keywords: Lycopersicon esculentum, reproductive potential, root-knot nematode, susceptibility, yield loss

© 2001 The American Phytopathological Society