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Root-knot nematode (Meloidogyne javanica) management should be partly based  on the knowledge of the threshold density, and this value is likely to vary  depending on the resistance level of the tomato cultivars. The damage  functions based on four initial population densities (Pi) (0, 1,000, 3,000  and 5,000 egg kg-1 of soil) of root-knot nematode were determined in four  tomato cultivars. The experiment was performed in completely randomized  design with four replications. The results showed that yield responses to Pi  were fitted properly by a log-logistic function with three parameters. The  most susceptible cultivar was ‘Rutgers’ based on EP50 and EP10 (effective  population of nematodes, reducing 50% or 10% of maximum yield or shoot fresh  weight respectively) and three others were relatively resistant. EP10 is more  applicable than EP50 because 50% yield reduction is unacceptable in most  situations. EP10 for yield of ‘Rutgers’, ‘Efialto’, ‘Falat 111’, ‘Gina VF’  was 500, 3,021, 2,998, and 3,000 egg kg-1 of soil, respectively. The  correlation coefficients among gall index, egg mass and reproductive factors  were positively related. Reproduction factor and root gall indices were  greater in ‘Rutgers’ than in the other cultivars (P≤0.05). For ‘Gina VF’ as a  relatively resistant cultivar it seemed that increasing of Pi up to 5,000 or  more egg kg-1 soil might break its resistance

Determining of root-knot nematode (Meloidogyne javanica) damage function for tomato cultivars