Many species of soil-inhabiting fungus Fusarium, cause severe yield loss in many crops. Experiments were conducted in net house condition with complete randomized block design to determine the individual effect of different inoculum levels of root-knot nematode, Meloidogyne incognita, Race-2 and Fusarium oxysporum f sp. lycopersici on plant growth parameters viz., Plant length, fresh and dry weight and number of fruits of tomato var. P21. The experimental results showed that both the pathogens

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... ause significant reduction in plant growth parameters. However, the fungus was not much effective on plant growth parameters in comparison to root-knot nematode. Greatest reduction in plant growth parameters was recorded in plants inoculated with 8000 J 2 /kg soil of Meloidogyne incognita race 2. The threshold level of root-knot nematode was 1000 J 2 /kg soil while threshold level of Fusarium was @ 1 g/kg soil. Inoculum level of Fusarium oxysporum f sp. lycopersici and Meloidogyne incognita race-2 was pathogenic and caused significant reduction at and above 1 g/kg soil and 1000 J 2 /kg soil respectively. Keywords: Fusarium oxysporum f sp. lycopersici; Meloidogyne incognita Race-2; Tomato and Threshold Level Isolation and Incubation of Fungus The tomato plant infected by fungus Fusarium was collected from field and brought in laboratory. Fusarium