Abstract
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 in-oculum 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 cause 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 J2/Kg soil of Meloidogyne in-cognita race 2. The threshold level of root-knot nematode was 1000 J2/kg soil while threshold level of Fusarium was @ 1 g/Kg soil. Inoculum level of Fusarium oxysporum f sp. lycopersici and Meloidogyne in-cognita race-2 was pathogenic and caused significant reduction at and above 1 g/kg soil and 1000 J2/Kg soil respectively.
Highlights
Tomato (Lycopersicon esculentum Mill.) is the most important tropical vegetable crop and is widely used throughout the world
The tomato plant infected by fungus Fusarium was collected from field and brought in laboratory
Lycopersici 0.25 g and 0.50 g/kg soil showed no significant reduction in plant growth parameters viz. Plant length, fresh and dry weight, number of fruits and fruit weight
Summary
Tomato (Lycopersicon esculentum Mill.) is the most important tropical vegetable crop and is widely used throughout the world. It is a native of Andes region of South America. Tomato occupies second position amongst the vegetable crops in terms of production. Lamberti [3] reported that the root-knot nematode cause highest suppression in production of tomato ranging from 10% Taylor [4] to 80% Siddiqi [5]. Reduction in yield due to root-knot nematodes (Meloidogyne spp.) in tomato range from 28% to 68% Adesiyan et al [8] and 40% to 46%, Bhatti and Jain [9], Reddy [10]. The fungus Fusariums oxysporum f sp and lycopersici cause wilt disease in tomato crop
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