STUDIES ON HOST-PARASITE RELATIONSHIPS BETWEEN THE ROOT-KNOT NEMATODE (MELOIDOGYNE INCOGNITA) (KOFOID AND WHITE, 1919) CHITWOOD, 1949, AND TOMATO (LYCOPERSICON ESCULBNTUM MILL.) IN NORTHERN NIGERIA

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STUDIES ON HOST-PARASITE RELATIONSHIPS BETWEEN THE ROOT-KNOT NEMATODE (MELOIDOGYNE INCOGNITA) (KOFOID AND WHITE, 1919) CHITWOOD, 1949, AND TOMATO (LYCOPERSICON ESCULBNTUM MILL.) IN NORTHERN NIGERIA

ABSTRACT

Although a lot of investigations in Nigeria have shown that it pays to control root-knot nematodes, the economic justification for doing so in tomato production has not been well documented. It is against this background that the concept of economic loss threshold was adopted, Based on this investigation, it was established that a population of between 1000 to 2000 larvae/kg of soil of Meloidagyne incognita (Kofoid and White Chitwoed, 1949 was capable of causing economic loss. The estimated economic loss threshold was based on the average market value of the tomato crop during the two experimental years, 1 984 and 1985, and the cost of control. The root-knot nematode, M. incognita was found to increase the severity of two vascular diseases (fusarium and bacterial wilt) of susceptible tomato cultivars. Severity was highest when the nematode was inoculated simultaneously with the vascular pathogens. Vascular discolouration was observed when cultivars resistant to the vascular pathogens were inoculated with M. incognita and vascular pathogens. Wilting was not observed in treatments which were inoculated with the vascular pathogens alone except for slight discolouration in tomato cv. CL-119-1-2-0-0. Investigations with poultry manure showed that it is very effective in controlling the root-knot nematodes. An optimum level for both nematode control and plant growth appears to be around 4- t/ha.

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