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
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
No Thumbnail Available
Date
1987-05
Authors
CHINDO, PAUL SULE
Journal Title
Journal ISSN
Volume Title
Publisher
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.
Description
A thesis submitted to the Postgraduate School,
Ahmadu Bello University in partial fulfillment
of the requirements for the Degree of Master
of Science in Crop Protection
DEPARTMENT OF CROP PROTECTION
FACULTY OF AGRICULTURE
AHMADU BELLO UNIVERSITY
ZARIA, NIGERIA MAY 1987
Keywords
STUDIES,, HOST-PARASITE,, RELATIONSHIPS,, ROOT-KNOT,, NEMATODE,, (MELOIDOGYNE INCOGNITA), (KOFOID WHITE, 1919), CHITWOOD, 1949,, TOMATO,, (LYCOPERSICON ESCULBNTUM MILL.), NORTHERN,, NIGERIAN.