Title of Thesis
Screening of tomato cultivars against root knot nematodes and
their biological management
Sajid Aleem Khan
University of Agriculture Faisalabad, Pakistan
|Number of Pages
|Keywords (Extracted from title, table of contents and abstract of thesis)
nematodes plant, incognita
Research was done on two important groups of
nematodes plant parasitic nematodes and insect parasitic nematodes
(entomopathogenic nematodes). Among plant parasitic nematodes root
knot nematodes are the most important. It has a wide host range.
Tomatoes are the most seriously affected by Meloidogyne incognita.
Different varieties were tested against M. incognita for
susceptibility, invasion and development of M. incognita.
Moneymaker, Titano, California, Peelo, Nagina, Riogranade and Pakit
were highly susceptible while Fonto, Tarnab, Lima, VF-400, PETO-86
and Samrutti were susceptible. Calmart VFN proved resistant. There
was a positive relationship between the inoculum level of M.
incognita and root weights and inverse relationship with shoot
weights. Effect of plant age on plant susceptibility to nematode
infection was also studied. Plant extract of neem, onion, garlic,
tobacco, aloevera, cloves and chili was investigated for larval
mortality and egg hatching of M. incognita. Mortality of nematodes
increased with exposure time and extract concentration. Effect of
plant extracts on root knot nematodes applied after root knot
nematodes and bare dip root treatment was also studied on plant
growth parameters plant height, fresh shoot weight, dry shoot weight
and fresh root weight. Among all the plant extracts tested neem
proved effective followed by onion and tobacco while chili proved
less effective as compared to the other plant extracts. In the
second part of thesis, effect of entomopathogenic nematodes S.
asiaticum, S. glaseri, H. indica and H. bacteriophora on the
development of M. incognita, effect of different inoculum levels,
and time of application, live and dead EPN on RKN in addition to the
persistence in soil was also studied. Suppression of M. incognita
varied with application rate. The high application rates of EPN
reduced M. incognita infestation as compared to low rates. Reduction
in root knot nematode invasion and development was recorded. Numbers
of EPN were reduced in non-sterilized soil. Both dead as well as
live entomopathogenic nematodes and their material were responsible
for lower invasion by M. incognita in tomato.