Meloidogyne incognita was studied on damping off (Pythium aphenidermatum) and root rot (Rhizoctonia solani) diseases of tomato (Lycopersicon esculentum, Mill.) under greenhouse conditions. A total of seven treatments, replicated four times were taken up in RBD and the parameters were observed viz. germination percent of tomato at seventh, fourteenth and twenty one days after sowing the seeds, the numbers of galls per root system, root weight, shoot weight, root length and shoot length were taken after sixty days of sowing. Treatments comprised of (control), (P. aphanidermatum), (R. solani), (M. incognita), (M. incognita+P. aphanidermatum), (M. incognita +R.
solani), (M.incognita+P. aphanidermatum+R. solani).The fungal pathogens were inoculated in the pots before sowing. Second stage juveniles of M. incognita @ 1020 ml-1 of suspension was inoculated in the pots at seven days after germination. After seven days of sowing data observed that there was significant reduction in germination percentage of tomato seeds in the treatment T4 as compared with T1. Number of root-knot galls was counted at 60 days old of plants. Data indicated that the effect of individual increase inoculated of T3 significantly the number of root- gall or compared
with combined treatment of T5 and T4, however T5 and T4 were not significant from each other. Root weight of tomato plants at 60 days was recorded to study the interactive effect of M. incognita with R. solani and P. aphanidarmatum. Data revealed that T1, T4, T6 significantly reduced the root weight of tomato from other treatments. Shoot weight of tomato
at 60 days with M. incognita inoculation significant reduction as compared with other treatments.